A method for evaluating the effect of grouting plugging and reinforcement

Abstract

This invention belongs to the field of grouting evaluation technology, specifically relating to a method for evaluating the effect of grouting sealing and reinforcement. The method includes: S1. Determining the influencing factors of the grouting sealing and reinforcement effect; establishing a hierarchical evaluation level for grouting sealing based on these influencing factors; S2. Establishing a judgment matrix for the influencing factors based on the hierarchical evaluation level, assigning importance values ​​to each influencing factor, and calculating the weight vector of the judgment matrix; S3. Verifying the consistency of the judgment matrix; S4. Determining the influence weights of secondary evaluation indicators on the grouting sealing evaluation level, establishing an evaluation matrix through primary and secondary evaluation indicators, assigning specific numerical values ​​to the evaluation levels, and using the fuzzy matrix single-valued method to determine the sealing and reinforcement effect of fractured and fissured sudden water inrush. This improves the systematicness and accuracy of the grouting sealing and reinforcement effect evaluation method.

Description

Technical Field

[0001] This invention belongs to the field of grouting evaluation technology, specifically relating to a method for evaluating the effect of grouting sealing and reinforcement. Background Technology

[0002] Currently, fault grouting reinforcement involves using pump pressure to force or penetrate grout into fractures. After solidification, the grout fills the fractures in solid form and bonds with the rock mass. This filling material forms a new network framework structure within the rock mass, with a uniform and dense rock mass inside. The filling material forming the network framework has good elastic bond strength. Under the same stress, the rock mass reaches its ultimate strength without grouting; while the grouted rock mass is in a stable state with improved self-supporting capacity. Therefore, grouting reinforcement improves the macroscopic mechanical properties of the rock mass, increases its density and strength, further enhances its ductility, and strengthens its resistance to deformation, enabling it to maintain sufficient strength under large deformation conditions.

[0003] Evaluating the grouting effect is also an extremely important step. Currently, the main methods for evaluating the grouting effect include borehole pumping (pressure) water inspection, water volume comparison before and after grouting, and sampling inspection. However, most of these methods are quite complex in practice, involve a large amount of engineering work, and have many influencing factors, making it difficult to evaluate the grouting effect in a more reasonable and intuitive way.

[0004] The current method for evaluating the effectiveness of grouting and sealing reinforcement relies mainly on "personal experience design," and the systematicness and accuracy of the evaluation method need to be improved. Summary of the Invention

[0005] To address the technical problem that "current evaluation methods for grouting and sealing reinforcement effects mainly rely on 'personal experience-based design,' and the systematicness and accuracy of these evaluation methods need improvement," this invention provides the following technical solution: A method for evaluating the effectiveness of grouting sealing and reinforcement includes: S1. Based on the analysis of the impact of various influencing factors on grouting and sealing reinforcement, and combined with the characteristics of fractured fissure-type sudden water inrush and the safety requirements of construction excavation, the evaluation influencing factors of grouting and sealing reinforcement effect are determined. The evaluation influencing factors include primary evaluation indicators and secondary evaluation indicators. Based on the evaluation influencing factors, the grouting and sealing evaluation level is determined, and the grouting and sealing evaluation level hierarchy is established. S2. Based on the grouting and sealing evaluation level hierarchy in step S1, establish a judgment matrix for the evaluation influencing factors, assign values ​​to the importance of each evaluation influencing factor, and calculate the weight vector of the judgment matrix; S3. Find the largest eigenvalue corresponding to the weight vector in step S2, calculate the consistency index CI using the largest eigenvalue, introduce the average random consistency index RI to correct the CI value, obtain the consistency ratio CR, and use CR to comprehensively evaluate the consistency degree of the judgment matrix. S4. Determine the influence weights of the secondary evaluation indicators on the grouting and sealing evaluation level. Establish an evaluation matrix through the quantified secondary evaluation indicators. The evaluation matrix is ​​evaluated by the primary and secondary evaluation indicators. Assign specific values ​​to the evaluation level. Use the fuzzy matrix single-value method to determine the sealing and reinforcement effect of fractured and fissured sudden water inrush.

[0006] Further, in step S1, the four indicators of grouting volume, PQt curve, water inflow, and geophysical exploration are defined as primary evaluation indicators; the secondary evaluation indicators are composed of the factors that affect the primary evaluation indicators. The secondary evaluation indicators of grouting volume include the grouting volume per borehole and the matching of grouting volume with the formation; the secondary evaluation indicators of PQt curve include the Pt curve and the Qt curve; the secondary evaluation indicators of geophysical exploration methods include ground-penetrating radar method and transient electromagnetic method; based on the value and type of each secondary evaluation indicator, the grouting sealing level is determined and divided into four levels: excellent, good, medium, and poor.

[0007] Furthermore, in step S2, the importance of each evaluation factor is assigned a value, specifically by using a 1-9 level proportional scale to assign the importance of each factor.

[0008] Further, in step S2, the weight vector of the judgment matrix is ​​calculated, including: The judgment matrix is ​​normalized by summation. The average value of each row of the normalized judgment matrix is ​​calculated to obtain the eigenvector corresponding to the largest eigenvalue, which is then used as the weight vector.

[0009] Furthermore, in step S3, the consistency index RI is used to correct the CI value to obtain the consistency ratio CR. The formula for calculating CR is as follows: .

[0010] Furthermore, the consistency of the judgment matrix is ​​comprehensively evaluated using CR, as follows: When CR A CR value of 0.1 indicates acceptable consistency of the judgment matrix; conversely, when CR > 0.1, the judgment matrix is ​​adjusted until a judgment matrix that passes the consistency test is obtained.

[0011] Furthermore, in step S4, the weights of the secondary evaluation indicators on the grouting and sealing evaluation level are as follows: , The weight vector of the primary evaluation index; : Weight vector of secondary evaluation indicators; The weights of the secondary evaluation indicators on the grouting and sealing level, i=1,2,3…….

[0012] Furthermore, the evaluation matrix is ​​evaluated using the primary evaluation indicators: the evaluation matrix of the primary evaluation indicator in each individual evaluation influencing factor is multiplied by the weight vector of its corresponding primary evaluation indicator to obtain the primary evaluation result, and the membership vector of each individual evaluation influencing factor to the comment set is obtained.

[0013] Furthermore, the evaluation matrix is ​​evaluated using secondary evaluation indicators: the weight vector of the secondary evaluation indicators is multiplied by the primary evaluation result to obtain the secondary fuzzy comprehensive evaluation result.

[0014] Furthermore, specific numerical values ​​are assigned to the evaluation levels. In step S5, the sealing criterion level value for the sealing and reinforcement effect is expressed as follows: ; in: a i —Assign evaluation levels in advance; r i Membership degree of the corresponding level in the single-factor / comprehensive evaluation matrix; M: The final calculated single-valued evaluation result is used to determine the grouting grade based on whether M falls within different intervals.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for evaluating the effectiveness of grouting and sealing reinforcement. Based on influencing factors, it establishes a hierarchical evaluation level for grouting and sealing. A judgment matrix is ​​established for each influencing factor. An evaluation matrix is ​​constructed through primary and secondary evaluation indicators, assigning specific numerical values ​​to each evaluation level. The fuzzy matrix single-value method is then used to determine the effectiveness of sealing and reinforcement for fractured and fissured areas prone to sudden water inrush. This invention provides a more reliable, scientific, and feasible method for evaluating the effectiveness of grouting and sealing reinforcement. It overcomes the shortcomings of current methods that rely primarily on "personal experience" for evaluation, improving the systematic nature and accuracy of current grouting and sealing reinforcement effectiveness evaluation methods. Attached Figure Description

[0016] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation

[0017] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0018] like Figure 1 As shown, the present invention provides a method for evaluating the effect of grouting and sealing reinforcement, comprising the following steps: (1) Evaluation of influencing factors: identification and quantification Based on the analysis of the impact of various influencing factors on grouting and sealing reinforcement, and combined with the characteristics of fractured fissure-type sudden water inrush and the safety requirements of construction excavation, the evaluation influencing factors of the grouting and sealing reinforcement effect are determined. The evaluation influencing factors include primary evaluation indicators and secondary evaluation indicators; the grouting volume, PQt curve, water inrush volume, and geophysical exploration are defined as the four primary evaluation indicators. Secondary evaluation indicators are composed of factors that affect primary evaluation indicators. Secondary evaluation indicators for grouting volume include grouting volume per borehole and the matching of grouting volume with formation. Secondary evaluation indicators for PQt curves (pressure-flow-time curves) include Pt curves (pressure-time curves) and Qt curves (flow-time curves). Secondary evaluation indicators for geophysical exploration methods include ground-penetrating radar and transient electromagnetic methods.

[0019] Based on the evaluation of influencing factors, the grouting and sealing evaluation level is determined, and a hierarchical system for grouting and sealing evaluation levels is established. The grouting and sealing evaluation level is divided into four levels: excellent, good, medium and poor. The evaluation level and the quantitative factors affecting the evaluation are shown in Table 1.

[0020] Table 1 Evaluation Levels and Quantification Table

[0021] In Table 1, Q represents the theoretical or benchmark grouting volume calculated based on factors such as geological conditions and design requirements.

[0022] (2) Weight determination method: Based on the grouting and sealing evaluation level hierarchy in step 1, and according to the actual situation of the grouting and sealing evaluation method used in the project and expert opinions, combined with the hierarchical model structure, a judgment matrix A is established for the evaluation influencing factors. The importance of each evaluation influencing factor is assigned using a 1-9 level proportional scale, and the judgment matrix is ​​calculated.

[0023]

[0024] Determine the element a of the matrix ij , i is the row number of the judgment matrix, representing the sequence number of the first-level evaluation indicator; j is the column number of the judgment matrix, representing the sequence number of the second-level evaluation indicator; aij This indicates the relative importance of the j-th secondary evaluation indicator relative to other elements under the i-th primary evaluation indicator.

[0025] The judgment matrix is ​​normalized using the summation method, and the average value of each row element of the normalized judgment matrix is ​​calculated: , This represents the average value of the elements in the i-th row of the judgment matrix; i = 1, 2, 3, ..., n j = 1, 2, 3, ..., n; n is the order of the judgment matrix, that is, the number of primary or secondary evaluation indicators.

[0026] The eigenvector corresponding to the largest eigenvalue is obtained, i.e., the weight vector. , (3) Consistency check: Find the largest eigenvalue corresponding to the weight vector in step 2, calculate the consistency index CI using the largest eigenvalue, and use the consistency index CI to measure the degree of consistency: , , This is the largest eigenvalue corresponding to the weight vector.

[0027] Since people have a certain degree of subjective understanding of objective things, it is insufficient to judge the consistency of a matrix solely based on the value of CI. Therefore, the average random consistency index RI is used to correct the CI value, obtaining the consistency ratio CR. CR is then used to comprehensively evaluate the degree of consistency of the matrix. , When CR A value of 0.1 indicates that the judgment matrix has acceptable consistency; otherwise, it needs to be adjusted to obtain a judgment matrix that passes the consistency test.

[0028] (4) Fuzzy comprehensive evaluation: ① Determine the weighting of the secondary evaluation indicators on the grouting sealing level: , The weight vector of the primary evaluation index determined by judgment matrix A; The weight vector of the secondary evaluation index determined by judgment matrix A; The weighting of the secondary evaluation indicators on the grouting sealing level; ② By utilizing the influence weights of secondary evaluation indicators on the grouting and sealing level, the secondary evaluation indicators are quantified, and an evaluation matrix R is established using the quantified secondary evaluation indicators. A As shown in Table 2.

[0029] Table 2 Single-factor fuzzy evaluation matrix

[0030] a. Evaluation of primary evaluation indicators: The evaluation matrix is ​​evaluated based on the primary evaluation indicators of the single evaluation influencing factors. The evaluation matrix of the primary evaluation indicators in each individual evaluation influencing factor. With the corresponding first-level evaluation index weight vector W A Multiplying these results yields the first-level evaluation result R', which in turn derives the membership vector of each individual evaluation influencing factor to the comment set, i.e.: ; R'={R i}={W A × R Ai}; W A ={ }; R A ={R Ai}; R A This refers to the single-factor evaluation matrix of all secondary evaluation indicators under the i-th primary evaluation indicator, which is the matrix formed by the row data of the corresponding primary evaluation indicators in Table 2.

[0031] b. Evaluation of secondary evaluation indicators: The first-level evaluation result R' and its corresponding weight vector W A Multiplying them together yields the second-level fuzzy comprehensive evaluation result: , R' represents the first-level evaluation result, which is used as a single-factor evaluation set to form a single-factor / comprehensive evaluation matrix.

[0032] c. Evaluation of grouting and sealing effect: Assign specific numerical values ​​to the evaluation level ...and the results of the second-level fuzzy comprehensive evaluation, the fuzzy matrix single-valued method is used to determine the sealing and reinforcement effect of fractured and fissured sudden water inrush. The sealing criterion level value is expressed as: , in: a i —Assign evaluation levels (Excellent, Good, Average, Poor) in advance; ri : Membership degree of the corresponding level in the single-factor / comprehensive evaluation matrix, R={r i}; M: The final calculated single-valued evaluation result is used to determine the grouting grade based on whether M falls within different intervals.

[0033] Table 3. Evaluation Table of Grout Injectability

[0034] The above technical features constitute the preferred embodiment of the present invention, which has strong adaptability and optimal implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the needs of different situations.

[0035] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A method for evaluating the effect of grouting and sealing reinforcement, characterized in that, include: S1. Based on the analysis of the impact of various influencing factors on grouting and sealing reinforcement, and combined with the characteristics of fractured fissure-type sudden water inrush and the safety requirements of construction excavation, the evaluation influencing factors of grouting and sealing reinforcement effect are determined. The evaluation influencing factors include primary evaluation indicators and secondary evaluation indicators. Based on the evaluation influencing factors, the grouting and sealing evaluation level is determined, and the grouting and sealing evaluation level hierarchy is established. S2. Based on the grouting and sealing evaluation level hierarchy in step S1, establish a judgment matrix for the evaluation influencing factors, assign values ​​to the importance of each evaluation influencing factor, and calculate the weight vector of the judgment matrix; S3. Find the largest eigenvalue corresponding to the weight vector in step S2, calculate the consistency index CI using the largest eigenvalue, introduce the average random consistency index RI to correct the CI value, obtain the consistency ratio CR, and use CR to comprehensively evaluate the consistency degree of the judgment matrix. S4. Determine the influence weights of the secondary evaluation indicators on the grouting and sealing evaluation level. Establish an evaluation matrix through the quantified secondary evaluation indicators. The evaluation matrix is ​​evaluated by the primary and secondary evaluation indicators. Assign specific values ​​to the evaluation level. Use the fuzzy matrix single-value method to determine the sealing and reinforcement effect of fractured and fissured sudden water inrush.

2. The method for evaluating the effect of grouting and sealing reinforcement according to claim 1, characterized in that, In step S1, the four indicators of grouting volume, PQt curve, water inflow, and geophysical exploration are defined as primary evaluation indicators. Secondary evaluation indicators are composed of factors that affect the primary evaluation indicators. The secondary evaluation indicators of grouting volume include the grouting volume per borehole and the matching of grouting volume with the formation. The secondary evaluation indicators of PQt curve include the Pt curve and the Qt curve. The secondary evaluation indicators of geophysical exploration methods include ground-penetrating radar method and transient electromagnetic method. Based on the value and type of each secondary evaluation indicator, the grouting sealing level is determined and divided into four levels: excellent, good, medium, and poor.

3. The method for evaluating the effect of grouting and sealing reinforcement according to claim 1, characterized in that, In step S2, the importance of each evaluation factor is assigned a value, specifically by using a 1-9 level proportional scale to assign the importance of each factor.

4. The method for evaluating the effect of grouting and sealing reinforcement according to claim 1, characterized in that, In step S2, the weight vector of the judgment matrix is ​​calculated, including: The judgment matrix is ​​normalized by summation. The average value of each row of the normalized judgment matrix is ​​calculated to obtain the eigenvector corresponding to the largest eigenvalue, which is then used as the weight vector.

5. The method for evaluating the effect of grouting and sealing reinforcement according to claim 1, characterized in that, In step S3, the consistency index RI is used to correct the CI value to obtain the consistency ratio CR. The formula for calculating CR is as follows: 。 6. The method for evaluating the effect of grouting and sealing reinforcement according to claim 5, characterized in that, The consistency of the judgment matrix is ​​evaluated using CR as follows: When CR A CR value of 0.1 indicates acceptable consistency of the judgment matrix; conversely, when CR > 0.1, the judgment matrix is ​​adjusted until a judgment matrix that passes the consistency test is obtained.

7. The method for evaluating the effect of grouting and sealing reinforcement according to claim 1, characterized in that, In step S4, the weights of the secondary evaluation indicators on the grouting and sealing evaluation level are as follows: ， The weight vector of the primary evaluation index; : Weight vector of secondary evaluation indicators; The weights of the secondary evaluation indicators on the grouting and sealing level, i=1,2,3…….

8. The method for evaluating the effect of grouting and sealing reinforcement according to claim 7, characterized in that, The evaluation matrix is ​​obtained by multiplying the evaluation matrix of the first-level evaluation index of each individual evaluation influencing factor with the weight vector of its corresponding first-level evaluation index to obtain the first-level evaluation result and derive the membership vector of each individual evaluation influencing factor to the comment set.

9. The method for evaluating the effect of grouting sealing and reinforcement according to claim 8, characterized in that, The evaluation matrix is ​​obtained by multiplying the weight vector of the secondary evaluation index with the primary evaluation result to obtain the secondary fuzzy comprehensive evaluation result.

10. The method for evaluating the effect of grouting and sealing reinforcement according to claim 9, characterized in that, Assigning specific numerical values ​​to the evaluation level, the sealing criterion level value for the sealing and reinforcement effect in step S5 is expressed as follows: ； in: a i —Assign evaluation levels in advance; r i Membership degree of the corresponding level in the single-factor / comprehensive evaluation matrix; M: The final calculated single-valued evaluation result is used to determine the grouting grade based on whether M falls within different intervals.

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