CN111549810A - Sealant for bottom of deep flexible waterproof curtain and preparation and pouring method thereof - Google Patents
Sealant for bottom of deep flexible waterproof curtain and preparation and pouring method thereof Download PDFInfo
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- CN111549810A CN111549810A CN202010351541.4A CN202010351541A CN111549810A CN 111549810 A CN111549810 A CN 111549810A CN 202010351541 A CN202010351541 A CN 202010351541A CN 111549810 A CN111549810 A CN 111549810A
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- waterproof curtain
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- 239000000565 sealant Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000002347 injection Methods 0.000 claims description 47
- 239000007924 injection Substances 0.000 claims description 47
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 40
- 238000003756 stirring Methods 0.000 claims description 26
- 239000002002 slurry Substances 0.000 claims description 23
- 239000004927 clay Substances 0.000 claims description 22
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical group O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 19
- 229940080314 sodium bentonite Drugs 0.000 claims description 19
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 19
- 229940092782 bentonite Drugs 0.000 claims description 9
- 229910000278 bentonite Inorganic materials 0.000 claims description 9
- 239000000440 bentonite Substances 0.000 claims description 9
- 239000001913 cellulose Substances 0.000 claims description 9
- 229920002678 cellulose Polymers 0.000 claims description 9
- 229920000831 ionic polymer Polymers 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000009775 high-speed stirring Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000011049 filling Methods 0.000 abstract description 11
- 238000007789 sealing Methods 0.000 abstract description 11
- 239000002689 soil Substances 0.000 abstract description 7
- 230000010412 perfusion Effects 0.000 abstract description 4
- 239000012812 sealant material Substances 0.000 abstract description 3
- 239000011435 rock Substances 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 229920006262 high density polyethylene film Polymers 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/44—Products obtained from layered base-exchange silicates by ion-exchange with organic compounds such as ammonium, phosphonium or sulfonium compounds or by intercalation of organic compounds, e.g. organoclay material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/16—Restraining of underground water by damming or interrupting the passage of underground water by placing or applying sealing substances
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Paleontology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Inorganic Chemistry (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses a sealant for the bottom of a deep flexible waterproof curtain and a preparation and filling method thereof. The sealant for the bottom of the deep flexible waterproof curtain and the preparation and perfusion methods thereof can realize the filling of the sealant to soil cracks and the complete filling of the bottom of the flexible waterproof curtain, effectively block underground water, solve the problem of leakage of a polluted medium below the flexible waterproof curtain, are suitable for sealing the bottom of the flexible waterproof curtain of 0-40m or deeper, and are particularly suitable for sealing the bottom of the deep flexible waterproof curtain of 20-40m or deeper, the sealant material is easy to obtain, and the sealant preparation and perfusion methods are convenient.
Description
Technical Field
The invention relates to a sealant for the bottom of a deep flexible waterproof curtain and a preparation and filling method thereof, belonging to the field of flexible waterproof curtains.
Background
The barrier technology is a technology which adopts engineering measures such as barrier, interception, covering and the like to control the migration of pollutants or block the exposure way of the pollutants, isolate a polluted medium from the surrounding environment and reduce and eliminate the risks of the pollutants to human health and the environment. Barrier technologies include two broad categories, horizontal and vertical barriers.
The vertical flexible waterproof curtain is one of the important technologies for vertical blocking. The existing vertical flexible waterproof curtain has the problems that the curtain is low in sealing degree with a soil layer and a rock stratum, a polluted medium is easy to leak, and the like, so that a sealant needs to be poured at the bottom of the curtain. The sealant in the prior art often has the problem that the permeability coefficient is not low enough, when the depth of the flexible waterproof curtain is deep, the requirement for bottom sealing cannot be met due to the existence of a large amount of underground water and a polluted medium, and the sealant cannot be smoothly conveyed to the target depth due to insufficient fluidity.
Disclosure of Invention
Based on the above disadvantages in the prior art, the present invention provides a sealant for the bottom of a deep flexible waterproof curtain, and a preparation and filling method thereof, which can realize filling of the sealant into soil cracks and complete filling of the bottom of the flexible waterproof curtain, effectively block underground water, solve the problem of leakage of a contaminated medium under the flexible waterproof curtain, and are suitable for sealing the bottom of a flexible waterproof curtain of 0-40m or deeper, especially suitable for sealing the bottom of a flexible waterproof curtain of 20-40m or deeper, and the sealant material is easy to obtain, and the sealant preparation and filling method is easy.
In order to achieve the purpose, the invention adopts the following technical means:
the invention provides a sealant for the bottom of a deep flexible waterproof curtain, wherein the sealant comprises modified bentonite and clay, and the modified bentonite is sodium bentonite modified by polyion cellulose.
Preferably, the clay is a local clay.
Preferably, the sealant comprises 60 to 80% by weight of modified bentonite and 20 to 40% by weight of clay.
The invention also provides a preparation method of the sealant, which comprises the following steps:
(1) adding sodium bentonite and water into a stirring tank according to the weight ratio of 1:10-15, and stirring to obtain sodium bentonite slurry;
(2) adding 0.5-2 wt% of polyion cellulose into the sodium bentonite slurry obtained in the step (1), heating to 60-80 ℃, and stirring for 5-8h by using a high-speed stirring device at the rotation speed of 1500-;
(3) drying the modified bentonite slurry obtained in the step (2) for 10-14h, crushing, and sieving with a 80-mesh sieve to obtain modified bentonite;
(4) and (4) mixing the modified bentonite obtained in the step (3) with clay sieved by a 80-mesh sieve, and fully stirring to obtain the bentonite.
The invention also provides a pouring method of the sealant at the bottom of the flexible waterproof curtain, which comprises the following steps:
(1) adding the sealant and water into a stirrer, adjusting the addition amount of the water to ensure that the slump of the sealant is 180mm, and stirring for 20-30min for later use;
(2) connecting an air compressor with an air injection pipe, and placing the air injection pipe into the bottom groove along a flexible waterproof curtain;
(3) starting an air compressor, setting the air pressure to be 0.8-1.0MPa, operating for 15-20min, and closing the air compressor after ensuring the repeated disturbance of the bottom and the small gravel;
(4) connecting a sealant delivery pump with a sealant injection pipe, and placing the sealant injection pipe into the bottom groove along the flexible waterproof curtain;
(5) and after the air compressor is closed, starting the sealant delivery pump, setting the injection pressure to be 20-30MPa, injecting the sealant, controlling the distance between injection points of each sealant to be 1-3m and the thickness to be 1-3m, and after the injection is finished, pumping out the air injection pipe and the sealant injection pipe.
Compared with the prior art, the invention has the beneficial effects that:
1. the modified bentonite used in the sealant is sodium bentonite modified by polyion cellulose, intercalation reaction can be carried out on the polyion cellulose and the sodium bentonite sheets by a specific modification method, particularly a specific stirring speed, the problems of permeation coefficient increase caused by the fact that the thickness of double electron layers of the bentonite is reduced and pore channels are enlarged in salt solution and heavy metal ions are effectively solved, meanwhile, due to the excellent performance of the modified bentonite, an ideal effect can be achieved by replacing part of the modified bentonite with clay, the weight of the clay can account for 40 percent of the weight of the sealant, and the dosage cost of the modified bentonite is greatly reduced-8cm/s to 1 × 10-9cm/s; meanwhile, the reasonable sealant pouring method can ensure that the sealant can still maintain good sealing property after being poured into the bottom groove.
2. Before the sealant is poured, the slump of the sealant is controlled within a specific range by adjusting the addition amount of water, so that the sealant has good fluidity, and the sealant can be conveyed to a target depth with sufficient depth and can be fully filled in rock stratum fractures.
3. According to the pouring method of the sealant, air is injected into the sealant under specific parameters before the sealant is injected, so that the air pressure can be ensured to perform sufficient disturbance on the precipitated slurry and small gravel within the range of 1-1.5m horizontally, and the slurry precipitation and the small gravel are prevented from being mixed into the sealant to influence the sealing effect of the sealant; by setting a specific sealant injection pressure, the sealant can be guaranteed to be pumped into the slot with a preset depth; by setting a specific sealant injection pitch and thickness, the filling and sealing effect of the sealant can be ensured.
4. In general, the sealant for the bottom of the deep flexible waterproof curtain and the preparation and perfusion methods thereof provided by the invention can realize the filling of the sealant into soil cracks and the complete filling of the bottom of the flexible waterproof curtain, effectively block underground water, solve the problem of leakage of a polluted medium below the flexible waterproof curtain, are suitable for sealing the bottom of the flexible waterproof curtain with the depth of 0-40m or more, and are particularly suitable for sealing the bottom of the flexible waterproof curtain with the depth of 20-40m or more, the sealant material is easy to obtain, and the preparation and perfusion methods of the sealant are convenient.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Example 1
The sealant of this example consisted of 60% by weight of modified bentonite clay and 40% by weight of local clay and was prepared as follows:
(1) adding sodium bentonite and water into a stirring tank according to the weight ratio of 1:15, and stirring to obtain sodium bentonite slurry;
(2) adding 2 wt% of polyion cellulose into the sodium bentonite slurry obtained in the step (1), heating to 80 ℃, and stirring for 8 hours by using a high-speed stirring device at the rotating speed of 2000r/min to obtain modified bentonite slurry;
(3) drying the modified bentonite slurry obtained in the step (2) for 14h, crushing, and sieving with a 80-mesh sieve to obtain modified bentonite;
(4) and (4) mixing the modified bentonite obtained in the step (3) with local clay sieved by a 80-mesh sieve, and fully stirring to obtain the bentonite.
Tested by a variable water head permeability test (GBT 50123--9cm/s。
The overall construction method of the 40m deep flexible waterproof curtain and the bottom sealant thereof of the embodiment is as follows:
(1) grooving: leading holes at two ends and the middle by adopting a rotary drilling rig, then digging a soil layer, a sand layer and a gravel layer between the holes by adopting a hydraulic grab, finally treating the rock layer by adopting a double-wheel groove milling machine, and pouring bentonite slurry into the groove holes to protect the walls while slotting;
(2) and (3) lowering a flexible waterproof curtain: lowering a flexible waterproof curtain (HDPE film) to a target depth by using a film lowering machine;
(3) adding the sealant and water into a stirrer, adjusting the addition amount of water to ensure that the slump of the sealant is 180mm, and stirring for 30min for later use;
(4) connecting an air compressor with an air injection pipe, and placing the air injection pipe into the bottom groove along a flexible waterproof curtain;
(5) starting an air compressor, setting the air pressure to be 1.0MPa, operating for 20min, and closing the air compressor after ensuring the repeated disturbance of the bottom and the small gravel;
(6) connecting a sealant delivery pump with a sealant injection pipe, and placing the sealant injection pipe into the bottom groove along the flexible waterproof curtain;
(7) and after the air compressor is closed, the sealant delivery pump is started, the injection pressure is set to be 30MPa, the sealant is injected, the distance between injection points of the sealant is controlled to be 1m, the thickness is controlled to be 1m, and after the injection is finished, the air injection pipe and the sealant injection pipe are extracted.
Example 2
The sealant of this example consisted of 80% by weight of modified bentonite clay and 20% by weight of local clay and was prepared as follows:
(1) adding sodium bentonite and water into a stirring tank according to the weight ratio of 1:10, and stirring to obtain sodium bentonite slurry;
(2) adding 0.5 wt% of polyion cellulose into the sodium bentonite slurry obtained in the step (1), heating to 60 ℃, and stirring for 5 hours by using a high-speed stirring device at the rotating speed of 1500r/min to obtain modified bentonite slurry;
(3) drying the modified bentonite slurry obtained in the step (2) for 10 hours, crushing, and sieving with a 80-mesh sieve to obtain modified bentonite;
(4) and (4) mixing the modified bentonite obtained in the step (3) with local clay sieved by a 80-mesh sieve, and fully stirring to obtain the bentonite.
Tested by a variable water head permeability test (GBT 50123--9cm/s。
The overall construction method of the 20m deep flexible waterproof curtain and the bottom sealant thereof of the embodiment is as follows:
(1) grooving: leading holes at two ends and the middle by adopting a rotary drilling rig, then digging a soil layer, a sand layer and a gravel layer between the holes by adopting a hydraulic grab, finally treating the rock layer by adopting a double-wheel groove milling machine, and pouring bentonite slurry into the groove holes to protect the walls while slotting;
(2) and (3) lowering a flexible waterproof curtain: lowering a flexible waterproof curtain (HDPE film) to a target depth by using a film lowering machine;
(3) adding the sealant and water into a stirrer, adjusting the addition amount of water to ensure that the slump of the sealant is 120mm, and stirring for 20min for later use;
(4) connecting an air compressor with an air injection pipe, and placing the air injection pipe into the bottom groove along a flexible waterproof curtain;
(5) starting an air compressor, setting the air pressure to be 0.8MPa, operating for 15min, and closing the air compressor after ensuring the repeated disturbance of the bottom and the small gravel;
(6) connecting a sealant delivery pump with a sealant injection pipe, and placing the sealant injection pipe into the bottom groove along the flexible waterproof curtain;
(7) and after the air compressor is closed, the sealant delivery pump is started, the injection pressure is set to be 20MPa, the sealant is injected, the distance between injection points of the sealant is controlled to be 3m, the thickness is controlled to be 3m, and after the injection is finished, the air injection pipe and the sealant injection pipe are extracted.
Example 3
The sealant of this example consisted of 70% by weight of modified bentonite clay and 30% by weight of local clay and was prepared as follows:
(1) adding sodium bentonite and water into a stirring tank according to the weight ratio of 1:13, and stirring to obtain sodium bentonite slurry;
(2) adding 1 wt% of polyion cellulose into the sodium bentonite slurry obtained in the step (1), heating to 70 ℃, and stirring for 7 hours by using a high-speed stirring device at the rotating speed of 1800r/min to obtain modified bentonite slurry;
(3) drying the modified bentonite slurry obtained in the step (2) for 12 hours, crushing, and sieving with a 80-mesh sieve to obtain modified bentonite;
(4) and (4) mixing the modified bentonite obtained in the step (3) with local clay sieved by a 80-mesh sieve, and fully stirring to obtain the bentonite.
Tested by a variable water head permeability test (GBT 50123--9cm/s。
The integral construction method of the 30m deep flexible waterproof curtain and the bottom sealant thereof of the embodiment is as follows:
(1) grooving: leading holes at two ends and the middle by adopting a rotary drilling rig, then digging a soil layer, a sand layer and a gravel layer between the holes by adopting a hydraulic grab, finally treating the rock layer by adopting a double-wheel groove milling machine, and pouring bentonite slurry into the groove holes to protect the walls while slotting;
(2) and (3) lowering a flexible waterproof curtain: lowering a flexible waterproof curtain (HDPE film) to a target depth by using a film lowering machine;
(3) adding the sealant and water into a stirrer, adjusting the addition amount of water to ensure that the slump of the sealant is 150mm, and stirring for 25min for later use;
(4) connecting an air compressor with an air injection pipe, and placing the air injection pipe into the bottom groove along a flexible waterproof curtain;
(5) starting an air compressor, setting the air pressure to be 0.9MPa, operating for 18min, and closing the air compressor after ensuring the repeated disturbance of the bottom and the small gravel;
(6) connecting a sealant delivery pump with a sealant injection pipe, and placing the sealant injection pipe into the bottom groove along the flexible waterproof curtain;
(7) and after the air compressor is closed, the sealant delivery pump is started, the injection pressure is set to be 25MPa, the sealant is injected, the distance between injection points of each sealant is controlled to be 2m, the thickness is controlled to be 2m, and after the injection is finished, the air injection pipe and the sealant injection pipe are extracted.
Claims (5)
1. The sealant for the bottom of the deep flexible waterproof curtain is characterized by comprising modified bentonite and clay, wherein the modified bentonite is sodium bentonite modified by polyion cellulose.
2. The sealant according to claim 1, wherein the clay is a local clay.
3. The sealant according to claim 1, wherein the sealant comprises 60 to 80% by weight of the modified bentonite clay and 20 to 40% by weight of the clay.
4. A method of making the sealant according to claim 1, comprising the steps of:
(1) adding sodium bentonite and water into a stirring tank according to the weight ratio of 1:10, and stirring to obtain sodium bentonite slurry;
(2) adding 0.5-2 wt% of polyion cellulose into the sodium bentonite slurry obtained in the step (1), heating to 60-80 ℃, and stirring for 7 hours by using a high-speed stirring device at the rotation speed of 1500-;
(3) drying the modified bentonite slurry obtained in the step (2) for 12 hours, crushing, and sieving with a 80-mesh sieve to obtain modified bentonite;
(4) and (4) mixing the modified bentonite obtained in the step (3) with clay sieved by a 80-mesh sieve, and fully stirring to obtain the bentonite.
5. A method of pouring a sealant on the bottom of a flexible waterproof curtain as claimed in claim 1, comprising the steps of:
(1) adding the sealant as claimed in claim 1 and water into a stirrer, regulating the addition amount of water to make the slump of the sealant at 120-180mm, and stirring for 20-30min for later use;
(2) connecting an air compressor with an air injection pipe, and placing the air injection pipe into the bottom groove along a flexible waterproof curtain;
(3) starting an air compressor, setting the air pressure to be 0.8-1.0MPa, operating for 15-20min, and closing the air compressor after ensuring the repeated disturbance of the bottom and the small gravel;
(4) connecting a sealant delivery pump with a sealant injection pipe, and placing the sealant injection pipe into the bottom groove along the flexible waterproof curtain;
(5) and after the air compressor is closed, starting the sealant delivery pump, setting the injection pressure to be 20-30MPa, injecting the sealant, controlling the distance between injection points of each sealant to be 1-3m and the thickness to be 1-3m, and after the injection is finished, pumping out the air injection pipe and the sealant injection pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010351541.4A CN111549810A (en) | 2020-04-28 | 2020-04-28 | Sealant for bottom of deep flexible waterproof curtain and preparation and pouring method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010351541.4A CN111549810A (en) | 2020-04-28 | 2020-04-28 | Sealant for bottom of deep flexible waterproof curtain and preparation and pouring method thereof |
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| CN112573864A (en) * | 2020-11-20 | 2021-03-30 | 中科鼎实环境工程有限公司 | Clay-based anti-seepage composite material and preparation method thereof |
| CN113106976A (en) * | 2021-05-11 | 2021-07-13 | 中科鼎实环境工程有限公司 | Movable sealant filling device and method for flexible vertical impervious wall |
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