CN113137237A - Soil body modifier for weakening gushing of shield in water-rich sand layer and preparation and application thereof - Google Patents
Soil body modifier for weakening gushing of shield in water-rich sand layer and preparation and application thereof Download PDFInfo
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- CN113137237A CN113137237A CN202110397819.6A CN202110397819A CN113137237A CN 113137237 A CN113137237 A CN 113137237A CN 202110397819 A CN202110397819 A CN 202110397819A CN 113137237 A CN113137237 A CN 113137237A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 239000002689 soil Substances 0.000 title claims abstract description 38
- 239000004576 sand Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000003607 modifier Substances 0.000 title claims abstract description 15
- 230000003313 weakening effect Effects 0.000 title claims abstract description 13
- 239000000243 solution Substances 0.000 claims description 82
- 239000000440 bentonite Substances 0.000 claims description 27
- 229910000278 bentonite Inorganic materials 0.000 claims description 27
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 27
- 238000003756 stirring Methods 0.000 claims description 20
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 16
- 229920002907 Guar gum Polymers 0.000 claims description 16
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 16
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 16
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 16
- 239000000665 guar gum Substances 0.000 claims description 16
- 229960002154 guar gum Drugs 0.000 claims description 16
- 235000010417 guar gum Nutrition 0.000 claims description 16
- 229920002401 polyacrylamide Polymers 0.000 claims description 15
- 230000005641 tunneling Effects 0.000 claims description 13
- 238000005187 foaming Methods 0.000 claims description 9
- 239000004088 foaming agent Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000011550 stock solution Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000004927 fusion Effects 0.000 claims description 3
- 239000002364 soil amendment Substances 0.000 claims 5
- 238000004090 dissolution Methods 0.000 claims 1
- 239000003516 soil conditioner Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 description 13
- 239000003795 chemical substances by application Substances 0.000 description 9
- 230000006872 improvement Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000003349 gelling agent Substances 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
- C09K17/18—Prepolymers; Macromolecular compounds
- C09K17/32—Prepolymers; Macromolecular compounds of natural origin, e.g. cellulosic materials
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2103/00—Civil engineering use
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a soil body modifier for weakening gushing of a shield in a water-rich sand layer, and a preparation method and application thereof.
Description
Technical Field
The invention belongs to the technical field of civil building materials and underground engineering, and particularly relates to a soil body modifier for weakening gushing of a shield in a water-rich sand layer, and preparation and application thereof.
Background
With the rapid development of subway construction in China, the quantity of underground tunnel engineering is increasing day by day, and as the shield method has the advantages of small floor area, stable and rapid construction progress, simple and convenient operation and the like in tunnel construction, the shield method is widely applied to subway engineering, wherein the shield machine with earth pressure balance is most widely applied.
During the tunneling of the earth pressure balance shield machine on a water-rich sand layer, a gushing phenomenon easily occurs when the screw conveyor discharges dregs, on one hand, the soil output is out of control, and further, an over-excavation phenomenon occurs, and the safety quality of shield construction is influenced; on the other hand, the gushing causes safe and civilized construction of a construction area in the shield tunneling machine and influences the construction progress. However, the stratum is ubiquitous in the southeast coastal city and is a great technical problem in the construction of the earth pressure balance shield machine.
Disclosure of Invention
The invention aims to provide a soil body modifier for weakening gushing of a shield in a water-rich sand layer, which is used for modifying water-rich sandy soil in a soil bin of a shield machine in the construction process of a soil pressure balance shield machine, reducing the water permeability of the soil and improving the fluidity of the soil, thereby weakening the frequency and scale of gushing of a screw conveyor and realizing safe and rapid construction of the soil pressure balance shield machine.
Therefore, the technical scheme adopted by the invention is as follows: a soil body modifying agent for weakening gushing of a shield in a water-rich sand layer comprises a solution A and a solution B, wherein the solution A comprises water and polyacrylamide, and the solution B comprises water, guar gum and carboxymethyl cellulose.
The modifier formula adopted in practice is adjusted according to the difference of the water content of the water-rich sand layer, and when the water content of the sand layer is 30-40%, the solution A comprises the following components in parts by weight: 1-2 parts of polyacrylamide and 98-99 parts of water; the solution B comprises the following components in parts by weight: 0.5-1 part of guar gum, 0.5-1 part of carboxymethyl cellulose and 98-99 parts of water.
When the water content of the sand layer is more than 40%, the solution A comprises the following components in parts by weight: 3-4 parts of polyacrylamide and 96-97 parts of water; the solution B comprises the following components in parts by weight: 1-2 parts of guar gum, 1-2 parts of carboxymethyl cellulose and 96-98 parts of water.
When the water content of the sand layer is below 30%, the solution A comprises the following components in parts by weight: 0.5-1 part of polyacrylamide and 99-99.5 parts of water; the solution B comprises the following components in parts by weight: 0.3-0.5 part of guar gum, 0.3-0.5 part of carboxymethyl cellulose and 99-99.6 parts of water.
Therefore, the invention also provides a preparation method of the soil improvement agent, which comprises the preparation of the solution A and the preparation of the solution B, wherein the preparation method of the solution A comprises the following steps: dissolving polyacrylamide in water according to the parts by weight; the preparation of the solution B comprises the following steps: guar gum and carboxymethyl cellulose were dissolved in water in the above parts by weight.
Wherein, the temperature of water is 45 ℃ when the solution B is prepared, and stirring is needed for 15min when the solution B is dissolved.
Therefore, the invention also provides an application of the soil improvement agent, which comprises the following steps:
s1: stirring, namely mixing the solution A into the foam stock solution, stirring, and foaming in a foaming system to obtain a foaming agent; stirring the solution B with bentonite in a bentonite box body;
s2: injecting, namely injecting a foaming agent containing the solution A into the tunnel face and the soil bin of the shield tunneling machine through a foaming system; injecting bentonite with the solution B into the tunnel face and the soil bin of the shield tunneling machine through a bentonite system;
s3: and (3) reacting, namely injecting a foaming agent containing the solution A and bentonite with the solution B, performing fusion reaction on the solution A and the solution B by utilizing the rotation of a cutter head, and stopping the propelling and the unearthing of the shield tunneling machine in the stirring process of the cutter head.
Wherein, in the step S1, the weight ratio of the solution A to the foam stock solution is 10 percent; the B solution accounts for 5% of the bentonite slurry, the bentonite slurry is prepared by adding water into bentonite and stirring, and the bentonite accounts for 20% of the water.
Wherein the volume ratio of the solution A to the solution B used in step S1 is 1: 1.
Wherein the time for the rotation stirring of the cutter in step S3 is 2 min.
The invention has the beneficial effects that:
1) according to the soil body modifier, polyacrylamide is used as a flocculating agent, guar gum and carboxymethyl cellulose are used as a gelling agent and a thickening agent, a high polymer can be formed, the strong water permeability of a water-rich sand layer is improved, the gushing scale and times of a soil pressure balance shield machine under the geology of the water-rich sand layer are weakened, and the construction safety and progress are improved;
2) the soil modifier is liquid, is easily dissolved in slurry related to construction of various soil pressure balance shield machines, and can not cause pipe blockage;
3) the soil modifier provided by the invention takes polyacrylamide as a polymerization raw material, guar gum and carboxymethyl cellulose as a bridging agent, insoluble polymer colloid is formed in a water-rich sand layer, the guar gum and the carboxymethyl cellulose are used, the reaction time can be effectively reduced, the cost is reduced, the agglomeration effect of the polymer colloid is good, high water pressure can be resisted, the 28-day biodegradability reaches more than 85%, the OECD water biotoxicity index is met, the environment is protected, and groundwater pollution cannot be caused.
Drawings
FIG. 1 is a schematic view of the preparation and application process of the soil modifier of the invention.
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:
example 1
A soil body modifying agent for weakening gushing of a shield in a water-rich sand layer comprises a solution A and a solution B, wherein the solution A is formed by dissolving 1-2 parts by weight of polyacrylamide in 98-99 parts by weight of water, the solution B is formed by dissolving 0.5-1 part by weight of guar gum and 0.5-1 part by weight of carboxymethyl cellulose in 98-99 parts by weight of water, the water temperature is 45 ℃, and the solution B is stirred for 15 min.
Example 2
A soil body modifying agent for weakening gushing of a shield in a water-rich sand layer comprises a solution A and a solution B, wherein the solution A is formed by dissolving 3-4 parts by weight of polyacrylamide in 96-97 parts by weight of water, the solution B is formed by dissolving 1-2 parts by weight of guar gum and 1-2 parts by weight of carboxymethyl cellulose in 96-98 parts by weight of water, the water temperature is 45 ℃, and the solution B is stirred for 15 min.
Example 3
A soil body modifying agent for weakening gushing of a shield in a water-rich sand layer comprises a solution A and a solution B, wherein the solution A is formed by dissolving 0.5-1 part by weight of polyacrylamide in 99-99.5 parts by weight of water, the solution B is formed by dissolving 0.3-0.5 part by weight of guar gum and 0.3-0.5 part by weight of carboxymethyl cellulose in 99-99.6 parts by weight of water, the water temperature is 45 ℃, and the solution B is stirred for 15 min.
The soil improvement agent prepared in the above examples 1 to 3 was subjected to an improvement test (soil condition: full-face water-rich sand layer), wherein the improvement test specifically comprises the steps of:
step 1: stirring, namely mixing the solution A into the foam stock solution, stirring, and foaming in a foaming system to obtain a foaming agent, wherein the solution A accounts for 10% of the weight of the foam stock solution; stirring the solution B and bentonite in a bentonite box body, wherein the solution B accounts for 5% of the weight of bentonite slurry, the concentration of the bentonite slurry is formed by adding water into the bentonite and stirring, and the bentonite accounts for 20% of the weight of the water; the volume ratio of the solution A to the solution B used each time is 1: 1;
step 2: injecting, namely injecting a foaming agent containing the solution A into the tunnel face and the soil bin of the shield tunneling machine through a foaming system; injecting bentonite with the solution B into the tunnel face and the soil bin of the shield tunneling machine through a bentonite system;
and step 3: and (3) reacting, namely injecting a foaming agent containing the solution A and bentonite with the solution B, performing fusion reaction on the solution A and the solution B by utilizing the rotation of a cutter head, stopping the propelling and the unearthing of the shield tunneling machine in the stirring process of the cutter head, and stirring for 2min by the cutter head.
In the test process, the shape of the discharged muck when different soil body modifying agents are used is recorded, and the obtained test result is as follows:
the soil body modifier prepared by the invention has good gushing prevention effect on the water-rich sand layer, can not cause the mud cake phenomenon of a cutter head of a shield tunneling machine, has short modification time, has very obvious effect on the shield tunneling in the driving construction of the water-rich sand layer, and promotes the development of engineering technology.
Claims (10)
1. The utility model provides a weaken shield structure at soil body modifier of rich water sand bed gushing which characterized in that: the solution A and the solution B are included, the components of the solution A include water and polyacrylamide, and the components of the solution B include water, guar gum and carboxymethyl cellulose.
2. The soil body modifier for weakening the gushing of the shield in the water-rich sand layer according to claim 1, wherein the solution A comprises the following components in parts by weight: 1-2 parts of polyacrylamide and 98-99 parts of water; the solution B comprises the following components in parts by weight: 0.5-1 part of guar gum, 0.5-1 part of carboxymethyl cellulose and 98-99 parts of water.
3. The soil body modifier for weakening the gushing of the shield in the water-rich sand layer according to claim 1, wherein the solution A comprises the following components in parts by weight: 3-4 parts of polyacrylamide and 96-97 parts of water; the solution B comprises the following components in parts by weight: 1-2 parts of guar gum, 1-2 parts of carboxymethyl cellulose and 96-98 parts of water.
4. The soil body modifier for weakening the gushing of the shield in the water-rich sand layer according to claim 1, wherein the solution A comprises the following components in parts by weight: 0.5-1 part of polyacrylamide and 99-99.5 parts of water; the solution B comprises the following components in parts by weight: 0.3-0.5 part of guar gum, 0.3-0.5 part of carboxymethyl cellulose and 99-99.6 parts of water.
5. The soil conditioner preparation method of any one of claims 2 to 4, comprising the preparation of solution A and the preparation of solution B, wherein the preparation of solution A is as follows: dissolving polyacrylamide in water according to parts by weight; the preparation of the solution B comprises the following steps: guar gum and carboxymethyl cellulose were dissolved in water in parts by weight.
6. The soil amendment of claim 5, wherein: the temperature of water in the preparation method of the solution B is 45 ℃, and stirring is required for 15min during dissolution.
7. Use of a soil amendment according to any of claims 2 to 4, comprising the steps of:
s1: stirring, namely mixing the solution A into the foam stock solution, stirring, and foaming in a foaming system to obtain a foaming agent; stirring the solution B with bentonite in a bentonite box body;
s2: injecting, namely injecting a foaming agent containing the solution A into the tunnel face and the soil bin of the shield tunneling machine through a foaming system; injecting bentonite with the solution B into the tunnel face and the soil bin of the shield tunneling machine through a bentonite system;
s3: and (3) reacting, namely injecting a foaming agent containing the solution A and bentonite with the solution B, performing fusion reaction on the solution A and the solution B by utilizing the rotation of a cutter head, and stopping the propelling and the unearthing of the shield tunneling machine in the stirring process of the cutter head.
8. The use of a soil amendment according to claim 7, wherein: in step S1, the weight ratio of the solution A to the foam stock solution is 10%; the B solution accounts for 5% of the bentonite slurry, the bentonite slurry is prepared by adding water into bentonite and stirring, and the bentonite accounts for 20% of the water.
9. The use of a soil amendment according to claim 7, wherein: the volume ratio of the solution a to the solution B used in step S1 was 1: 1.
10. The use of a soil amendment according to claim 7, wherein: the time for the rotation stirring of the cutter blade in step S3 was 2 min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110397819.6A CN113137237A (en) | 2021-04-14 | 2021-04-14 | Soil body modifier for weakening gushing of shield in water-rich sand layer and preparation and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110397819.6A CN113137237A (en) | 2021-04-14 | 2021-04-14 | Soil body modifier for weakening gushing of shield in water-rich sand layer and preparation and application thereof |
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| CN202110397819.6A Pending CN113137237A (en) | 2021-04-14 | 2021-04-14 | Soil body modifier for weakening gushing of shield in water-rich sand layer and preparation and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113756833A (en) * | 2021-09-26 | 2021-12-07 | 中交第三航务工程局有限公司 | Method for preventing spiral conveyor of earth pressure balance shield machine from gushing |
| CN114456812A (en) * | 2022-01-07 | 2022-05-10 | 福州大学 | Method for preparing sandy soil muck modifier by using cohesive soil muck with granite residual soil, muck modifier and using method |
| CN114455917A (en) * | 2022-02-28 | 2022-05-10 | 北京华阳众信建材有限公司 | Corrosion-resistant mortar and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113756833A (en) * | 2021-09-26 | 2021-12-07 | 中交第三航务工程局有限公司 | Method for preventing spiral conveyor of earth pressure balance shield machine from gushing |
| CN114456812A (en) * | 2022-01-07 | 2022-05-10 | 福州大学 | Method for preparing sandy soil muck modifier by using cohesive soil muck with granite residual soil, muck modifier and using method |
| CN114455917A (en) * | 2022-02-28 | 2022-05-10 | 北京华阳众信建材有限公司 | Corrosion-resistant mortar and preparation method thereof |
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