CN-114742344-B - Synchronous double-liquid grouting quality evaluation method for shield construction

CN114742344BCN 114742344 BCN114742344 BCN 114742344BCN-114742344-B

Abstract

The invention discloses a synchronous double-liquid grouting quality evaluation method for shield construction, which comprises the following steps of selecting a plurality of performance indexes for implementing double-liquid grouting as first-level evaluation indexes, determining second-level evaluation indexes associated with each first-level evaluation index, establishing an evaluation index hierarchical structure model according to the division of each level of evaluation indexes by using a hierarchical analysis method, formulating a grading standard associated with the second-level evaluation indexes and the evaluation grade of the overall score of the double-liquid grouting, carrying out parameter measurement on the double-liquid grouting to be tested according to each second-level evaluation index, grading according to the grading standard, inputting the grading to the evaluation index hierarchical structure model, and combining the corresponding weights of each level of indexes to obtain a final score. The synchronous double-liquid grouting quality evaluation method for shield construction provided by the invention can comprehensively and accurately describe each characteristic performance of double-liquid grouting with different proportioning parameters, and can be used for grade discrimination, so that a basis is provided for synchronous double-liquid grouting for shield construction.

Inventors

YAO ZHANHU
ZHAO ZHENZHOU
LUO CHUNGUANG
ZHANG YAZHOU
LIU SIYUAN
WEI CHI
ZHANG XIYING
SHI JIA
ZENG DECHENG
HE JIANGUANG
Lv Jirui
CHENG XIAOQING
ZHANG YANG
Gou changchun
LI HUI

Assignees

中交隧道工程局有限公司

Dates

Publication Date: 20260512
Application Date: 20220228

Claims (8)

1. The synchronous double-liquid grouting quality evaluation method for shield construction is characterized by comprising the following steps of: S1, selecting a plurality of performance indexes for implementing double-liquid slurry as first-level evaluation indexes according to grouting performance requirements of the double-liquid slurry, and determining associated second-level evaluation indexes to which each first-level evaluation index belongs; S2, establishing an evaluation index hierarchical structure model according to the division of evaluation indexes of each level by using a hierarchical analysis method, obtaining corresponding weights of all levels of the evaluation index hierarchical structure model, constructing a plurality of judgment matrixes according to the relative importance of the evaluation indexes, wherein the steps of determining that the value of the judgment matrix X= { X ij } n×n ,x ij of the evaluation index hierarchical structure model is related to the importance comparison result of the index i and the index j by using a pairwise comparison method, calculating the maximum characteristic value of the judgment matrix, carrying out normalization processing, distributing weight values, carrying out consistency check on the judgment matrix, and calculating a consistency index CI by using the following formula, wherein n is the matrix order, lambda max is the maximum characteristic value of the matrix, the higher the consistency of the matrix is as the CI value approaches 0, if the consistency verification is passed, carrying out the next step, carrying out reconstruction of the evaluation index structural model, carrying out normalization processing on the maximum characteristic value of each judgment matrix obtained by calculation, and obtaining the maximum characteristic value of the judgment matrix after the normalization processing, wherein the result is obtained after the normalization processing Sequentially obtaining weights of evaluation indexes of a scheme layer and a criterion layer through AHP hierarchical promotion, and obtaining weights of evaluation indexes of the scheme layer relative to a target layer by using weights of secondary indexes of the scheme layer relative to the criterion layer and the target layer and weights of the criterion layer relative to the target layer: In which, in the process, Representing the weight of the i-th evaluation index S i of the scheme layer relative to the target layer, W FSij represents the weight of the j-th evaluation index F j of the criterion layer relative to the evaluation index S i of the scheme layer, and W Fj represents the weight of the criterion layer element F j relative to the target layer; s3, formulating a scoring standard associated with the second-level evaluation index and an evaluation grade of the overall score of the dual-slurry; S4, carrying out parameter measurement on the double-liquid slurry to be tested according to each second-level evaluation index, scoring according to the scoring standard, inputting the scoring result into the evaluation index hierarchical structure model, and calculating a final score by combining the corresponding weights of each hierarchical index through the following formula: Wherein U represents the final score, Y i represents the score of the scheme layer i-th evaluation index S i , and W Si represents the weight of the scheme layer i-th evaluation index S i relative to the target layer; S5, obtaining a corresponding evaluation grade according to the final score of the double-liquid slurry to be tested, judging whether the evaluation grade meets the grade required by the corresponding engineering, if so, judging that the performance of the double-liquid slurry to be tested is qualified, and if not, re-preparing the double-liquid slurry.
2. The method for evaluating the quality of synchronous double-liquid grouting according to claim 1, wherein the first-level evaluation index comprises a state index, a reaction index and a strength index, the second-level evaluation index to which the state index belongs comprises gel time and viscosity, the second-level evaluation index to which the reaction index belongs comprises bleeding rate and calculus rate, and the second-level evaluation index to which the strength index belongs comprises compression strength and waterway strength ratio.
3. The method for evaluating the quality of synchronous double-liquid grouting according to claim 2, wherein the weight range of the gel 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 calculus rate is 0.065-0.07, the weight range of the compressive strength is 0.15-0.16, and the weight range of the waterway strength ratio is 0.03-0.035.
4. The method for evaluating the quality of synchronous double-liquid grouting according to claim 1, wherein the double-liquid grouting component comprises cement, bentonite, a stabilizer, water and water glass.
5. The method according to claim 1, wherein in step S3, each secondary evaluation index has a corresponding scoring standard, the scoring standard including a scoring grade and a scoring value, each scoring grade corresponding to a preset range of corresponding secondary evaluation index parameter measurement values and corresponding to a scoring value.
6. The method for evaluating the quality of synchronous double-liquid grouting according to claim 5, wherein the grading comprises A, B, C, D, E, F, and the grading values corresponding to the A, B, C, D, E, F grading levels correspond to 15, 10, 8, 5, 3 and 2 respectively.
7. The method for evaluating the quality of synchronous double-fluid grouting according to claim 1, wherein the scoring standard is determined by an expert empirical method.
8. The method according to claim 1, wherein the evaluation level of the dual slurry overall score includes 1 level, 2 level, 3 level, 4 level and 5 level from high to low according to the performance, and the score ranges of 1 level, 2 level, 3 level, 4 level and 5 level are (13, 15), (10, 13), (7, 10), (4, 7) and [2,4] respectively.

Description

Synchronous double-liquid grouting quality evaluation method for shield construction Technical Field The invention relates to the technical field of shield construction grouting, in particular to a synchronous double-liquid grouting quality evaluation method for shield construction. Background The urban underground space is reasonably developed and utilized, the optimization of the urban space structure and the improvement of urban traffic conditions are facilitated, and the urban underground space and urban underground space comprehensive transportation system has important significance in promoting the synchronous development of the underground space and the urban whole, promoting the coordinated development of urban epitaxial expansion and connotation promotion and improving the comprehensive bearing capacity of the urban. The shield method has the advantages of small influence on surrounding environment, high automation degree, rapid construction, high quality, high efficiency, safety, environmental protection and the like, and is widely applied and developed in the field of underground engineering construction in China, especially subway construction. In the shield tunneling process, the generation of the excavation gap is an important cause of stratum deformation, and the soil body at the upper part of the shield tail can be effectively prevented from slumping by filling the excavation gap with slurry with good performance, so that the subsidence of the earth surface is controlled. Synchronous grouting is also beneficial to the attitude control of the shield and the improvement of the tunnel splicing quality. The double-liquid slurry is different from the single-liquid slurry in that the two components are different, the double-liquid slurry comprises cement, bentonite, a stabilizer, water and the like, the single-liquid slurry comprises cement, sand and water, the two components have different gelation times, the early strength of the double-liquid slurry is high, the gelation time is short, the single-liquid slurry has good fluidity and high strength after solidification, the two components have different stability, the double-liquid slurry is easy to block a pipe and has poor durability, and the single-liquid slurry is easy to be diluted by underground water. Therefore, the single-fluid-slurry quality evaluation method is not suitable for the evaluation of double-fluid slurries. The double-liquid slurry has better compactness and impermeability in practical engineering due to the advantages of short gel time, high consolidation strength and the like, but different proper proportions of slurry are needed under different stratum and construction conditions. At present, the domestic shield construction adopts fewer double-slurry synchronous grouting cases, the requirements of different geological environments on the double-slurry performance are different, and a double-slurry performance index system and a double-slurry performance index method for the domestic shield construction are not perfected. In order to fully play the advantages of the double-liquid slurry in engineering, it is necessary to formulate a scientific and reasonable synchronous double-liquid slurry quality evaluation method. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a synchronous double-liquid grouting quality evaluation method for shield construction, which comprises the following steps: The invention provides a synchronous double-liquid grouting quality evaluation method for shield construction, which comprises the following steps: S1, selecting a plurality of performance indexes for implementing double-liquid slurry as first-level evaluation indexes according to grouting performance requirements of the double-liquid slurry, and determining associated second-level evaluation indexes to which each first-level evaluation index belongs; s2, establishing an evaluation index hierarchical structure model by using a hierarchical analysis method according to the division of evaluation indexes of each level, and obtaining the corresponding weight of each level index of the evaluation index hierarchical structure model; s3, formulating a scoring standard associated with the second-level evaluation index and an evaluation grade of the overall score of the dual-slurry; S4, carrying out parameter measurement on the double-liquid slurry to be tested according to each second-level evaluation index, scoring and inputting the double-liquid slurry to be tested to the evaluation index hierarchical structure model according to the scoring standard, and combining the corresponding weights of each hierarchical index to obtain a final score; S5, obtaining a corresponding evaluation grade according to the final score of the double-liquid slurry to be tested, judging whether the evaluation grade meets the grade required by the corresponding engineering, if so, judging that the performance of the doubl