Synchronous grouting material based on undisturbed soil during shield tunneling and its preparation method

Abstract

The present invention discloses a synchronous grouting material based on original soil in shield construction and a preparation method thereof, belonging to the technical field of building materials. A synchronous grouting material based on original soil in shield construction, in parts by weight, comprises the following components: 1500 - 1800 parts of original soil slurry in shield construction, 225 - 360 parts of cement, 1.5 - 15 parts of Group A soil hardener, and 8 - 40 parts of Group B soil hardener. Compared with the traditional synchronous grouting material for shield, the slurry of the present invention has better workability and fluidity, better compactness and impermeability, can better combine with the original surrounding rock, and has stronger waterproof property. The present invention uses the original soil at the shield construction site to prepare the synchronous grouting liquid. The involved preparation method is simple, the construction cost is low, and the environmental protection performance is outstanding, which can meet the requirements of the construction site and has good economic and social benefits.

Description

Technical Field

[0001] The present invention belongs to the technical field of building materials, and particularly relates to a synchronous grouting material based on the original soil during shield construction and a preparation method thereof. Background Art

[0002] In recent years, with the continuous increase of tunnel and underground engineering projects in China, the shield tunneling method has become increasingly important in tunnel construction. The synchronous grouting process is an extremely crucial process during shield tunneling, and plays a vital role in the stability of the formed tunnel structure and the deformation control of the surrounding soil.

[0003] During the shield tunneling process, a large amount of muck is discharged externally, which not only occupies the surface construction space and affects the construction progress, but also consumes a large amount of manpower and material resources during transportation, easily causing resource waste and urban environmental damage; at the same time, the gap excavated by the shield machine needs to be filled with synchronous grouting material; if the synchronous grouting liquid can be directly prepared by using shield muck for backfilling, it not only meets the requirements of the national environmental protection policy, but also can fundamentally solve the resource waste for construction enterprises, achieve the goal of cost reduction and efficiency improvement, and truly achieve environmental friendliness and sustainable development. Summary of the Invention

[0004] The purpose of the present invention is to provide a synchronous grouting material based on the original soil during shield construction and a preparation method thereof, so as to realize the resource recycling of the original soil during shield construction. By adding cement and soil hardening agent products, a high-performance synchronous grouting material for underground engineering backfilling is prepared, while maximizing the use of on-site waste soil, and realizing the economic and environmental protection of subway engineering construction.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions:

[0006] A synchronous grouting material based on the original soil during shield construction, characterized in that: by weight, the synchronous grouting material comprises the following components: 1500 - 1800 parts of shield construction original soil slurry, 225 - 360 parts of cement, 1.5 - 15 parts of Group A soil hardening agent, 8 - 40 parts of Group B soil hardening agent; the Group A soil hardening agent is composed of the following raw materials in parts by weight: 30 - 40 parts of waterborne acrylic modified epoxy resin emulsion, 10 - 20 parts of waterborne silane oligomer solution, 1 - 5 parts of early strength agent, 35 - 60 parts of deionized water; the Group B soil hardening agent is composed of the following raw materials in parts by weight: 1 - 5 parts of expansive agent, 1 - 5 parts of dispersant, 10 - 20 parts of nano-silica sol, 1 - 5 parts of water retention agent, 1 - 5 parts of chloride, 10 - 20 parts of stabilizer, 40 - 75 parts of deionized water.

[0007] The cement is P.O.42.5 ordinary Portland cement.

[0008] A preparation method of a synchronous grouting material based on the original soil during shield tunneling construction, comprising the following steps:

[0009] S1: Stir 1500 - 1800 parts of the original soil slurry for shield tunneling construction prepared after pretreatment of muck, 225 - 360 parts of cement, and 200 - 300 parts of water evenly at a speed of 20 - 50 r / min to obtain a mixture;

[0010] S2: Add 1.5 - 15 parts of Group A soil hardener and 8 - 40 parts of Group B soil hardener to the mixture, and stir for 5 - 10 min at a speed of 20 - 50 r / min to obtain the synchronous grouting material; the fluidity spread of the synchronous grouting material slurry ≥ 160 mm; the unconfined compressive strength of the synchronous grouting material test block at 28 d ≥ 2.5 MPa.

[0011] The original soil slurry for shield tunneling construction is prepared by the following steps:

[0012] (1) Obtain the original soil during the shield tunneling construction of the project and detect it using a soil moisture content detector;

[0013] (2) According to the measured soil moisture content, mix and stir the original soil with a quantitative amount of water evenly to obtain the original soil slurry;

[0014] (3) After screening the original soil slurry through an 8 - mesh sieve, obtain the original soil slurry for shield tunneling construction; the water content of the original soil slurry for shield tunneling construction should not exceed 80%.

[0015] The Group A soil hardener is prepared by the following steps:

[0016] (1) Preparation of waterborne acrylic - modified epoxy resin emulsion: Mix 20 - 30 g of epoxy resin with 2 - 10 g of organic solvent in a three - necked flask and stir evenly at room temperature; at 80 - 100 °C, slowly drop 0.25 - 1.25 g of initiator into the three - necked flask, raise the temperature to 180 °C and react for 3 - 5 h, then add 2.5 - 7.5 g of epoxy resin and continue to react. When cooled to 60 - 80 °C, drop deionized water to adjust the pH value of the emulsion to 6 - 7, and stir and react for 1.5 - 3 h to obtain the waterborne epoxy resin emulsion;

[0017] (2) Preparation of waterborne silane oligomer solution: Add epoxy - based silane coupling agent, 1 - 5 g of hydrochloric acid solution as a catalyst, and ethanol as a solvent into a three - necked flask equipped with a constant - pressure dropping funnel and a reflux condenser; place the three - necked flask in an oil bath, heat and stir, raise the temperature to 50 °C and start to slowly drop deionized water from the dropping funnel, slowly raise the temperature to 100 °C and react for 4 - 8 h, and finally cool and vacuum - extract the solvent to obtain a colorless transparent viscous solution;

[0018] (3) Weigh the aqueous silane oligomer solution prepared in step (2) and slowly add it dropwise to the aqueous acrylic acid-modified epoxy resin emulsion prepared in step (1). After stirring at room temperature for 1.5 - 3 h, add an early strength agent, and continue to stir at high speed for 4 - 6 h to obtain the soil hardener of Group A.

[0019] The organic solvent is one or more of acrylic acid, butyl acrylate, and methyl methacrylate.

[0020] The mass ratio of the epoxy group silane coupling agent to deionized water is 3:1.

[0021] The early strength agent is one or more of triethanolamine, calcium formate, urea, and anhydrous copper sulfate.

[0022] The initiator is one or more of benzoyl peroxide, azobisisobutyronitrile, lauroyl peroxide, and di-tert-butyl peroxide.

[0023] The soil hardener of Group B is prepared by the following steps:

[0024] Weigh the expansive agent, dispersant, water retention agent, chloride, and stabilizer, and uniformly mix them in deionized water, and stir at normal temperature for 4 - 8 h;

[0025] (2) Mix nano-silica sol and ammonia water in deionized water and stir for 1 - 3 h;

[0026] (3) Slowly add the solution prepared in step (2) dropwise to the solution prepared in step (1) under stirring, and stir and react at normal temperature for 6 - 10 h to obtain the soil hardener of Group B.

[0027] The expansive agent is one or more of calcium oxide and magnesium oxide;

[0028] The dispersant is one or more of anionic and non-ionic surfactants;

[0029] The water retention agent is one or more of sodium polyacrylate and polyacrylamide;

[0030] The chloride is one or more of calcium chloride, sodium chloride, and aluminum chloride;

[0031] The stabilizer is one or more of potassium stearate, magnesium stearate, and hydrotalcite.

[0032] The soil hardener of Group A prepared in the present invention can effectively fill between soil particles or wrap around soil particles, and fill a large number of tiny pores generated during the cement hydration process, significantly reducing the porosity, and enabling the synchronous grouting material to be compacted into an integral body with a certain strength.

[0033] The B-group soil hardener prepared in the present invention can endow the synchronous grouting material with good workability, fluidity and volume stability.

[0034] Ordinary Portland cement has the advantages of high strength and good frost resistance, and when it hardens, it has a small dry shrinkage and is not prone to dry shrinkage cracks.

[0035] In summary, compared with the prior art, the present invention has the following beneficial effects: The synchronous grouting material prepared by the present invention has the characteristics of good injectability, good impermeability, good volume stability, adjustable curing time and compressive strength. While controlling settlement, it improves the waterproof performance of the tunnel, greatly reducing the risk of water leakage after the tunnel operation; and it uses local materials, fully utilizes the muck excavated by the shield to prepare the synchronous grouting material for post-wall grouting, meeting the requirements of the national environmental protection policy, and realizing the resourceization, reduction and harmless treatment of muck, with remarkable economic, social and environmental benefits. Embodiment

[0036] The following will cooperate with embodiments to detail the implementation manners of the present invention, so as to fully understand how the present invention applies technical means to solve technical problems and achieve the realization process of technical effects and implement accordingly. Example

[0037] Preparation Example 1 of A-group soil hardener:

[0038] ① In a three-necked flask, 30 g of epoxy resin and 2 g of acrylic acid were stirred evenly at room temperature. At 80 °C, 0.7 g of benzoyl peroxide was added dropwise to the three-necked flask at a rate of 0.5 ml / min, and the temperature was raised to 180 °C and reacted for 3 h. Then 5 g of epoxy resin was added and the reaction continued. When cooled to 60 °C, 60 g of deionized water was added dropwise to adjust the pH value of the emulsion to 7, and the reaction was stirred for 2 h to obtain an aqueous epoxy resin emulsion.

[0039] ② In a three-necked flask equipped with a constant-pressure dropping funnel and a reflux condenser, 30 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane coupling agent, 2 g of hydrochloric acid solution (1 M) as a catalyst, and 20 g of cyclohexane as a solvent were added. The three-necked flask was placed in an oil bath and heated and stirred. When the temperature was raised to 50 °C, 10 g of deionized water was slowly added dropwise from the dropping funnel, and the temperature was slowly raised to 100 °C and reacted for 6 h. Finally, it was cooled and the solvent was vacuum-extracted to obtain a colorless transparent viscous solution.

[0040] ③ Weigh 15 g of the aqueous silane oligomer solution and slowly add it dropwise to 40 g of the aqueous acrylic acid-modified epoxy resin emulsion. After stirring at room temperature for 2 h, 2 g of triethanolamine was added, and the high-speed stirring continued for 5 h to obtain the A-group soil hardener.

[0041] Preparation of B-group soil hardener:

[0042] ① Weigh 5 g of calcium oxide, 5 g of sodium dodecylbenzenesulfonate, 5 g of polyacrylamide, 5 g of calcium chloride, and 10 g of magnesium stearate, mix them evenly in deionized water, and stir at room temperature for 6 h.

[0043] ② Mix 10 g of nano-silica sol and 0.1 g of ammonia water in deionized water, and stir for 2 h.

[0044] ③ Slowly add the solution prepared in step ② drop by drop to the solution prepared in step ① under stirring, add 60 g of deionized water, and stir and react at room temperature for 8 h to obtain the B-group soil hardener.

[0045] S1: Stir 3000 kg of the original shield construction soil slurry with a water content of 60% prepared by pre-treating the muck, 250 kg of cement, and 250 kg of water evenly at a speed of 20 r / min to obtain a mixture.

[0046] S2: Add 5 kg of the A-group soil hardener and 20 kg of the B-group soil hardener to the mixture, and stir at a speed of 20 r / min for 10 min to obtain the synchronous grouting material. The A-group soil hardener is the soil hardener prepared in Preparation Example 1, and the B-group soil hardener is the soil hardener prepared in Preparation Example 1. Example

[0047] Preparation of A-group soil hardener:

[0048] ① In a three-necked flask, mix 30 g of epoxy resin and 3 g of methyl acrylate evenly at room temperature. At 80 °C, slowly add 0.5 g of azobisisobutyronitrile to the three-necked flask at a rate of 0.8 ml / min, raise the temperature to 180 °C and react for 3 h, then add 2 g of epoxy resin and continue to react. When cooled to 60 °C, slowly add 70 g of deionized water to adjust the pH value of the emulsion to 7, and stir and react for 2 h to obtain an aqueous epoxy resin emulsion.

[0049] ② In a three-necked flask equipped with a constant-pressure dropping funnel and a reflux condenser, add 36 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane coupling agent, 2.5 g of hydrochloric acid solution as a catalyst, and 25 g of cyclohexane as a solvent. Place the three-necked flask in an oil bath, heat and stir, raise the temperature to 50 °C, and slowly add 12 g of deionized water from the dropping funnel. Slowly raise the temperature to 100 °C and react for 5 h. Finally, cool and vacuum-extract the solvent to obtain a colorless transparent viscous solution.

[0050] ③ Weigh 20 g of the aqueous silane oligomer solution and slowly add it drop by drop to 30 g of the aqueous acrylic acid-modified epoxy resin emulsion. Stir at room temperature for 3 h, then add 3 g of calcium formate, and continue to stir at high speed for 6 h to obtain the A-group soil hardener.

[0051] Preparation of B-group soil hardener:

[0052] ① Weigh 5 g of magnesium oxide, 5 g of lauryl polyoxyethylene ether, 5 g of polyacrylamide, 5 g of calcium chloride, and 10 g of potassium stearate, mix them evenly in deionized water, and stir at room temperature for 6 h.

[0053] ② Mix 20 g of nano-silica sol and 0.2 g of ammonia water in deionized water, and stir for 2 h.

[0054] ③ While stirring, slowly add the solution prepared in step ② drop by drop into the solution prepared in step ①, add 50 g of deionized water, and stir and react at room temperature for 8 h to obtain the soil hardening agent of Group B.

[0055] S1: Stir 3600 kg of the original soil slurry of shield construction with a moisture content of 70% prepared by pre-treating muck, 360 kg of cement, and 300 kg of water evenly at a speed of 20 r / min to obtain a mixture.

[0056] S2: Add 10 kg of the soil hardening agent of Group A and 40 kg of the soil hardening agent of Group B to the mixture, and stir at a speed of 20 r / min for 10 min to obtain the synchronous grouting material. The soil hardening agent of Group A is the soil hardening agent prepared in Preparation Example 2, and the soil hardening agent of Group B is the soil hardening agent prepared in Preparation Example 2. Example

[0057] Preparation of the soil hardening agent of Group A:

[0058] ① In a three-necked flask, mix 30 g of epoxy resin and 10 g of methyl methacrylate evenly at room temperature. At 80 °C, slowly drop 1.0 g of benzoyl peroxide into the three-necked flask at a rate of 0.5 ml / min, raise the temperature to 180 °C, react for 3 h, then add 5 g of epoxy resin and continue to react. When cooled to 60 °C, add 60 g of deionized water to adjust the pH value of the emulsion to 6, and stir and react for 2 h to obtain an aqueous epoxy resin emulsion.

[0059] ② In a three-necked flask equipped with a constant-pressure dropping funnel and a reflux condenser, add 30 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane coupling agent, 5 g of hydrochloric acid solution as a catalyst, and 25 g of cyclohexane as a solvent. Place the three-necked flask in an oil bath, heat and stir, raise the temperature to 50 °C, start to slowly drop 10 g of deionized water from the dropping funnel, slowly raise the temperature to 100 °C, react for 5 h, and finally cool and vacuum-extract the solvent to obtain a colorless transparent viscous solution.

[0060] ③ Slowly drop 20 g of the aqueous silane oligomer solution into 40 g of the aqueous acrylic acid-modified epoxy resin emulsion, stir at room temperature for 3 h, then add 5 g of triethanolamine, and continue to stir at high speed for 6 h to obtain the soil hardening agent of Group A.

[0061] Preparation of the soil hardening agent of Group B:

[0062] ① Weigh 5 g of calcium oxide, 5 g of sodium dodecylbenzenesulfonate, 5 g of sodium polyacrylate, 5 g of calcium chloride, and 20 g of potassium stearate, mix them evenly in deionized water, and stir at room temperature for 6 h;

[0063] ② Mix 20 g of nano-silica sol and 0.2 g of ammonia water in deionized water and stir for 2 h;

[0064] ③ Slowly add the solution prepared in step ② drop by drop to the solution prepared in step ① under stirring, add 40 g of deionized water, and stir and react at room temperature for 8 h to obtain the soil hardening agent of group B.

[0065] S1: Stir 3000 kg of the original soil slurry of shield construction with a water content of 60% prepared by pre-treating muck, 360 kg of cement, and 300 kg of water evenly at a speed of 20 r / min to obtain a mixture.

[0066] S2: Add 10 kg of the soil hardening agent of group A and 30 kg of the soil hardening agent of group B to the mixture, and stir at a speed of 20 r / min for 10 min to obtain the synchronous grouting material. The soil hardening agent of group A is the soil hardening agent prepared in Preparation Example 3, and the soil hardening agent of group B is the soil hardening agent prepared in Preparation Example 3. Example

[0067] Preparation of the soil hardening agent of group A:

[0068] ① Put 30 g of epoxy resin and 10 g of methyl methacrylate in a three-necked flask and stir evenly at room temperature. At 80 °C, slowly drop 1.0 g of benzoyl peroxide into the three-necked flask at a rate of 0.5 ml / min, raise the temperature to 180 °C and react for 3 h, then add 5 g of epoxy resin and continue to react. When cooled to 60 °C, slowly add 60 g of deionized water to adjust the pH value of the emulsion to 6, and stir and react for 2 h to obtain an aqueous epoxy resin emulsion.

[0069] ② Add 30 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane coupling agent, 5 g of hydrochloric acid solution as a catalyst, and 25 g of cyclohexane as a solvent to a three-necked flask equipped with a constant pressure dropping funnel and a reflux condenser. Place the three-necked flask in an oil bath, heat and stir, raise the temperature to 50 °C, and slowly drop 10 g of deionized water from the dropping funnel. Slowly raise the temperature to 100 °C and react for 5 h. Finally, cool and vacuum out the solvent to obtain a colorless transparent viscous solution.

[0070] ③ Slowly add 20 g of the aqueous silane oligomer solution drop by drop to 40 g of the aqueous acrylic acid-modified epoxy resin emulsion, stir at room temperature for 3 h, then add 5 g of triethanolamine, and continue to stir at high speed for 6 h to obtain the soil hardening agent of group A.

[0071] Preparation of the soil hardening agent of group B:

[0072] ① Weigh 5 g of calcium oxide, 5 g of sodium dodecylbenzenesulfonate, 5 g of sodium polyacrylate, 5 g of calcium chloride, and 20 g of potassium stearate, and mix them evenly in deionized water, then stir at room temperature for 6 h;

[0073] ② Mix 20 g of nano-silica sol and 0.2 g of ammonia water in deionized water, and stir for 2 h;

[0074] ③ Slowly add the solution prepared in step ② drop by drop to the solution prepared in step ① under stirring, add 40 g of deionized water, and stir and react at room temperature for 8 h to obtain the soil hardening agent of Group B.

[0075] S1: Stir 3000 kg of the original soil slurry of shield construction with a water content of 60% prepared by pre-treating muck, 360 kg of cement, and 300 kg of water evenly at a speed of 20 r / min to obtain a mixture.

[0076] S2: Add 5 kg of the soil hardening agent of Group A and 30 kg of the soil hardening agent of Group B to the mixture, and stir at a speed of 20 r / min for 10 min to obtain the synchronous grouting material. The soil hardening agent of Group A is the one prepared in Preparation Example 1, and the soil hardening agent of Group B is the one prepared in Preparation Example 1.

[0077] Comparative Example 1:

[0078] Stir 236 kg of sand, 42 kg of cement, 16.8 kg of bentonite, 64 kg of fly ash, and 110 kg of water evenly at a speed of 20 r / min to prepare a traditional single-fluid synchronous grouting material.

[0079] Comparative Example 2: The difference between this comparative example and Example 1 is that the soil hardening agent of Group A and the soil hardening agent of Group B are not used.

[0080] Comparative Example 3: The difference between this comparative example and Example 1 is that the soil hardening agent of Group A is not used.

[0081] Comparative Example 4: The difference between this comparative example and Example 1 is that the soil hardening agent of Group B is not used.

[0082] Performance Test

[0083] Test the setting time, flow spread, and solidified body strength of the grouting liquid for the grouting materials prepared in Examples 1-4 and Comparative Examples 1-4 in accordance with JGJ / T 70-2009 "Standard for Test Methods of Basic Properties of Building Mortars"; test the permeability coefficient of the solidified body of the synchronous grouting material in accordance with JGJT 233-2011 "Design Code for Cement Soil Mix Ratio". The test results are shown in Table 1.

[0084]

[0085] Comparative Example 1 is the most commonly used single-fluid synchronous grouting material at present. It can be seen from the comparison of the test results in the table that the compressive strength and flow spread of the consolidated body in Examples 1-4 meet the requirements of the current standards. Compared with Comparative Example 1, the setting time is shorter, and settlement can be effectively controlled; the permeability coefficient is smaller, which can avoid the problem of water leakage in the tunnel during operation. The synchronous grouting material for undisturbed soil prepared by the present invention can completely replace the most commonly used single-fluid synchronous grouting material at present for post-grouting behind the shield during tunneling, and even has better effects in controlling settlement and preventing water leakage.

[0086] When preparing the synchronous grouting material for undisturbed soil in Comparative Example 2, neither Group A soil hardener nor Group B soil hardener was added. Therefore, the setting time and compressive strength do not meet the requirements of the current standards, which also shows that relying solely on the hydration products of cementitious materials such as cement to fill and bond the soil gaps is very limited.

[0087] When preparing the synchronous grouting material for undisturbed soil in Comparative Example 3, Group A soil hardener was not added. Therefore, the pores between the soil and the cement hydration products cannot be effectively filled to form an integral structure, and the strength cannot meet the requirements of the current standards.

[0088] When preparing the synchronous grouting material for undisturbed soil in Comparative Example 4, Group B soil hardener was not added. Therefore, the slurry does not have good workability and fluidity, and the flow spread index cannot meet the requirements of the current standards, and the injectability is poor.

[0089] As can be seen from the above, Examples 1-4 are the synchronous grouting materials obtained by using the present invention, and their various performances meet the basic use requirements of synchronous mortar, while some performances of the synchronous grouting materials in Comparative Examples 2-4 do not reach the basic use requirements.

[0090] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A synchronous grouting material based on the undisturbed soil in shield tunneling construction, characterized in that: By weight, the synchronous grouting material comprises the following components: 1500 - 1800 parts of undisturbed soil slurry in shield tunneling construction, 225 - 360 parts of cement, 1.5 - 15 parts of Group A soil hardener, 8 - 40 parts of Group B soil hardener, and 200 - 300 parts of water; the Group A soil hardener is composed of the following raw materials by weight: 30 - 40 parts of waterborne acrylic modified epoxy resin emulsion, 10 - 20 parts of waterborne silane oligomer solution, 1 - 5 parts of early strength agent, and 35 - 60 parts of deionized water; the Group B soil hardener is composed of the following raw materials by weight: 1 - 5 parts of expansive agent, 1 - 5 parts of dispersant, 10 - 20 parts of nano-silica sol, 1 - 5 parts of water retention agent, 1 - 5 parts of chloride, 10 - 20 parts of stabilizer, 40 - 75 parts of deionized water and an appropriate amount of ammonia water.

2. A synchronous grouting material based on the undisturbed soil in shield tunneling construction according to claim 1, characterized in that: The cement is P.O.42.5 ordinary Portland cement.

3. A preparation method of a synchronous grouting material based on the undisturbed soil in shield tunneling construction as described in any one of claims 1 - 2, comprising the following steps: S1: Stir 1500 - 1800 parts of undisturbed soil slurry in shield tunneling construction, 225 - 360 parts of cement and 200 - 300 parts of water prepared by pre-treating the muck at a speed of 20 - 50 r / min until evenly mixed to obtain a mixture; S2: Add 1.5 - 15 parts of Group A soil hardener and 8 - 40 parts of Group B soil hardener to the mixture, and stir at a speed of 20 - 50 r / min for 5 - 10 min to obtain the synchronous grouting material; the fluidity spread of the synchronous grouting material slurry ≥ 160 mm; the unconfined compressive strength of the synchronous grouting material specimen at 28 d ≥ 2.5 MPa.

4. A preparation method of a synchronous grouting material based on the undisturbed soil in shield tunneling construction according to claim 3, characterized in that: The undisturbed soil slurry in shield tunneling construction is prepared by the following steps: (1) Obtain the undisturbed soil in shield tunneling construction and detect it with a soil moisture content detector; (2) According to the measured soil moisture content, mix the undisturbed soil with a certain amount of water and stir evenly to obtain undisturbed soil slurry; (3) After the undisturbed soil slurry is screened through an 8 - mesh sieve, the undisturbed soil slurry in shield tunneling construction is obtained; the water content of the undisturbed soil slurry in shield tunneling construction should not exceed 80%.

5. A preparation method of a synchronous grouting material based on the undisturbed soil in shield tunneling construction according to claim 3, characterized in that: The Group A soil hardener is prepared by the following steps: (1) Preparation of waterborne acrylic modified epoxy resin emulsion: Mix 20 - 30 g of epoxy resin with 2 - 10 g of organic solvent in a three - necked flask and stir evenly at room temperature; at 80 - 100 °C, slowly add 0.25 - 1.25 g of initiator to the three - necked flask, raise the temperature to 180 °C and react for 3 - 5 h, then add 2.5 - 7.5 g of epoxy resin and continue to react. When cooled to 60 - 80 °C, add deionized water dropwise to adjust the pH value of the emulsion to 6 - 7, and stir and react for 1.5 - 3 h to obtain the waterborne epoxy resin emulsion; (2) Preparation of aqueous silane oligomer solution: Add epoxy group silane coupling agent, 1 - 5 g of hydrochloric acid solution as a catalyst, and ethanol as a solvent into a three - necked flask equipped with a constant - pressure dropping funnel and a reflux condenser; place the three - necked flask in an oil bath, heat and stir, raise the temperature to 50 °C, and slowly add deionized water dropwise from the dropping funnel, then slowly raise the temperature to 100 °C and react for 4 - 8 h. Finally, cool and vacuum - extract the solvent to obtain a colorless, transparent and viscous solution; (3) Weigh the aqueous silane oligomer solution prepared in step (2) and slowly add it dropwise to the aqueous acrylic acid - modified epoxy resin emulsion prepared in step (1). After stirring at room temperature for 1.5 - 3 h, add an early - strength agent, and continue to stir at high speed for 4 - 6 h to obtain Group A soil hardener.

6. The preparation method of a synchronous grouting material based on undisturbed soil in shield construction as described in claim 5, characterized in that: The organic solvent is one or more of acrylic acid, butyl acrylate, and methyl methacrylate.

7. The preparation method of a synchronous grouting material based on undisturbed soil in shield construction as described in claim 5, characterized in that: The mass ratio of epoxy group silane coupling agent to deionized water is 3:

1.

8. The preparation method of a synchronous grouting material based on undisturbed soil in shield construction as described in claim 5, characterized in that: The early - strength agent is one or more of triethanolamine, calcium formate, urea, and anhydrous copper sulfate.

9. The preparation method of a synchronous grouting material based on undisturbed soil in shield construction as described in claim 5, characterized in that: The initiator is one or more of benzoyl peroxide, azobisisobutyronitrile, lauroyl peroxide, and di - tert - butyl peroxide.

10. The preparation method of a synchronous grouting material based on undisturbed soil in shield construction as described in claim 3, characterized in that: The preparation of Group B soil hardener adopts the following steps: (1)Weigh the expansive agent, dispersant, water - retaining agent, chloride, and stabilizer, mix them evenly in deionized water, and stir at room temperature for 4 - 8 h; (2)Mix nano - silica sol and ammonia water in deionized water and stir for 1 - 3 h; (3)Dropwise add the solution prepared in step (2) into the solution prepared in step (1) under stirring, and stir and react at room temperature for 6 - 10 h to obtain Group B soil hardener.

11. The preparation method of a synchronous grouting material based on undisturbed soil in shield construction as described in claim 10, characterized in that : The expansive agent is one or more of calcium oxide and magnesium oxide.

12. The preparation method of a synchronous grouting material based on undisturbed soil in shield construction as described in claim 10, characterized in that : The dispersant is one or more of anionic and non - ionic surfactants.

13. The preparation method of a synchronous grouting material based on undisturbed soil in shield construction as described in claim 10, characterized in that : The water - retaining agent is one or more of sodium polyacrylate and polyacrylamide.

14. The preparation method of a synchronous grouting material based on undisturbed soil in shield construction as described in claim 10, characterized in that : The chloride is one or more of calcium chloride, sodium chloride, and aluminum chloride.

15. A preparation method of a synchronous grouting material based on undisturbed soil in shield construction as claimed in claim 10, characterized in that : the stabilizer is one or more of potassium stearate, magnesium stearate, and hydrotalcite.

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