Two-component synchronous grouting material for shield tunneling and preparation method and application thereof

Abstract

The application discloses a two-component synchronous grouting material for a shield, a preparation method and application thereof, and comprises 100 parts of a first component and 2-5 parts of a second component, wherein each part of the first component comprises 100-300 parts of cementing material, 400-600 parts of aggregate, 50-100 parts of suspended filler, 2-5 parts of water reducing agent, 1-5 parts of modifier and 0-3 parts of retarder; each part of the second component comprises 50-100 parts of accelerating component, 1-10 parts of shielding component and 1-5 parts of catalytic component. Compared with the prior art, the synchronous grouting material with controllable operation time and good construction performance is obtained by mixing the first component and the second component, and the synchronous grouting material can meet the construction requirements of needing large fluidity, long construction time redundancy before grouting and the quality requirements of fast cementing time, high consolidation rate, good durability of the consolidated body and good linear tunnel after grouting.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and in particular to a two-component shield tunneling synchronous grouting material, its preparation method, and its application. Background Technology

[0002] Tunnel boring machine (TBM) construction has become one of the main construction methods in the field of tunnel engineering due to its high efficiency, safety, and minimal environmental impact, and is widely used. Synchronous grouting, as a key process in TBM advancement, is used to stabilize the linearity of the tunnel segments, control surface settlement, and mitigate surrounding rock deformation. Currently, synchronous grouting materials are mainly divided into single-component grouts and two-component grouts. Single-component grouts are further divided into hardenable grouts composed of cement, fly ash, and sand, and inert grouts composed of lime, gypsum, fly ash, and sand. Two-component grouts are mainly cement-water glass grouts, which are fast-hardening, early-strength cementitious solids formed by cement as the main cementing material and water glass as the setting accelerator.

[0003] Single-component grouting is widely used in shield tunneling due to its low cost and good construction performance. However, shield tunneling using single-component grouting often encounters geological problems such as fissure water and loose geology. This causes the single-component grout to dilute and segregate upon contact with water, resulting in the cement grout overflowing with the water flow and some sand and gravel aggregate settling and filling. This leads to problems such as low solidification strength, low stone-setting rate, and large grout filling volume. Furthermore, because the single-component synchronous grouting volume is designed to meet the redundancy requirements of construction time, the gelation time is often relatively long. After the synchronous grouting material is injected into the tunnel segment wall, it can still maintain good fluidity for a long time. This increases the difficulty of maintaining the linearity of the tunnel segment due to its buoyancy, leading to frequent quality defects such as segment floating and misalignment.

[0004] Cement-water glass two-component grout has been applied in special scenarios such as soft soil strata and water-rich strata due to its advantages such as short gelation time, high early strength, and good ability to meet process quality requirements. However, its material cost is high, and the product of cement-water glass reaction is CSH gel, which generates a large amount of alkaline substances such as NaOH and Ca(OH)2. In the presence of subsurface water and fissure water, a large amount of travertine is precipitated with the water flow, causing the solidified body to continuously deteriorate and dissolve. Long-term use leads to the solubility and voiding behind the pipe segment wall, affecting its long-term service performance.

[0005] Based on the surrounding rock conditions, one type is in coastal and plain areas with poor geological conditions, mainly consisting of sandy gravel strata, soft soil strata, and stable saturated still water. After tunneling, the tunnel body converges significantly. The purpose of synchronous grouting is to control ground deformation. After injection, the grout, together with the converged sandy gravel and soft soil, wraps around the tunnel segments, sharing the ground stress and water head pressure, maintaining the linear stability of the tunnel segments. The other type is in areas with good geological conditions, such as Chongqing and Guiyang, or in plain areas with deeper burial depths. These are mainly composed of sandstone, sandy mudstone, or muddy sandstone. After excavation, the tunnel body does not converge significantly, and the groundwater is mainly flowing water such as groundwater and fissure water. The purpose of synchronous grouting is primarily to fill behind the tunnel segment walls, relying on the solidified synchronous grout to maintain the linearity of the tunnel segments and the transfer of stress. Currently, domestic tunneling projects are mainly used in coastal and plain areas, and there is relatively little research on the application of synchronous grouting materials in tunneling projects where the tunnel does not converge significantly after excavation. In shield tunneling projects where the tunnel does not converge after excavation, quality defects such as segment misalignment and floating are prone to occur during excavation. Furthermore, during operation, the linearity of the shield tunnel segments may even change, seriously affecting operational safety. A thorough analysis of the causes of these quality defects reveals that they are mainly due to issues such as segregation of the shield's synchronous grouting material upon contact with water, low consolidation strength, incomplete synchronous grouting, and long-term groundwater erosion. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a two-component shield tunneling synchronous grouting material, its preparation method and application, so as to solve the problems of long setting time, low solidification strength, low stone rate and increased difficulty in maintaining the linearity of tunnel segments in the existing single-liquid grout, as well as the problem of tunnel segments being degraded and dissolved by long-term groundwater erosion due to the reaction of the two-liquid grout and the alkaline substances generated, which cause the solidification to deteriorate and dissolve.

[0007] To achieve the above objectives, one technical solution of the present invention provides a two-component shield tunneling synchronous grouting material, comprising 100 parts of a first component and 2-5 parts of a second component, wherein:

[0008] Each portion of the first component includes 100-300 parts of cementitious material, 400-600 parts of aggregate, 50-100 parts of suspended filler, 2-5 parts of water-reducing agent, 1-5 parts of modifier, and 0-3 parts of retarder;

[0009] Each portion of the second component includes 50-100 parts of a coagulating component, 1-10 parts of a masking component, and 1-5 parts of a catalytic component.

[0010] Furthermore, the cementing material is one or more of cement, fly ash, slag powder, stone powder, and silica fume;

[0011] The aggregate is one or more of limestone manufactured sand and quartz sand, wherein the particle size of the aggregate is 10~120 mesh;

[0012] The suspended filler is one or more of sodium bentonite, calcined metakaolin, and fumed silica.

[0013] Furthermore, the water-reducing agent is one or more of naphthalene-based water-reducing agents, carboxylic acid water-reducing agents, and aminosulfonate water-reducing agents.

[0014] Furthermore, the modifier is one or more of HPMC, CMC, HEC, and pure acrylic latex powder.

[0015] Furthermore, the retarder is one or more of sodium tripolyphosphate, sodium gluconate, and sodium citrate.

[0016] Furthermore, the coagulant component is one or more of aluminum sulfate, sodium sulfate, sodium silicate, lithium carbonate, triethanolamine, and triisopropanolamine.

[0017] Furthermore, the masking component is one or more of resorcinol, hydroquinone, and phenothiazine.

[0018] Furthermore, the catalytic component is one or more of potassium hydrogen phosphate, manganese sulfate, and nano-titanium dioxide.

[0019] To achieve the above objectives, another technical solution of the present invention provides a method for preparing a two-component shield tunneling synchronous grouting material, comprising the following steps:

[0020] Premix: 100-300 parts of cementitious material, 400-600 parts of aggregate, 50-100 parts of suspended filler, 2-2 parts of water-reducing agent, 1-5 parts of modifier and 0-3 parts of retarder are premixed to obtain cement-based material.

[0021] Mixing the first component: The cement-based material and water are mixed in proportion and stirred to obtain the first component, which is then transferred to the first slurry storage tank for later use;

[0022] Mixing the second component: Mix 50-100 parts of the coagulating component, 1-10 parts of the masking component and 1-5 parts of the catalytic component, dilute to the preset concentration and store in the second slurry storage tank for later use;

[0023] Synchronous grouting fluid: The first component and the second component are injected into the pipeline mixer at a preset flow rate and dosage to mix and obtain synchronous grouting fluid.

[0024] To achieve the above objectives, another technical solution of the present invention provides an application of the two-component shield tunnel synchronous grouting material as described above in synchronous grouting during tunnel shield construction.

[0025] This invention uses a first component as a cement-based grout. A water-reducing agent is added to the cementitious material to enable the cement-based grout to disperse quickly and evenly in the grout during mixing, thereby improving the workability of the first component. Simultaneously, a modifier and a retarder are added to the cementitious material to modify its properties, allowing for adjustments to its performance within a wide range according to site requirements during construction. This meets the requirements for long redundancy operation time, high fluidity, high stone formation rate, and high consolidation rate. Furthermore, by adding a second component to the first component, after thorough mixing and reaction, the concentration of liquid-phase ions in the first component and the hydration reaction rate of the cementitious material can be adjusted, thereby achieving rapid gelation, setting, and consolidation of the first component. This satisfies the construction requirements of high fluidity and long construction time redundancy before synchronous grouting in shield tunneling, as well as the quality requirements of rapid gelation time, high consolidation rate, good durability of the consolidated body, and good tunnel linearity maintenance after grouting. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation method:

[0027] One embodiment of the present invention provides a two-component shield tunneling synchronous grouting material, used as a grouting raw material for synchronous grouting outside the tunnel segments during shield tunneling construction. The two-component shield tunneling synchronous grouting material includes 100 parts of a first component and 2-5 parts of a second component. The first component serves as a cement-based grout to provide most of the support and reinforcement for the tunnel segments after grouting. The second component serves as an admixture, mixed with the first component in a certain proportion during grouting to adjust the interparticle forces in the first component grout, so that the first component has good fluidity while maintaining good cohesiveness.

[0028] Specifically, each portion of the first component includes 100-300 parts of cementitious material, 400-600 parts of aggregate, 50-100 parts of suspended filler, 2-5 parts of water-reducing agent, 1-5 parts of modifier, and 0-3 parts of retarder.

[0029] The cementing material is one or more of cement, fly ash, slag powder, stone powder, and silica fume. Using cement, fly ash, slag powder, stone powder, or silica fume as the cementing material allows the aggregate particles to fully bond together, thereby ensuring that the grouting material has sufficient strength to support the rock mass and pipe segments after the cementing material has hydrated and solidified. This also ensures that the grouting material can fully fill the space between the rock mass and the pipe segments, reducing the floating of the pipe segments and preventing the pipe segment axis from shifting.

[0030] The aggregate is one or more of limestone manufactured sand and quartz sand. Limestone manufactured sand or quartz sand is used as aggregate and mixed with cementitious materials. Under the hydration of the cementitious materials, the mixture solidifies into a single unit, giving the solidified grout high strength and rigidity, thus providing primary strength support for the rock mass and tunnel segments. In this embodiment, the aggregate particle size is 10-120 mesh.

[0031] The suspended filler is one or more of sodium-based bentonite, calcined metakaolin, and fumed silica. Using sodium-based bentonite, calcined metakaolin, or fumed silica as the suspended filler, the mixture of the suspended filler and the gel material reduces the material's segregation and increases its uniformity, further improving the strength of the cured grout. At the same time, the incorporation of the suspended filler enables the entire grout to have a wrapping effect, allowing the grout to quickly fill the gap between the pipe segment and the rock mass after injection, ensuring that the aggregate is evenly distributed in the cementitious slurry and remains suspended without settling, and reducing the segregation of the grout material by fissure water behind the pipe segment wall.

[0032] The water-reducing agent is one or more of naphthalene-based water-reducing agents, carboxylic acid water-reducing agents, and aminosulfonate water-reducing agents. The addition of the water-reducing agent can reduce the amount of water used when mixing the first component and work together with the suspended filler to maintain good performance even with reduced water usage, thereby increasing the overall density of the grout after curing and preventing groundwater seepage.

[0033] The modifier is one or more of HPMC, CMC, HEC, and pure acrylic latex powder. HPMC, CMC, HEC, or pure acrylic latex powder is used as the modifier to modify the entire first component. After mixing with cementitious materials and aggregates, strong chemical bonds are formed through interparticle chemical reactions, and the molecular chains intertwine to regulate the coagulation between particles, maintaining good cohesiveness between particles. Furthermore, in a high-pressure, water-rich environment, the binding of groundwater with the grouting material is reduced, thereby achieving excellent underwater non-dispersibility properties.

[0034] The retarder is one or more of sodium tripolyphosphate, sodium gluconate, and sodium citrate. The addition of the retarder can slow down the setting of the first component, thereby adjusting the setting time of the grout and ensuring sufficient construction time and fluidity during grouting, thus avoiding blockage of the grouting equipment system due to the setting of the grout.

[0035] Each portion of the second component includes 50-100 parts of a coagulating component, 1-10 parts of a masking component, and 1-5 parts of a catalytic component.

[0036] The accelerator component is one or more of aluminum sulfate, sodium sulfate, sodium silicate, lithium carbonate, triethanolamine, and triisopropanolamine. Sodium sulfate, sodium silicate, lithium carbonate, triethanolamine, or triisopropanolamine are used as accelerator components to improve the setting time and early strength of the grout in the initial stage of injection. By adjusting the dosage of the accelerator component and the retarder and modifier in the first component, the overall setting time of the grout is adjusted while ensuring sufficient redundancy in the early construction phase. This ensures that the grout has reasonable fluidity, injectability, and diffusivity during construction, thereby avoiding pipe blockage, shield jamming, and incomplete filling. After injection into the pipe segment wall, it can quickly gel, reducing the linear change caused by the buoyancy of the flowing grout on the pipe segment.

[0037] The masking component is one or more of resorcinol, hydroquinone, and phenothiazine. While the setting-promoting component used in the second component can promote early and rapid setting of the grout and improve its strength, shield tunneling requires grout with high strength. Therefore, while meeting construction redundancy time requirements, faster setting of the grout is also necessary. This embodiment uses resorcinol, hydroquinone, or phenothiazine as a masking component added to the second component. This masking component mitigates the retarding effect of gypsum on C3A, C4AF, etc., in the cementitious material, promoting rapid hydration of the cementitious material itself, and thus accelerating the rapid setting of the grout behind the tunnel lining wall. Simultaneously, the incorporation of the masking component, together with the setting-promoting component, alters the ion concentration in the grout system, thereby increasing the hydration rate of the cementitious material and shortening the setting time.

[0038] The catalytic component is one or more of potassium hydrogen phosphate, manganese sulfate, and nano-titanium dioxide. Using potassium hydrogen phosphate, manganese sulfate, or nano-titanium dioxide as the catalytic component promotes the rapid hydration and consolidation reaction rate between the coagulating component in the grout and the cementitious material, thereby accelerating the cementing time of the grout and achieving the purpose of improving the cementing time of the grout.

[0039] In this embodiment, the two-component shield tunneling synchronous grouting material uses the first component, obtained by pre-mixing cementitious materials, aggregates, suspended fillers, water-reducing agents, modifiers, and retarders, as the cement-based grout. By selecting cementitious materials, aggregates, and suspended fillers with suitable particle sizes and comparative areas, the contact area between the particles of each component can be adjusted, thereby increasing the bonding strength between the particles and ensuring the structural strength of the grouting material after curing. At the same time, by adding modifiers and retarders to the first component, the setting time of the grouting material can be adjusted once at the beginning of construction to ensure a sufficiently long construction redundancy time in the early stage of grouting. Furthermore, the first component is produced, stored, and transported in the same way as the synchronous grouting materials used in existing shield tunneling construction, enabling the first component to be quickly adapted to the existing shield tunneling synchronous grouting process. The second component, prepared by combining the coagulating, shielding, and catalytic components, is used as an admixture and injected simultaneously during shield tunneling. By adjusting the dosage of the second component, the concentration of liquid phase ions in the first component slurry and the hydration reaction rate of the cementitious material can be adjusted, thereby allowing for secondary adjustment of the grout's workability and setting time. This enables the design of the process time, ensuring that the grout exhibits good workability within the specified time. After being injected into the tunnel segment wall, the grout can solidify promptly, reducing the buoyancy of the grout on the segment and providing support. This satisfies the construction requirements of high fluidity and long construction time redundancy before simultaneous grouting in shield tunneling, while also meeting the quality requirements of rapid solidification time, high consolidation rate, good durability of the consolidated body, and good tunnel linearity maintenance after grouting.

[0040] Another embodiment of the present invention provides a method for preparing a two-component shield tunneling synchronous grouting material, comprising the following steps:

[0041] S1: Premixed first component.

[0042] Cement-based materials are prepared by premixing 100-300 parts of cementitious materials, 400-600 parts of aggregates, 50-100 parts of suspended fillers, 2-5 parts of water-reducing agents, 1-5 parts of modifiers, and 0-3 parts of retarder.

[0043] S2: Mix the first component.

[0044] The cement-based material is mixed with water in a ratio of 100:30 and stirred thoroughly for 60 seconds to obtain the first component. The first component is then transferred to the first slurry storage tank for later use.

[0045] S3: Mix the second component.

[0046] Mix 50-100 parts of the coagulating component, 1-10 parts of the masking component, and 1-5 parts of the catalytic component, and dilute to a preset concentration (the concentration of the diluted solution is 5-20%) and store in the second slurry storage tank for later use.

[0047] S4: Mixed synchronous grouting fluid.

[0048] The first and second components are injected into the pipeline mixer at a preset flow rate and dosage, mixed and poured into the pipe wall, and the grouting is completed synchronously.

[0049] To further illustrate the working performance and setting performance of the two-component shield tunneling synchronous grouting material of the present invention, the following description is based on the proportion or mass of the first and second components after their usage is reduced proportionally in actual shield tunneling construction.

[0050] Example 1

[0051] The two-component shield tunneling synchronous grouting material in this embodiment includes 100 parts of the first component and 2 parts of the second component. Wherein:

[0052] Each first component comprises 300 parts of cementitious material, 600 parts of aggregate, 100 parts of suspension filler, 5 parts of water-reducing agent, 5 parts of modifier, and 3 parts of retarder. In this embodiment, the cementitious material is a mixture of 200 parts of cement, 50 parts of slag powder, and 50 parts of fly ash; the aggregate is quartz sand with a particle size of 100 mesh; the suspension filler is a mixture of 70 parts of sodium-based bentonite and 30 parts of calcined metakaolin; the water-reducing agent is a carboxylic acid water-reducing agent; the modifier is a mixture of 1 part of HEC and 4 parts of pure acrylic latex powder; and the retarder is sodium citrate.

[0053] Each portion of the second component has a solution concentration of 20%, comprising 100 parts of a coagulant component, 10 parts of a masking component, and 5 parts of a catalytic component. In this embodiment, the coagulant component is a mixture of 30 parts aluminum sulfate, 65 parts sodium sulfate, and 5 parts triethanolamine; the masking component is a mixture of 9 parts resorcinol and 1 part phenothiazine; and the catalytic component is nano-titanium dioxide.

[0054] Example 2

[0055] The difference between the two-component shield tunneling synchronous grouting material in this embodiment and that in embodiment 1 is that this embodiment includes 100 parts of the first component and 2.5 parts of the second component.

[0056] Example 3

[0057] The difference between the two-component shield tunneling synchronous grouting material in this embodiment and that in embodiment 1 is that this embodiment includes 100 parts of the first component and 3 parts of the second component.

[0058] Example 4

[0059] The difference between the two-component shield tunneling synchronous grouting material in this embodiment and that in Embodiment 1 is that this embodiment includes 100 parts of the first component and 3.5 parts of the second component.

[0060] Example 5

[0061] The difference between the two-component shield tunneling synchronous grouting material in this embodiment and that in embodiment 1 is that this embodiment includes 100 parts of the first component and 4 parts of the second component.

[0062] Example 6

[0063] The difference between the two-component shield tunneling synchronous grouting material in this embodiment and that in embodiment 1 is that this embodiment includes 100 parts of the first component and 4.5 parts of the second component.

[0064] Example 7

[0065] The difference between the two-component shield tunneling synchronous grouting material in this embodiment and that in embodiment 1 is that this embodiment includes 100 parts of the first component and 5 parts of the second component.

[0066] Example 8

[0067] The difference between the two-component shield tunneling synchronous grouting material in this embodiment and that in Embodiment 1 is:

[0068] Each first component comprises 100 parts of cementitious material, 400 parts of aggregate, 50 parts of suspended filler, 2 parts of water-reducing agent, and 1 part of modifier. In this embodiment, the cementitious material is a mixture of 80 parts of cement, 10 parts of slag powder, and 10 parts of silica fume; the aggregate is manufactured limestone sand with a particle size of 120 mesh; the suspended filler is sodium-based bentonite; the water-reducing agent is a naphthalene-based water-reducing agent; and the modifier is a mixture of 0.1 parts of HPMC and 0.9 parts of pure acrylic latex powder.

[0069] Each portion of the second component solution has a concentration of 5%, comprising 50 parts of a coagulant component, 1 part of a masking component, and 1 part of a catalytic component. In this embodiment, the coagulant component is a mixture of 15.5 parts aluminum sulfate, 31 parts sodium silicate, and 3.5 parts lithium carbonate; the masking component is a mixture of 0.9 parts hydroquinone and 0.1 parts phenothiazine; and the catalytic component is manganese sulfate.

[0070] Example 9

[0071] The difference between the two-component shield tunneling synchronous grouting material in this embodiment and that in Embodiment 1 is:

[0072] Each first component comprises 200 parts of cementitious material, 500 parts of aggregate, 70 parts of suspended filler, 4 parts of water-reducing agent, 3 parts of modifier, and 2 parts of retarder. In this embodiment, the cementitious material is a mixture of 190 parts of cement and 10 parts of silica fume; the aggregate is quartz sand; the suspended filler is calcined metakaolin; the water-reducing agent is aminosulfonate water-reducing agent; the modifier is a mixture of 1 part of CMC and 2 parts of pure acrylic latex powder; and the retarder is sodium tripolyphosphate.

[0073] Each portion of the second component solution has a concentration of 10%, comprising 80 parts of a coagulating agent, 5 parts of a masking agent, and 3 parts of a catalytic agent. In this embodiment, the coagulating agent is a mixture of 32 parts sodium sulfate, 40 parts sodium silicate, 4 parts lithium carbonate, and 4 parts triisopropanolamine; the masking agent is a mixture of 3 parts hydroquinone and 2 parts phenothiazine; and the catalytic agent is potassium hydrogen phosphate.

[0074] Comparative Example 1

[0075] Comparative Example 1 uses traditional single-component grouting. To better illustrate the effects of the present invention, the difference between Comparative Example 1 and Example 1 is that only 100 parts of the first component are used for grouting. Each part of the first component includes:

[0076] The mixture comprises 350 parts cementitious material, 200 parts cement, and 150 parts fly ash; 500 parts aggregate; 50 parts suspended filler; 5 parts water-reducing agent; 3 parts modifier; and 1 part retarder. In this comparative example, the cementitious material is a mixture of 200 parts cement and 150 parts fly ash; the aggregate is limestone sand with a particle size of 10-100 mesh; the suspended filler is sodium-based bentonite; the water-reducing agent is a carboxylic acid water-reducing agent; the modifier is HEC; and the water ratio (cement-based material:water = 100:30) remains constant.

[0077] Comparative Example 2

[0078] Comparative Example 2 uses a traditional two-component grouting method. The difference between Comparative Example 2 and Example 1 is that the first component is 100 parts of cement with a water-to-cement ratio of 1:1, and the second component is 20 parts of water glass with a modulus of 3.2 and a Baume degree of 40.

[0079] The two-component shield tunneling synchronous grouting materials in Examples 1-9, the grouting material without the second component in Comparative Example 1, and the traditional cement-water glass two-component grouting material in Comparative Example 2 were tested according to the performance and test methods specified in TCECS563-2018 "Technical Specification for Application of Synchronous Grouting Materials for Shield Tunneling" and TTBMA 008-2021 "Technical Specification for Application of Premixed Cement-Based Shield Tunneling Grouting Materials". The test results are shown in Table 1 below:

[0080] Table 1

[0081]

[0082] As can be seen from Table 1, the two-component shield synchronous grouting material used in Examples 1-9 of this invention employs a combination of the first and second components during construction. The first component, as a cement-based grout, exhibits excellent workability and water resistance, and its construction operation time can be adjusted within a wide range according to the requirements of the construction site, meeting the requirements of large redundancy time, high fluidity, high stone formation rate, and high consolidation rate. Simultaneously, the second component, as a low-dosage admixture, after mixing with the first component in the pipeline, can adjust the liquid phase ion concentration, liquid phase viscosity, and hydration reaction rate of the cementitious material in the first component grout, achieving rapid gelation, setting, and consolidation of the first component grout. This satisfies the construction requirements of high fluidity and long construction time redundancy before synchronous grouting in shield construction, as well as the requirements of fast gelation time, high consolidation rate, good durability of the consolidated body, and good quality maintenance of tunnel linearity after grouting. Its workability, setting time, and strength are all far superior to those of Comparative Examples 1-2, and the water-land strength ratio of the solidified grout is ≥75%, indicating higher water resistance.

[0083] In this embodiment, the amount of the second component added is 2% to 5% (i.e., 2 to 5 parts) of the first component, which is much less than the amount of traditional two-component grouting materials (such as cement-water glass), effectively saving the cost of grouting materials. Furthermore, the two-component approach significantly reduces grout waste caused by grout leakage and segregation during synchronous grouting, further saving grouting costs. Simultaneously, because the gelation time is controllable, it has good engineering effects on the linear maintenance, floating, and misalignment of shield tunnel segments. The grout has a high consolidation rate, a high water-to-land strength ratio, and good non-dispersibility when exposed to water, effectively reducing the occurrence of voids behind the segments. From a life-cycle perspective, it has better economic efficiency.

[0084] In addition, the first component of this embodiment can be used for grouting alone, and the second component can be added to the first component as a supplement in case of emergency to shorten the initial setting time, thereby ensuring the construction performance of the grout.

Claims

1. A two-component shield synchronous grouting material, characterized in that, The two-component synchronous grouting material comprises a first component and a second component, wherein the first component comprises 100 parts of cementitious material, 400-600 parts of aggregate, 50-100 parts of suspended filler, 2-5 parts of water reducing agent, 1-5 parts of modifier and 0-3 parts of retarder, and the second component comprises 50-100 parts of accelerating component, 1-10 parts of masking component and 1-5 parts of catalytic component. The cementitious material is one or more of cement, fly ash, slag powder, stone powder and silica fume. The suspended filler is one or more of sodium bentonite, calcined metakaolin and fumed silica. The modifier is one or more of HPMC, CMC, HEC and pure acrylic emulsion powder. The accelerating component is one or more of aluminum sulfate, sodium sulfate, sodium silicate, lithium carbonate, triethanolamine and triisopropanolamine. The mixing method comprises the following steps: Pre-mixing: 100-300 parts of cementitious material, 400-600 parts of aggregate, 50-100 parts of suspended filler, 2-5 parts of water reducing agent, 1-5 parts of modifier and 0-3 parts of retarder are pre-mixed to obtain a cement-based material; Mixing the first component: the cement-based material is mixed with water in a certain proportion to obtain the first component, and the first component is transferred to a first slurry tank for use; 2. The two-component shield synchronous grouting material according to claim 1, characterized in that, Mixing the second component: 50-100 parts of accelerating component, 1-10 parts of masking component and 1-5 parts of catalytic component are mixed and diluted to a predetermined concentration, and then stored in a second slurry tank for use; 3. The two-component shield synchronous grouting material according to claim 1, characterized in that, Mixing the synchronous grouting liquid: the first component and the second component are synchronously injected into a pipeline mixer at a predetermined flow rate and amount to obtain the synchronous grouting liquid.

4. The two-component shield synchronous grouting material according to claim 1, characterized in that, 7. The two-component synchronous grouting material according to any one of claims 1-5 is applied to synchronous grouting in tunnel shield construction.

5. The two-component shield synchronous grouting material according to claim 1, characterized in that, ​ 6. A method for producing a two-component shield-jointing grout, for producing a two-component shield-jointing grout according to any one of claims 1 to 5, characterized in that ​ ​ ​ ​ ​ ​

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