CN114841532A - Safety evaluation method and system for surface subsidence in shield excavation process - Google Patents
Safety evaluation method and system for surface subsidence in shield excavation process Download PDFInfo
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Abstract
The invention belongs to the technical field of tunnels, and particularly relates to a safety evaluation method and system for surface subsidence in a shield excavation process. The evaluation method comprises the following steps: constructing a safety evaluation model of the earth surface in the shield excavation process based on construction data of historical tunnel shield construction projects; constructing a judgment matrix of each safety risk factor based on an analytic hierarchy process, and determining the weight of each safety risk factor; constructing a judgment matrix for the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership function and the weight of each safety risk factor, and performing fuzzy comprehensive judgment; and determining the safety risk level of the surface subsidence in the current shield excavation process of the target shield construction project according to the maximum membership principle based on the evaluation result of the fuzzy comprehensive evaluation. The scheme of the invention can accurately and quantitatively evaluate the safety of surface subsidence in the shield excavation process.
Description
Technical Field
The invention belongs to the technical field of tunnels, and particularly relates to a safety evaluation method and system for surface subsidence in a shield excavation process.
Background
The evaluation of the surface subsidence safety in the shield excavation and tunneling process has important significance for reasonably selecting a construction process and controlling catastrophe, the shield excavation and tunneling process is a repeated unloading-loading process, the process breaks the original balance of surrounding soil bodies, the loss of stratum soil bodies is caused, the soil bodies can generate stress release and movement, and further deformation of the surface and surrounding buildings is caused, so that the evaluation of the deformation generated by the disturbance of the shield excavation construction for passing through an operating railway is necessary, and more underground projects carry out project safety risk evaluation work. The Qihu academician confirms the role and importance of engineering risk assessment, and provides valuable suggestions for the problems existing in the current safety risk assessment of China. The current risk assessment method mainly comprises the following steps: expert survey and analytic hierarchy process, WBS method and fault tree method, ground settlement evaluation theory and method, fuzzy membership curve method, Bayesian network risk evaluation and the like. The evaluation factors and the weight parameters of the technical conditions of the earth surface in the operation period of 3 typical national provinces in a certain province are determined by using an analytic hierarchy process, and are compared and analyzed with a normative process, so that the disease condition and various technical conditions of the earth surface in the operation period of the highway can be objectively and more specifically reflected by using the analytic hierarchy process; the method comprises the following steps of determining the weight of each influence index by combining an entropy weight method and a scaling method by applying an analytic hierarchy process to the Huqun Fang and the like, and establishing a set of theoretical system for evaluating the safety level of the highway tunnel structure; determining index weight by combined layer Analysis (AHP) of Youguan clean and the like, establishing a variable fuzzy set evaluation model for evaluating the dam break environmental influence, and taking the dam of the sand river water-collecting reservoir as an engineering example for verification.
In summary, although the risk assessment method has been widely applied to foundation pit, slope and roadway engineering, the reliability of the assessment result is generally accepted. The existing evaluation methods of the ground surface settlement caused by shield construction comprise fuzzy comprehensive evaluation, machine learning, artificial neural network and the like. However, the influence factors of the ground surface settlement caused by shield construction are complex, and the reliability and the applicability of the conventional evaluation method have the limitations of unreasonable safety evaluation factors, low model calculation precision, poor reliability and the like.
Therefore, it is necessary to provide an improved technical solution for quantitatively evaluating the safety of the ground surface settlement in the shield excavation process to solve the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a safety evaluation method and a safety evaluation system for surface subsidence in the shield excavation process, and aims to accurately and quantitatively evaluate the safety of the surface subsidence in the shield excavation process.
In order to achieve the above purpose, the invention provides the following technical scheme:
a safety evaluation method for surface subsidence in a shield excavation process comprises the following steps:
step S10, constructing a safety evaluation model of the earth surface in the shield excavation process based on construction data of historical tunnel shield construction projects, wherein the safety evaluation model comprises safety risk factors, safety risk levels and membership functions corresponding to the safety risk levels;
step S20, constructing a judgment matrix of each safety risk factor based on an analytic hierarchy process, and determining the weight of each safety risk factor;
step S30, constructing a judgment matrix for the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership function and the weight of each safety risk factor, and performing fuzzy comprehensive judgment;
and step S40, determining the safety risk level of the surface subsidence in the current shield excavation process of the target shield construction project based on the evaluation result of the fuzzy comprehensive evaluation and according to the maximum membership principle.
Optionally, in step S10, the safety risk factors are divided into three levels, where the first level factors include internal factors and external factors, the second level factors include tunnel position, tunnel size, support pressure and friction, and the third level factors include shield diameter to tunnel burial depth ratio, reciprocal distance of tunnel from building, tunnel diameter, grouting pressure, tunnel face pressure, jack thrust and friction coefficient.
Optionally, in step S10, the security risk levels include four security risk levels, and the membership function a corresponding to the four security risk levels 1 (δ)、A 2 (δ)、A 3 (δ)、A 4 (δ) are respectively:
wherein, delta 1 、δ 2 、δ 3 The control values of the safety risk factors respectively correspond to the shield excavation engineering under the corresponding safety risk level, and delta is the monitoring value of the safety risk factors under the corresponding safety risk level.
Optionally, in step S20, specifically, a judgment matrix is constructed for each safety risk factor by using a 1-9 scaling method based on an analytic hierarchy process, and a feature vector corresponding to the maximum feature value is taken as a weight.
Optionally, in step S20, in the first hierarchy factor, the weights of the internal and external factors are 0.6 and 0.4, respectively; in the second level factor, the tunnel position and the tunnel size are 0.667 and 0.333 respectively; the supporting pressure and the friction force are respectively 0.8 and 0.2; in the third level factor, the weight of the shield diameter to the tunnel burial depth, the reciprocal of the distance from the tunnel to the building and the tunnel diameter are respectively 0.4, 0.6 and 1, and the weight of the grouting pressure, the tunnel face pressure, the jack thrust and the friction coefficient are respectively 0.4, 0.3 and 1.
Optionally, step S30 specifically includes:
calculating the membership degree of each safety risk factor monitored in the current shield excavation process of the target shield construction project corresponding to four safety risk levels based on the membership degree function;
and performing hierarchical structure judgment matrix on the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership degree of each safety risk factor and the weight of each safety risk factor, and performing fuzzy comprehensive judgment.
Optionally, based on the membership of each safety risk factor and the weight of each safety risk factor, performing hierarchical structure evaluation matrix on the safety risk factors monitored in the current shield excavation process of the target shield construction project, and performing fuzzy comprehensive evaluation, specifically:
constructing a judgment matrix R of the third-level factors based on the membership degree of the third-level factors in the current shield excavation process of the target shield construction project 11 ，R 12 ，R 21 ，R 22 Wherein R is 11 A matrix constructed by membership degrees of two factors of the ratio of the diameter of the shield to the buried depth of the tunnel and the reciprocal of the distance of the tunnel from the building, R 12 Matrices constructed for membership of tunnel diameters, R 21 Is a matrix of membership degree construction of three factors of grouting pressure, tunnel face pressure and jack thrust, R 22 A matrix constructed for membership of coefficient of friction;
judging matrix R according to third level factor 11 ，R 12 ，R 21 ，R 22 And corresponding weight A 11 ，A 12 ，A 21 ，A 22 And calculating to obtain a fuzzy comprehensive judgment result B of the third-level factor 11 ＝A 11 R 11 ，B 12 ＝A 12 R 12 ，B 21 ＝A 21 R 21 ，B 22 ＝A 22 R 22 ；
Constructing a judgment matrix of the second level factor as R 1 ＝(B 11 ，B 12 ) T ，R 2 ＝(B 21 ，B 22 ) T ；
Judging matrix R according to second level factor 1 ，R 2 And corresponding weight A 1 ，A 2 And calculating to obtain a fuzzy comprehensive judgment result B of the second-level factors 1 ＝A 1 R 1 ，B 2 ＝A 2 R 2 ；
Constructing a judgment matrix of the first level factor as R ═ B 1 ，B 2 ) T ；
And calculating to obtain a fuzzy comprehensive evaluation result B of the first-level factor, namely AR, according to the evaluation matrix R of the first-level factor and the corresponding weight A.
Optionally, in step S40, the safety risk level of the ground surface settlement in the current shield excavation process of the target shield construction project is determined according to the maximum membership rule based on the fuzzy comprehensive evaluation result B of the first-level factor.
The invention also provides a safety evaluation system for surface subsidence in the shield excavation process, which comprises the following steps:
the construction unit is configured to construct a safety evaluation model of the earth surface in the shield excavation process based on construction data of historical tunnel shield construction projects, wherein the safety evaluation model of the earth surface comprises safety risk factors, safety risk levels and membership functions corresponding to the safety risk levels;
the weight determining unit is configured to construct a judgment matrix of each safety risk factor based on an analytic hierarchy process and determine the weight of each safety risk factor;
the evaluation unit is configured to construct an evaluation matrix for the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership function and the weight of each safety risk factor, and perform fuzzy comprehensive evaluation;
and the safety risk level determining unit is configured to determine the safety risk level of the surface subsidence in the shield excavation process of the target shield construction project based on the evaluation result of the fuzzy comprehensive evaluation and according to the maximum membership principle.
Optionally, the evaluation unit comprises a calculation subunit and an evaluation subunit, wherein,
the calculation subunit is configured to calculate the membership degree of each safety risk factor monitored in the current shield excavation process of the target shield construction project based on the membership degree function;
the evaluation subunit is configured to perform hierarchical structure evaluation matrix on the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership degree of each safety risk factor and the weight of each safety risk factor, and perform fuzzy comprehensive evaluation.
Has the advantages that:
the safety evaluation method for ground surface settlement in the shield excavation process comprises the steps of firstly, constructing a safety evaluation model of the ground surface in the shield excavation process based on construction data of historical tunnel shield construction projects, wherein the safety evaluation model comprises safety risk factors, safety risk levels and membership functions corresponding to the safety risk levels, then constructing a judgment matrix of each safety risk factor based on an analytic hierarchy process, and determining the weight of each safety risk factor; and then constructing a judgment matrix for the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership function and the weight of each safety factor, carrying out fuzzy comprehensive judgment, and finally determining the safety risk level of the surface subsidence in the current shield excavation process of the target shield construction project based on the judgment result of the fuzzy comprehensive judgment and according to the maximum membership principle. The technical scheme of the invention adopts an analytic hierarchy process and a fuzzy comprehensive evaluation method, and combines the data monitored in the current shield excavation process of a target shield construction project to quantitatively evaluate the safety condition of the surface subsidence in the current shield excavation process, and the evaluation result obtained by the method is consistent with the actual condition; and the method has simple process and is easy to be actually operated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic flow chart of a method for evaluating safety of surface subsidence during shield excavation according to some embodiments of the present invention;
fig. 2 illustrates safety risk factors for surface subsidence during shield excavation according to some embodiments of the present invention;
fig. 3 is a functional block diagram of a safety evaluation system for surface subsidence during shield excavation according to some embodiments of the present invention;
fig. 4 is a functional block diagram of a judging unit in the safety evaluation system for surface subsidence in the shield excavation process according to some embodiments of the present invention.
Reference numbers in the figures: 100-a building unit; 200-a weight determination unit; 300-a judging unit; 310-a calculation subunit; 320-judging subunit; 400-security risk level determination unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Aiming at the defects in the prior art, the invention provides a method and a system for evaluating the safety of surface subsidence in the shield excavation process, aiming at accurately and quantitatively evaluating the safety of the surface subsidence in the shield excavation process.
Fig. 1 is a schematic flow chart of a method for evaluating safety of surface subsidence in a shield excavation process according to some embodiments of the present invention, and as shown in fig. 1, the method for evaluating safety of surface subsidence in a shield excavation process according to the present invention includes the following steps:
and step S10, constructing a safety evaluation model of the earth surface in the shield excavation process based on the construction data of the historical tunnel shield construction project, wherein the safety evaluation model comprises safety risk factors, safety risk levels and membership functions corresponding to the safety risk levels.
Step S20, constructing a judgment matrix of each safety risk factor based on an analytic hierarchy process, and determining the weight of each safety risk factor;
step S30, constructing a judgment matrix for the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership function and the weight of each safety risk factor, and performing fuzzy comprehensive judgment;
and step S40, determining the safety risk level of the surface subsidence in the current shield excavation process of the target shield construction project based on the evaluation result of the fuzzy comprehensive evaluation and according to the maximum membership principle.
The safety evaluation method for ground surface settlement in the shield excavation process comprises the steps of firstly, building a safety evaluation model of the ground surface in the shield excavation process based on construction data of historical tunnel shield construction projects (namely experience summary of tunnel shield construction), wherein the safety evaluation model comprises safety risk factors, safety risk grades and membership functions corresponding to the safety risk grades, then building a judgment matrix of each safety risk factor based on an analytic hierarchy process, and determining the weight of each safety risk factor; and then constructing a judgment matrix for the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership function and the weight of each safety factor, carrying out fuzzy comprehensive judgment, and finally determining the safety risk level of the ground surface settlement in the current shield excavation process of the target shield construction project based on the judgment result of the fuzzy comprehensive judgment and the maximum membership principle. The technical scheme of the invention adopts an analytic hierarchy process and a fuzzy comprehensive evaluation method, and combines the data monitored in the current shield excavation process of a target shield construction project to quantitatively evaluate the safety condition of the surface subsidence in the current shield excavation process, and the evaluation result obtained by the method is consistent with the actual condition; and the method has simple process and is easy to be actually operated.
It should be noted that the construction data of the historical shield construction project may be the early shield construction data of the same construction tunnel as the target shield construction project, or may be the historical shield construction project of a construction tunnel of a different project, which is not limited herein and is within the protection scope of the present invention.
In the embodiment of the invention, a subway line four in a certain city is taken as an engineering background, for example, after a line in a section plane of a line of a 17-segment line of the subway line four in a certain city is sent out from a creative station, the line is laid from north to south, and after the line penetrates through a high level of a scholar house in the south county, a power pipe gallery and a felter Tungfolk house from bottom to south, the line is turned to west for laying, and after the line penetrates through a rainwater pipe, a sewage pipe and a five-seat high-speed railway bridge, the line is conveyed to a parking lot. The soil around the tunnel is loosened and sunk due to the shield construction, and the soil is visually expressed as settlement or uplift. The structures in the area near the tunnel affected by the deformation, settlement or displacement of the structures, so that the structures are damaged or destroyed.
Acquiring construction data in the early shield excavation process of a four-line underground tunnel, comprehensively analyzing the acquired construction data, and dividing safety risk factors of surface subsidence in the shield excavation process into an internal factor and an external factor, wherein the internal factor can be divided into a tunnel position and a tunnel size, the external factor can be divided into supporting pressure and friction force, and the tunnel position can be divided into a tunnel shield diameter and buried depth ratio and a tunnel distance upper building distance; the tunnel size is mainly the diameter of the shield; the supporting pressure can be divided into grouting pressure, tunnel face pressure and jack thrust; the friction force is mainly determined by the friction coefficient between the soil and the shield machine. That is, as shown in fig. 2, the safety risk factors are divided into three levels, wherein the first level factors include internal factors and external factors, the second level factors include tunnel position, tunnel size, support pressure and friction, and the third level factors include the ratio of shield diameter to tunnel burial depth, the distance of the tunnel from the building, tunnel diameter, grouting pressure, face pressure, jack thrust and friction coefficient.
Establishing a three-level fuzzy comprehensive evaluation model according to the security risk factors of fig. 2, wherein the security risk factors of three levels are specifically:
the first layer is as follows: u ═ u 1 ，u 2 )；
And a second level: u. of 1 ＝(c 1 ，c 2 )；u 2 ＝(c 3 ，c 4 )；
And a third level: c. C 1 ＝(w 1 ，w 2 )；c 2 ＝(w 3 )；c 3 ＝(w 4 ，w 5 ，w 6 )；c 4 ＝(w 7 )。
Wherein u is 1 Is the internal cause of u 2 Is an external cause, c 1 Is referred to as the tunnel location, c 2 Is referred to as the tunnel size, c 3 Is the support pressure, c 4 Means friction force; w is a 1 Is the ratio of the diameter of the shield to the buried depth of the tunnel, w 2 Is the reciprocal of the distance, w, of the tunnel from the building 3 Is referred to as the tunnel diameter, w 4 Is referred to as grouting pressure, w 5 Refers to the face pressure, w 6 Is the thrust of a jack, w 7 Refers to the coefficient of friction.
Further, according to the acquired construction data, the safety risk levels of the ground surface settlement in the shield excavation process are divided into four safety risk levels, namely safety, relatively safety, danger and relatively danger, and each safety risk level corresponds to the control value of each safety risk factor, which is shown in table 1.
TABLE 1 Security Risk factors and Security Risk level
Furthermore, the membership degree function is adopted to represent the membership degree of the safety risk factors of the ground surface settlement to the safety risk level in the shield excavation process, and the larger the membership degree function is, the higher the corresponding membership degree is. In a particular embodiment of the present invention, the,
membership function A corresponding to four security risk levels 1 (δ)、A 2 (δ)、A 3 (δ)、A 4 (δ) are respectively:
wherein, delta 1 、δ 2 、δ 3 The control values of the safety risk factors respectively correspond to the shield excavation engineering under the corresponding safety risk level, and delta is the monitoring value of the safety risk factors under the corresponding safety risk level.
As can be seen from Table 1, the control values of the shield diameter and the tunnel burial depth ratio in the shield excavation engineering are respectively 0.3, 0.5 and 1 (i.e. delta) 1 、δ 2 、δ 3 0.3, 0.5, 1), respectively); the control values of the reciprocal of the distance between the tunnel and the building are 0.05, 0.1 and 0.2 respectively; the control values of the tunnel diameters are 2, 4 and 7 respectively; the control values of the grouting pressure are 0.35, 0.64 and 1 respectively; the control values of the face pressure are 0.2, 0.45 and 0.8 respectively; the control values of the jack thrust are 1, 1.5 and 2 respectively; the control values of the friction coefficient are 0.25, 0.45 and 0.65 respectively.
In the embodiment of the present invention, step S20 is specifically to construct a judgment matrix for each safety risk factor by using a 1-9 scale method based on an analytic hierarchy process, and take a feature vector corresponding to the maximum feature value as a weight, and perform a consistency check. The first-level security risk factor structural matrix and the weight are shown in table 2, the second-level security risk factor internal cause structural matrix and the weight are shown in table 3, and the second-level security risk factor external cause structural matrix and the weight are shown in table 4.
TABLE 2 first-layer evaluation factor construction matrix and weights
Table 3 internal cause construction matrix and weights
TABLE 4 extrinsic factor construction matrix and weights
As the tunnel size only depends on the shield diameter and the friction only depends on the friction coefficient, the corresponding weight is 1; in the third level safety risk factors, the ratio of the shield diameter to the tunnel burial depth, the reciprocal of the distance from the tunnel to the building and the weight of the shield diameter are respectively 0.4, 0.6 and 1, and the weights of the grouting pressure, the tunnel face pressure and the jack thrust are respectively 0.4, 0.3 and 0.3. It should be noted that, after obtaining the maximum eigenvalue and eigenvector of the judgment matrix, consistency check is performed, and the checking method is as follows:
(1) the consistency check index CI is calculated according to the following formula:
in the formula: CI is a consistency test index; lambda [ alpha ] max Judging the maximum eigenvalue of the matrix; n is the judgment matrix dimension. Constructing a matrix result according to the judgment factors of each layer to obtain the maximum eigenvalue lambda of the judgment factor judgment matrix of each layer max And substituting the obtained result into the formula to obtain the consistency test index CI.
(2) The average random consistency index RI is determined according to table 5.
TABLE 5 average random consistency index RI
(3) The consistency ratio CR is found according to the following formula:
obtaining the CR value of each layer of judgment factors according to the formula, and when CR is less than 0.1, the overall consistency of the judgment matrix can be considered to be acceptable, and the characteristic vector of the judgment matrix can be used as a weight vector; otherwise, the constructed judgment matrix needs to be properly corrected so as to have overall consistency.
In an embodiment of the present invention, step S30 specifically includes:
calculating the membership degree of each safety risk factor monitored in the current shield excavation process of the target shield construction project based on the membership degree function;
and performing hierarchical structure judgment matrix on the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership degree of each safety risk factor and the weight of each safety risk factor, and performing fuzzy comprehensive judgment.
Step S30 will be described in detail with reference to specific construction items.
Table 6 shows the data of each safety risk factor monitored in the current shield excavation process of a subway four-line tunnel (i.e., a target shield construction project) in a certain city.
TABLE 6 monitoring data for various safety risk factors
According to the monitoring data of each safety risk factor in the table 6 and the membership function corresponding to each safety risk grade, corresponding safety factors are obtained through calculationThe degree of membership of the total risk factor. For example, the monitoring value (M1) of the shield diameter to tunnel burial depth ratio is 0.4, that is, δ is 0.4, δ 1 、δ 2 、δ 3 The index control values corresponding to safer, dangerous and extremely dangerous indexes of the shield excavation project in table 1 are respectively 0.3, 0.5 and 1. The membership degrees of the shield diameter and the tunnel burial depth corresponding to the four safety risk levels are 0.5, 1, 0.5 and 0.14 respectively. The membership of each of the following security risks corresponding to four security risk levels can be calculated.
Constructing a judgment matrix R of the third-level factors based on the membership degree of the third-level factors in the current shield excavation process of the target shield construction project 11 ，R 12 ，R 21 ，R 22 Wherein R is 11 A matrix constructed by membership degrees of two factors of the ratio of the diameter of the shield to the buried depth of the tunnel and the reciprocal of the distance of the tunnel from the building, R 12 Matrices constructed for membership of tunnel diameters, R 21 Is a matrix of membership degree construction of three factors of grouting pressure, tunnel face pressure and jack thrust, R 22 The matrix constructed for membership of coefficient of friction is as follows:
R 12 as tunnel diameter as (00.240.140.86)
R 22 Becoming (coefficient of friction) ═ (0.7510.250.13)
Judging matrix R according to third-level factors 11 ，R 12 ，R 21 ，R 22 And corresponding weight A 11 ，A 12 ，A 21 ，A 22 Wherein A is 11 ＝(0.4 0.6)，A 12 ＝1，A 21 ＝(0.4 0.3 0.3)，A 22 Calculating to obtain the third level factor as 1The fuzzy comprehensive evaluation result is as follows:
B 11 ＝A 11 R 11 ＝(0.68 1 0.32 0.18)
B 12 ＝A 12 R 12 ＝(0 0.24 0.14 0.86)
B 21 ＝A 21 R 21 ＝(0.73 0.61 0.16 0.13)
B 22 ＝A 22 R 22 ＝(0.75 1 0.25 0.13)
constructing a judgment matrix of the second level factor as R 1 ＝(B 11 ，B 12 ) T ，R 2 ＝(B 21 ，B 22 ) T Namely:
judging matrix R according to second level factor 1 ，R 2 And corresponding weight A 1 ，A 2 Wherein A is 1 ＝(0.667 0.333)，A 2 And (0.80.2), calculating to obtain a fuzzy comprehensive judgment result B of the second-level factor 1 ＝A 1 R 1 ，B 2 ＝A 2 R 2 Namely:
constructing a judgment matrix of the first level factor as R ═ B 1 ，B 2 ) T Namely:
according to the evaluation matrix R of the first-level factor and the corresponding weight A, wherein A is (0.60.4), calculating to obtain a fuzzy comprehensive evaluation result B of the first-level factor, wherein the fuzzy comprehensive evaluation result B is AR, namely:
further, step S40 is specifically to determine the safety risk level of the ground surface settlement in the current shield excavation process of the target shield construction project according to the maximum membership rule based on the fuzzy comprehensive evaluation result B of the first-level factor.
Specifically, based on the fuzzy comprehensive judgment result B of the first-level factor, the fuzzy subset of the surface subsidence safety risk level in the shield excavation process under the subway fourth-line project tunnel is as follows:
according to the maximum membership principle, the membership degree of the ground surface settlement safety risk level to the second level is the highest in the shield excavation process under the subway No. four project tunnel (0.7201), so that the safety risk level is the second level (namely, safer level) and is in a safer state. According to field verification, the fuzzy comprehensive evaluation result conforms to the actual field situation, the accuracy is high, a targeted construction suggestion is provided for the subsequent tunnel shield excavation process, and the method has important significance for guaranteeing the engineering safety.
Fig. 3 is a functional block diagram of a safety evaluation system for ground subsidence during shield excavation according to some embodiments of the present invention, and as shown in fig. 3, the safety evaluation system of the present invention includes: the system comprises a construction unit 100, a weight determination unit 200, an evaluation unit 300 and a safety risk level determination unit 400, wherein the construction unit 100 is configured to construct a safety evaluation model of the earth surface in the shield excavation process based on construction data of historical tunnel shield construction projects, and the safety evaluation model comprises safety risk factors, safety risk levels and membership functions corresponding to the safety risk levels; a weight determination unit 200 configured to construct a judgment matrix of each safety risk factor based on an analytic hierarchy process, and determine a weight of each safety risk factor; the evaluation unit 300 is configured to construct an evaluation matrix for the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership function and the weight of each safety risk factor, and perform fuzzy comprehensive evaluation; and the safety risk level determination unit 400 is configured to determine the safety risk level of the ground surface settlement in the shield excavation process of the target shield construction project according to the maximum membership degree principle based on the evaluation result of the fuzzy comprehensive evaluation.
Further, as shown in fig. 4, the evaluation unit 300 includes a calculation subunit 310 and an evaluation subunit 320, where the calculation subunit 310 is configured to calculate, based on the membership function, the membership of each safety risk factor monitored in the current shield excavation process of the target shield construction project; the evaluation subunit 320 is configured to perform hierarchical structure evaluation matrix on the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership of each safety risk factor and the weight of each safety risk factor, and perform fuzzy comprehensive evaluation.
The safety evaluation system for ground surface settlement in the shield excavation process provided by the embodiment of the invention can realize the flow and steps of the safety evaluation method for ground surface settlement in the shield excavation process of any embodiment, and achieves the same beneficial effects, and is not repeated herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The safety evaluation method for the surface subsidence in the shield excavation process is characterized by comprising the following steps of:
step S10, constructing a safety evaluation model of the earth surface in the shield excavation process based on construction data of historical tunnel shield construction projects, wherein the safety evaluation model comprises safety risk factors, safety risk levels and membership functions corresponding to the safety risk levels;
step S20, constructing a judgment matrix of each safety risk factor based on an analytic hierarchy process, and determining the weight of each safety risk factor;
step S30, constructing a judgment matrix for the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership function and the weight of each safety risk factor, and performing fuzzy comprehensive judgment;
and step S40, determining the safety risk level of the surface subsidence in the current shield excavation process of the target shield construction project based on the evaluation result of the fuzzy comprehensive evaluation and according to the maximum membership principle.
2. The method of evaluating safety of ground surface subsidence during shield excavation according to claim 1, wherein the safety risk factors are divided into three levels in step S10, wherein the first level factors include internal and external factors, the second level factors include tunnel position, tunnel size, support pressure and friction, and the third level factors include a shield diameter to tunnel burial depth ratio, an inverse of a distance of the tunnel from a building, a tunnel diameter, grouting pressure, tunnel face pressure, jack thrust, and a friction coefficient.
3. The method of evaluating safety of surface subsidence during shield excavation according to claim 2, wherein the safety risk levels include four safety risk levels, and the membership function a corresponding to the four safety risk levels in step S10 1 (δ)、A 2 (δ)、A 3 (δ)、A 4 (δ) are respectively:
wherein, delta 1 、δ 2 、δ 3 The control values of the safety risk factors respectively correspond to the shield excavation engineering under the corresponding safety risk level, and delta is the monitoring value of the safety risk factors under the corresponding safety risk level.
4. The method for evaluating the safety of the ground surface subsidence in the shield excavation process according to claim 2, wherein step S20 is specifically to construct a judgment matrix for each safety risk factor by using a 1-9 scaling method based on an analytic hierarchy process, and to take a feature vector corresponding to a maximum feature value as a weight.
5. The method for evaluating safety of surface subsidence during shield excavation according to claim 4, wherein in step S20, the weights of the internal and external factors in the first-level factor are 0.6 and 0.4, respectively; in the second level factor, the tunnel position and the tunnel size are 0.667 and 0.333 respectively; the supporting pressure and the friction force are respectively 0.8 and 0.2; in the third level factor, the weight of the shield diameter to the tunnel burial depth, the reciprocal of the distance from the tunnel to the building and the tunnel diameter are respectively 0.4, 0.6 and 1, and the weight of the grouting pressure, the tunnel face pressure, the jack thrust and the friction coefficient are respectively 0.4, 0.3 and 1.
6. The method for evaluating the safety of the surface subsidence in the shield excavation process of claim 2, wherein the step S30 is specifically:
calculating the membership degree of each safety risk factor monitored in the current shield excavation process of the target shield construction project corresponding to four safety risk levels based on the membership degree function;
and performing hierarchical structure judgment matrix on the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership degree of each safety risk factor and the weight of each safety risk factor, and performing fuzzy comprehensive judgment.
7. The method for evaluating the safety of the surface subsidence in the shield excavation process of claim 6, wherein a hierarchical structure judgment matrix is performed on the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership of each safety risk factor and the weight of each safety risk factor, and fuzzy comprehensive judgment is performed, specifically:
constructing a judgment matrix R of the third-level factors based on the membership degree of the third-level factors in the current shield excavation process of the target shield construction project 11 ，R 12 ，R 21 ，R 22 Wherein R is 11 A matrix constructed by membership degrees of two factors of the ratio of the diameter of the shield to the buried depth of the tunnel and the reciprocal of the distance of the tunnel from the building, R 12 Matrices constructed for membership of tunnel diameters, R 21 Is a matrix of membership degree construction of three factors of grouting pressure, tunnel face pressure and jack thrust, R 22 A matrix constructed for membership of coefficient of friction;
judging matrix R according to third level factor 11 ，R 12 ，R 21 ，R 22 And corresponding weight A 11 ，A 12 ，A 21 ，A 22 And calculating to obtain a fuzzy comprehensive judgment result B of the third-level factor 11 ＝A 11 R 11 ，B 12 ＝A 12 R 12 ，B 21 ＝A 21 R 21 ，B 22 ＝A 22 R 22 ；
Constructing a judgment matrix of the second level factor as R 1 ＝(B 11 ，B 12 ) T ，R 2 ＝(B 21 ，B 22 ) T ；
Judging matrix R according to second level factor 1 ，R 2 And corresponding weight A 1 ，A 2 And calculating to obtain a fuzzy comprehensive judgment result B of the second-level factors 1 ＝A 1 R 1 ，B 2 ＝A 2 R 2 ；
Constructing a judgment matrix of the first level factor as R ═ B 1 ，B 2 ) T ；
And calculating to obtain a fuzzy comprehensive evaluation result B of the first-level factor, namely AR, according to the evaluation matrix R of the first-level factor and the corresponding weight A.
8. The method for evaluating safety of surface subsidence during shield excavation according to claim 7, wherein the step S40 is to determine the safety risk level of surface subsidence during current shield excavation of the target shield construction project based on the fuzzy comprehensive evaluation result B of the first-level factor and according to the maximum membership rule.
9. A safety evaluation system for surface subsidence in the shield excavation process is characterized by comprising:
the construction unit is configured to construct a safety evaluation model of the earth surface in the shield excavation process based on construction data of historical tunnel shield construction projects, wherein the safety evaluation model of the earth surface comprises safety risk factors, safety risk levels and membership functions corresponding to the safety risk levels;
the weight determining unit is configured to construct a judgment matrix of each safety risk factor based on an analytic hierarchy process and determine the weight of each safety risk factor;
the evaluation unit is configured to construct an evaluation matrix for the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership function and the weight of each safety risk factor, and perform fuzzy comprehensive evaluation;
and the safety risk level determining unit is configured to determine the safety risk level of the surface subsidence in the shield excavation process of the target shield construction project based on the evaluation result of the fuzzy comprehensive evaluation and according to the maximum membership principle.
10. The system for evaluating safety of surface subsidence during shield excavation according to claim 9, wherein the evaluation unit comprises a calculation subunit and an evaluation subunit, wherein,
the calculation subunit is configured to calculate the membership degree of each safety risk factor monitored in the current shield excavation process of the target shield construction project based on the membership degree function;
the evaluation subunit is configured to perform hierarchical structure evaluation matrix on the safety risk factors monitored in the current shield excavation process of the target shield construction project based on the membership degree of each safety risk factor and the weight of each safety risk factor, and perform fuzzy comprehensive evaluation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115983644A (en) * | 2023-01-12 | 2023-04-18 | 北京建筑大学 | Underground engineering construction risk dynamic assessment method based on real-time monitoring data |
| CN116205473A (en) * | 2023-05-06 | 2023-06-02 | 绿城乐居建设管理集团有限公司 | Building construction scheduling scheme optimization method and storage medium |
| CN117474170A (en) * | 2023-11-17 | 2024-01-30 | 中电建铁路建设投资集团有限公司 | Shield settlement deformation model construction method based on neural network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115983644A (en) * | 2023-01-12 | 2023-04-18 | 北京建筑大学 | Underground engineering construction risk dynamic assessment method based on real-time monitoring data |
| CN116205473A (en) * | 2023-05-06 | 2023-06-02 | 绿城乐居建设管理集团有限公司 | Building construction scheduling scheme optimization method and storage medium |
| CN117474170A (en) * | 2023-11-17 | 2024-01-30 | 中电建铁路建设投资集团有限公司 | Shield settlement deformation model construction method based on neural network |
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