A quick-setting anti-dispersion synchronous grouting material, a preparation method and application thereof

Abstract

The application discloses a quick-setting anti-dispersion synchronous grouting material and a preparation method and application thereof, and belongs to the field of synchronous grouting materials for shield tunnels. The synchronous grouting material is prepared from the following raw materials in parts by weight: a cementing matrix material 1330-1680 parts, water 450-550 parts, water glass 140-180 parts, a composite anti-dispersing agent 8.3-14.2 parts, a composite early strength agent 20.2-31.4 parts and a composite rheological control agent 10-16 parts. The synchronous grouting material has the characteristics of short setting time, excellent mechanical and anti-permeation properties and good water dispersion resistance, realizes solid waste resource utilization, can be used as a synchronous grouting material for shield tunnels in water-rich soft strata, and effectively guarantees the service safety of the tunnels.

Description

Technical Field

[0001] This invention relates to the field of synchronous grouting materials for shield tunnels, and in particular to a rapid-setting, anti-dispersion synchronous grouting material, its preparation method, and its application. Background Technology

[0002] The information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Various types of adverse geological conditions are frequently encountered during tunnel and underground engineering construction. Among them, water-rich soft strata, characterized by poor self-stability, high permeability, and sensitivity to disturbance, have become one of the most frequently occurring adverse geological types. The shield tunneling method, through fully mechanized and closed excavation, can achieve functions such as excavation face stability control, immediate support, and shield shell protection. For example, the common earth pressure shield tunneling system controls the excavation speed of the screw conveyor and the advance speed of the cutterhead to create a certain pressure in the sealed chamber, maintaining a dynamic balance with the water and soil pressure in front of the excavation face. This solves the problems of excavation face instability and water and sand inrush caused by poor stratum self-stability and water abundance. Therefore, the shield tunneling method has become a safe, reliable construction method with minimal impact on the surrounding environment for dealing with water-rich soft strata.

[0004] During shield tunneling, synchronous grouting is necessary to fill the shield tail gap in a timely manner. Due to the extremely poor stability, abundant groundwater, and stringent requirements for settlement control in water-rich, soft strata, traditional single-component cement-based synchronous grouting materials are poorly suited for such projects. The core reasons are the material's long setting time, poor resistance to water dispersion, and insufficient impermeability and mechanical properties. Before the material reaches sufficient strength in water-rich, soft strata, it is often dispersed, diluted, and lost by groundwater, leading to low backfill rates behind the tunnel segments, insufficient support for the segments, and deterioration of grout properties. This, in turn, causes a series of disasters such as segment misalignment, deformation, cracking, and water leakage. Therefore, the development and application of synchronous grouting materials suitable for shield tunnels in water-rich, soft strata are urgently needed. Summary of the Invention

[0005] In view of this, the present invention provides a fast-setting and anti-dispersion synchronous grouting material, its preparation method and application. The synchronous grouting material has the characteristics of short setting time, excellent mechanical and impermeability properties, and good water dispersion resistance. It is beneficial to improve the compactness of the backfill behind the tunnel segment wall and the long-term working performance of the filling layer, improve the material's support stability for the tunnel segment, reduce the occurrence of disasters such as segment misalignment, deformation, cracking and water leakage, and ensure the long-term service safety of the tunnel.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: In one aspect, a fast-setting, anti-dispersion synchronous grouting material is provided, which is composed of the following raw materials in parts by weight: 1330-1680 parts of cementitious matrix material, 450-550 parts of water, 140-180 parts of water glass, 8.3-14.2 parts of composite anti-dispersion agent, 20.2-31.4 parts of composite early strength agent and 10-16 parts of composite rheology modifier; The cementitious matrix material includes 460-540 parts of silicate cement, 25-35 parts of bentonite, 70-100 parts of mineral powder, 160-200 parts of fly ash, 40-70 parts of desulfurized gypsum, 35-55 parts of calcined coal gangue powder, 120-180 parts of slag, and 420-500 parts of shield tunnel slag. The composite anti-dispersant comprises 2-4 parts polyacrylamide, 0.8-1.2 parts agar, 2-3 parts xanthan gum, 0.5-1 parts sodium polyacrylate, and 3-5 parts modified hydroxyethyl methyl cellulose ether; The composite early strength agent comprises 0.2-0.4 parts of triethanolamine, 3-5 parts of sodium sulfate, 2-3 parts of calcium formate, 8-12 parts of sodium aluminate, and 7-11 parts of sodium carbonate; The composite rheology modifier comprises 5-7 parts of polyether polyol, 2-4 parts of melamine water-reducing agent, and 3-5 parts of polycarboxylate water-reducing agent.

[0007] Preferably, the average particle size of the silicate cement is not higher than 30 μm; The bentonite is sodium-based bentonite with an expansion ratio of 20-30 times. The specific surface area of ​​the mineral powder, fly ash, desulfurized gypsum, and calcined coal gangue powder is ≥450m². 2 / kg, preferably 500m 2 / kg; The slag has a sulfide and sulfate content of ≤2.0% and a moisture content of ≤5%. The fineness modulus of the tunnel boring machine excavated soil is 2.5-3.0, and the moisture content is ≤25%.

[0008] Preferably, the modulus of the water glass is 2.0-2.8, more preferably 2.4, and the Baume degree of the water glass is 35-45°Bé, more preferably 40°Bé.

[0009] Preferably, the polyacrylamide is anionic polyacrylamide with a molecular weight of 6 million to 12 million. The particle size of the agar and xanthan gum is 80-100 mesh; The viscosity of the modified hydroxyethyl methyl cellulose ether is not less than 150,000 mPa·s.

[0010] Preferably, the molecular weight of the polyether polyol is between 400 and 2000.

[0011] Secondly, the present invention provides a method for preparing the above-mentioned rapid-setting, anti-dispersion synchronous grouting material, comprising: (1) Silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, shield tunnel slag, water, triethanolamine, sodium sulfate, calcium formate, sodium aluminate, sodium carbonate, melamine water-reducing agent and polycarboxylate water-reducing agent are mixed evenly to obtain synchronous grouting material A liquid; (2) Mix water glass, polyether polyol, polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether and heat and stir evenly to obtain synchronous grouting material B liquid; (3) Mix and stir the synchronous grouting material A liquid and synchronous grouting material B liquid to obtain a fast-setting and anti-dispersion synchronous grouting material.

[0012] Preferably, in step (1), the stirring speed is 200-300 rpm and the stirring time is 3-8 min.

[0013] Preferably, in step (2), the heating temperature is 60-80℃.

[0014] Preferably, in step (2), the stirring speed is 50-100 rpm and the stirring time is 10-20 min.

[0015] Thirdly, the present invention provides the application of the above-mentioned fast-setting and anti-dispersion synchronous grouting material in synchronous grouting of shield tunnels in water-rich and soft strata.

[0016] Compared with the prior art, the present invention has achieved the following beneficial effects: (1) The fast-setting and anti-dispersion synchronous grouting material prepared by the present invention forms a binary composite cementitious system with silicate cement and water glass in the cementitious matrix material. Cement hydration provides basic strength, and water glass provides an alkaline environment to activate the pozzolanic activity of solid waste admixtures such as mineral powder, fly ash, desulfurized gypsum, and calcined coal gangue powder in the cementitious matrix material, and also serves as a fast-setting component to accelerate setting. Triethanolamine, sodium sulfate, calcium formate, sodium aluminate, and sodium carbonate in the composite early strength agent shorten the setting time of the material and enhance the density of the microstructure of the material through multiple pathways such as accelerating cement hydration, generating ettringite, catalyzing CSH nucleation, providing aluminate, and increasing pH value. They also enhance the mechanical properties and impermeability of the material. Specifically, the synchronous grouting material prepared by this invention has a flowability ≥20cm, consistency ≥11cm, initial setting time ≥1h (2h ≥ 1h), anti-seepage pressure ≥0.6MPa (28d), compressive strength ≥1.25MPa, 2.5MPa and 4MPa (12h, 1d and 3d respectively), dynamic water retention rate ≥90%, and water-land strength ratio ≥85% (28d).

[0017] (2) This invention introduces a composite anti-dispersant agent composed of polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether, combined with a composite rheology modifier of polyether polyol, melamine water-reducing agent and polycarboxylate water-reducing agent, so that the material has excellent anti-dispersibility and flow diffusion properties. Among them, the synergistic and complementary reaction of the five components in the composite anti-dispersant agent, xanthan gum and modified hydroxyethyl methyl cellulose ether provide slurry viscosity on a macroscopic level by thickening, while the flocculation of polyacrylamide and the gel network of agar block particles on a microscopic level. At the same time, the water absorption of sodium polyacrylate and the water retention of modified hydroxyethyl methyl cellulose ether can synergistically reduce free water, improve the cohesion of the slurry and its stability in water, and jointly endow the material with good anti-dispersibility properties, so that the material has a dynamic water retention rate of ≥90% and a 28-day water-land strength ratio of ≥85%, effectively resisting groundwater erosion. The composite rheology modifier works synergistically with polyether polyol and two water-reducing agents. The polyether polyol regulates rheology by increasing the solubility of the composite anti-dispersant and improves the uniformity of the system. The two water-reducing agents improve the fluidity of the slurry through electrostatic repulsion and steric hindrance, respectively. Together, they ensure the rheological properties of the slurry, which is beneficial to improving the compactness of the backfill behind the tunnel segment wall and the long-term working performance of the filling layer. This reduces the occurrence of disasters such as segment misalignment, deformation, cracking and water leakage, and ensures the long-term service safety of the tunnel.

[0018] (3) The material of the present invention realizes the resource utilization of mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag and shield tunnel slag, which is conducive to improving the economic efficiency and environmental protection and low carbon emissions of the project. Detailed Implementation

[0019] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0020] This invention provides a fast-setting, anti-dispersion synchronous grouting material, which is composed of the following raw materials in parts by weight: 1330-1680 parts of cementitious matrix material, 450-550 parts of water, 140-180 parts of water glass, 8.3-14.2 parts of composite anti-dispersion agent, 20.2-31.4 parts of composite early strength agent, and 10-16 parts of composite rheology modifier; The cementitious matrix material includes 460-540 parts of silicate cement, 25-35 parts of bentonite, 70-100 parts of mineral powder, 160-200 parts of fly ash, 40-70 parts of desulfurized gypsum, 35-55 parts of calcined coal gangue powder, 120-180 parts of slag, and 420-500 parts of shield tunnel slag. The composite anti-dispersant comprises 2-4 parts polyacrylamide, 0.8-1.2 parts agar, 2-3 parts xanthan gum, 0.5-1 parts sodium polyacrylate, and 3-5 parts modified hydroxyethyl methyl cellulose ether; The composite early strength agent comprises 0.2-0.4 parts of triethanolamine, 3-5 parts of sodium sulfate, 2-3 parts of calcium formate, 8-12 parts of sodium aluminate, and 7-11 parts of sodium carbonate; The composite rheology modifier comprises 5-7 parts of polyether polyol, 2-4 parts of melamine water-reducing agent, and 3-5 parts of polycarboxylate water-reducing agent.

[0021] This invention uses silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, and shield tunnel slag as the cementitious matrix material and aggregate, and water glass as the quick-setting agent and alkali activator of the system. Silicate cement is the main cementitious material in the synchronous grouting material of this invention. Its hydration produces CSH gel, which provides core mechanical strength and is the main material for grout structure formation. It is also the core component for regulating quick-setting when combined with water glass. Bentonite can swell upon contact with water and form a dense colloid, effectively sealing pores, improving the impermeability of the grout, and giving the grout good water retention and stability. The active glassy body of mineral powder can react with cement hydration products to generate more CSH gel, refining the pore structure, thereby simultaneously enhancing later-stage strength and impermeability. The spherical glassy body of fly ash can exert a ball-bead effect to improve fluidity and fill pores through later pozzolanic reaction, improving the long-term density and impermeability of the material. Sulfurized gypsum promotes the secondary hydration reaction of mineral powder and fly ash by providing sulfate ions, and contributes to early strength and later density. Calcined coal gangue powder has pozzolanic activity after calcination, which can participate in the reaction and fill the internal micropores, helping to improve the mechanical properties and impermeability of the slurry. Slag, as an aggregate with certain activity, can play the role of aggregate filling, optimize material gradation, help improve the density and strength of the slurry, and provide a certain skeleton support when the material has not yet formed strength. Shield tunneling slag is mainly used as filling aggregate and to adjust the consistency of the slurry. After combining with active components, it can form an integral structure, and at the same time, it can realize the effective utilization and economical disposal of shield tunneling slag. Through the synergistic and complementary reactions of the eight components mentioned above, cement, mineral powder, fly ash, gypsum, and calcined coal gangue powder constitute a composite cementitious system. Through hierarchical hydration reactions and activation, dense hydration products are synergistically generated, constructing the core framework strength of the stone body and significantly optimizing the internal pore structure. Bentonite, slag, and tunnel boring machine excavation soil mainly play a physical filling and modification role in the system, ensuring the long-term stability and impermeability of the slurry while controlling costs. Simultaneously, the alkalinity provided by water glass creates conditions for the alkaline-activated reaction of the aforementioned aluminosilicate minerals, which is conducive to promoting the formation of highly stable three-dimensional network aluminosilicate gel and improving the long-term durability of the material.

[0022] Furthermore, this invention employs a composite anti-dispersant composed of polyacrylamide, agar, xanthan gum, sodium polyacrylate, and modified hydroxyethyl methyl cellulose ether to synergistically improve the water-dispersibility properties of the synchronous grouting material. The long molecular chains of polyacrylamide can capture solid particles in water through bridging adsorption, forming flocs and effectively preventing the slurry from being washed away when it comes into contact with water. Agar can form a robust three-dimensional thermally reversible gel network, locking in free water and encapsulating solid particles, thereby preventing them from dissolving into water. Xanthan gum has high pseudoplasticity and strong thickening effect, which can increase the viscosity of the aqueous phase in a short time, forming a viscous barrier, thereby inhibiting the mixing and exchange of substances between the slurry and external water. Sodium polyacrylate can absorb a lot of water and swell into a gel, which reduces the free water in the material to a certain extent, increases the viscosity and cohesion of the material, and hinders the precipitation of solid particles and the exchange of water. Hydroxyethyl methyl cellulose ether, after being modified by aldehyde crosslinking, can avoid clumping when it comes into contact with water, achieve uniform dispersion and efficient dissolution, and at the same time, the acetal crosslinking structure can enhance the water resistance and adhesion of the product, making it have a more stable thickening and water retention effect in cement and other cementitious materials. Through the synergistic and complementary reactions of the above five components, xanthan gum and modified hydroxyethyl methyl cellulose ether provide macroscopic slurry viscosity by thickening, while the flocculation of polyacrylamide and the gel network of agar block particles microscopically. At the same time, the water absorption of sodium polyacrylate and the water retention of modified hydroxyethyl methyl cellulose ether can synergistically reduce free water, improve the cohesion of the slurry and its stability in water. The above composite anti-dispersant agents together endow the material with good anti-water dispersion properties.

[0023] Furthermore, to further improve the early mechanical properties of the synchronous grouting material and enable it to support the pipe segments shortly after filling, this invention employs a composite early-strength agent composed of triethanolamine, sodium sulfate, calcium formate, sodium aluminate, and sodium carbonate to enhance the early strength of the material. Triethanolamine, as a surfactant, accelerates the hydration of tricalcium aluminate in cement and promotes the dissolution of silicate minerals, thereby accelerating the hydration reaction rate. The sulfate ions provided by sodium sulfate react with Ca(OH)₂ and tricalcium aluminate produced during cement hydration to form ettringite, thus improving the early strength of the material. Calcium formate directly nucleates and catalyzes the formation of CSH gel, accelerating the hydration reaction of tricalcium silicate and directly contributing to the development of early strength. Sodium aluminate directly introduces aluminate and alkali into the system, reacting quickly with calcium ions to form hydrated calcium aluminate and ettringite, rapidly establishing the early strength structure. Sodium carbonate increases the pH value of the grout, stimulating the hydration activity of active components such as mineral powder and fly ash in the early stages of the reaction, thereby achieving strength growth. Through the synergistic and complementary effects of the above five components, sodium carbonate and triethanolamine together provide a highly alkaline reaction environment, accelerating the hydration reaction of the gel particles. Meanwhile, sodium sulfate, calcium formate, and sodium aluminate provide diverse and complementary early crystalline phases by generating ettringite, catalyzing CSH, and forming aluminate structures, respectively. These phases cross-nucleate and intertwine to jointly construct a dense and strong early framework.

[0024] Furthermore, to improve the flow and diffusion properties and uniformity of the material, this invention employs a composite rheology modifier composed of polyether polyol, melamine water-reducing agent, and polycarboxylate water-reducing agent to improve the operability of the synchronous grouting material. The ether bonds and hydroxyl groups in the polyether polyol molecule can form hydrogen bonds with the polar groups in polyacrylamide, agar, xanthan gum, sodium polyacrylate, and modified hydroxyethyl methyl cellulose ether, penetrating and weakening the interactions between polymer chains, accelerating the penetration of water molecules into the particle interior during the initial dissolution phase. Simultaneously, the polyether polyol acts as a separator and plasticizer during the dissolution process of polyacrylamide, agar, xanthan gum, sodium polyacrylate, and modified hydroxyethyl methyl cellulose ether, competitively binding with water and polymer chains through hydrogen bonds, preventing excessive entanglement between polymer chains, thereby reducing solution viscosity and promoting uniform dissolution. The melamine water-reducing agent can adsorb onto the surface of cement and solid waste particles and generate strong electrostatic repulsion, thereby releasing the water trapped in the flocculated structure and improving the fluidity of the grout. Polycarboxylate superplasticizers adsorb onto the particle surface through functional groups on their main chain. The steric hindrance effect of their comb-like molecular structure prevents cement particles from approaching each other, achieving excellent flowability and slump retention even at extremely low dosages. Through the synergistic and complementary effects of these three components, polyether polyols improve system homogeneity by disrupting polymer entanglement, while melamine and polycarboxylate superplasticizers reduce the material's water demand through electrostatic repulsion and steric hindrance effects, respectively. Together, they ensure excellent and stable flowability and homogeneity of the slurry.

[0025] In an optional embodiment of the present invention, the average particle size of the silicate cement is not higher than 30 μm; The bentonite is sodium-based bentonite with an expansion ratio of 20-30 times. The specific surface area of ​​the mineral powder, fly ash, desulfurized gypsum, and calcined coal gangue powder is ≥450m². 2 / kg, preferably 500m 2 / kg; The slag has a sulfide and sulfate content of ≤2.0% and a moisture content of ≤5%. The fineness modulus of the tunnel boring machine excavated soil is 2.5-3.0, and the moisture content is ≤25%.

[0026] In an optional embodiment of the present invention, the modulus of the water glass is 2.0-2.8, preferably 2.4, and the Baume degree of the water glass is 35-45°Bé, preferably 40°Bé.

[0027] In an optional embodiment of the present invention, the polyacrylamide is anionic polyacrylamide with a molecular weight of 6 million to 12 million. The particle size of the agar and xanthan gum is 80-100 mesh; The modified hydroxyethyl methyl cellulose ether has a viscosity of not less than 150,000 mPa·s. The modified hydroxyethyl methyl cellulose ether is a hydroxyethyl methyl cellulose ether modified with aldehydes, and the effective substance content is ≥99%. The viscosity of the modified hydroxyethyl methyl cellulose ether measured in a 2wt% aqueous solution at 20℃ is not less than 150,000 mPa·s.

[0028] This invention does not impose any special limitations on the preparation method of modified hydroxyethyl methyl cellulose ether. A preferred method is as follows: 100 parts by weight of hydroxyethyl methyl cellulose ether are dispersed in a mixed solvent of ethanol and water, with the weight ratio of ethanol to water being 70:30-85:15, preferably 80:20. 3-8 parts by weight of an aldehyde are added under stirring. The pH is adjusted to 2-4 using dilute hydrochloric acid or dilute sulfuric acid as an acid catalyst, and the reaction is carried out at 50-70°C for 2-4 hours. After the reaction, the mixture is neutralized with alkali, and the product is obtained after washing, drying, and pulverizing. The aldehyde is preferably a 30-40 wt% formaldehyde solution.

[0029] In an optional embodiment of the present invention, the molecular weight of the polyether polyol is 400 to 2000; In an optional embodiment of the present invention, the sodium sulfate, sodium aluminate and sodium carbonate are of analytical grade. The water reduction rate of the polycarboxylate superplasticizer shall not be less than 40%; The water reduction rate of the melamine water-reducing agent is not less than 20%.

[0030] This invention provides a method for preparing the aforementioned rapid-setting, anti-dispersion synchronous grouting material, comprising: (1) Silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, shield tunnel slag, water, triethanolamine, sodium sulfate, calcium formate, sodium aluminate, sodium carbonate, melamine water-reducing agent and polycarboxylate water-reducing agent are mixed evenly to obtain synchronous grouting material A liquid; (2) Mix water glass, polyether polyol, polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether and heat and stir evenly to obtain synchronous grouting material B liquid; (3) Mix and stir the synchronous grouting material A liquid and synchronous grouting material B liquid to obtain a fast-setting and anti-dispersion synchronous grouting material.

[0031] In an optional embodiment of the present invention, in step (1), the stirring speed is 200-300 rpm and the stirring time is 3-8 min.

[0032] In an optional embodiment of the present invention, the heating temperature in step (2) is 60-80℃.

[0033] In an optional embodiment of the present invention, in step (2), the stirring speed is 50-100 rpm and the stirring time is 10-20 min.

[0034] This invention provides the application of the above-mentioned rapid-setting and anti-dispersion synchronous grouting material in synchronous grouting of shield tunnels in water-rich and soft strata.

[0035] The technical solution of the present invention will be further described below with reference to specific embodiments. The present invention does not impose any special restrictions on the source of reagents used in the following embodiments; commercially available products well known to those skilled in the art can be used.

[0036] In the following embodiments, The average particle size of silicate cement is 25 μm; The bentonite is sodium-based bentonite with an expansion ratio of 20-30 times, and it is commercially available. The average specific surface area of ​​mineral powder, fly ash, desulfurized gypsum, and calcined coal gangue powder is 521 m². 2 / kg, 485m 2 / kg, 490m 2 / kg and 472m 2 / kg; The slag had an average sulfide and sulfate content of 1.6% and an average moisture content of 3.7%. The average fineness modulus of the tunnel boring machine excavated soil is 2.6, and the average moisture content is 21.2%. The modulus of water glass is 2.4, and the Baume degree of water glass is 40°Bé. The polyacrylamide is an anionic polyacrylamide with an average molecular weight of 11 million. The average particle size of agar and xanthan gum is 90 mesh; The modified hydroxyethyl methyl cellulose ether has a viscosity of not less than 150,000 mPa·s. The modified hydroxyethyl methyl cellulose ether is a hydroxyethyl methyl cellulose ether modified with aldehydes, and the content of effective substances is ≥99%. The average molecular weight of the polyether polyol is 1200; Sodium sulfate, sodium aluminate, and sodium carbonate are of analytical grade. The average water reduction rate of polycarboxylate superplasticizer is 43%; The average water reduction rate of melamine water-reducing agent is 22%.

[0037] In the following examples, the modified hydroxyethyl methyl cellulose ether was prepared as follows: 100 parts by weight of hydroxyethyl methyl cellulose ether were weighed and placed in a reactor. A mixed solvent consisting of 250 parts by weight of anhydrous ethanol and 150 parts by weight of deionized water was added. Stirring was started, and the mixture was allowed to fully disperse and swell at 300 rpm for 30 minutes. While stirring continuously, 5 parts by weight of formaldehyde solution (concentration 37 wt%) was slowly added dropwise to the system. After the addition was complete, the pH of the reaction system was adjusted to 2.5 with dilute hydrochloric acid. The temperature of the reaction system was raised to 60°C and maintained at this temperature for 3 hours. After the reaction was completed, the system was cooled to room temperature. The pH of the reaction system was neutralized to 7.0 with 10 wt% sodium hydroxide solution. The obtained product was filtered, and the filter cake was washed three times with 300 parts by weight of 70% ethanol aqueous solution to remove residual reaction reagents and byproducts. The washed filter cake was dried in a vacuum drying oven at 80°C for 6 hours until constant weight was achieved. Finally, the dried block product was pulverized using a pulverizer and passed through a 100-mesh sieve to obtain a white powdery modified hydroxyethyl methyl cellulose ether product.

[0038] Example 1 A rapid-setting, anti-dispersion synchronous grouting material, by weight, comprises: silicate cement: bentonite: mineral powder: fly ash: desulfurized gypsum: calcined coal gangue powder: slag: shield tunnel slag: water: water glass: polyacrylamide: agar: xanthan gum: sodium polyacrylate: modified hydroxyethyl methyl cellulose ether: triethanolamine: sodium sulfate: calcium formate: sodium aluminate: sodium carbonate: polyether polyol: melamine water-reducing agent: polycarboxylate water-reducing agent = 460: 35: 85: 200: 70: 45: 120: 450: 550: 140:3: 0.8: 3: 0.5: 4: 0.3: 3: 3: 12: 7: 6: 3: 4; The preparation method of the above-mentioned rapid-setting and anti-dispersion synchronous grouting material includes the following steps: (1) Silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, shield tunnel slag, water, triethanolamine, sodium sulfate, calcium formate, sodium aluminate, sodium carbonate, melamine water-reducing agent and polycarboxylate water-reducing agent are mixed and stirred at 240 rpm for 5 min to obtain synchronous grouting material A liquid; (2) Mix water glass, polyether polyol, polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether and heat to 70°C. Stir at 70 rpm for 15 min to obtain synchronous grouting material B. (3) Mix and stir the synchronous grouting material A and B to obtain a fast-setting and anti-dispersion synchronous grouting material.

[0039] Example 2 A rapid-setting, anti-dispersion synchronous grouting material, by weight, comprises: silicate cement: bentonite: mineral powder: fly ash: desulfurized gypsum: calcined coal gangue powder: slag: shield tunnel slag: water: water glass: polyacrylamide: agar: xanthan gum: sodium polyacrylate: modified hydroxyethyl methyl cellulose ether: triethanolamine: sodium sulfate: calcium formate: sodium aluminate: sodium carbonate: polyether polyol: melamine water-reducing agent: polycarboxylate water-reducing agent = 540: 30: 70: 160: 55: 35: 150: 460: 500: 140:2: 1.2: 2.5: 0.75: 5: 0.3: 5: 2.5: 10: 9: 7: 2: 5; The preparation method of the above-mentioned rapid-setting and anti-dispersion synchronous grouting material includes the following steps: (1) Silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, shield tunnel slag, water, triethanolamine, sodium sulfate, calcium formate, sodium aluminate, sodium carbonate, melamine water-reducing agent and polycarboxylate water-reducing agent are mixed and stirred at 240 rpm for 5 min to obtain synchronous grouting material A liquid; (2) Mix water glass, polyether polyol, polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether and heat to 70°C. Stir at 70 rpm for 15 min to obtain synchronous grouting material B. (3) Mix and stir the synchronous grouting material A and B to obtain a fast-setting and anti-dispersion synchronous grouting material.

[0040] Example 3 A rapid-setting, anti-dispersion synchronous grouting material, by weight, comprises: silicate cement: bentonite: mineral powder: fly ash: desulfurized gypsum: calcined coal gangue powder: slag: shield tunnel slag: water: water glass: polyacrylamide: agar: xanthan gum: sodium polyacrylate: modified hydroxyethyl methyl cellulose ether: triethanolamine: sodium sulfate: calcium formate: sodium aluminate: sodium carbonate: polyether polyol: melamine water-reducing agent: polycarboxylate water-reducing agent = 500: 30: 100: 180: 40: 45: 180: 420: 500:180: 4: 1: 2: 0.5: 3: 0.2: 4: 2.5: 12: 7: 5: 3: 3; The preparation method of the above-mentioned rapid-setting and anti-dispersion synchronous grouting material includes the following steps: (1) Silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, shield tunnel slag, water, triethanolamine, sodium sulfate, calcium formate, sodium aluminate, sodium carbonate, melamine water-reducing agent and polycarboxylate water-reducing agent are mixed and stirred at 240 rpm for 5 min to obtain synchronous grouting material A liquid; (2) Mix water glass, polyether polyol, polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether and heat to 70°C. Stir at 70 rpm for 15 min to obtain synchronous grouting material B. (3) Mix and stir the synchronous grouting material A and B to obtain a fast-setting and anti-dispersion synchronous grouting material.

[0041] Example 4 A rapid-setting, anti-dispersion synchronous grouting material, by weight, comprises: silicate cement: bentonite: mineral powder: fly ash: desulfurized gypsum: calcined coal gangue powder: slag: shield tunnel slag: water: water glass: polyacrylamide: agar: xanthan gum: sodium polyacrylate: modified hydroxyethyl methyl cellulose ether: triethanolamine: sodium sulfate: calcium formate: sodium aluminate: sodium carbonate: polyether polyol: melamine water-reducing agent: polycarboxylate water-reducing agent = 460: 25: 100: 200: 55: 55: 120: 460: 450:180: 4: 0.8: 2.5: 0.75: 3: 0.4: 3: 3: 8: 11: 5: 4: 4; The preparation method of the above-mentioned rapid-setting and anti-dispersion synchronous grouting material includes the following steps: (1) Silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, shield tunnel slag, water, triethanolamine, sodium sulfate, calcium formate, sodium aluminate, sodium carbonate, melamine water-reducing agent and polycarboxylate water-reducing agent are mixed and stirred at 240 rpm for 5 min to obtain synchronous grouting material A liquid; (2) Mix water glass, polyether polyol, polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether and heat to 70°C. Stir at 70 rpm for 15 min to obtain synchronous grouting material B. (3) Mix and stir the synchronous grouting material A and B to obtain a fast-setting and anti-dispersion synchronous grouting material.

[0042] Example 5 A rapid-setting, anti-dispersion synchronous grouting material, by weight, comprises: silicate cement: bentonite: mineral powder: fly ash: desulfurized gypsum: calcined coal gangue powder: slag: tunnel boring machine slag: water: water glass: polyacrylamide: agar: xanthan gum: sodium polyacrylate: modified hydroxyethyl methyl cellulose ether: triethanolamine: sodium sulfate: calcium formate: sodium aluminate: sodium carbonate: polyether polyol: melamine water-reducing agent: polycarboxylate water-reducing agent = 540: 25: 85: 180: 40: 35: 150: 420: 450: 160: 3: 1: 2: 1: 5: 0.4: 4: 2: 8: 11: 6: 4: 3; The preparation method of the above-mentioned rapid-setting and anti-dispersion synchronous grouting material includes the following steps: (1) Silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, shield tunnel slag, water, triethanolamine, sodium sulfate, calcium formate, sodium aluminate, sodium carbonate, melamine water-reducing agent and polycarboxylate water-reducing agent are mixed and stirred at 240 rpm for 5 min to obtain synchronous grouting material A liquid; (2) Mix water glass, polyether polyol, polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether and heat to 70°C. Stir at 70 rpm for 15 min to obtain synchronous grouting material B. (3) Mix and stir the synchronous grouting material A and B to obtain a fast-setting and anti-dispersion synchronous grouting material.

[0043] Example 6 A rapid-setting, anti-dispersion synchronous grouting material, by weight, comprises: silicate cement: bentonite: mineral powder: fly ash: desulfurized gypsum: calcined coal gangue powder: slag: shield tunnel slag: water: water glass: polyacrylamide: agar: xanthan gum: sodium polyacrylate: modified hydroxyethyl methyl cellulose ether: triethanolamine: sodium sulfate: calcium formate: sodium aluminate: sodium carbonate: polyether polyol: melamine water-reducing agent: polycarboxylate water-reducing agent = 500: 35: 70: 160: 70: 55: 180: 460: 550: 160:2: 1.2: 3: 1: 4: 0.2: 5: 2: 10: 9: 7: 2: 4; The preparation method of the above-mentioned rapid-setting and anti-dispersion synchronous grouting material includes the following steps: (1) Silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, shield tunnel slag, water, triethanolamine, sodium sulfate, calcium formate, sodium aluminate, sodium carbonate, melamine water-reducing agent and polycarboxylate water-reducing agent are mixed and stirred at 240 rpm for 5 min to obtain synchronous grouting material A liquid; (2) Mix water glass, polyether polyol, polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether and heat to 70°C. Stir at 70 rpm for 15 min to obtain synchronous grouting material B. (3) Mix and stir the synchronous grouting material A and B to obtain a fast-setting and anti-dispersion synchronous grouting material.

[0044] Comparative Example 1 The difference from Example 5 is that mineral powder, fly ash, desulfurized gypsum and calcined coal gangue powder were not added, while the other materials and steps were the same as in Example 5.

[0045] Comparative Example 2 The difference from Example 5 is that no slag or tunnel boring machine excavation soil was added, while the other materials and steps are the same as in Example 5.

[0046] Comparative Example 3 The difference from Example 5 is that no composite anti-dispersant was added, while the other materials and steps are the same as in Example 5.

[0047] Comparative Example 4 The difference from Example 5 is that no composite early strength agent was added, while the other materials and steps are the same as in Example 5.

[0048] Comparative Example 5 The difference from Example 5 is that no composite rheology modifier was added, while the other materials and steps are the same as in Example 5.

[0049] Comparative Example 6 The difference from Example 5 is that water glass was not added, but the other materials and steps are the same as in Example 5.

[0050] Comparative Example 7 A rapid-setting, anti-dispersion synchronous grouting material, comprising: silicate cement: bentonite: mineral powder: fly ash: desulfurized gypsum: calcined coal gangue powder: slag: tunnel boring machine slag: water: water glass: modified hydroxyethyl methyl cellulose ether: triethanolamine: sodium sulfate: calcium formate: sodium aluminate: sodium carbonate: polyether polyol: melamine water-reducing agent: polycarboxylate water-reducing agent = 540: 25: 85:180: 40: 35: 150: 420: 450: 160: 12: 0.4: 4: 2: 8: 11: 6: 4: 3; The preparation method of the above-mentioned rapid-setting and anti-dispersion synchronous grouting material includes the following steps: (1) Silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, shield tunnel slag, water, triethanolamine, sodium sulfate, calcium formate, sodium aluminate, sodium carbonate, melamine water-reducing agent and polycarboxylate water-reducing agent are mixed and stirred at 240 rpm for 5 min to obtain synchronous grouting material A liquid; (2) Mix water glass, polyether polyol and modified hydroxyethyl methyl cellulose ether and heat to 70°C. Stir at 70 rpm for 15 min to obtain synchronous grouting material B liquid. (3) Mix and stir the synchronous grouting material A and B to obtain a fast-setting and anti-dispersion synchronous grouting material.

[0051] Comparative Example 8 A rapid-setting, anti-dispersion synchronous grouting material, comprising: silicate cement: bentonite: mineral powder: fly ash: desulfurized gypsum: calcined coal gangue powder: slag: shield tunnel slag: water: water glass: polyacrylamide: agar: xanthan gum: sodium polyacrylate: modified hydroxyethyl methyl cellulose ether: triethanolamine: polyether polyol: melamine water-reducing agent: polycarboxylate water-reducing agent = 540: 25:85: 180: 40: 35: 150: 420: 450: 160: 3: 1: 2: 1: 5: 25.4: 6: 4: 3; The preparation method of the above-mentioned rapid-setting and anti-dispersion synchronous grouting material includes the following steps: (1) Silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, shield tunnel slag, water, triethanolamine, melamine water-reducing agent and polycarboxylate water-reducing agent are mixed and stirred at 240 rpm for 5 min to obtain synchronous grouting material A liquid; (2) Mix water glass, polyether polyol, polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether and heat to 70°C. Stir at 70 rpm for 15 min to obtain synchronous grouting material B. (3) Mix and stir the synchronous grouting material A and B to obtain a fast-setting and anti-dispersion synchronous grouting material.

[0052] Comparative Example 9 The difference from Example 5 is that the modified hydroxyethyl methyl cellulose ether is replaced with hydroxyethyl methyl cellulose ether, while the other materials and steps are the same as in Example 5.

[0053] The performance testing method is as follows: 1. The fluidity test is conducted in accordance with the principles and methods in GB / T8077-2012 "Test Method for Homogeneity of Concrete Admixtures". A metal truncated cone mold with an upper and lower diameter of 36mm and 60mm respectively and a height of 60mm is used.

[0054] 2. The consistency test shall be conducted in accordance with the method in JGJ / T 70-2009 "Test Method for Basic Performance of Building Mortar" and the test instrument shall be a mortar consistency meter.

[0055] 3. The initial setting time test was conducted according to the method in T / CECS 563-2018 "Technical Specification for Application of Synchronous Grouting Materials in Shield Tunneling". The test instrument used was a penetration resistance meter, and the setting time was determined by the penetration resistance method.

[0056] 4. Water permeability test: The test method for water permeability is based on GB / T 50082-2009 "Test Methods for Long-term Performance and Durability of Ordinary Concrete". The test instrument used is a concrete permeability meter.

[0057] 5. The compressive strength test shall be conducted in accordance with the method in GB / T 17671-2021 "Test Method for Strength of Cement Mortar (ISO Method)".

[0058] 6. Dynamic water retention rate test: A fixed mass of synchronous grouting material is placed in the groove, and dynamic water is set to flush the synchronous grouting material at a flow rate of 1 m / s. After 30 minutes, the flushing is stopped, and the mass retention rate of the synchronous grouting material is weighed and calculated, which is the dynamic water retention rate.

[0059] 7. The water-to-land strength ratio is tested according to the method in T / CECS 563-2018 "Technical Specification for Application of Synchronous Grouting Materials in Shield Tunnel".

[0060] The working performance of each embodiment and comparative example was tested, including fluidity, consistency, initial setting time, and 28-day impermeability pressure. The results are shown in Table 1. The mechanical properties and water dispersion resistance of each embodiment and comparative example were tested, including 12-hour compressive strength, 1-day compressive strength, 3-day compressive strength, dynamic water retention rate (flow rate of 1 m / s for 30 min), and 28-day water-to-land strength ratio. The results are shown in Table 2.

[0061] Table 1. Test results of the working performance of the rapid-setting and anti-dispersion synchronous grouting material

[0062] Table 2. Test results of mechanical properties and water dispersion resistance of rapid-setting and anti-dispersion synchronous grouting materials.

[0063] As can be seen from the comparison between Example 5 and Comparative Example 1, the addition of mineral powder, fly ash, desulfurized gypsum and calcined coal gangue powder significantly improved the material's resistance to seepage pressure and mechanical properties, reduced the material's consistency and fluidity and shortened the setting time, while also having a positive effect on the material's resistance to water dispersion.

[0064] The comparison between Example 5 and Comparative Example 2 shows that the addition of slag and shield tunneling slag is beneficial to the mechanical properties, impermeability and water dispersion resistance of the material. In the consistency test of Comparative Example 2, the slurry was severely segregated and the effective consistency could not be measured, indicating that slag and shield tunneling slag can effectively maintain the stability of the slurry.

[0065] As can be seen from the comparison between Example 5 and Comparative Example 3, the addition of polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether mainly improved the dynamic water retention rate and the water-land strength ratio of the material.

[0066] As can be seen from the comparison between Example 5 and Comparative Example 4, the addition of triethanolamine, sodium sulfate, calcium formate, sodium aluminate and sodium carbonate significantly shortened the initial setting time of the material and improved its early strength.

[0067] As can be seen from the comparison between Example 5 and Comparative Example 5, the addition of polyether polyol, melamine water-reducing agent and polycarboxylate water-reducing agent mainly improves the flowability and consistency of the material.

[0068] A comparison of Example 5 and Comparative Example 6 shows that, in Comparative Example 6, the initial setting time was significantly prolonged, the compressive strength was significantly reduced, and the resistance to water dispersibility was also reduced after the absence of water glass. This proves that water glass is not only a quick-setting agent, A comparison of Example 5 and Comparative Example 7 shows that, after removing polyacrylamide, agar, xanthan gum, and sodium polyacrylate, and increasing the amount of modified hydroxyethyl methyl cellulose ether to 12 parts, the impermeability of Comparative Example 7 decreased. Simultaneously, its dynamic water retention rate and water-to-land strength ratio were significantly lower than those of Example 5. This indicates that simply increasing the amount of a single antidispersant component cannot replace the excellent anti-water dispersion effect produced by the synergistic effect of the composite antidispersant agent composed of polyacrylamide, agar, xanthan gum, sodium polyacrylate, and modified hydroxyethyl methyl cellulose ether of this invention. Furthermore, the fluidity and early strength of Comparative Example 7 were also slightly reduced.

[0069] A comparison of Example 5 and Comparative Example 8 shows that, after removing sodium sulfate, calcium formate, sodium aluminate, and sodium carbonate, and significantly increasing the amount of triethanolamine to 25.4 parts in Comparative Example 8, the initial setting time was significantly prolonged to 16.1 hours. Furthermore, the early strength was undetectable at 12 hours, only 0.38 MPa at 1 day, only 1.02 MPa at 3 days, and the anti-permeability pressure at 28 days was significantly reduced. This indicates that even with excessive use of the single early-strength component triethanolamine, it is impossible to achieve the balance and optimization of rapid setting and early-strength performance brought about by the synergistic effect of the composite early-strength agent composed of triethanolamine, sodium sulfate, calcium formate, sodium aluminate, and sodium carbonate as described in this invention. In fact, it may even impair the setting time and mechanical properties of the material.

[0070] As can be seen from the comparison between Example 5 and Comparative Example 9, the material prepared using unmodified hydroxyethyl methyl cellulose ether has lower fluidity, 28-day impermeability pressure and early strength, while the water dispersion resistance is also significantly reduced, indicating that the agglomeration and uneven dispersion of hydroxyethyl methyl cellulose ether has a significant negative impact on the material.

[0071] In summary, the rapid-setting and anti-dispersion synchronous grouting material of the present invention, through the rational combination of various raw materials and the synergistic effect of each component, enables the material to have short setting time, excellent mechanical properties, good impermeability, strong resistance to water dispersion, and realize the resource utilization of solid waste. Therefore, it can be used as a synchronous grouting material for shield tunnels in water-rich and soft strata, effectively ensuring the safe operation of the tunnel.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rapid-setting, anti-dispersion synchronous grouting material, characterized in that, It is composed of the following raw materials in parts by weight: 1330-1680 parts of cementitious matrix material, 450-550 parts of water, 140-180 parts of water glass, 8.3-14.2 parts of composite anti-dispersion agent, 20.2-31.4 parts of composite early strength agent and 10-16 parts of composite rheology modifier; The cementitious matrix material includes 460-540 parts of silicate cement, 25-35 parts of bentonite, 70-100 parts of mineral powder, 160-200 parts of fly ash, 40-70 parts of desulfurized gypsum, 35-55 parts of calcined coal gangue powder, 120-180 parts of slag, and 420-500 parts of shield tunnel slag. The composite anti-dispersant comprises 2-4 parts polyacrylamide, 0.8-1.2 parts agar, 2-3 parts xanthan gum, 0.5-1 parts sodium polyacrylate, and 3-5 parts modified hydroxyethyl methyl cellulose ether; The composite early strength agent comprises 0.2-0.4 parts of triethanolamine, 3-5 parts of sodium sulfate, 2-3 parts of calcium formate, 8-12 parts of sodium aluminate, and 7-11 parts of sodium carbonate; The composite rheology modifier comprises 5-7 parts of polyether polyol, 2-4 parts of melamine water-reducing agent, and 3-5 parts of polycarboxylate water-reducing agent. The modified hydroxyethyl methyl cellulose ether is prepared as follows: 100 parts by weight of hydroxyethyl methyl cellulose ether are dispersed in a mixed solvent of ethanol and water, with the weight ratio of ethanol to water being 70:30-85:

15. 3-8 parts by weight of formaldehyde solution are added under stirring. The pH is adjusted to 2-4 using dilute hydrochloric acid or dilute sulfuric acid as an acid catalyst. The reaction is carried out at 50-70℃ for 2-4 hours. After the reaction is completed, the mixture is neutralized with alkali, washed, dried, and pulverized to obtain the modified hydroxyethyl methyl cellulose ether. The preparation method of the rapid-setting, anti-dispersion synchronous grouting material includes: (1) Silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, shield tunnel slag, water, triethanolamine, sodium sulfate, calcium formate, sodium aluminate, sodium carbonate, melamine water-reducing agent and polycarboxylate water-reducing agent are mixed evenly to obtain synchronous grouting material A liquid; (2) Mix water glass, polyether polyol, polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether and heat and stir evenly to obtain synchronous grouting material B liquid; (3) Mix and stir the synchronous grouting material A liquid and synchronous grouting material B liquid to obtain a fast-setting and anti-dispersion synchronous grouting material.

2. The rapid-setting, anti-dispersion synchronous grouting material as described in claim 1, characterized in that, The average particle size of the silicate cement is not higher than 30 μm; The bentonite is sodium-based bentonite with an expansion ratio of 20-30 times. The specific surface area of ​​the mineral powder, fly ash, desulfurized gypsum, and calcined coal gangue powder is ≥450m². 2 / kg; The slag has a sulfide and sulfate content of ≤2.0% and a moisture content of ≤5%. The fineness modulus of the tunnel boring machine excavated soil is 2.5-3.0, and the moisture content is ≤25%.

3. The rapid-setting, anti-dispersion synchronous grouting material as described in claim 1, characterized in that, The water glass has a modulus of 2.0-2.8 and a Baume degree of 35-45°Bé.

4. The rapid-setting, anti-dispersion synchronous grouting material as described in claim 1, characterized in that, The polyacrylamide is anionic polyacrylamide with a molecular weight of 6 million to 12 million. The particle size of the agar and xanthan gum is 80-100 mesh; The viscosity of the modified hydroxyethyl methyl cellulose ether is not less than 150,000 mPa·s.

5. The rapid-setting, anti-dispersion synchronous grouting material as described in claim 1, characterized in that, The molecular weight of the polyether polyol is between 400 and 2000.

6. A method for preparing a rapid-setting, anti-dispersion synchronous grouting material as described in any one of claims 1-5, characterized in that, include: (1) Silicate cement, bentonite, mineral powder, fly ash, desulfurized gypsum, calcined coal gangue powder, slag, shield tunnel slag, water, triethanolamine, sodium sulfate, calcium formate, sodium aluminate, sodium carbonate, melamine water-reducing agent and polycarboxylate water-reducing agent are mixed evenly to obtain synchronous grouting material A liquid; (2) Mix water glass, polyether polyol, polyacrylamide, agar, xanthan gum, sodium polyacrylate and modified hydroxyethyl methyl cellulose ether and heat and stir evenly to obtain synchronous grouting material B liquid; (3) Mix and stir the synchronous grouting material A liquid and synchronous grouting material B liquid to obtain a fast-setting and anti-dispersion synchronous grouting material.

7. The preparation method according to claim 6, characterized in that, In step (1), the stirring speed is 200-300 rpm and the stirring time is 3-8 min.

8. The preparation method according to claim 6, characterized in that, In step (2), the heating temperature is 60-80℃.

9. The preparation method according to claim 6, characterized in that, In step (2), the stirring speed is 50-100 rpm and the stirring time is 10-20 min.

10. The application of a rapid-setting, anti-dispersion synchronous grouting material as described in any one of claims 1-5 in synchronous grouting of shield tunnels in water-rich, soft strata.

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