A synchronous double-liquid grouting quality evaluation method for shield construction

Abstract

The application discloses a synchronous double-liquid grouting quality evaluation method for shield construction, which comprises the following steps: selecting a plurality of performance indexes of double-liquid slurry as primary evaluation indexes, and determining secondary evaluation indexes associated with the primary evaluation indexes; according to the division of the evaluation indexes, a hierarchical structure model of the evaluation indexes is established by using an analytic hierarchy process; a scoring standard associated with the secondary evaluation indexes and an evaluation grade of the overall score of the double-liquid slurry are formulated; parameters of the double-liquid slurry to be measured are determined according to the secondary evaluation indexes, and scoring is performed according to the scoring standard and input into the hierarchical structure model of the evaluation indexes, and finally, the corresponding weight of each level index is combined to obtain a final score. The synchronous double-liquid grouting quality evaluation method for shield construction can comprehensively and accurately describe the characteristic performances of double-liquid slurries with different mixing parameters, and grade discrimination is performed, thereby providing a basis for synchronous double-liquid grouting of shield construction.

Description

Technical Field

[0001] This invention relates to the field of grouting technology for tunnel boring machine (TBM) construction, and in particular to a method for evaluating the quality of synchronous dual-liquid grouting used in TBM construction. Background Technology

[0002] The rational development and utilization of urban underground space is conducive to optimizing urban spatial structure and improving urban traffic conditions. It is of great significance for promoting the synchronous development of underground space and the city as a whole, driving the coordinated development of urban expansion and internal improvement, and enhancing the city's comprehensive carrying capacity. The shield tunneling method, with its advantages of minimal impact on the surrounding environment, high degree of automation, rapid construction, high quality and efficiency, and safety and environmental protection, has gradually been widely applied and developed in my country's underground engineering construction, especially in the field of subway construction.

[0003] During tunnel boring machine (TBM) excavation, the formation of excavation gaps is a significant cause of ground deformation. Filling these gaps with high-performance grout can effectively prevent the collapse of the soil above the shield tail and control surface settlement. Simultaneous grouting also facilitates shield attitude control and improves tunnel assembly quality.

[0004] The differences between two-component grouts and single-component grouts are as follows: Their compositions differ; two-component grouts include cement, bentonite, stabilizers, water, etc., while single-component grouts consist of cement, sand, and water. Their setting times also differ; two-component grouts have higher early strength and a shorter setting time, while single-component grouts have better fluidity and higher strength after solidification. Furthermore, their stability differs; two-component grouts are prone to pipe blockage and have poor durability, while single-component grouts are easily diluted by groundwater. Therefore, the quality evaluation methods for single-component grouts are not applicable to the evaluation of two-component grouts.

[0005] Two-component grouts offer advantages such as short gel time and high consolidation strength, resulting in better compaction and impermeability in practical engineering. However, different geological formations and construction conditions require grout ratios that are suitable for different applications. Currently, there are few domestic cases of simultaneous two-component grouting in tunnel boring machine (TBM) construction. Different geological environments place varying performance requirements on two-component grouts, and there is no comprehensive performance index system or method for two-component grouts used in TBM construction in China. Therefore, it is essential to develop a scientific and reasonable method for evaluating the quality of simultaneous two-component grouting to fully leverage the advantages of two-component grouts in engineering projects. Summary of the Invention

[0006] To address the problems of existing technologies, this invention provides a method for evaluating the quality of simultaneous dual-liquid grouting in tunnel boring machine (TBM) construction. The specific technical solution is as follows:

[0007] The present invention provides a method for evaluating the quality of simultaneous dual-liquid grouting in shield tunneling construction, comprising the following steps:

[0008] S1. Based on the grouting performance requirements of the two-component grout, select multiple performance indicators for implementing the two-component grout as primary evaluation indicators, and determine the associated secondary evaluation indicators for each primary evaluation indicator.

[0009] S2. Based on the division of evaluation indicators at all levels, use the analytic hierarchy process (AHP) to establish a hierarchical structure model of evaluation indicators, and obtain the weights of each level of the evaluation indicator hierarchical structure model.

[0010] S3. Develop scoring criteria associated with the secondary evaluation indicators and an evaluation level for the overall score of the two-liquid slurry;

[0011] S4. The parameters of the two-component slurry to be tested are measured according to each secondary evaluation index, and the scores are entered into the evaluation index hierarchical structure model according to the scoring criteria. The final score is obtained by combining the corresponding weights of each level index.

[0012] S5. Obtain the corresponding evaluation level based on the final score of the two-component slurry to be tested, and determine whether the evaluation level meets the requirements of the corresponding project. If it does, the performance of the two-component slurry to be tested is qualified; if it does not, the two-component slurry needs to be re-mixed.

[0013] Furthermore, the primary evaluation indicators include state indicators, reaction indicators, and strength indicators. The secondary evaluation indicators to which the state indicators belong include gel time and viscosity. The secondary evaluation indicators to which the reaction indicators belong include bleeding rate and stone formation rate. The secondary evaluation indicators to which the strength indicators belong include compressive strength and water channel strength ratio.

[0014] Further, the weight range of the gelation time is 0.6-0.65, the weight range of the viscosity is 0.1-0.15, the weight range of the bleeding rate is 0.01-0.015, the weight range of the stone rate is 0.065-0.07, the weight range of the compressive strength is 0.15-0.16, and the weight range of the water channel strength ratio is 0.03-0.035.

[0015] Furthermore, the two-component slurry comprises cement, bentonite, stabilizer, water, and water glass.

[0016] Furthermore, in step S2, the judgment matrix of the hierarchical structure model of the evaluation index is determined by pairwise comparison, and the consistency of the judgment matrix is ​​checked.

[0017] Furthermore, if the consistency verification fails, the hierarchical structure model of the evaluation indicators will be reconstructed.

[0018] Furthermore, in step S3, each secondary evaluation indicator has a corresponding scoring standard, which includes a scoring level and a scoring value. Each scoring level corresponds to a preset range of the measured values ​​of the corresponding secondary evaluation indicator parameter, and also corresponds to a scoring value.

[0019] Furthermore, the rating levels include A, B, C, D, E, and F; the rating values ​​corresponding to the rating levels A, B, C, D, E, and F are 15, 10, 8, 5, 3, and 2, respectively.

[0020] Furthermore, the scoring criteria were determined using expert experience.

[0021] Furthermore, the evaluation levels of the overall score of the two-liquid slurry include Level 1, Level 2, Level 3, Level 4 and Level 5, and the score ranges of Level 1, Level 2, Level 3, Level 4 and Level 5 are (13,15], (10,13], (7,10], (4,7], and [2,4], respectively.

[0022] The beneficial effects of the technical solution provided by this invention are as follows: it can comprehensively and accurately describe the various characteristic properties of dual-liquid grouts with different ratio parameters and make grade judgments, providing a basis for synchronous dual-liquid grouting in shield tunneling. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the process for evaluating the quality of synchronous dual-liquid grouting in shield tunneling, provided in an embodiment of the present invention. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, apparatus, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0027] In one embodiment of the present invention, a method for evaluating the quality of simultaneous dual-liquid grouting in tunnel boring machine (TBM) construction is provided, see [link to relevant documentation]. Figure 1 This includes the following steps:

[0028] S1. Based on the grouting performance requirements of the two-component grout, select multiple performance indicators for implementing the two-component grout as primary evaluation indicators, and determine the associated secondary evaluation indicators for each primary evaluation indicator.

[0029] S2. Based on the division of evaluation indicators at all levels, use the analytic hierarchy process (AHP) to establish a hierarchical structure model of evaluation indicators, and obtain the weights of each level of the evaluation indicator hierarchical structure model.

[0030] S3. Develop scoring criteria associated with the secondary evaluation indicators and an evaluation level for the overall score of the two-liquid slurry;

[0031] S4. The parameters of the two-component slurry to be tested are measured according to each secondary evaluation index, and the scores are entered into the evaluation index hierarchical structure model according to the scoring criteria. The final score is obtained by combining the corresponding weights of each level index.

[0032] S5. Obtain the corresponding evaluation level based on the final score of the two-component slurry to be tested, and determine whether the evaluation level meets the requirements of the corresponding project. If it does, the performance of the two-component slurry to be tested is qualified; if it does not, the two-component slurry needs to be re-mixed.

[0033] Based on different grouting materials and methods, evaluation indicators that can reflect the quality of simultaneous two-liquid grouting in shield tunneling are selected, and a comprehensive evaluation system for the quality of simultaneous two-liquid grouting in shield tunneling is established. The evaluation indicators are constructed using the analytic hierarchy process (AHP), and the comprehensive evaluation system includes multiple layers arranged from top to bottom: overall objective, primary evaluation indicators, and secondary evaluation indicators.

[0034] The primary evaluation indicators include state indicators, reaction indicators, and strength indicators. The secondary evaluation indicators to which the state indicators belong include gel time and viscosity. The secondary evaluation indicators to which the reaction indicators belong include bleeding rate and stone formation rate. The secondary evaluation indicators to which the strength indicators belong include compressive strength and water channel strength ratio, as shown in the table below:

[0035]

[0036] The basic performance indicators of grout generally include viscosity, surface density, segregation, water retention, gelation time, compressive strength, frost resistance, natural drying shrinkage, bleeding rate, stone formation rate, and impermeability, among others. These are numerous and their measurement is cumbersome. This embodiment considers the construction environment, requirements, and process parameters of simultaneous two-component grouting during shield tunneling. It selects five main influencing factors: viscosity, gelation time, compressive strength, bleeding rate, and stone formation rate. Furthermore, the simultaneous two-component grouting method for shield tunneling is generally used in water-rich strata. The water-to-land strength ratio describes the grout's resistance to water dispersion and reflects the dispersion state of the two-component grout after injection into water-rich strata. Therefore, the water-to-land strength ratio is incorporated into the two-component grout evaluation index system.

[0037] The methods for determining each evaluation polarity index are as follows:

[0038] (1) Gel time: The time required for the slurry to become non-flowable from the time all components are mixed. The gel time is determined by the inverted cup method.

[0039] (2) Stone settling rate: The ratio of the volume of the hardened grout material to the initial volume of the grout.

[0040] A 250ml graduated cylinder should be used. The material, shape and size should conform to the current national standard GB / T12804 "Laboratory Glassware Graduated Cylinders". The graduated cylinder should be equipped with a sealed cap.

[0041] Place the measuring cylinder on a horizontal surface, fill the measuring cylinder with 245ml ± 5ml of synchronous grouting material, let it stand for 1 minute, and then measure and record the initial grout surface scale a0 in time, and then cover it tightly.

[0042] After standing for 3 days, the corresponding scale value a3 of the hardened slurry surface was measured, and the stone formation rate HR was calculated using the following formula:

[0043]

[0044] (3) Compressive strength. The compressive strength test method refers to the "Test Method for Strength of Cement Mortar (ISO Method)".

[0045] (4) Viscosity: Viscosity is determined with reference to the "Technical Specifications for Construction of Highway Bridges and Culverts".

[0046] (5) Exudation rate: The exudation rate was measured over 3 hours.

[0047] A 250ml graduated cylinder should be used. The material, shape and size should conform to the current national standard GB / T12804 "Laboratory Glassware Graduated Cylinders". The graduated cylinder should be equipped with a sealed cap.

[0048] Place the measuring cylinder on a horizontal surface, fill the measuring cylinder with 245ml ± 5ml of synchronous grouting material, let it stand for 1 minute, and then measure and record the initial grout surface scale a0 in time, and then cover it tightly.

[0049] After standing for 3 hours, the corresponding scale value a1 of the bleeding surface and the corresponding scale value a2 of the slurry surface were measured respectively. The bleeding rate BR was calculated according to the following formula:

[0050]

[0051] (6) Water-land strength ratio: the ratio of the compressive strength of the grouting material formed in water to that formed in air at 28 days.

[0052] In one embodiment of the present invention, the evaluation indicators involved in the synchronous dual-liquid grouting quality evaluation method closely follow the working characteristics of dual-liquid grout, selecting evaluation indicators that can fully describe the full morphological characteristics of dual-liquid grout from the completion of grout mixing to its performance after hardening and durability testing. A hierarchical structure model of evaluation indicators is established using the analytic hierarchy process (AHP), and the weights corresponding to each level of the hierarchical model are obtained. A judgment matrix is ​​constructed, the maximum eigenvalue of the judgment matrix is ​​calculated, normalization is performed, weight values ​​are assigned, and consistency is verified. If the consistency verification passes in this step, the next step is performed; if the consistency verification fails, the hierarchical structure model of evaluation indicators is reconstructed. Evaluation levels and scoring standards for the quality of synchronous dual-liquid grouting in shield tunneling are formulated to determine the scores of each indicator. Through weight calculation and weighted processing, the final comprehensive score of the quality of synchronous dual-liquid grouting in shield tunneling is obtained.

[0053] The indicator weights are obtained by constructing a judgment matrix using the analytic hierarchy process (AHP), calculating the maximum eigenvalue and eigenvector of the judgment matrix, normalizing it, and verifying its consistency. The scoring criteria are determined based on expert experience methods commonly used in domestic engineering practice. The final comprehensive score for the quality of simultaneous dual-liquid grouting during shield tunneling is obtained by summing the scores of each evaluation indicator and their corresponding indicator weights.

[0054] Based on the AHP method, this embodiment proposes a scientific evaluation method for the quality of simultaneous two-liquid grouting in shield tunneling, taking into full account all influencing factors. This method can comprehensively evaluate the quality of simultaneous two-liquid grouting in shield tunneling under different mix proportions from a more comprehensive, objective, and accurate perspective.

[0055] In one embodiment of the present invention, the judgment matrix of the hierarchical structure model of the evaluation index is determined by pairwise comparison, and the judgment matrix is ​​subjected to a consistency check. If the consistency check fails, the hierarchical structure model of the evaluation index is reconstructed.

[0056] Specifically, a judgment matrix is ​​constructed based on the relative importance of the evaluation indicators. In the comprehensive evaluation system, the judgment matrix X = {x} is determined by pairwise comparison. ij} n×n , where x ij The possible values ​​are shown in the table below:

[0057] Serial number X ij values]]> Meaning 1 1 Importance of index i is equal to that of index j 2 3 Importance of index i is slightly higher than that of index j 3 5 Importance of index i is higher than that of index j 4 7 Importance of index i is much higher than that of index j 5 9 Importance of index i is far higher than that of index j 6 2n (n = 1, 2, 3, 4) Importance of index i is between the adjacent judgments

[0058] The same method can be used to obtain the judgment matrix of each evaluation index at the scheme layer relative to the corresponding index at the criterion layer. After constructing the judgment matrix, a consistency check needs to be performed on the judgment matrix, and the definition of the index CI is:

[0059]

[0060] Where: λ max λ is the largest eigenvalue, n is the matrix order, and CI is the consistency index. The closer CI is to 0, the higher the consistency of the matrix; the larger the CI value, the lower the consistency of the matrix.

[0061] When the judgment matrix is ​​a third-order or higher matrix, the consistency ratio (CR) can also be used to test the consistency of the judgment matrix. CR is the ratio of CI to the average random consistency index (RI).

[0062]

[0063] When CR < 0.1, the inconsistency of the judgment matrix is ​​within an acceptable range; when CR > 0.1, the inconsistency of the judgment matrix is ​​too high, the consistency test fails, and the judgment matrix needs to be readjusted.

[0064] Calculate the maximum eigenvalue γ of each judgment matrix. max And the corresponding eigenvector W, such as the product AW of the largest eigenvalue and the eigenvector of the target layer matrix: AW = γ max ×W

[0065] The maximum eigenvalue W of each calculated judgment matrix i After normalization, the result is:

[0066]

[0067] Through the hierarchical progression of AHP, the weights of each evaluation indicator at the scheme layer and criterion layer are obtained sequentially. From the weights of each secondary indicator at the scheme layer relative to the criterion layer and the target layer, and the weights of the criterion layer relative to the target layer, the weights of each evaluation indicator at the scheme layer relative to the target layer are obtained.

[0068]

[0069] In the formula, W ci The i-th evaluation index S represents the solution layer. i W is relative to the weights of the target layer. FSij Representative scheme level evaluation index S i Relative to the j-th evaluation index F of the criterion layer j Weights; W Fj Representative criterion layer element F j Weights relative to the target layer.

[0070] The scoring criteria for the evaluation indicators are determined based on the expert experience method commonly used in domestic engineering practice. In the example of quality evaluation of simultaneous dual-liquid grouting in shield tunneling, the scoring criteria include scoring levels and scoring values. Each scoring level corresponds to a preset range of measured values ​​for the corresponding secondary evaluation indicator parameters, and also corresponds to a scoring value. The evaluation indicators for the mix proportion scheme of simultaneous dual-liquid grouting are divided into six scoring levels: A, B, C, D, E, and F. The scores for each scoring level are specified as follows: A = 15 points, B = 10 points, C = 8 points, D = 5 points, E = 3 points, and F = 2 points.

[0071] Based on the aforementioned scoring levels and criteria, the specific score for each evaluation indicator is determined. After obtaining the scores for each scheme-level evaluation indicator, the final score for the target layer can be calculated.

[0072]

[0073] In the formula, U represents the final score of the quality evaluation of simultaneous dual-liquid grouting during shield tunneling, and Y... i The i-th evaluation index S represents the solution layer. i W's score Si The i-th evaluation index S represents the solution layer. i The weight relative to the target layer. The overall score of the dual-liquid slurry is evaluated in terms of performance, from high to low, including level 1, level 2, level 3, level 4 and level 5. The score ranges of level 1, level 2, level 3, level 4 and level 5 are (13,15], (10,13], (7,10], (4,7] and [2,4], respectively.

[0074] In one embodiment of the present invention, the quality of synchronous two-component grouting used in the construction of the fourth section of the BJ renovation project is evaluated. The two-component grout comprises cement, bentonite, stabilizer, water, and water glass. A judgment matrix is ​​constructed based on the relative importance of the evaluation indicators. In the comprehensive evaluation system, the judgment matrix is ​​determined by pairwise comparison. A consistency test is performed on the judgment matrix, and its CI value is 0.032, λ. max The coefficient of performance (COP) is 3.065, and the CR (compliance ratio) is 0.062, indicating that the consistency test is passed. The scores for each level in the model are as follows:

[0075] Secondary index Weight Score Gel time S11 0.6089 10 Viscosity S12 0.1218 8 Water secretion rate 21 0.0135 8 Stone rate S22 0.0678 15 Compressive strength S31 0.157 15 Water-land strength ratio S32 0.0314 10

[0076] The scores of each evaluation indicator were weighted and the final score was 10.86, indicating that the quality of the grout was Grade 2, which meets the requirements of Grade 3 or above for construction and can be used.

[0077] The present invention provides a method for evaluating the quality of synchronous dual-liquid grouting for shield tunneling. It establishes a set of indicators that reflect the performance of dual-liquid grout, which can comprehensively and accurately describe the various characteristic performances of dual-liquid grout with different mix proportions. The evaluation indicators involved are closely related to the working characteristics of dual-liquid grout, and from the completion of grout mixing to the performance after hardening to the durability test, the evaluation indicators selected can fully describe the full morphological characteristics of dual-liquid grout.

[0078] 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, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for evaluating the quality of synchronous dual-liquid grouting in shield tunneling construction, characterized in that, Includes the following steps: S1. Based on the grouting performance requirements of the two-component grout, select multiple performance indicators for implementing the two-component grout as primary evaluation indicators, and determine the associated secondary evaluation indicators for each primary evaluation indicator. S2. Based on the division of evaluation indicators at all levels, use the analytic hierarchy process (AHP) to establish a hierarchical structure model of evaluation indicators, and obtain the weights of each level of the evaluation indicator hierarchical structure model. Multiple judgment matrices are constructed based on the relative importance of the evaluation indicators, including: determining the judgment matrix X={x} of the hierarchical structure model of the evaluation indicators using pairwise comparison methods. ij } n×n x ij The value of is related to the importance comparison results of indicator i and indicator j. The largest eigenvalue of the judgment matrix is ​​calculated, normalized, and weights are assigned. A consistency check is then performed on the judgment matrix, including calculating the consistency index CI using the following formula: CI = (λ...) max - n ) / ( n -1), where, n Let λ be the order of the matrix. max The CI value is the largest eigenvalue of the matrix. The closer the CI value is to 0, the higher the consistency of the matrix. If the consistency verification passes, proceed to the next step; if the consistency verification fails, rebuild the hierarchical structure model of the evaluation index. The largest eigenvalue of each calculated judgment matrix is ​​normalized, and the processed result is... Through AHP hierarchical progression, the weights of each evaluation indicator at the scheme layer and criterion layer are obtained sequentially. From the weights of each secondary indicator at the scheme layer relative to the criterion layer and the target layer, and from the weights of the criterion layer relative to the target layer, the weights of each evaluation indicator at the scheme layer relative to the target layer are obtained. In the formula, The i-th evaluation index of the representative scheme layer S i Relative to the weights of the target layer, W FSij Representative scheme level evaluation indicators S i Relative to the j-th evaluation index of the criterion layer F j The weight, W Fj Representative criteria layer elements F j Weights relative to the target layer; S3. Develop scoring criteria associated with the secondary evaluation indicators and an evaluation level for the overall score of the two-liquid slurry; S4. The parameters of the two-component slurry to be tested are measured according to each secondary evaluation index, and the scores are entered into the hierarchical structure model of the evaluation index according to the scoring criteria. The final score is calculated by combining the corresponding weights of each level index using the following formula: ,in, U Represents the final score. Y i The i-th evaluation index of the representative scheme layer S i The score, W Si Representative scheme layer i-th evaluation index S i Weights relative to the target layer; S5. Obtain the corresponding evaluation level based on the final score of the two-component slurry to be tested, and determine whether the evaluation level meets the requirements of the corresponding project. If it does, the performance of the two-component slurry to be tested is qualified; if it does not, the two-component slurry needs to be re-mixed.

2. The method for evaluating the quality of simultaneous dual-liquid grouting according to claim 1, characterized in that, The primary evaluation indicators include state indicators, reaction indicators, and strength indicators. The secondary evaluation indicators to which the state indicators belong include gel time and viscosity. The secondary evaluation indicators to which the reaction indicators belong include bleeding rate and stone formation rate. The secondary evaluation indicators to which the strength indicators belong include compressive strength and water channel strength ratio.

3. The method for evaluating the quality of simultaneous dual-liquid grouting according to claim 2, characterized in that, The weighting range for gel time is 0.6-0.65, the weighting range for viscosity is 0.1-0.15, the weighting range for water bleeding rate is 0.01-0.015, the weighting range for stone formation rate is 0.065-0.07, the weighting range for compressive strength is 0.15-0.16, and the weighting range for water channel strength ratio is 0.03-0.

035.

4. The method for evaluating the quality of simultaneous dual-liquid grouting according to claim 1, characterized in that, The two-component slurry comprises cement, bentonite, stabilizer, water, and water glass.

5. The method for evaluating the quality of simultaneous dual-liquid grouting according to claim 1, characterized in that, In step S3, each secondary evaluation indicator has a corresponding scoring standard, which includes a scoring level and a scoring value. Each scoring level corresponds to a preset range of the measured values ​​of the corresponding secondary evaluation indicator parameter, and also corresponds to a scoring value.

6. The method for evaluating the quality of simultaneous dual-liquid grouting according to claim 5, characterized in that, The rating levels include A, B, C, D, E, and F; the rating values ​​corresponding to rating levels A, B, C, D, E, and F are 15, 10, 8, 5, 3, and 2, respectively.

7. The method for evaluating the quality of simultaneous dual-liquid grouting according to claim 1, characterized in that, The scoring criteria were determined using expert experience.

8. The method for evaluating the quality of simultaneous dual-liquid grouting according to claim 1, characterized in that, The overall score of the two-liquid slurry is evaluated in terms of performance, from high to low, including level 1, level 2, level 3, level 4 and level 5. The score ranges of level 1, level 2, level 3, level 4 and level 5 are (13,15], (10,13], (7,10], (4,7] and [2,4], respectively.

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