CN112194420B - Water-dilution-resistant synchronous grouting liquid for water-rich geological shield construction and preparation method thereof - Google Patents
Water-dilution-resistant synchronous grouting liquid for water-rich geological shield construction and preparation method thereof Download PDFInfo
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- CN112194420B CN112194420B CN202010878529.9A CN202010878529A CN112194420B CN 112194420 B CN112194420 B CN 112194420B CN 202010878529 A CN202010878529 A CN 202010878529A CN 112194420 B CN112194420 B CN 112194420B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a water-dilution-resistant synchronous grouting liquid for water-rich geological shield construction and a preparation method thereof, wherein the grouting liquid comprises the following raw materials in parts by weight: 0.5 to 1 portion of silicon dioxide, 2 to 4 portions of attapulgite, 15 to 25 portions of bentonite, 30 to 40 portions of regenerated micro powder, 0.1 to 0.3 portion of water-reducing retarder, 0.05 to 0.1 portion of defoamer, 0.05 to 0.1 portion of lubricating pumping aid, 0.1 to 0.5 portion of filtrate reducer and 35 to 55 portions of water. The invention provides a water-dilution-resistant synchronous grouting liquid for water-rich geological shield construction and a complete set of technical scheme for preparation.
Description
Technical Field
The invention relates to the field of shield tunneling, in particular to a water-dilution-resistant synchronous grouting liquid for water-rich geological shield construction and a preparation method thereof.
Background
In the shield construction process, as the shield tail breaks away from the segment, a gap is generated between the segment and the stratum immediately, the size is about 2cm generally, the gap is not filled in time, the hazards of surface subsidence, segment floating and the like can be caused, and the common treatment measures are that the grouting material is synchronously injected into the gap along with the shield tail breaking away from the segment. In order to reduce the influence of synchronous grouting on a shield tail brush, inert or semi-inert synchronous grouting is often selected in engineering (the initial setting time of the grouting is usually more than 5 h). The shield construction application of the water-rich stratum shows that the newly-poured non-coagulated synchronous grouting material is very easy to be diluted by a large amount of underground water, the performance of the newly-poured non-coagulated synchronous grouting material is obviously degraded in all aspects, and adverse phenomena such as slurry pouring back a shield body, increase of surface settlement, upward floating of pipe pieces, increase of secondary grouting amount and the like are caused finally. Therefore, a proper technical scheme is sought, the problem that synchronous grouting liquid is extremely easy to dilute and degrade in water-rich geology is solved, and the method is an important measure for ensuring the shield construction quality of the water-rich geology.
Patent CN107827422B discloses a high-waterproof synchronous grouting slurry for a submarine shield tunnel, and the proposed technical scheme mainly solves the problems of seawater erosion resistance and durability of the hardened synchronous grouting slurry, and does not specify the technical measures of water dilution resistance of the newly poured non-coagulated synchronous grouting slurry; patent CN106904888B discloses a ready-mixed synchronous grouting material for shield construction with high water retention, and the implementation of the technical scheme aims at improving the water retention performance of the synchronous grouting material and increasing the calculus rate of the synchronous grouting material.
However, at present, no patent publications and literature are disclosed, and how to effectively improve the groundwater dilution resistance of the freshly poured and uncondensed synchronous grouting liquid is clear, but in the shield tunnel construction, the freshly mixed and uncondensed synchronous grouting liquid is very easy to dilute and degrade in the water-rich geology when the water-rich geology is frequently encountered, so that the problem to be solved is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing the water-resistant dilution synchronous grouting liquid for the water-rich geological shield construction, which has excellent water-resistant dilution capability and fluidity, is easy to form a high-strength mud film and has large thixotropy, and the preparation method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme: the water-diluted synchronous grouting liquid for the water-rich geological shield construction comprises the following raw materials in parts by weight: 0.5 to 1 portion of silicon dioxide, 2 to 4 portions of attapulgite, 15 to 25 portions of bentonite, 30 to 40 portions of regenerated micro powder, 0.1 to 0.3 portion of water-reducing retarder, 0.05 to 0.1 portion of defoamer, 0.05 to 0.1 portion of lubricating pumping aid, 0.1 to 0.5 portion of filtrate reducer and 35 to 55 portions of water.
Further, the specific surface area of the silicon dioxide is more than 120m 2 /g。
Further, the specific surface area of the attapulgite is more than 150m 2 The colloidal value is more than 45mL/15g.
Furthermore, the bentonite is calcium bentonite or sodium bentonite, the sieving rate of the calcium bentonite is more than 98%, and the sieving rate of the sodium bentonite is more than 95%.
Further, the regenerated micro powder is any one or a mixture of more than two of waste brick regenerated micro powder, waste concrete regenerated micro powder and stone powder mixed according to any proportion, and the specific surface area is more than 400m 2 /g。
Further, the water reducing retarder is a mixture of any one or more than two of calcium saccharate, gluconate, citric acid and lignosulfonate mixed according to any proportion.
Further, the defoamer is a polyether defoamer.
Further, the pumping lubricant is polyacrylamide or polyethylene oxide, the polyacrylamide is anionic, the average molecular weight is not more than 400 ten thousand, and the molecular weight of the polyethylene oxide is not more than 100 ten thousand.
Further, the fluid loss additive is any one or a mixture of any two or more of carboxymethyl cellulose, sulfonate copolymer, grafted starch and potassium humate which are mixed according to any proportion.
The preparation method of the water-dilution-resistant synchronous grouting liquid for the water-rich geological shield construction comprises the following steps:
(1) Taking a water-reducing retarder, a defoaming agent, a lubricating pumping agent and a fluid loss additive, adding part of water, and stirring at a stirring speed of not less than 200r/min to prepare slurry A;
(2) Adding the rest water into the silicon dioxide, the attapulgite, the bentonite and the regenerated micro powder, and stirring at a stirring speed of not less than 500r/min to prepare slurry B;
(3) And mixing the slurry A and the slurry B, and stirring to obtain the water-dilution-resistant synchronous grouting liquid for the water-rich geological shield construction.
The main technical principle of the invention is as follows:
(1) The regenerated micro powder is adopted to replace natural river sand as a skeleton supporting system of synchronous grouting liquid, the grain composition of the regenerated micro powder is scientifically designed, so that the internal skeleton of the synchronous grouting liquid is tightly stacked, the apparent density is maximum, and the calculus rate of the hardened synchronous grouting liquid is effectively increased; meanwhile, the regenerated micro powder has certain hydration activity, and can form a certain amount of cementing material after being coagulated and hardened in water, thereby completely replacing cementing components such as cement, fly ash and the like, leading the strength of the synchronously grouting liquid after being hardened to reach more than 2.5MPa, and meeting the use requirement.
(2) The regenerated micro powder has more edges and corners, which easily causes the increase of the friction resistance in the synchronous grouting liquid, and in order to increase the fluidity of the system, the invention introduces the water reducing retarder component and the lubricating pumping agent component, which can remarkably reduce the yield stress of the system and increase the fluidity and the pumpability of the system while not remarkably increasing the water consumption of the system; in order to eliminate air bubbles introduced by the water reducing retarder component and the lubricating pumping aid component, a measure of adding an antifoaming agent component is adopted.
(3) Attapulgite and bentonite absorb water and can form a large amount of micelle column structures after the swelling, increase system viscosity, promote synchronous slip casting liquid system stable, and more importantly, a large amount of micelles can form initial mud membrane structure in the consolidation of stratum surface, and the formation of mud membrane structure will effectual prevention groundwater to the infiltration of synchronous slip casting liquid.
(4) Surface area greater than 120m 2 The silicon dioxide per gram can further fill gaps in the mud film, so that the formed mud film is more compact, and the infiltration of underground water into the synchronous grouting liquid is further reduced; more importantly, the silicon dioxide auxiliary bentonite can realize thixotropic regulation and control of slurry, and the preparation method is remarkably characterized in that the prepared slurry has larger thixotropy, the viscosity of a system can be suddenly increased after the flow of the slurry stops, and the dilution of underground water on synchronous grouting liquid can be effectively prevented.
(5) The rigidity of the mud film is increased by utilizing the adsorption and connection effect of the macromolecular chains of the filtrate reducer on solid-phase particles, and the anti-burst capability of the mud film under high underground water pressure is improved.
The invention has the following beneficial effects:
(1) The large-thixotropy synchronous grouting liquid is prepared by utilizing the characteristic that large thixotropy of slurry is formed after silicon dioxide, bentonite and the like are dispersed in an aqueous solution, and has the remarkable characteristic that the viscosity of the slurry is suddenly increased after the slurry stops flowing, and the characteristic can be utilized to effectively prevent water from diluting the newly-grouted synchronous grouting liquid, thereby effectively avoiding the slurry leakage phenomenon and ensuring the synchronous grouting quality.
(2) The film forming property of bentonite, the compact filling effect of silicon dioxide and the mud film rigidity enhancing effect of the filtrate reducer are cooperatively utilized to form a compact mud film on the surface of the stratum and prevent the permeation of underground water into a tunnel, so that the problem of permeation of the underground water into newly poured synchronous grouting liquid is fundamentally solved, the synchronous grouting liquid has the water pressure erosion resistance, the shield construction quality of the stratum with pressure can be effectively improved, the ground surface settlement and shield tail gushing risks are remarkably avoided, and the applicable working condition of the inert or semi-inert synchronous grouting liquid is further expanded.
(3) By adopting the pulping idea of reducing water and retarding coagulation, the method ensures that the slurry has good fluidity, meets the basic requirement of long-distance pumping construction, greatly prolongs the pumpable time of the synchronous grouting material, reduces the difficulty of the synchronous grouting construction, reduces the deterioration phenomenon of the slurry performance caused by overlong time, and avoids the waste of a large amount of synchronous grouting liquid.
(4) A large amount of regenerated micro powder is used as aggregate and gelling components of the synchronous grouting material, so that the application of the gelling components with high energy consumption is reduced, the utilization of construction wastes is enlarged, and the environmental protection benefit is remarkable.
Detailed Description
The present invention will be further illustrated below with reference to specific embodiments, which are to be understood as merely illustrative and not limitative of the scope of the present invention.
The water-dilution-resistant synchronous grouting liquid described in the following examples adopts the formula components provided by the invention, and the raw materials used in the examples and comparative examples are all commercial products known in the art if not specifically described:
the water-dilution-resistant synchronous grouting liquid for the water-rich geological shield construction is prepared from the following raw materials in parts by weight: 0.5 to 1 portion of silicon dioxide, 2 to 4 portions of attapulgite, 15 to 25 portions of bentonite, 30 to 40 portions of regenerated micro powder, 0.1 to 0.3 portion of water-reducing retarder, 0.05 to 0.1 portion of defoamer, 0.05 to 0.1 portion of lubricating pumping aid, 0.1 to 0.5 portion of filtrate reducer and 35 to 55 portions of water.
Wherein the specific surface area of the silicon dioxide is more than 120m 2 /g。
Wherein the specific surface area of the attapulgite is more than 150m 2 The colloidal value is more than 45mL/15g.
Wherein the bentonite is calcium bentonite with a sieving rate of more than 98 percent or sodium bentonite with a sieving rate of more than 95 percent.
Wherein the regenerated micro powder is any one or a mixture of more than two of waste brick regenerated micro powder, waste concrete regenerated micro powder and stone powder mixed according to any proportion, and the specific surface area is more than 400m 2 /g。
Wherein the water reducing retarder is any one or a mixture of more than two of calcium saccharate, gluconate, citric acid and lignosulfonate mixed according to any proportion.
Wherein the defoaming agent is polyether defoaming agent.
Wherein the pumping lubricant is polyacrylamide or polyoxyethylene, the polyacrylamide is anionic, the average molecular weight is not more than 400 ten thousand, and the molecular weight of the polyoxyethylene is not more than 100 ten thousand.
Wherein the filtrate reducer is any one or a mixture of more than two of carboxymethyl cellulose, sulfonate copolymer, grafted starch and potassium humate which are mixed according to any proportion.
The water-dilution-resistant synchronous grouting liquid in the following examples and comparative examples is prepared by adopting the method provided by the patent of the invention, and the specific steps are as follows:
(1) Adding half water into the water-reducing retarder, the defoamer, the lubricating pumping aid and the fluid loss additive, and stirring at a stirring speed of not less than 200r/min to prepare slurry A;
(2) Adding the rest half water into silicon dioxide, attapulgite, bentonite and regenerated micro powder, and stirring at a stirring speed of not less than 500r/min to obtain slurry B;
(3) And mixing the slurry A and the slurry B, and stirring to obtain the water-dilution-resistant synchronous grouting liquid for the water-rich geological shield construction.
The following provides 8 examples and 5 comparative examples of the water-diluted synchronous grouting liquid for water-rich geological shield construction of the present invention, and the compositions of examples 1 to 8 and comparative examples 1 to 5 are shown in table 1:
TABLE 1 composition of water-diluted synchronous grouting liquid for water-rich geological shield construction of examples and comparative examples (unit: parts by weight)
The performance test results of the water-diluted synchronous grouting liquid for water-rich geological shield construction of examples 1-8 and comparative examples 1-5 are shown in table 2:
table 2 test results p of performance of water dilution resistant synchronous grouting liquid for water-rich geological shield construction in examples and comparative examples
Table 2 remarks illustrate: 1. the applicable consistency range of the shield synchronous grouting liquid is not more than 140mm; 2. the initial setting time suitable for the shield synchronous grouting liquid is 6-12 h; 3. the thinner and denser the mud film, the lower the filtration loss of the mud film is generally, which indicates that the synchronous grouting liquid has stronger water dilution resistance, and the filtration loss of 30min is preferably not more than 15 mL; 4. the calculus rate of the shield synchronous grouting liquid is usually not less than 95%; 5. the compressive strength of the shield synchronous grouting liquid after hardening is preferably not lower than 2.5 MPa.
It can be seen from the above that, in examples 1 to 8, the synchronous grouting liquid obtained by the present invention has various properties meeting the basic use requirements of the synchronous grouting liquid, and most importantly, has large thixotropic property and obvious water dilution resistance, and the synchronous grouting liquid provided by the present invention has been successfully applied to shield construction projects such as kunming subway No. 1 line, guiyang subway No. 3 line, guangzhou subway No. 1 line, and the like.
It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this disclosure.
Claims (7)
1. The utility model provides a rich water geology shield construction is with synchronous slip casting liquid of water-resistant dilution which characterized in that: the composite material comprises the following raw materials in parts by weight: 0.5 to 1 portion of silicon dioxide, 2 to 4 portions of attapulgite, 15 to 25 portions of bentonite, 30 to 40 portions of regenerated micro powder, 0.1 to 0.3 portion of water-reducing retarder, 0.05 to 0.1 portion of defoamer, 0.05 to 0.1 portion of lubricating pumping aid, 0.1 to 0.5 portion of filtrate reducer and 35 to 55 portions of water; the specific surface area of the silica is more than 120m 2 (iv)/g, the specific surface area of the attapulgite is more than 150m 2 The colloid value is more than 45mL/15g;
the preparation method of the slurry comprises the following steps:
(1) Taking a water-reducing retarder, a defoaming agent, a lubricating pumping agent and a fluid loss additive, adding part of water, and stirring at a stirring speed of not less than 200r/min to prepare slurry A;
(2) Taking silicon dioxide, attapulgite, bentonite and regenerated micro powder, adding the rest water, and stirring at a stirring speed of not less than 500r/min to prepare slurry B;
(3) And mixing the slurry A and the slurry B, and stirring to obtain the water-dilution-resistant synchronous grouting liquid for the water-rich geological shield construction.
2. The water-rich geological shield construction water-resistant dilution synchronous grouting liquid according to claim 1, characterized in that: the bentonite is calcium bentonite or sodium bentonite, the sieving rate of the calcium bentonite is more than 98%, and the sieving rate of the sodium bentonite is more than 95%.
3. The water-rich geological shield construction water-resistant dilution synchronous grouting liquid as claimed in claim 1 or 2, characterized in that: the regenerated micro powder is any one or a mixture of more than two of waste brick regenerated micro powder, waste concrete regenerated micro powder and stone powder mixed according to any proportion.
4. The water-rich geological shield construction water-resistant dilution synchronous grouting liquid as claimed in claim 1 or 2, characterized in that: the water reducing retarder is any one or a mixture of more than two of calcium saccharate, gluconate, citric acid and lignosulfonate mixed according to any proportion.
5. The water-rich geological shield construction water-resistant dilution synchronous grouting liquid as claimed in claim 1 or 2, characterized in that: the defoaming agent is polyether defoaming agent.
6. The water-rich geological shield construction water-dilution-resistant synchronous grouting liquid as claimed in claim 1 or 2, characterized in that: the lubricating pumping agent is polyacrylamide or polyoxyethylene, the polyacrylamide is anionic, the average molecular weight is not more than 400 ten thousand, and the molecular weight of the polyoxyethylene is not more than 100 ten thousand.
7. The water-rich geological shield construction water-resistant dilution synchronous grouting liquid as claimed in claim 1 or 2, characterized in that: the filtrate reducer is any one or a mixture of more than two of carboxymethyl cellulose, sulfonate copolymer, grafted starch and potassium humate which are mixed according to any proportion.
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| CN110498633A (en) * | 2019-08-14 | 2019-11-26 | 中交武汉港湾工程设计研究院有限公司 | Shield synchronization slip casting Material cladding additive |
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| KR100900597B1 (en) * | 2007-10-22 | 2009-06-02 | 서울산업대학교 산학협력단 | Inserting Material for Tunnel Cavity using discarded concrete micro-sized powder and testing device |
| CN103342527B (en) * | 2013-07-29 | 2015-04-08 | 武汉理工大学 | Waste concrete reclaimed tunnel back lining grouting material and preparation method thereof |
| CN106082942A (en) * | 2016-06-15 | 2016-11-09 | 浙江广天构件股份有限公司 | Shield-tunneling construction grouting serous fluid |
| CN107827422B (en) * | 2017-11-24 | 2020-07-17 | 中铁隧道局集团有限公司 | High-waterproof synchronous grouting slurry for submarine shield tunnel |
| CN109519196A (en) * | 2018-11-30 | 2019-03-26 | 中铁隧道集团二处有限公司 | The slurries stable for shield face in compound stratum |
| CN109762534A (en) * | 2019-01-30 | 2019-05-17 | 中国地质大学（武汉） | One kind being suitable for large diameter tunneling shield mud system and preparation method |
| CN110510958A (en) * | 2019-09-27 | 2019-11-29 | 杭州临安正翔建材有限公司 | A kind of subway filling mortar based on building waste |
| CN111022064B (en) * | 2020-01-01 | 2021-04-09 | 中铁四局集团有限公司 | Mud sinking prevention and grouting slurry for shield construction |
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| CN110498633A (en) * | 2019-08-14 | 2019-11-26 | 中交武汉港湾工程设计研究院有限公司 | Shield synchronization slip casting Material cladding additive |
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