Fluidized solidified soil for shield grouting

Abstract

Shield synchronous grouting slurry comprises slurry mother liquor and shield single slurry, the slurry mother liquor comprises slurry and a curing agent, and the slurry is formed by filtering construction site muck, adding water and uniformly stirring. The curing agent comprises cement, sodium sulfate and calcium carbonate, the shield single slurry comprises cement and water, and the numerical value of the water-cement ratio is larger than or equal to 1. The shield synchronous grouting slurry provided by the invention adopts flow-state solidified soil, namely, the construction site muck is used as a main material, on the basis, a curing agent is added to form a slurry master batch, the slurry master batch is mixed with shield single slurry of pure cement slurry, and the slurry is uniformly stirred to form the shield synchronous grouting slurry. The strength of the shield synchronous grouting slurry after solidification and hardening is appropriate, the stratum around a tunnel can be stably supported for a long time, the waterproof performance is good, and the occurrence rate and degree of the water leakage phenomenon of gaps of shield segments can be greatly reduced after solidification and hardening.

Description

Technical Field

[0001] The invention relates to the technical field of shield grouting, and more particularly to a fluidized solidified soil used for shield grouting. Background Art

[0002] Synchronous grouting is a key process in the construction of shield tunnels. Its main function is to stabilize the ring tunnel structure and control the deformation of the surrounding soil. The principle of synchronous grouting is to fill the soil voids with grouting agents to increase the strength and stability of the soil, thereby ensuring the safe advancement of the shield machine and the stability of the segments. In addition, the grouting material can form a solidified layer to further enhance the stability of the tunnel structure.

[0003] As a new type of filling engineering material, fluidized solidified soil has shown good construction and mechanical properties through the transformation and development of traditional stabilized soil (such as lime soil, etc.). This material has strong fluidity before solidification, and has certain strength, low permeability and water stability after solidification. It can maintain long-term stability and has low-carbon and environmentally friendly functions.

[0004] Fluidized solidified soil has similar working properties to concrete and can be used not only as a construction cushion material, but also as a solidified ground surface, showing its advantages in the application of municipal roads or construction road base materials. The use of this material not only improves construction efficiency, but also helps to achieve resource recycling and environmental protection.

[0005] In summary, there is a need to apply fluidized soil solidification technology to the synchronous grouting construction process to reduce carbon emissions and reduce engineering material costs. Summary of the invention

[0006] In order to apply fluidized solidified soil to shield synchronous grouting, the invention provides a fluidized solidified soil for shield grouting.

[0007] The technical solution of the present invention is as follows:

[0008] A fluidized solidified soil for shield grouting. The components of the shield synchronous grouting slurry include mud mother liquor and shield single slurry. The components of the mud mother liquor include mud and a curing agent. The mud is formed by filtering the construction site debris and adding water to evenly stir. The components of the curing agent include cement, sodium sulfate and calcium carbonate. The components of the shield single slurry include cement and water, and the water-cement ratio is greater than or equal to 1.

[0009] The shield synchronous grouting slurry of the present invention adopts fluidized solidified soil, that is, construction site slag (the present invention can also be shield slag) as the main material, on this basis, a curing agent is added to form a mud masterbatch, and a shield single slurry of pure cement slurry is mixed, and the shield synchronous grouting slurry is formed after uniform stirring. The shield synchronous grouting slurry thus formed has a suitable strength after solidification and hardening, can stably support the strata around the tunnel for a long time, and ensure the safety of the tunnel structure, and has good waterproof performance. After solidification and hardening, the incidence and degree of water leakage in the gaps of the shield segments can be greatly reduced.

[0010] The above-mentioned fluidized solidified soil used for shield grouting, in the process of preparing the shield synchronous grouting slurry, first prepare the mud mother liquor and the shield single slurry in two different containers respectively, the respective component materials of the mud mother liquor and the shield single slurry are mixed evenly, and the mud mother liquor and the shield single slurry are allowed to pre-react, and then the mud mother liquor and the shield single slurry are mixed in a new container according to the mixing ratio and stirred evenly.

[0011] The curing agent in the mud mother liquor and the shield single slurry are both cement-based substances, but in the present invention, they are not placed in the same container for mixing, but are made into mud mother liquor and shield single slurry separately. After standing for a certain period of time to allow the two to pre-react, the mud mother liquor and shield single slurry are evenly mixed to form shield synchronous grouting slurry.

[0012] During the pre-reaction process of the mud mother liquid, the curing agent and the soil have begun to react with each other, the cement in the curing agent reacts with each other and generates a certain amount of cement hydration products, and the particles in the soil have formed a certain degree of bonding with the cement hydration products. Of course, the generation rate of cement hydration products is much higher than the bonding rate. At the same time, the shield single slurry is also in the pre-reaction state, and the cement in it reacts with each other to generate a certain amount of cement hydration products, and gradually forms a dense network structure. Compared with the mud mother liquid, the hydration reaction rate of the shield single slurry is faster, and the number of cement hydration products generated at the same time is greater. The mud mother liquid and the shield single slurry are mixed at the same time. At this time, the soil in the mud mother liquid and the cement hydration products produce a certain degree of bonding. This bonding is based on the cement hydration products as the core, adhering to the surrounding soil particles, thus increasing the porosity of the mud mother liquid in a short time. On the other hand, at the same time, there are more cement hydration products in the shield slurry. The mixture of the two is regarded as the active collision between the slurry mother liquid and the shield slurry. Compared with the occurrence of hydration reaction in a static state, active collision is conducive to the soil particles and cement hydration products to contact and interact faster. This rapid contact will promote a faster chemical reaction rate, resulting in more chemical bonds to form, so as to promote a more complete reaction. In addition, the slurry of the slurry mother liquid and the shield slurry tends to be uniform during stirring. At this time, the cement hydration products in the shield slurry can better fill the pores formed by the bonding of the soil in the slurry mother liquid and the cement hydration products. The soil particles will be more evenly wrapped in the cement hydration products to form a dense structure, resulting in a decrease in the overall porosity and an increase in the density and strength of the structure. (In the preparation technology of conventional fluidized solidified soil, the curing agent is usually added to the mud and stirred evenly. From the perspective of chemical reaction dynamics, compared with the active mixing and active collision of the present invention, the preparation technology of conventional fluidized solidified soil is a relatively static system, so the chemical reaction therein may be limited by diffusion, and the contact between soil particles and cement hydration products may take a longer time, which leads to a slower reaction rate between the two. On the other hand, from the perspective of microstructure, the active mixing and active collision of the present invention will form a more uniform microstructure, and the soil particles will be more evenly wrapped in the cement hydration products to form a dense structure, which helps to reduce the porosity, improve the density and strength of the structure, and have higher durability and stability to subsequent water corrosion. The chemical reaction dynamics of the preparation technology of conventional fluidized solidified soil are slow, and the porosity varies during the reaction process. Most of them are filled during subsequent expansion and cementation. Therefore, the microstructure contains larger pores, resulting in a decrease in the overall structural density, affecting the subsequent corrosion resistance, and poor durability and stability.)

[0013] The present invention prepares the slurry mother liquid and the shield single slurry separately and then mixes them, so that the slurry mother liquid and the shield single slurry actively collide with each other, and fully utilizes the difference in hydration reaction rate of cement in soil and when cement acts alone. The shield single slurry that generates more cement hydration products is used as a reaction accelerator for the slurry mother liquid, thereby increasing the hydration reaction rate of cement and the bonding rate of cement hydration products in soil, thereby achieving early strength of the shield synchronous grouting slurry solidified by soil prepared with construction site debris, forming an effective support system, preventing the stratum from being greatly deformed due to loss of support, and improving the stability of the segment structure.

[0014] In addition, sodium sulfate is contained in the curing agent of the slurry mother liquor for the purpose of slow setting. Sodium sulfate can play a slow setting role in the cement system. Sodium sulfate can react with certain hydration products in cement, such as calcium hydroxide (Ca(OH)2) to generate calcium sulfate (CaSO4·2H2O). This process is relatively slow, so it can delay the setting time of cement. In the present invention, sodium sulfate is not placed in the shield single slurry, but in the curing agent of the slurry mother liquor. This is to ensure that when the slurry mother liquor is mixed with the shield single slurry, the cement hydration products of the shield single slurry are as much as possible, so as to accelerate the reaction rate of soil particles and cement hydration products. In addition, for shield construction, the slow setting of the shield synchronous grouting slurry is best reflected in the time after grouting. When the shield synchronous grouting slurry is injected behind the pipe segment, it needs to be able to flow for a considerable period of time so that the shield synchronous grouting slurry can flow to every part of the gap behind the pipe segment. In addition, during the soil solidification process, sodium sulfate can react with calcium ions in the soil to form calcium sulfate. In the subsequent mixing of the slurry mother liquor and the shield single slurry, calcium sulfate reacts with tricalcium aluminate (C3A) in the cement, consumes C3A, and delays the hydration of C3A, thereby effectively controlling the setting time of the cement, that is, the setting time of the cement hydration product, thereby playing a role in slow setting in the subsequent process. (In addition, the fluidized solidified soil of the present invention does not need to consider early initial setting and requires coagulation, because the shield synchronous grouting slurry needs time to flow to every part of the gap. Under the conditions of self-weight and vibration, it takes a certain amount of time to complete, so that the shield segment is in a balanced state before solidifying and strengthening early. Therefore, an early initial setting time, such as 2-3 hours of initial setting, is actually not conducive to slowing down the effect of water leakage.)

[0015] Calcium carbonate is a fine powdery substance, usually used as a filling material for various substances. In the present invention, calcium carbonate can fill the pores between the soil particles of the slurry mother solution and the cement hydration products, and even after mixing with the shield single slurry, it can still fill the pores between the cement hydration products of the shield single slurry and the soil particles, further reducing the porosity of the shield synchronous grouting slurry (fluidized solidified soil). The fine particle structure of calcium carbonate can also reduce the friction between particles, help improve the overall fluidity of the mixture, improve the mixing uniformity, and help improve the fluidity and stability of the mud and shield synchronous grouting slurry.

[0016] Normally, the shield single slurry used for shield synchronous grouting is cement slurry, which is a mud liquid composed of cement as the main binder. Usually, bentonite, fly ash, sand and other building materials are added to give the shield single slurry various properties or characteristics. Its water-cement ratio is more ash and less water. A lower water-cement ratio helps to increase the early strength of the cement slurry, allowing the slurry to harden faster and form a supporting structure. At the same time, a low water-cement ratio helps to reduce the permeability of the slurry and reduce the loss of slurry into the surrounding soil, ensuring that the slurry can effectively fill the predetermined space, thereby better supporting the shield excavation surface. In the fluidized solidified soil used for shield synchronous grouting in the present invention, the water-cement ratio of the shield single slurry used is more water and less ash. On the one hand, the curing agent contained in the mud mother liquor makes the mud mother liquor have a larger specific gravity and a larger viscosity, thereby increasing the water content of the shield single slurry and improving the fluidity, which is beneficial to the injection and filling of the shield synchronous grouting slurry (fluidized solidified soil) in narrow or complex spaces, so as to better fill the gaps formed after the shield machine excavation. On the other hand, the shield single liquid slurry designed with more ash and less water leads to loose grouting in actual grouting due to the relationship between early strength and large shrinkage rate, so a higher water content is used instead. The hardening of cement can still maintain the early strength characteristics, but a higher water content helps to control the shrinkage phenomenon during the hardening process, thereby delaying the hardening speed and reducing the solidification speed of the shield single slurry. After the shield single slurry is mixed with the mud mother liquor, the curing agent in the mud mother liquor can promote and compensate for the solidification and hardening effects, avoid the low final strength caused by excessive water, and provide a higher supporting force.

[0017] The above-mentioned fluidized solidified soil for shield grouting has a shrinkage rate standard of less than 1%, a permeability standard of less than 8-10 cm / s, a viscosity standard of greater than 50s, and a specific gravity standard of greater than or equal to 1.5 g / cm 3 .

[0018] The above-mentioned fluidized solidified soil used for shield grouting, the retarding time standard of the shield synchronous grouting slurry is 18-24h, the strength standard of the shield synchronous grouting slurry after final setting is 0.1-0.3MPa 1d, and the 28d strength standard is greater than or equal to 2.0MPa.

[0019] The above-mentioned fluidized solidified soil used for shield grouting has a water-cement ratio of 1:1-1.5:1 for the shield single slurry.

[0020] The above-mentioned fluidized solidified soil used for shield grouting has a mass mix ratio of cement, sodium sulfate and calcium carbonate in the solidifying agent: cement: sodium sulfate: calcium carbonate = 8:1:1.

[0021] The above-mentioned fluidized solidified soil used for shield grouting has a curing agent dosage of 150-200 kg per ton of mud.

[0022] The above-mentioned fluidized solidified soil used for shield grouting, the mass ratio of mud mother liquid to shield single slurry is: mud mother liquid: shield single slurry = 5:1-8:1.

[0023] Compared with the traditional shield synchronous grouting slurry, the specific gravity of the shield synchronous grouting slurry of the present invention is significantly larger. Under normal circumstances, the shield synchronous grouting construction site pays attention to the grouting efficiency. The shield synchronous grouting slurry with a high specific gravity may cause the shield synchronous grouting to be not smooth due to its high viscosity, affecting the shield synchronous grouting efficiency. But in fact, since the shield synchronous grouting slurry of the present invention has a significant retarding effect and its fluidity is relatively large compared to its high specific gravity, and the grouting machine of the shield synchronous grouting can, in principle, pump and grout any slurry that can flow. Therefore, the shield synchronous grouting slurry of the present invention does not have as much impact on the shield synchronous grouting efficiency as imagined. If necessary, one or more grouting holes can be added to improve the shield synchronous grouting efficiency. The present invention focuses on the specific gravity of the shield synchronous grouting slurry, mainly because the shield synchronous grouting slurry with a high specific gravity has high stability in water. Experiments have proved that the shield synchronous grouting slurry has a high specific gravity. In the early stage of underwater and underwater grouting, the shield synchronous grouting slurry will not be washed away by water under the action of grouting pressure, resulting in an increase in suspended matter, unstable grouting structure and other problems.

[0024] The present invention according to the above scheme has the beneficial effect that:

[0025] 1. The fluidized solidified soil after solidification of the present invention can significantly reduce the water leakage phenomenon in the gaps of the shield segments and improve the waterproof performance of the tunnel.

[0026] 2. The present invention prepares mud mother liquor and shield single slurry separately, and then mixes them. Through the pre-reaction process, the generation rate and cementation rate of cement hydration products in the fluidized solidified soil are increased, thereby achieving the early strength effect.

[0027] 3. The fluidized solidified soil of the present invention has a delaying effect. By adjusting the water-cement ratio of the shield single slurry and the effect of the curing agent, the fluidity of the slurry can be maintained, making it easier to inject and fill in narrow or complex spaces, ensuring that the slurry can be filled into every part of the gap behind the pipe segment.

[0028] 4. The fluidized solidified soil of the present invention has a low shrinkage rate, thereby reducing structural defects caused by shrinkage.

[0029] 5. The fluidized solidified soil of the present invention can form a more uniform microstructure, and the soil particles are more evenly wrapped in the cement hydration product to form a dense structure, which helps to improve durability and stability.

[0030] 6. The present invention uses construction site debris as the main material of fluidized solidified soil, thus realizing the recycling of construction waste and conforming to the concepts of environmental protection and sustainable development. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] A fluidized solidified soil for shield grouting. The components of the shield synchronous grouting slurry include mud mother liquor and shield single slurry. The components of the mud mother liquor include mud and a curing agent. The mud is formed by filtering the construction site debris and adding water to evenly stir. The components of the curing agent include cement, sodium sulfate and calcium carbonate. The components of the shield single slurry include cement and water, and the water-cement ratio is greater than or equal to 1.

[0033] In the process of preparing shield synchronous grouting slurry, first prepare the mud mother liquor and shield single slurry in two different containers respectively, mix the respective component materials of the mud mother liquor and the shield single slurry evenly, and allow the mud mother liquor and the shield single slurry to pre-react, and then mix the mud mother liquor and the shield single slurry in a new container according to the mix ratio and stir evenly.

[0034] Performance standard conditions of shield synchronous grouting slurry: The shrinkage rate standard of shield synchronous grouting slurry is less than 1%, the permeability standard is less than 8-10cm / s, the viscosity standard is greater than 50s, and the specific gravity standard is greater than or equal to 1.5g / cm 3 The retarding time standard is 18-24h, the strength standard of the shield synchronous grouting slurry after final setting is 0.1-0.3MPa 1d, and the 28d strength standard is greater than or equal to 2.0MPa.

[0035] The specific mix ratio of shield synchronous grouting slurry is: the water-cement ratio of shield single slurry is 1:1-1.5:1; the mass mix ratio of cement, sodium sulfate and calcium carbonate in the curing agent is: cement: sodium sulfate: calcium carbonate = 8:1:1; the mass mix ratio of mud mother liquor and shield single slurry is: mud mother liquor: shield single slurry = 5:1-8:1; the amount of curing agent added is: the amount of curing agent used per ton of mud is 150-200 kg.

[0036] Example 1: The total amount of shield single slurry is 1111 kg, the amount of water (shield single slurry) is 556 kg, the amount of cement (shield single slurry) is 556 kg, the amount of mud mother liquor is 8888.89 kg, the total amount of curing agent is 1333 kg, the amount of cement (curing agent) is 1067 kg, the amount of sodium sulfate is 133 kg, and the amount of calcium carbonate is 133 kg.

[0037] Example 2: The total amount of shield single slurry is 1053 kg, the amount of water (shield single slurry) is 585 kg, the amount of cement (shield single slurry) is 468 kg, the amount of mud mother liquor is 8947 kg, the total amount of curing agent is 1566 kg, the amount of cement (curing agent) is 1253 kg, the amount of sodium sulfate is 157 kg, and the amount of calcium carbonate is 157 kg.

[0038] Example 3: The total amount of shield single slurry is 1667 kg, the amount of water (shield single slurry) is 1111 kg, the amount of cement (shield single slurry) is 556 kg, the amount of mud mother liquor is 8333 kg, the total amount of curing agent is 1667 kg, the amount of cement (curing agent) is 1333 kg, the amount of sodium sulfate is 167 kg, and the amount of calcium carbonate is 167 kg.

[0039] In this shield synchronous grouting embodiment, shield single slurry, shield double slurry and the shield synchronous grouting slurry of the present invention are used for grouting respectively, and each is injected into different sections of the same tunnel structure to observe the water leakage of the pipe segment.

[0040] 1. Shield grouting situation of single slurry for shield tunneling.

[0041] The mix ratio of shield single slurry used on site is cement: water = 1:0.6. The specific gravity of shield single slurry is required to be 1.68 and the viscosity is 40s.

[0042] In the process of actually preparing the shield single slurry and carrying out shield grouting for several distances, it was found that after the on-site shield single slurry slurry preparation station completed the preparation of a tank of shield grouting slurry according to the mix ratio of 1:0.6 and put it into the hopper of the transport vehicle, the workers drained water to clean the slurry machine and pipeline, and the clean water containing the slurry was poured into the hopper of the transport vehicle, resulting in the actual detected slurry density of the shield single slurry being 1.4. The actual mix ratio of the shield single slurry was calculated to be cement: water = 1.2:1.

[0043] The results of the on-site sampling test are as follows:

[0044] 1. The shield single slurry will initially set in about 2-3 hours after shield grouting, and will finally set very quickly. It will have high strength in 4-6 hours and feel hard to the touch.

[0045] 2. Due to the change in the specific gravity of the unit slurry, the amount of cement used per cubic meter is reduced, and the actual volume shrinkage rate of the shield single slurry will exceed 30%. In addition, the shield single slurry test block was prepared according to the actual mix ratio of cement: water = 1.2:1, and the shrinkage rate of the shield single slurry test block reached 35.4%.

[0046] 3. Due to the early strength and excessive shrinkage rate of the single slurry of the shield, the actual grouting is not dense, and the theoretical volume is simply filled. This is obviously inconsistent with the shield specifications and the actual requirements that the shield grouting slurry should have the characteristics of slow setting and early strength. After the synchronous grouting, the tunnel has serious water leakage.

[0047] 2. Shield grouting situation of double grout for shield tunneling.

[0048] The mix ratio of double slurry used on site for shield tunneling is cement: water: 10% water glass slurry = 1:0.6:1, wherein water glass water is a sodium silicate aqueous solution with a sodium silicate mass fraction of 10%.

[0049] The results of the on-site sampling test are as follows:

[0050] 1. The strength of the shield double slurry is low 4-6 days after shield grouting, and it does not feel hard to the touch. After 7 days, it feels hard to the touch.

[0051] 2. The actual volume shrinkage of the shield double grout will exceed 12%. Additional shield double grout test blocks were prepared, and the shrinkage of the shield double grout test blocks reached more than 35%.

[0052] 3. Due to the strength lag and large shrinkage rate of the shield double grouting, the actual grouting is not dense, and the theoretical volume is simply filled. This is obviously inconsistent with the shield specifications and the actual requirements that the slurry should have slow setting and early strength. After the synchronous grouting, the tunnel has serious water leakage.

[0053] 3. Shield grouting situation of fluidized solidified soil.

[0054] Prepare mud masterbatch on site, filter the construction site slag and place it in a stirring container, add water and continue to stir evenly, then add powdered curing agent, continue to stir evenly, and stir for 8 hours (if the construction site slag is made into mud cakes and then the mud masterbatch is prepared, the stirring time will be as long as 8 hours. If the mud cakes are not made, the water content of the construction site slag is low, the viscosity is low, and the crushing efficiency of the crusher is higher, so the subsequent stirring time does not need to be 8 hours). Among them, the mud made by adding water to the construction site slag reaches a specific gravity of 1.62, and the amount of curing agent added is 150-200 kg per ton. In this embodiment, the amount of curing agent added is 150 kg.

[0055] Prepare the shield single slurry in advance in the shield slurry making station according to the water-cement ratio of 1:1-1.5:1, stir it evenly and move it to the hopper of the transport vehicle, and move the shield single slurry to the mud masterbatch preparation site.

[0056] The mud masterbatch and shield single slurry were mixed in a ratio of 5:1 (originally planned to be 8:1, but the on-site construction workers believed that the viscosity would be too high and the grouting process would not be smooth, so the ratio was reduced). Like the shield single slurry, after draining water to clean the slurry machine and pipeline, clean water containing the slurry was poured in together, resulting in the specific gravity of the shield synchronous grouting slurry (fluidized solidified soil) prepared on site being reduced to 1.4 and the viscosity being 49s.

[0057] The shield synchronous grouting slurry was transported to the shield machine working point by a slurry transporter, which took about 40 minutes and the transportation process was normal. After arriving at the site, the shield synchronous grouting slurry was pumped to the grouting platform with a slurry pump under the slurry tank. At this time, the specific gravity of the shield synchronous grouting slurry measured by on-site sampling was 1.36. The grouting platform added a grouting hole for grouting the pipe segment, with an initial pressure of 0.6bar-0.8bar. During grouting, the pressure ranged from 2.0 to 2.8.

[0058] The results of the on-site sampling test are as follows:

[0059] 1. The shield synchronous grouting slurry has an obvious retarding effect after shield grouting. The strength is low after 4-6 hours and it does not feel hard. After 1 day, it feels hard to the touch.

[0060] 2. The actual volume shrinkage of the shield synchronous grouting slurry is less than 1%. Additional shield synchronous grouting slurry test blocks were prepared, and the shield synchronous grouting slurry test blocks had basically no shrinkage.

[0061] 3. The shield synchronous grouting slurry has low early strength and shrinkage rate, and the actual grouting is dense, which obviously meets the characteristics of the shield specifications and actual requirements that the slurry should be slow-setting and early-strengthening. After synchronous grouting, there is no obvious water leakage in the tunnel.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fluidized solidified soil for shield grouting, characterized in that: The components of shield synchronous grouting slurry include mud mother liquor and shield single slurry. The components of mud mother liquor include mud and curing agent. The mud is formed by filtering the construction site debris and adding water to it and stirring it evenly. The components of the curing agent include cement, sodium sulfate and calcium carbonate. The components of shield single slurry include cement and water, and the water-cement ratio is greater than or equal to 1.

2. The fluidized solidified soil for shield grouting according to claim 1, characterized in that: In the process of preparing shield synchronous grouting slurry, first prepare the mud mother liquor and shield single slurry in two different containers respectively, mix the respective component materials of the mud mother liquor and the shield single slurry evenly, and allow the mud mother liquor and the shield single slurry to pre-react, and then mix the mud mother liquor and the shield single slurry in a new container according to the mix ratio and stir evenly.

3. The fluidized solidified soil for shield grouting according to claim 1, characterized in that: The shrinkage standard of shield synchronous grouting slurry is less than 1%, the permeability standard is less than 8-10cm / s, the viscosity standard is greater than 50s, and the specific gravity standard is greater than or equal to 1.5g / cm 3 .

4. The fluidized solidified soil for shield grouting according to claim 1, characterized in that: The retarding time standard of shield synchronous grouting slurry is 18-24h, the strength standard of shield synchronous grouting slurry 1d after final setting is 0.1-0.3MPa, and the strength standard of 28d is greater than or equal to 2.0MPa.

5. The fluidized solidified soil for shield grouting according to claim 1, characterized in that: The water-cement ratio of shield single slurry is 1:1-1.5:

1.

6. The fluidized solidified soil for shield grouting according to claim 1, characterized in that: In the curing agent, the mass ratio of cement, sodium sulfate and calcium carbonate is: cement: sodium sulfate: calcium carbonate = 8:1:

1.

7. The fluidized solidified soil for shield grouting according to claim 1, characterized in that: The mass mix ratio of mud mother liquor and shield single slurry is: mud mother liquor: shield single slurry = 5:1-8:

1.

8. The fluidized solidified soil for shield grouting according to claim 1, characterized in that: The amount of curing agent added is: 150-200 kg of curing agent per ton of mud.