CN113174818A - Method for improving expansive mudstone in arid area - Google Patents
Method for improving expansive mudstone in arid area Download PDFInfo
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- CN113174818A CN113174818A CN202110449779.5A CN202110449779A CN113174818A CN 113174818 A CN113174818 A CN 113174818A CN 202110449779 A CN202110449779 A CN 202110449779A CN 113174818 A CN113174818 A CN 113174818A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 41
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 41
- 239000004571 lime Substances 0.000 claims abstract description 41
- 238000005096 rolling process Methods 0.000 claims abstract description 19
- 239000011435 rock Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 235000019738 Limestone Nutrition 0.000 claims abstract description 9
- 239000006028 limestone Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 6
- 230000001502 supplementing effect Effects 0.000 claims abstract description 5
- 230000003068 static effect Effects 0.000 claims abstract description 4
- 230000007480 spreading Effects 0.000 claims description 7
- 230000008929 regeneration Effects 0.000 claims description 6
- 238000011069 regeneration method Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 241000883966 Astrophytum capricorne Species 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 26
- 230000006872 improvement Effects 0.000 abstract description 18
- 230000001965 increasing effect Effects 0.000 abstract description 17
- 239000002245 particle Substances 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 5
- 239000004927 clay Substances 0.000 abstract description 3
- 210000000078 claw Anatomy 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 17
- 238000012360 testing method Methods 0.000 description 7
- 239000002689 soil Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000005056 compaction Methods 0.000 description 4
- 238000012669 compression test Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses an improvement method of expansive mudstone in arid regions, which relates to the field of expansive mudstone improvement and comprises the steps of S1, measuring the positions of middle piles and side piles of a roadbed, and determining a roadbed filling control line; s2, determining the position of the reversely-discharged loose and laid mudstone, and reversely-discharging the loose and laid mudstone; s3, determining the mass of lime needed, and scattering the lime on the loosely laid mudstone; s4, controlling the water supplementing amount, enabling the cold recycling road mixer to be parallel to the watering lorry, mixing water at a constant speed, and loosely paving the mudstone and the lime to form limestone mudstone; s5, after the ash content and the water content are checked to be qualified, carrying out static pressure, claw rolling strong vibration, land leveler leveling and smooth wheel rolling and light collection on the vibratory roller; after the method is improved, the clay content of the weathered mud rock is relatively reduced, the powder content is increased, and the particle grading is improved; the improved mudstone weathered material has obviously weakened expansibility and enhanced water stability, the free expansion rate is reduced to about 20 percent, the linear expansion rate is reduced to about 0.6 percent, and the improvement effect of the lime on the expansibility of the mudstone weathered material is obvious.
Description
Technical Field
The invention relates to the field of expansive mudstone improvement, in particular to an improvement method of expansive mudstone in arid regions.
Background
The expansion mudstone is widely distributed in the northwest China, and particularly in the gully regions of loess hills and loess hills, the mudstone has a muddy structure, a medium-thickness layered structure and a semi-diagenetic shape, is easy to soften and disintegrate when meeting water, and is easy to crack after losing water. For the above problems, the conventional improvement method is to mix the dust, but the dust mixing amount and the dust mixing uniformity are very difficult to control, and the water content is also the key to control the compaction degree, which is very easy to cause poor improvement of the expansive mudstone and easy sinking of the roadbed.
Disclosure of Invention
The invention aims to solve the problems and designs an improved method for expansive mudstone in arid regions.
The invention realizes the purpose through the following technical scheme:
the method for improving the expansive mudstone in the arid region comprises the following steps:
s1, measuring the positions of the middle piles and the side piles of the roadbed, and determining a roadbed filling control line required by the filling width;
s2, obtaining the thickness of the mud rock of Songpu according to the capacity of the dumper hopper, determining the position range of the mud rock paved in a dumping and loosening mode each time, and dumping and loosening the mud rock paved in the dumper hopper;
s3, determining the mass of lime required by each square according to the thickness of the loosely laid mudstone, and uniformly spreading the lime on the loosely laid mudstone by a powder spreading vehicle;
s4, controlling water supplementing quantity according to the water content of the paved loosely-paved mudstone, enabling a cold regeneration road mixer to be parallel to a sprinkler, enabling the cold regeneration road mixer to mix water, the loosely-paved mudstone and lime spread on the loosely-paved mudstone at a constant speed, measuring the lime dosage and the water content, if the lime or water is insufficient, supplementing the lime or water which is insufficient correspondingly, and mixing the lime or water at a constant speed uniformly to form the limestone mudstone;
and S5, sequentially sampling and checking the ash content and the water content of the limestone, and after the sampling and checking are qualified, sequentially performing primary vibratory roller static pressure, repeated goat' S horn rolling strong vibration, land leveler leveling and primary smooth wheel roller rolling light collection.
The invention has the beneficial effects that: the content of clay particles of the weathered mud rock is relatively reduced, the content of powder particles is increased, and the particle grading is improved; the improved mudstone weathered substance has obviously weakened expansibility and enhanced water stability, the free expansion rate is reduced to about 20 percent, the linear expansion rate is reduced to about 0.6 percent, and the improvement effect of lime on the expansibility of the mudstone weathered substance is obvious; the unconfined compressive strength of the improved mudstone weathered material is increased, the cohesive force of the improved mudstone weathered material is increased along with the increase of the ash doping rate, and the internal friction angle is not changed greatly.
Drawings
FIG. 1 is a graph of grading before and after improvement of expansive mudstone;
FIG. 2 is a curve of compaction before and after modification of expansive mudstone;
FIG. 3 is a graph showing the relationship between the free expansion rate and the ash content of the improved expansive mudstone;
FIG. 4 is a graph showing the linear expansion rate time course of a mudstone weathered material under different ash-doping rates;
FIG. 5 is a table of disintegration test results before and after improvement of expandable mudstone;
FIG. 6 is a graph of axial stress versus axial strain from a triaxial compression test;
FIG. 7 is a table of shear strength indexes of mudstone weathers at different ash incorporation rates and different curing ages obtained by a triaxial compression test.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The method for improving the expansive mudstone in the arid region comprises the following steps:
s1, checking and accepting the compactness, the flatness, the width, the longitudinal high-rise and the transverse slope of the roadbed before limestone mudstone filling construction, measuring the positions of middle piles and side piles of the roadbed, filling the side piles which are 50cm wider than the width of the roadbed, wherein the distance between every two adjacent middle piles and every two adjacent side piles is 10 m-20 m, and adopting lime to fill the roadbed according to the width of the roadbed.
S2, obtaining the thickness of mud rock of Songpu according to the capacity of the dump truck hopper, determining the position range of mud rock paving in each dumping and dumping mode, and determining the position range of mud rock paving in 24m of each truck3And if the thickness of the loosely laid mudstone is 0.25m, the total area of the position range is 24/0.25-96 square meters, marking the position range by lime according to the area, dumping the loosely laid mudstone by a dump truck hopper, and uniformly spreading the loosely laid mudstone in the position range.
S3, determining the mass of lime required by each square according to the thickness of the loosely laid mudstone, wherein the mass of the lime is
Wherein M represents the lime content required by design, the quality parameter of lime required by each square is set in an intelligent control system on the powder spreading vehicle, the ash discharge amount is controlled under the condition that the powder spreading vehicle travels at a constant speed, and the lime is uniformly spread on the loosely laid mudstone in the traveling process.
S4, controlling water replenishing quantity according to the water content of laid loose mudstone, connecting a cold regeneration road mixer and a sprinkler through plastic pipes in parallel, mixing water, the loose mudstone and lime spread on the loose mudstone at a constant speed by the cold regeneration road mixer, replenishing water by the sprinkler, measuring the lime dosage and the water content, wherein the lime mixing rate of lime ranges from 3% to 7% and the water content ranges from 8.2% to 11.6%, if the lime or water is insufficient, the lime or water which is insufficient correspondingly is replenished, and the lime or water is mixed uniformly at a constant speed to form the lime mudstone.
S5, sequentially sampling and checking the ash content and the water content of the limestone mud rock by adopting an EDTA titration test, confirming the optimal water content standard of the limestone mud rock after the sampling and checking are qualified, and then sequentially performing static pressure of a vibratory roller, repeated goat' S horn rolling strong vibration, leveling of a land leveler and rolling and polishing of a smooth-wheel roller; and during rolling, sequentially rolling from the edge of the roadbed to the middle along the longitudinal direction of the road, wherein the overlapping width of the wheel tracks of the first rolling and the second rolling is not less than 1/3 of the rolling width of the road roller and not less than 50cm, and the full width is completely rolled by adopting a one-step-forward-backward mode.
And S6, watering and curing the road surface for 7 days.
In order to ensure that each index of a filling layer is qualified, before limestone filling construction, samples with different water contents and different ash doping rates are manufactured to respectively carry out compaction tests, and the influence of the change of the maximum dry density and the optimal water content on expansibility, water stability, compressibility and shear strength is researched; the particle size distribution conditions of 0%, 2%, 5% and 7% of mudstone weathered materials are respectively measured by a screening method and a particle size analyzer test method, and a grading curve is shown in figure 1, so that the clay content of the improved mudstone weathered materials is obviously reduced, the particle content is increased, and in addition, the grading curve of the improved mudstone weathered materials tends to be smooth, so that the particle distribution is more uniform, and the particle grading is improved.
The compaction curves before and after the shale weathered material is improved are shown in fig. 2, and it can be seen that the maximum dry density of the improved shale weathered material is reduced and the optimal water content is increased along with the increase of the ash doping rate, and the optimal water content is slightly increased due to the participation of water required by ion exchange, gelation, carbonation and the like in the improvement process; the chemical action that occurs during modification causes the original microparticles to form agglomerates, which are relatively loose in structure, and thus their maximum dry density is reduced.
The mudstone weathered material contains a certain amount of clay minerals, so that the mudstone weathered material has the characteristics of water absorption expansion and water loss contraction, and cannot be directly used as roadbed filling. The change of the expansion performance of the modified mudstone weathered material is researched by testing the expansion rate of the modified mudstone weathered material with the ash doping rate of 0, 2%, 5% and 7%.
Fig. 3 is a curve of the relationship between the free expansion rate and the ash doping rate of the improved mudstone weathered material, the free expansion rate of the improved mudstone weathered material is obviously reduced along with the increase of the ash doping rate, the free expansion rate of the mudstone weathered material before being improved is 42 percent and has weak expansibility, and the expansion rate of the mudstone weathered material after being improved is reduced to be below 40 percent, which shows that the expansibility of the mudstone weathered material is greatly weakened, and the expansibility of the mudstone weathered material after being improved meets the requirement of the specification on the filler.
Fig. 4 is a time-course curve of the linear expansion coefficients of the mudstone weathered objects under different ash-doping rates, the linear expansion coefficient of the mudstone weathered objects after the improvement is obviously reduced compared with that before the improvement, the linear expansion coefficient of the mudstone weathered objects at the beginning of the test is increased at a higher speed, and then the increasing speed is gradually reduced until the mudstone weathered objects are stabilized, the linear expansion coefficient of the mudstone weathered objects before the improvement is 1.31%, and the linear expansion coefficient of the mudstone weathered objects after the improvement is reduced to about 0.6%, which shows that the expansibility of the mudstone weathered objects is obviously improved.
The sample begins to absorb water after entering water and generates bubbles, the phenomenon is very obvious in a few minutes before the test, small soil sample blocks fall off, and then the small soil sample blocks are not obvious gradually, and only the small soil sample blocks slowly fall off. The results of disintegration test before and after modification with mudstone weathers are shown in fig. 5: along with the increase of the ash mixing rate, the disintegration time of the sample is prolonged, which shows that the disintegration resistance of the improved shale weathered substance is enhanced, and the water stability is enhanced; when the ash mixing rate is 5-7%, the disintegration time is prolonged after curing for 7d, and the water stability is further enhanced; when the ash content is 0, the water content of the soil sample may decrease depending on the curing time and the curing environment, and the disintegration time of the soil sample after curing for 7 days may be slightly shortened.
A relation curve of axial stress and axial strain is obtained by a triaxial compression test, as shown in fig. 6, the axial stress of the improved mudstone weathered object is obviously increased, the improved mudstone weathered object enters a failure stage immediately after the compression curve reaches a peak value, and the axial stress does not change greatly along with the increase of the strain after the compression curve of the improved mudstone weathered object reaches the peak value; along with the increase of the ash doping rate, the unconfined compressive strength of the improved mudstone weathered substance is increased, and the unconfined compressive strength of the improved mudstone weathered substance with the ash doping rate of 5-7% is relatively close; when the improved mudstone weathered substance is maintained for 7 days, the unconfined compressive strength of the improved mudstone weathered substance is improved by 30-40% compared with that before the improved mudstone weathered substance is maintained, lime has a great effect on the later strength of the mudstone weathered substance, but after the improved mudstone weathered substance is maintained for 7 days, the unconfined compressive strength of the improved mudstone weathered substance is only increased by 5-7% along with the extension of the maintenance age, and the influence of the maintenance age is not obvious any more.
The shear strength indexes of the mudstone weathered objects under different ash-doping rates and different curing ages can be obtained through a triaxial compression test, as shown in fig. 7, wherein: c is cohesive force;
is an internal friction angle;
from fig. 7, it can be found that: the cohesive force of the shale weathered material is increased along with the increase of the ash doping rate, and the internal friction angle is not changed greatly. After the curing is carried out for 7d, the cohesive force of the mudstone weathered material is further improved. The reason is that chemical actions such as carbonation, gelation and the like occur in the process of improving the soil body by lime, and substances which are beneficial to the connection between particles are generated, so that the cohesive force of the particles is enhanced. The cohesive force of the mudstone weathered material is still slightly improved in the curing 14d compared with the curing 7d, but the effect of enhancing the cohesive force is not particularly remarkable compared with the curing 7 d.
Therefore, after the improvement of the method:
the content of sticky particles of the improved shale weathered substance is relatively reduced, the content of particles is increased, and the particle grading is improved; with the increase of the ash doping rate, the maximum dry density of the improved shale weathered matter is reduced, and the optimal water content is increased;
the improved mudstone weathered substance has obviously weakened expansibility and enhanced water stability, the free expansion rate is reduced to about 20 percent, the linear expansion rate is reduced to about 0.6 percent, and the improvement effect of lime on the expansibility of the mudstone weathered substance is obvious;
after the cement is improved by lime, the unconfined compressive strength of the weathered shale is increased, the cohesive force of the weathered shale is increased along with the increase of the cement mixing rate, and the change of an internal friction angle is small;
4) after curing for 7 days, the unconfined compressive strength and the shear strength of the improved mudstone weathered material are both greatly improved; compared with the curing process of 7 days, after the curing process of 14 days, the unconfined compressive strength and the shear strength of the shale weathered material are improved to a small extent, and in conclusion, the particle composition, the water stability and the expansibility of the shale weathered material are all obviously improved after the improvement of lime.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (7)
1. The method for improving the expansive mudstone in the arid region is characterized by comprising the following steps of:
s1, measuring the positions of the middle piles and the side piles of the roadbed, and determining a roadbed filling control line required by the filling width;
s2, obtaining the thickness of the mud rock of Songpu according to the capacity of the dumper hopper, determining the position range of the mud rock paved in a dumping and loosening mode each time, and dumping and loosening the mud rock paved in the dumper hopper;
s3, determining the mass of lime required by each square according to the thickness of the loosely laid mudstone, and uniformly spreading the lime on the loosely laid mudstone by a powder spreading vehicle;
s4, controlling water supplementing quantity according to the water content of the paved loosely-paved mudstone, enabling a cold regeneration road mixer to be parallel to a sprinkler, enabling the cold regeneration road mixer to mix water, the loosely-paved mudstone and lime spread on the loosely-paved mudstone at a constant speed, measuring the lime dosage and the water content, if the lime or water is insufficient, supplementing the lime or water which is insufficient correspondingly, and mixing the lime or water at a constant speed uniformly to form the limestone mudstone;
and S5, sequentially sampling and checking the ash content and the water content of the limestone, and after the sampling and checking are qualified, sequentially performing primary vibratory roller static pressure, repeated goat' S horn rolling strong vibration, land leveler leveling and primary smooth wheel roller rolling light collection.
2. The method for improving expansive mudstone in arid regions according to claim 1, wherein the distance between two adjacent middle piles and two adjacent side piles is in the range of 10m to 20m in S1.
3. The method for improving expansive mudstone in arid regions according to claim 1, wherein in S3, the mass of lime is:
4. the method for improving expansive mudstone in arid regions according to claim 1, wherein in S4, the lime blending rate is in the range of 3-7% and the water content is in the range of 8.2% -11.6%.
5. The method for improving expansive mudstone in arid regions according to claim 1, wherein the overlap width of the longitudinal tracks of the cold reclamation road mixer is greater than 50cm at S4, and the mixing and traveling speed is 1m/10S to 2 m/10S.
6. The method for improving expansive mudstone in arid regions according to claim 1, wherein in S5, the rolling is performed in a one-step rolling and one-step rolling manner, the rolling overlapping width between two adjacent steps is not less than one third of the rolling action surface, and the rolling overlapping width is not less than 50 cm.
7. The method for improving expansive mudstone in arid regions as claimed in claim 1, wherein the method comprises, after S5, S6 of sprinkling water on the road surface for 7 days.
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| CN202110449779.5A CN113174818A (en) | 2021-04-25 | 2021-04-25 | Method for improving expansive mudstone in arid area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115100609A (en) * | 2022-08-26 | 2022-09-23 | 北京江河惠远科技有限公司 | Extra-high voltage construction disturbance range extraction method and system |
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| KR101042194B1 (en) * | 2009-12-29 | 2011-06-20 | 박종업 | Green eco-friendly ground pavement method using natural soil |
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| CN111411554A (en) * | 2020-04-23 | 2020-07-14 | 中铁二十五局集团第二工程有限公司 | Improvement method of collapsible loess in northwest arid region |
| CN111893830A (en) * | 2020-07-27 | 2020-11-06 | 中交路桥建设有限公司 | Material selection method for weak expansive soil roadbed construction |
| CN112227345A (en) * | 2020-09-29 | 2021-01-15 | 中交路桥建设有限公司 | Construction method for improving cement mixing of expansive soil |
-
2021
- 2021-04-25 CN CN202110449779.5A patent/CN113174818A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004027120A (en) * | 2002-06-27 | 2004-01-29 | Okutama Kogyo Co Ltd | Method for improving soil quality |
| KR101042194B1 (en) * | 2009-12-29 | 2011-06-20 | 박종업 | Green eco-friendly ground pavement method using natural soil |
| CN105297571A (en) * | 2015-11-20 | 2016-02-03 | 安徽省交通控股集团有限公司 | Mudstone filled roadbed structure and construction method thereof |
| CN106245503A (en) * | 2016-08-12 | 2016-12-21 | 马鞍山十七冶工程科技有限责任公司 | A kind of for rendzinas control debulking methods in roadbed filling |
| CN111411554A (en) * | 2020-04-23 | 2020-07-14 | 中铁二十五局集团第二工程有限公司 | Improvement method of collapsible loess in northwest arid region |
| CN111893830A (en) * | 2020-07-27 | 2020-11-06 | 中交路桥建设有限公司 | Material selection method for weak expansive soil roadbed construction |
| CN112227345A (en) * | 2020-09-29 | 2021-01-15 | 中交路桥建设有限公司 | Construction method for improving cement mixing of expansive soil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115100609A (en) * | 2022-08-26 | 2022-09-23 | 北京江河惠远科技有限公司 | Extra-high voltage construction disturbance range extraction method and system |
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Application publication date: 20210727 |