CN114166658A - Method for testing shearing characteristic of vertical interface between waste tire and soil - Google Patents
Method for testing shearing characteristic of vertical interface between waste tire and soil Download PDFInfo
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- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2203/02—Details not specific for a particular testing method
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Abstract
本申请公开了一种废旧轮胎‑土竖直界面剪切特性测试方法，首先依次安装好伺服控制系统、试样系统、围压加载系统和数据采集系统，在废旧轮胎内充填土样Ⅱ，然后将废旧轮胎安装在推拉作动杆上，使其水平中心线及中心轴线均与环形剪切箱重合，在环形剪切箱内由外至内依次环设围压气囊和土样Ⅰ，土样Ⅰ的径向内侧面与废旧轮胎的外侧面接触，最后通过围压气囊和顶部螺旋圆盘分别为废旧轮胎‑土竖直界面提供水平方向及竖直方向的荷载，启动液压伺服电机向推拉作动杆施加应力进行剪切试验，根据不同荷载条件下获得的应力数据计算剪切力学参数。本申请方法适用于对不同埋深及尺寸条件下的废旧轮胎‑土竖直界面进行剪切试验。
The present application discloses a method for testing the shear characteristics of waste tire-soil vertical interface. First, a servo control system, a sample system, a confining pressure loading system and a data acquisition system are installed in sequence, soil samples II are filled in the waste tire, and then Install the waste tire on the push-pull actuating rod, so that its horizontal center line and center axis are coincident with the annular shear box, and in the annular shear box from the outside to the inside, the confining pressure airbag and soil sample I are arranged in turn. The radial inner side of I is in contact with the outer side of the waste tire. Finally, the confining pressure air bag and the top spiral disc provide horizontal and vertical loads for the vertical interface of the waste tire and soil respectively, and the hydraulic servo motor is activated to push and pull. The shear test was carried out by applying stress to the moving rod, and the shear mechanical parameters were calculated according to the stress data obtained under different load conditions. The method of the present application is suitable for shear tests on the vertical interface of waste tires-soil under different burial depths and sizes.
Description
Technical Field
The invention relates to the technical field of reinforced engineering, in particular to a method for testing the shearing property of a waste tire-soil vertical interface.
Background
In recent years, with the continuous increase of automobile output, the number of discarded waste tires is also increased dramatically year by year, a large amount of waste tires not only occupy the land, but also pollute the natural environment, and serious environmental protection problems can be brought to the improper treatment of the waste tires, thus harming the health of surrounding residents. Therefore, how to recycle the waste tires scientifically, environmentally, economically, safely and efficiently is a great practical problem to be solved urgently. At present, waste tires have the characteristics of good durability, circumferential tensile property, tread friction resistance and the like, and are applied to reinforced earth engineering such as reinforced rock-soil slopes, retaining walls, embankments, soft foundations and the like. The shear mechanical behavior of the rib-soil interface is one of the core mechanisms of reinforced soil engineering, so the measurement of the shear mechanical property of the waste tire-soil interface is crucial to master the reinforcing mechanism and performance of the waste tire reinforced soil.
Generally, in order to exert the reinforcing benefit of the waste tires on rock soil to the maximum extent, the waste tire reinforced soil is formed by horizontally arranging the tires and then embedding the tires into an underground soil layer, and considering the shape of the tires, the interaction interface of the waste tires and the soil has both a horizontal interface and a vertical interface, wherein the vertical interface occupies most of the area of the waste tire-soil interface, and the vertical interface is a cylindrical curved surface and is not beneficial to the determination of the shearing mechanical property of the interface. At present, mechanical testing devices for the whole waste tire reinforced soil and a waste tire-soil interface are few, and a shearing test is mostly carried out by intercepting a local tire piece, so that the difference from the practical application condition is large, and the shearing mechanical property of the whole waste tire-soil cylinder cannot be reflected.
Some researchers further develop a mechanical testing device which can relate to the whole tire interface, but because the device is limited in function, the device can only realize the shear test of a horizontal interface, not only can not realize the shear test of a vertical interface, but also can not realize the test of the influence of horizontal soil pressure on the mechanical characteristics of the rib-soil vertical interface with different burial depths, and meanwhile, the device can not be suitable for the mechanical property test of the interfaces with different specifications and sizes (such as the diameter of the tire, the height of the tire tread and the like).
Therefore, a new scheme for testing the shearing property of the junked tire-soil interface is urgently needed in the industry to solve the technical problems.
Disclosure of Invention
The application aims to provide a method for testing the shearing characteristic of a waste tire-soil vertical interface, which meets the test requirements on the shearing characteristic of the waste tire-soil vertical interface with different specifications and different burial depths. The technical scheme of the application is as follows:
a method for testing shearing characteristics of a waste tire-soil vertical interface comprises the following steps:
step S1, installing a servo control system: the push-pull actuating rod is vertically arranged on the push-pull actuator and is connected with the push-pull actuator and the hydraulic servo motor;
step S2, installing a sample system and an annular shearing box: fixedly arranging an annular shear box on a reaction frame, placing a waste tire on a base of an actuating table, arranging a soil sample II in the waste tire, placing a top cover of the actuating table on the waste tire, and fixedly installing an assembled sample system on a push-pull actuating rod to enable the waste tire and the annular shear box to share a central axis;
step S3, debugging the height of the sample system: starting a push-pull actuator, and driving a sample system to vertically move through a push-pull actuating rod to enable horizontal center lines of the waste tires and the annular shearing box to coincide;
step S4, installing a confining pressure loading system: a confining pressure air bag and a soil sample I are sequentially arranged in the annular shearing box from outside to inside along the radial direction in a surrounding manner, the confining pressure air bag is externally connected with an air pump, a pressure gauge is arranged on a connecting air path, and the radial inner side surface of the soil sample I is in contact with the outer side surface of the waste tire;
step S5, applying an anisotropic load: applying pressure to the top cover of the actuating table according to the simulated burial depth to provide vertical load for a vertical interface of the waste tire and the soil, and inflating the confining pressure air bag to provide horizontal load for the vertical interface of the waste tire and the soil;
step S6, shear test: and a displacement meter is installed, a stress sensor is installed on the push-pull actuating rod, a hydraulic servo motor is started to apply stress to the push-pull actuating rod for a shearing experiment, and shearing stress and shearing displacement data are measured through the stress sensor and the displacement meter respectively.
In some specific embodiments, in step S2, circular holes for passing through the push-pull actuation rod are formed in the center positions of the actuation platform base and the actuation platform top cover; the process of installing the sample system specifically includes:
the actuating table base is placed on the horizontal ground, the lower end of a rod-shaped object with the same diameter as that of the push-pull actuating rod is inserted into a circular hole in the center of the actuating table base, the waste tire is horizontally placed on the actuating table base, soil is uniformly stirred in the waste tire and is tamped into a soil sample II according to a layered filling mode, the actuating table top cover is placed on the upper surface of the waste tire, and the upper end of the rod-shaped object is correspondingly inserted into the circular hole in the center of the actuating table top cover.
In some embodiments, in step S2, the sample system is fixedly mounted on the push-pull actuating rod through a bottom spiral disk, and the outer surface of the push-pull actuating rod is provided with threads; the process of installing the sample system further comprises:
and rotatably installing a bottom spiral disc on the push-pull actuating rod, hoisting the assembled sample system and horizontally moving the sample system to a target position to enable the rod-shaped object to coincide with the central axis of the push-pull actuating rod, lowering the sample system, inserting the push-pull actuating rod into the soil sample II from bottom to top and ejecting the rod-shaped object until the base of the actuating platform is attached to the bottom spiral disc.
In some specific embodiments, in step S3, the process of adjusting the height of the sample system specifically includes:
starting a push-pull actuator, driving a sample system to vertically move to a target position through a push-pull actuating rod, enabling the distance between the horizontal center lines of the waste tires and the annular shearing box to be not more than 10cm, and rotating a bottom spiral disc to finely adjust the position of the sample system until the horizontal center lines of the waste tires and the annular shearing box are completely overlapped.
In some specific embodiments, in step S4, the process of installing the confining pressure loading system specifically includes:
horizontal detachable annular base plates are respectively arranged on the upper inner wall and the lower inner wall of the annular shearing box, so that the radial inner ends of the base plates are in contact with the outer side surface of the waste tire, and the radial outer ends of the base plates are in contact with the side wall of the shearing box of the annular shearing box; firstly, placing a confining pressure air bag into a cavity space enclosed by a base plate and the side wall of a shearing box, then opening an air pump to pre-inflate the confining pressure air bag to enable the confining pressure air bag to expand and be tightly attached to the inner wall of the cavity, and finally stirring the soil uniformly and tamping the soil in the residual space of the cavity according to a layered filling mode to obtain a soil sample I.
In some specific embodiments, the step S2 further includes a step of uniformly applying a lubricant on the surface of the stick to form a lubricant layer, and the step S4 further includes a step of uniformly applying a lubricant on the inner wall of the cavity to form a lubricant layer.
In some specific embodiments, in step S5, applying pressure to the table top cover by disposing a top spiral disk above the table top cover; the process of applying the isotropic load specifically includes:
and the top spiral disc is rotatably installed on the push-pull actuating rod, the position of the top cover of the actuating platform is fixed from top to bottom, corresponding vertical load is applied, the air pump is started, and the confining pressure air bag is inflated and expanded to apply corresponding horizontal load.
In some specific embodiments, in step S6, the process of the shearing experiment specifically includes:
the method comprises the steps of starting a hydraulic servo motor to push a push-pull actuating rod to carry out a shear test, measuring the reading of a stress sensor and a displacement meter, transmitting and recording the measured shear stress and shear displacement data to a computer in real time, unloading confining pressure through an air pump, unloading all samples, unloading stress through the hydraulic servo motor, finally changing the confining pressure applied by a confining pressure air bag, and repeating the shear test to obtain the stress and displacement data under the corresponding confining pressure condition.
In some specific embodiments, in step S6, the process of the shearing experiment further includes: the magnitude of the vertical load applied in step S5 was varied to simulate different depths of burial and the shear experiment was repeated.
In some specific embodiments, in step S1, a circulating oil path is provided between the hydraulic servo motor and the push-pull actuator; in the step S6, by driving hydraulic oil to circularly flow between the hydraulic servo motor and the push-pull actuator, a circularly changing vertical stress is applied to the push-pull actuator rod, thereby realizing a circular reciprocating shear test on a vertical interface between the waste tire and the soil.
The technical scheme provided by the application has at least the following beneficial effects:
1. the application provides a method for testing the shearing property of a waste tire-soil vertical interface, which provides a vertical load for the waste tire-soil vertical interface by applying pressure to an actuating table top cover and provides a horizontal load for the waste tire-soil vertical interface by inflating a confining pressure air bag, so that the method overcomes the defect that the traditional rib-soil interface shearing test method can only test the shearing mechanical property of the horizontal interface, and fills the blank in the prior art.
2. In the method, the load in the vertical direction can be adjusted by rotating the top spiral disc, so that different burial depth conditions are simulated, and the test requirements on the shearing characteristics of the waste tire-soil vertical interface with different burial depths during measuring the horizontal soil pressure are met.
3. The method further comprises the process of replacing the base plate with the matched size in the annular shearing box before the sample system is installed, the process of sequentially placing the actuating table base, the waste tire and the actuating table top cover when the sample system is installed, and the process of finely adjusting the height of the sample system by utilizing the bottom spiral disc, so that the waste tire with any axis and radial size can be subjected to shearing experiments by adopting the method, the limitation on the size and the shape of the shearing box in the traditional rib-soil interface mechanical characteristic testing method is broken through, and the test purpose of measuring the shearing characteristic of the waste tire-soil vertical interface under multiple scales is realized.
4. When the method is used for carrying out a shearing experiment, the process of applying the circularly changed vertical stress to the push-pull actuating rod can be further included, and the purpose of researching a circular reciprocating shearing characteristic test of a waste tire-soil vertical interface is achieved.
5. The method adopts a layered tamping mode when filling the soil sample, thereby not only ensuring the integrity of the sample in the experimental process, but also having the characteristic of strong operability; according to the method, the friction force between the soil sample I and the confining pressure air bag and the inner wall surface is reduced by arranging the lubricating layer.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that other drawings may be derived from those drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for testing shear characteristics of a junked tire-soil vertical interface in an embodiment of the present application;
FIG. 2 is a cross-sectional view of the apparatus used in the method for testing shear characteristics of a vertical interface between a used tire and soil according to the embodiment of the present application (tire diameter is small);
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a cross-sectional view of another example of the shear behavior test method for a junked tire-soil vertical interface according to the embodiment of the present disclosure (with a larger tire diameter);
in the figure: 1. the air pump, 2, the manometer, 3, the confined pressure gasbag, 4, soil sample I, 5, the lubricant film, 6, the reaction frame, 7, annular shear box, 8, the shear box top cap, 9, junked tire, 10, soil sample II, 11, actuate the platform base, 12, bottom spiral disc, 13, actuate the platform top cap, 14, top spiral disc, 15, the displacement gauge, 16, hydraulic servo motor, 17, the push-pull actuator, 18, the stress transducer, 19, the push-pull actuating rod, 20, the computer, 21, the backing plate, 22, the bolt, 23, shear box base, 24, shear box lateral wall.
Detailed Description
In order to facilitate understanding of the present application, the technical solutions in the present application will be described more fully and in detail with reference to the drawings and the preferred embodiments, but the scope of protection of the present application is not limited to the following specific embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.
It will be understood that when an element is referred to as being "coupled" or "connected" to another element, it can be directly coupled, connected or communicated with the other element or indirectly coupled, connected or communicated with the other element via other intervening elements.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application.
Referring to fig. 1 to 3, the method for testing the shearing property of the vertical junked tire-soil interface of the present application adopts a device for testing the shearing property of the vertical junked tire-soil interface, and includes the following steps:
step S1, installing servo control system
The push-pull actuator 17 and the hydraulic servo motor 16 are both arranged on the horizontal ground, the push-pull actuating rod 19 is vertically arranged on the push-pull actuator 17, the bottom of the push-pull actuating rod 19 is connected with the power output part of the push-pull actuator 17 and is connected with the push-pull actuator 17 and the hydraulic servo motor 16, and threads are arranged on the outer surface of the push-pull actuating rod 19.
Step S2, installing the sample system and annular shearing box
The reaction frame 6 is placed on the horizontal ground, and the annular shearing box 7 is fixedly arranged on the reaction frame 6, so that the annular shearing box 7 and the push-pull actuating rod 19 are coaxial.
The center positions of the actuating table base 11 and the actuating table top cover 13 are respectively provided with a round hole for penetrating through the push-pull actuating rod 19, the actuating table base 11 with the diameter equal to that of the waste tire 9 is arranged on the horizontal ground, the lower end of a rod-shaped object with the diameter equal to that of the push-pull actuating rod 19 is inserted into the round hole in the center of the actuating table base 11, the surface of the rod-shaped object is evenly coated with a lubricant to form a lubricating layer, and the waste tire 9 is horizontally arranged on the actuating table base 11.
Selecting a soil sample on the spot, weighing the mass of the corresponding soil sample according to the soil density, the soil water content and the space volume in the waste tire 9, uniformly stirring the soil sample in the waste tire 9, tamping the soil sample into a soil sample II 10 in a layered filling mode, placing an actuating table top cover 13 with the same diameter as the waste tire 9 on the upper surface of the waste tire 9, and correspondingly inserting the upper end of a rod-shaped object into a circular hole in the center of the actuating table top cover 13.
And rotatably installing a bottom spiral disc 12 on the push-pull actuating rod 19, hoisting the assembled sample system, moving the sample system to a corresponding position and ensuring the sample system to be horizontal, enabling the central axis of the rod-shaped object to coincide with the central axis of the pre-installed push-pull actuating rod 19, slowly descending the sample system, inserting the push-pull actuating rod 19 into the soil sample II 10 from bottom to top and ejecting the rod-shaped object until the actuating table base 11 is attached to the bottom spiral disc 12, and vertically penetrating the push-pull actuating rod 19 through the whole sample system at the moment.
Step S3, height adjustment of sample system
Starting the push-pull actuator 17, preliminarily determining the approximate position of the sample system by the vertical movement of the push-pull actuator rod 19, wherein the vertical distance between the horizontal center lines of the waste tire 9 and the annular shearing box 7 is not more than 10cm, and further finely adjusting the position of the sample system by rotating the bottom spiral disc 12 to ensure that the horizontal center lines of the waste tire 9 and the annular shearing box 7 are superposed.
Step S4, installing confining pressure loading system
Annular shear box 7 includes shear box base 23, shear box lateral wall 24, shear box top cap 8 and backing plate 21, shear box top cap 8 and shear box base 23 are the annular, and the two level sets up and relative from top to bottom, shear box lateral wall 24 is vertical to be set up and is used for linking into the round with shear box base 23 and shear box top cap 8's radial outer end, backing plate 21 is annular and quantity is two, and the two sets up respectively on shear box top cap 8 and shear box base 23's opposite face.
The pads 21, which are chosen to be of matching dimensions, are mounted in the annular shear box 7 so that the radially inner ends of the pads 21 are in contact with the outer side of the scrap tyre 9 and the radially outer ends are in contact with the shear box side walls 24.
Firstly, evenly daub the emollient on the internal face of the cavity space that is enclosed by backing plate 21 and shear box lateral wall 24 in order to form lubricating layer 5, then put into the cavity space with confined pressure gasbag 3, confined pressure gasbag 3 external air pump 1 and be equipped with manometer 2 on connecting the gas circuit, open air pump 1 and carry out pre-inflation to confined pressure gasbag 3, make confined pressure gasbag 3 expand and closely laminate with the cavity inner wall, refer to soil sample II 10 at last, stir soil evenly and tamp according to the mode of layering packing in the remaining space of the radial inboard of cavity and make soil sample I4, the radial medial surface of soil sample I4 contacts with the lateral surface of junked tire 9.
Step S5 of applying an anisotropic load
The top spiral disc 14 is rotatably installed on the push-pull actuating rod 19, the position of the actuating table top cover 13 is fixed and pressure is applied from top to bottom, so that vertical load is provided for a waste tire-soil vertical interface, the air pump 1 is started, and horizontal load is provided for the waste tire-soil vertical interface by inflating the confining pressure air bag 3.
Step S6, shear test
Firstly, a displacement meter 15 is installed, a stress sensor 18 is installed on a push-pull actuating rod 19, a hydraulic servo motor 16 is started, a shear experiment is carried out on the push-pull actuating rod 19 by injecting hydraulic oil into a push-pull actuator 17 to apply stress in the vertical direction to the push-pull actuating rod 19, the readings of the stress sensor 18 and the displacement meter 15 are measured, and the measured shear stress and shear displacement data are transmitted and recorded to a computer 20 in real time.
And then, the confining pressure is unloaded through the air pump 1, all samples are unloaded, the stress is unloaded through the hydraulic servo motor 16, finally, the magnitude of the confining pressure applied by the confining pressure air bag 3 is changed, and the steps are repeated to obtain the stress and displacement data under the corresponding confining pressure condition. Substituting multiple groups of experimental data into formula
Calculating shear mechanics parameters, where τ is the stress sensor reading, σ is the confining pressure, c is the cohesion of the vertical interface,
is the internal friction angle.
And (5) changing the vertical load applied in the step S5 to simulate different burial depths, and repeating the steps to obtain the shearing mechanical parameters under different burial depths.
Examples
According to the above process, a buried depth of 15 meters is first simulated, a vertical load of 300kPa is applied in step S5, the confining pressure at the first test is 45.1kPa, the stress sensor reading is 28.4kPa, the confining pressure at the second test is 60.5kPa, the stress sensor reading is 34.1kPa, and the following system of equations of binary equations is established:
obtaining by solution:
c is 12 kPa. Therefore, the shear mechanical parameters of the vertical interface between the waste tire and the soil under the condition of the buried depth of 15m are as follows: the cohesion was 12kPa and the internal friction angle was 20 °.
Then, in step S5, the vertical load is changed to 100kPa, that is, the simulated burial depth is 5 meters, and the above process is repeated and the shear mechanical parameters corresponding to the junked tire-soil vertical interface are calculated as follows: the cohesion was 11kPa, and the internal friction angle was 15 °.
In the method, a circulating oil path is arranged between the hydraulic servo motor 16 and the push-pull actuator 17, and the driving hydraulic oil circularly flows between the hydraulic servo motor 16 and the push-pull actuator 17, so that the cyclic change of the stress borne by the push-pull actuating rod 19 is realized, and further the cyclic reciprocating shearing test of the waste tire-soil vertical interface is realized.
In the method, the actuating platform is divided into the base and the top cover which can independently act, so that the test requirements of the waste tires with different tread widths (namely, axial sizes) can be met. In order to meet the test requirements of the waste tires with different radial dimensions, the base plate 21 is detachably connected with the shear box top cover 8 and the shear box base 23, and the base plate 21 with the proper length of the extending part exceeding can be replaced according to the radial dimension of the corresponding waste tire.
In the method, the backing plate 21, the shear box top cover 8 and the shear box base 23 are specifically connected by bolts 22, and in order to enhance the connection firmness, the number of the bolts 22 is two or more in radial arrangement.
In general, the testing device can be used with the pad 21 when the diameter of the tire to be tested is small, see in particular fig. 2 and 3; when the diameter of the tire to be tested is larger and the tread of the tire can be in direct contact with the radial inner end of the annular shear box, the base plate 21 and the bolts 22 for connection can be omitted (or the size of the base plate 21 is equal to the radial size of the confining pressure air bag 3 and the soil sample I4), and the specific reference is made to FIG. 4.
In the method, the used device for testing the shearing property of the waste tire-soil vertical interface further comprises a data acquisition system, wherein the data acquisition system comprises a stress sensor 18 and a computer 20, and the stress sensor 18 transmits detected data information to the computer 20 to realize real-time data recording. In order to record more data, the data acquisition system further comprises a displacement meter 15, wherein the displacement meter 15 is connected with the sample system and can transmit the detected shearing displacement information to the computer 20.
In the method, the measuring range of the displacement meter 15 is 50cm, and the precision is 0.1 mm; the measuring range of the stress sensor 18 is 5MPa, and the precision is 1 kPa; the measuring range of the air pump 1 is 500kPa, and the precision is 1 kPa.
Therefore, the testing method provided by the application has the advantages of convenience in operation, high efficiency and safety in the testing process, high precision of the testing result and the like, provides convenience for the research of the mechanical properties of the waste tire reinforced soil, provides beneficial supplement for the development of the reinforced soil mechanical property testing technology, promotes the application of the waste tire in geotechnical engineering such as embankments, side slopes, retaining walls and the like, is beneficial to solving the recycling problem of the waste tire, has important theoretical and engineering significance for resource recycling and ecological environment protection, and has a wide application prospect.
The above description is only a few examples of the present application and does not limit the scope of the claims of the present application, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present application. Any improvement or equivalent replacement directly or indirectly applicable to other related technical fields within the spirit and principle of the present application by using the contents of the specification and the drawings of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method for testing shearing characteristics of a vertical interface between a waste tire and soil is characterized by comprising the following steps:
step S1, installing a servo control system: the push-pull actuating rod (19) is vertically arranged on the push-pull actuator (17) and is connected with the push-pull actuator (17) and the hydraulic servo motor (16);
step S2, mounting the sample system and the annular shear box (7): fixedly arranging an annular shear box (7) on a reaction frame (6), arranging a waste tire (9) on an actuating table base (11), arranging a soil sample II (10) in the waste tire (9), arranging an actuating table top cover (13) on the waste tire (9), and fixedly arranging an assembled sample system on a push-pull actuating rod (19) to enable the waste tire (9) and the annular shear box (7) to share a central axis;
step S3, debugging the height of the sample system: starting a push-pull actuator (17), and driving a sample system to vertically move through a push-pull actuating rod (19) so as to enable the horizontal center lines of the waste tires (9) and the annular shearing box (7) to coincide;
step S4, installing a confining pressure loading system: a confining pressure air bag (3) and a soil sample I (4) are sequentially arranged in the annular shearing box (7) from outside to inside along the radial direction in an annular mode, the confining pressure air bag (3) is externally connected with an air pump (1), a pressure gauge (2) is arranged on a connecting air path, and the radial inner side face of the soil sample I (4) is in contact with the outer side face of a waste tire (9);
step S5, applying an anisotropic load: applying pressure to the top cover (13) of the actuating table according to the simulated burial depth to provide vertical load for a vertical interface of the waste tire and the soil, and inflating the confining pressure air bag (3) to provide horizontal load for the vertical interface of the waste tire and the soil;
step S6, shear test: the method comprises the steps that a displacement meter (15) is installed, a stress sensor (18) is installed on a push-pull actuating rod (19), a hydraulic servo motor (16) is started to apply stress to the push-pull actuating rod (19) to carry out a shearing experiment, and shearing stress and shearing displacement data are measured through the stress sensor (18) and the displacement meter (15) respectively.
2. The method for testing the shearing property of the waste tire-soil vertical interface as claimed in claim 1, wherein in the step S2, round holes for passing through the push-pull actuating rod (19) are formed at the central positions of the actuating platform base (11) and the actuating platform top cover (13); the process of installing the sample system specifically includes:
the method comprises the steps of placing an actuating table base (11) on a horizontal ground, inserting the lower end of a rod-shaped object with the diameter equal to that of a push-pull actuating rod (19) into a round hole in the center of the actuating table base (11), horizontally placing a waste tire (9) on the actuating table base (11), uniformly stirring soil in the waste tire (9), tamping the soil into a soil sample II (10) in a layered filling mode, placing an actuating table top cover (13) on the upper surface of the waste tire (9), and correspondingly inserting the upper end of the rod-shaped object into the round hole in the center of the actuating table top cover (13).
3. The method for testing the shear characteristics of the vertical junked tire-soil interface as claimed in claim 2, wherein in the step S2, the sample system is fixedly mounted on the push-pull actuating rod (19) through the bottom spiral disk (12), and the outer surface of the push-pull actuating rod (19) is provided with threads; the process of installing the sample system further comprises:
and rotatably installing a bottom spiral disc (12) on a push-pull actuating rod (19), hoisting the assembled sample system and horizontally moving the assembled sample system to a target position to enable the central axis of the rod-shaped object and the central axis of the push-pull actuating rod (19) to coincide, lowering the sample system, inserting the push-pull actuating rod (19) into the soil sample II (10) from bottom to top and ejecting the rod-shaped object until an actuating table base (11) is attached to the bottom spiral disc (12).
4. The method for testing the shearing property of the waste tire-soil vertical interface as claimed in claim 3, wherein in the step S3, the process of adjusting the height of the sample system specifically comprises:
and starting a push-pull actuator (17), driving the sample system to vertically move to a target position by pushing and pulling an actuating rod (19), so that the distance between the horizontal center lines of the waste tires (9) and the annular shearing box (7) is not more than 10cm, and rotating the spiral disc (12) at the bottom to finely adjust the position of the sample system until the horizontal center lines of the waste tires (9) and the annular shearing box (7) are completely overlapped.
5. The method for testing the shearing property of the waste tire-soil vertical interface as claimed in claim 4, wherein the step S4 is implemented by installing a confining pressure loading system, which comprises:
horizontal detachable annular base plates (21) are respectively arranged on the upper and lower opposite inner walls of the annular shear box (7), so that the radial inner ends of the base plates (21) are in contact with the outer side surfaces of the waste tires (9), and the radial outer ends of the base plates are in contact with the shear box side walls (24) of the annular shear box (7); firstly, placing a confining pressure air bag (3) into a cavity space surrounded by a base plate (21) and a shearing box side wall (24), then opening an air pump (1) to pre-inflate the confining pressure air bag (3) to enable the confining pressure air bag (3) to expand and be tightly attached to the inner wall of the cavity, and finally stirring soil uniformly and tamping the soil into a soil sample I (4) in the residual space of the cavity in a layered filling mode.
6. The method for testing shearing characteristics of a waste tire-soil vertical interface as recited in claim 5, wherein the step S2 further comprises a process of uniformly applying a lubricant on the surface of the stick to form a lubricating layer, and the step S4 further comprises a process of uniformly applying a lubricant on the inner wall of the cavity to form a lubricating layer.
7. The junked tire-soil vertical interface shear property test method of claim 6, wherein in the step S5, the pressure is applied to the table top cover (13) by disposing the top spiral disk (14) above the table top cover (13); the process of applying the isotropic load specifically includes:
the top spiral disc (14) is rotatably installed on the push-pull actuating rod (19), the position of the actuating table top cover (13) is fixed from top to bottom, corresponding vertical load is applied, the air pump (1) is started, and the confining pressure air bag (3) is inflated and expanded to apply corresponding horizontal load.
8. The method for testing the shearing property of the waste tire-soil vertical interface as claimed in claim 7, wherein in the step S6, the shearing experiment process specifically comprises:
firstly, a hydraulic servo motor (16) is started to push a push-pull actuating rod (19) to carry out a shear test, the readings of a stress sensor (18) and a displacement meter (15) are measured, and the measured shear stress and shear displacement data are transmitted and recorded to a computer (20) in real time; and then, the confining pressure is unloaded through the air pump (1), all samples are unloaded, the stress is unloaded through the hydraulic servo motor (16), finally, the confining pressure applied by the confining pressure air bag (3) is changed, and the shearing experiment is repeated to obtain the stress and displacement data under the corresponding confining pressure condition.
9. The method for testing the shearing property of the waste tire-soil vertical interface as recited in claim 8, wherein in the step S6, the shearing experiment further comprises: the magnitude of the vertical load applied in step S5 was varied to simulate different depths of burial and the shear experiment was repeated.
10. The method for testing the shearing property of the vertical waste tire-soil interface as recited in any one of claims 1 to 9, wherein in the step S1, a circulating oil path is provided between the hydraulic servo motor (16) and the push-pull actuator (17); in the step S6, by driving hydraulic oil to circularly flow between the hydraulic servo motor (16) and the push-pull actuator (17), a circularly changing vertical stress is applied to the push-pull actuator rod (19), so as to realize a circular reciprocating shear test on a vertical interface between the waste tire and the soil.
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Application publication date: 20220311 Assignee: Hunan Sanjiang Engineering Consulting Co.,Ltd. Assignor: CHANGSHA University Contract record no.: X2025980038567 Denomination of invention: A testing method for the shear characteristics of vertical interfaces between waste tires and soil Granted publication date: 20240412 License type: Common License Record date: 20251201 |