Shield tunnel sealing gasket waterproof performance analysis method and system

Abstract

The invention relates to a shield tunnel construction technology, and discloses a shield tunnel sealing gasket waterproof performance analysis method and system. The method comprises the following steps: constructing a two-dimensional plane strain model corresponding to a segment joint in a shield tunnel, constructing a model representation of a sealing gasket in the two-dimensional plane strain model, and inputting constitutive model parameters of the sealing gasket in the two-dimensional plane strain model; the sealing gasket is arranged in a sealing groove of a segment joint; preset working conditions of the sealing gasket are set, and contact stress distribution information borne by the sealing gasket under the preset working conditions is obtained; the preset working conditions comprise the preset opening amount, the preset slab staggering amount and the preset water pressure; calculating effective stress proportions of the sealing gasket on different contact surfaces according to the contact stress distribution information, and generating waterproof performance and an improvement strategy of the sealing gasket under a preset working condition according to the effective stress proportions. The waterproof performance of the sealing gasket under different working conditions can be accurately tested, and the construction safety of a shield tunnel is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunnel construction, and in particular to a method and system for analyzing the waterproof performance of a shield tunnel sealing pad. Background Art

[0002] During shield tunnel construction, waterproofing is a crucial component in ensuring the safety and durability of tunnel structures. Sealing gaskets, installed at the joints of shield tunnel segments, primarily prevent groundwater from seeping into the tunnel. However, existing methods for analyzing the waterproofing performance of sealing gaskets have numerous limitations, making it difficult to comprehensively and accurately assess their effectiveness under varying water pressures and installation errors, such as opening and misalignment.

[0003] Traditional methods for evaluating gasket waterproofing performance rely primarily on laboratory experiments, which typically measure gasket leakage by simulating varying water pressures and installation errors. However, experimental methods are time-consuming, costly, and limited by experimental equipment and conditions, making them incapable of fully simulating actual operating conditions. With the advancement of computer technology, numerical simulation methods have been increasingly applied to the analysis of gasket waterproofing performance, with finite element analysis (FEA) tools widely used to simulate the mechanical properties of gaskets under different operating conditions. However, existing numerical simulation methods typically only consider single factors, such as water pressure or opening, and fail to systematically analyze the combined effects of multiple operating conditions. They also have limitations in material constitutive models and contact simulation. Some studies have attempted to combine experimental methods with numerical simulation, obtaining key parameters experimentally and using numerical simulation for prediction and optimization. However, these approaches still face challenges such as the difficulty in obtaining experimental data and low simulation accuracy, and a systematic and comprehensive analysis approach has yet to be established.

[0004] The limitations of existing technologies are mainly reflected in the following aspects: the experimental methods require a large amount of equipment and human resources, and the experimental conditions are difficult to fully simulate the actual working conditions, resulting in limited applicability and generalizability of the experimental results; numerical simulation methods usually fail to fully consider the mechanical properties of the sealing gasket under different working conditions, especially the failure to systematically analyze the combined effects of opening amount, misalignment and water pressure, resulting in insufficient reliability and accuracy of the simulation results; existing methods are usually single-factor analysis or simple combination, lacking systematic and comprehensive analysis methods, making it difficult to comprehensively and accurately evaluate the waterproof performance of the sealing gasket under actual working conditions. Summary of the Invention

[0005] In order to solve the problem that it is difficult to accurately evaluate the waterproof performance of sealing gaskets under different industrial controls in the prior art, the present invention provides a method and system for analyzing the waterproof performance of shield tunnel sealing gaskets.

[0006] In a first aspect, the present invention provides a method for analyzing the waterproof performance of a shield tunnel sealing gasket, comprising: Constructing a two-dimensional plane strain model corresponding to a segment joint in a shield tunnel, constructing a model representation of a sealing gasket in the two-dimensional plane strain model, and inputting constitutive model parameters of the sealing gasket into the two-dimensional plane strain model; the sealing gasket is disposed in a sealing groove of the segment joint; Setting a preset working condition of the sealing gasket and obtaining contact stress distribution information of the sealing gasket under the preset working condition; the preset working condition includes a preset opening amount, a preset misalignment amount and a preset water pressure; The effective stress proportions of the sealing gasket on different contact surfaces are calculated based on the contact stress distribution information, and the waterproof performance and improvement strategy of the sealing gasket under the preset working conditions are generated based on the effective stress proportions.

[0007] In an optional embodiment, inputting the constitutive model parameters of the sealing gasket into the two-dimensional plane strain model includes: The strain energy function of the sealing gasket is constructed according to the material parameters of the sealing gasket: U=C 10 (I1-3)+C 01 (I2-3); A first relationship function between the initial shear modulus and the elastic modulus of the sealing gasket is constructed according to the material parameters: Determine the material type of the sealing gasket, and obtain the hardness of the sealing gasket according to the material type, as well as a second relationship function between the hardness and the elastic modulus: Calculating constitutive model parameters of the sealing gasket according to the hardness, the first relationship function, the second relationship function, and the variable energy function, wherein the constitutive model parameters include strain energy, initial shear modulus, and elastic modulus; Where U is strain energy, C 10 is the first material parameter of the gasket, C 01 is the second material parameter of the gasket, G g is the initial shear modulus, E g is the elastic modulus, is the second invariant.

[0008] In an optional embodiment, setting a preset working condition for the sealing gasket and obtaining contact stress distribution information on the sealing gasket under the preset working condition includes: Setting the working condition of the sealing gasket to a first preset working condition, wherein the first preset working condition includes a first preset opening amount, a first preset offset amount, and a first preset water pressure; Obtaining a first stress cloud diagram of the sealing gasket under the first preset working condition when the sealing gasket changes from an initial state before compression to an incompressible state; First contact stress distribution information of the sealing gasket under the first preset working condition is determined according to the first stress cloud map.

[0009] In an optional embodiment, the setting of a preset working condition for the sealing gasket and obtaining the contact stress to which the sealing gasket is subjected under the preset working condition further includes: Setting the working condition of the sealing gasket to a second preset working condition, wherein the second preset working condition includes the first preset opening amount, the first preset offset amount, and the second preset water pressure; Obtaining a second stress nephogram of the sealing gasket under the second working condition, from an initial state before compression to an incompressible state; Second contact stress distribution information of the sealing gasket under the second preset working condition is determined according to the second stress cloud map.

[0010] In an optional embodiment, the contact surface includes a first contact surface between the sealing gasket and the sealing gasket, and a second contact surface between the sealing gasket and the sealing groove, and calculating the effective stress proportion of the sealing gasket at different contact surfaces based on the contact stress distribution information includes: determining the effective contact stress of the sealing gasket according to the water pressure, and extracting the entire first contact stress from the first contact stress distribution information; Obtaining a first target contact stress greater than the effective contact stress from the first contact stress; determining an effective stress ratio of the first contact surface according to a ratio of the first contact stress to the first target contact stress on the first contact surface; An effective stress ratio of the second contact surface is determined according to a ratio of the first contact stress to the first target contact stress on the second contact surface.

[0011] In an optional embodiment, the method further comprises: Different preset working conditions are set according to the control variable method, and the corresponding waterproof performance and improvement strategy of the sealing gasket under the different preset working conditions are calculated.

[0012] In an optional embodiment, generating the waterproof performance and improvement strategy of the sealing gasket under the preset working conditions according to the effective stress ratio includes: determining distribution information of the effective stress on the sealing gasket according to the effective stress ratio; The deformation information of the sealing gasket is determined according to the distribution information, and the waterproof performance and improvement strategy of the sealing gasket are determined according to the deformation information.

[0013] In a second aspect, the present invention provides a shield tunnel sealing gasket waterproof performance analysis system, comprising: A construction module is used to construct a two-dimensional plane strain model corresponding to a segment joint in a shield tunnel, construct a model representation of a sealing gasket in the two-dimensional plane strain model, and input constitutive model parameters of the sealing gasket into the two-dimensional plane strain model; the sealing gasket is disposed in a sealing groove of the segment joint; an acquisition module, configured to set a preset working condition of the sealing gasket and acquire contact stress distribution information of the sealing gasket under the preset working condition; the preset working condition includes a preset opening amount, a preset misalignment amount, and a preset water pressure; A generation module is used to calculate the effective stress ratio of the sealing gasket on different contact surfaces according to the contact stress distribution information, and generate the waterproof performance and improvement strategy of the sealing gasket under the preset working conditions according to the effective stress ratio.

[0014] In a third aspect, the present invention provides a computer device comprising a processor and a memory, wherein the memory stores a computer program, and the processor is used to execute the computer program to implement the shield tunnel sealing pad waterproof performance analysis method described in any one of the aforementioned embodiments.

[0015] In a fourth aspect, the present invention provides a computer storage medium storing a computer program, which, when executed on a processor, implements the shield tunnel sealing gasket waterproof performance analysis method according to any one of the aforementioned embodiments.

[0016] The embodiments of the present invention have the following beneficial effects: The shield tunnel sealing gasket waterproof performance analysis method provided by the present invention constructs a two-dimensional plane strain model and inputs the constitutive model parameters and working conditions of the sealing gasket into the two-dimensional plane strain model, thereby simulating the contact stress distribution information of the sealing gasket under preset working conditions in the two-dimensional plane model. The waterproof performance and improvement strategy of the sealing gasket are determined based on the contact stress distribution information, which provides strong support for waterproof design and optimization in shield tunnel construction and can significantly improve the safety and durability of the tunnel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. It is possible for a person skilled in the art to derive other relevant drawings based on these drawings without inventive effort.

[0018] Figure 1 A schematic flow chart of a method for analyzing the waterproof performance of a shield tunnel sealing gasket provided in an embodiment of the present application is shown; Figure 2 A schematic diagram of a pipe segment joint model provided in an embodiment of the present application is shown; Figure 3 A schematic diagram of a sealing gasket provided in an embodiment of the present application is shown; Figure 4 A schematic cross-sectional view of a sealing gasket provided in an embodiment of the present application before compression is shown; Figure 5 A schematic cross-sectional view of the end of the compression elastic stage of a sealing gasket provided in an embodiment of the present application is shown; Figure 6 A schematic cross-sectional view of the end of the compression instability stage of a sealing gasket provided in an embodiment of the present application is shown; Figure 7 A schematic diagram of a fully closed cross section of a sealing gasket provided in an embodiment of the present application is shown; Figure 8 A schematic diagram of a stress cloud diagram of a sealing gasket provided in an embodiment of the present application when no water pressure is applied is shown; Figure 9 A schematic diagram of a stress cloud diagram of a sealing gasket when water pressure is applied is shown in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the figures is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by those skilled in the art based on the embodiments of the present invention without inventive effort are intended to be within the scope of protection of the present invention.

[0021] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present invention, are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0022] Furthermore, the terms “first,” “second,” “third,” etc., are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0023] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which the various embodiments of the present invention pertain. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meaning as in the context of the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning unless clearly defined in the various embodiments of the present invention.

[0024] In the absence of conflict, the following embodiments and features thereof may be combined with each other.

[0025] Reference Figure 1 , Figure 1 A schematic flow chart of a method for analyzing the waterproof performance of a shield tunnel sealing gasket provided in this embodiment includes: S101. Construct a two-dimensional plane strain model corresponding to a segment joint in a shield tunnel, construct a model representation of a sealing gasket in the two-dimensional plane strain model, and input constitutive model parameters of the sealing gasket into the two-dimensional plane strain model; the sealing gasket is set in a sealing groove of the segment joint.

[0026] Reference Figure 2 , Figure 2 A schematic diagram of a segment joint model provided in this embodiment.

[0027] The joints of the pipe segments are generally fixed with multiple nodes. There are gaps in the joints of the pipe segments. The sealing gaskets are used to block the gaps in the joints of the pipe segments, thereby playing a waterproof role.

[0028] See also Figure 3 , Figure 3 This is a schematic diagram of a sealing gasket provided in this embodiment.

[0029] In order to facilitate the setting of sealing gaskets and achieve waterproofing effect, corresponding sealing grooves are usually set in the joints of the pipe segments of the shield tunnel, and then the sealing gaskets are set in the corresponding sealing grooves to achieve waterproofing of the shield tunnel.

[0030] like Figure 3 As shown, the sealing groove can be divided into a left sealing groove and a right sealing groove, and the sealing gasket can also be divided into a corresponding left sealing gasket and a right sealing gasket. The left sealing gasket and the right sealing gasket will be connected when subjected to external force, thereby playing a waterproof role.

[0031] To analyze the waterproof performance of gaskets in practical applications, the segment joints of shield tunnels can be simplified into a two-dimensional plane strain model. Specifically, this model can be created using finite element software such as ABAQUS or ANSYS. The opening amount can then be controlled by controlling the displacement of the sealing groove in the X direction, and the misalignment amount can be controlled by controlling the displacement of the sealing groove in the Y direction.

[0032] Since the sealing groove is usually a concrete structure and the sealing gasket is usually a rubber structure, and considering that the stiffness of the concrete sealing groove is much greater than that of the rubber, in the numerical simulation method of the waterproof ability of the sealing gasket, the sealing groove is simulated as a rigid body to simplify the calculation, and the rubber sealing gasket is simulated using a plane strain unit. In the numerical simulation, the sealing gasket is generally regarded as a hyperelastic body with reversible deformation and incompressibility.

[0033] When it comes to choosing a rubber constitutive model, the Mooney-Rivlin model and the Yeoh model are widely used. EPDM rubber is typically considered an isotropic, incompressible, hyperelastic material. The nonlinear constitutive relationship between stress and strain in hyperelastic materials is primarily defined using a strain energy function, and the commonly used Mooney-Rivlin two-parameter model is used in calculations.

[0034] S102, setting preset working conditions for the sealing gasket, and obtaining contact stress distribution information of the sealing gasket under the preset working conditions; the preset working conditions include a preset opening amount, a preset misalignment amount, and a preset water pressure.

[0035] Preset operating conditions include preset opening, preset offset, and preset water pressure. Under different preset operating conditions, the waterproof performance of the gasket will also vary. This waterproof performance can be mainly reflected by contact stress. Contact stress refers to the localized stress generated in and around the contact area when two objects are in contact and subjected to external force.

[0036] S103 , calculating effective stress proportions of the sealing gasket at different contact surfaces according to the contact stress distribution information, and generating waterproof performance and improvement strategies of the sealing gasket under the preset working conditions according to the effective stress proportions.

[0037] Based on the contact stress, the force and displacement conditions of different contact surfaces of the gasket can be determined, thereby determining the sealing and waterproof properties of different contact surfaces of the gasket. Corresponding improvement strategies can also be generated based on the stress distribution to improve the waterproof performance of the gasket.

[0038] This embodiment constructs a two-dimensional plane strain model and inputs the constitutive model parameters and operating conditions of the sealing gasket into the two-dimensional plane strain model, thereby simulating the contact stress distribution information of the sealing gasket under preset operating conditions in the two-dimensional plane model. The waterproof performance and improvement strategy of the sealing gasket are determined based on the contact stress distribution information, which provides strong support for the waterproof design and optimization in shield tunnel construction and can significantly improve the safety and durability of the tunnel structure.

[0039] In one embodiment, inputting the constitutive model parameters of the sealing gasket into the two-dimensional plane strain model includes: According to the Mooney-Rivlin two-parameter model, the strain energy function of the sealing gasket is constructed: U=C 10 (I1-3)+C 01 (I2-3).

[0040] Fitting and linear regression were performed based on the rubber test data, assuming that the initial shear modulus (Gg) of the rubber gasket material is equal to twice the sum of the calculation model parameters, and the elastic modulus (Eg) of the rubber gasket material is equal to three times the initial shear modulus.

[0041] Then, a first relationship function between the initial shear modulus and the elastic modulus of the sealing gasket can be constructed according to the material parameters: Determine the material type of the sealing gasket, and obtain the hardness of the sealing gasket according to the material type, as well as a second relationship function between the hardness and the elastic modulus: According to the hardness, the first relationship function, the second relationship function and the variable energy function, the constitutive model parameters of the sealing gasket are calculated, and the constitutive model parameters include strain energy, initial shear modulus and elastic modulus; wherein U is strain energy, C is 10 is the first material parameter of the gasket, C 01 is the second material parameter of the gasket, G g is the initial shear modulus, E g is the elastic modulus, is the second invariant.

[0042] In the rubber sealing gasket in the study, the hardness of EPDM rubber is Shore A67. After confirming the hardness of the sealing gasket rubber, the constitutive parameters of the sealing gasket can be calculated. The specific values ​​are shown in Table 1.

[0043] Table 1

[0044] Wherein, D1 is the third material parameter.

[0045] This embodiment constructs the strain energy function of the sealing gasket through a two-parameter model, and then constructs a corresponding relationship function based on the initial shear modulus, elastic modulus and hardness of the sealing gasket. After determining the material type of the sealing gasket, the hardness information of the sealing gasket can be obtained, thereby calculating the various constitutive model parameters of the sealing gasket, thereby achieving accurate simulation of the sealing gasket in a two-dimensional plane strain model.

[0046] like Figure 3 As shown in the figure, the contact generated during the compression of shield gaskets can be categorized into two types: rigid-flexible contact and flexible-flexible contact. The shield segments are made of concrete, which is much more rigid than the gaskets nested in their grooves. Therefore, the contact between the segments and the gaskets is rigid-flexible contact. When the gaskets are compressed, contact occurs between the upper and lower gaskets, the outer contours of the gaskets themselves, and the closed holes. This type of contact is flexible-flexible contact. Surface-to-surface contact is used in ABAQUS to simulate these interactions.

[0047] Based on the characteristics of shield gaskets, ABAQUS software uses contact pairs to simulate the contact between segments and gaskets, and between gaskets. ABAQUS also simulates the contact between the compressed holes inside the gaskets and the compressed outer contours of the gaskets themselves by setting self-contact.

[0048] There are four types of contact between the pipe segment and the sealing gasket, namely left groove-left pad, left groove-right pad, right groove-left pad and right groove-right pad. Among them, the left groove-left pad and the right groove-right pad have been mentioned in previous literature, while the left groove-right pad and the right groove-left pad are less mentioned. Under normal compression conditions, contact is not likely to occur between the left groove-right pad and the right groove-left pad, but under adverse working conditions, such as when the pipe segment is misaligned, contact will occur between the left groove-right pad and the right groove-left pad.

[0049] When establishing a 2D plane strain model, the contact between the rubber gasket model and the segment joint sealing groove is relatively complex. Therefore, when selecting the slave surfaces for the segment-gasket contact pair, the principle is to use the component surface with the highest material stiffness as the master surface. The sealing groove surface is used as the master surface, and the outer contour surface of the gasket is used as the slave surface.

[0050] In one embodiment, setting a preset working condition for the sealing gasket and obtaining contact stress distribution information on the sealing gasket under the preset working condition includes: Setting the working condition of the sealing gasket to a first preset working condition, wherein the first preset working condition includes a first preset opening amount, a first preset offset amount, and a first preset water pressure; Obtaining a first stress cloud diagram of the sealing gasket under the first preset working condition when the sealing gasket changes from an initial state before compression to an incompressible state; First contact stress distribution information of the sealing gasket under the first preset working condition is determined according to the first stress cloud map.

[0051] When the sealing gasket is subjected to external force, it will gradually compress and deform, and its compression stage can be divided into four stages.

[0052] Figure 4 A schematic cross-sectional view of a sealing gasket before compression is shown.

[0053] Figure 5 A schematic cross-sectional view of the end of the compression elastic stage of a sealing gasket is shown.

[0054] Figure 6 A schematic cross-sectional view of the end of the compression instability stage of a sealing gasket is shown.

[0055] Figure 7 A schematic diagram of a fully closed cross section of a sealing gasket is shown.

[0056] in, Figures 4 to 5 During the process, the load value increases linearly with the compression deformation value of the sealing gasket, so this stage can be referred to as the "elastic stage". Figure 4 The cross section of the gasket before compression is shown. Figure 5 The elastic phase ends when the state is . Figure 5 It can be seen from the figure that at this stage the sealing gasket closing hole begins to deform under the action of pressure, and the closing compression force of the sealing gasket increases with the increase of compression amount.

[0057] from Figures 5 to 6 During the process, the closing compression force of the gasket does not increase with the increase of compression amount, but presents the characteristic that the compression amount increases but the closing compression force is basically stable. Figure 6 It can be seen from the figure that this is because the closed hole becomes unstable under the action of pressure, and the closed hole area decreases, but the closing compression force only needs to be maintained at the size of instability to maintain this state. Therefore, this stage can be simply referred to as the "instability stage".

[0058] from Figures 6 to 7During this stage, the load increases exponentially with the compression deformation of the gasket. Figure 7 shows a cross-section of the fully closed gasket. At the beginning of this stage, the closed pores continue to compress, and by the end, they are essentially closed. Simultaneously, the open pores begin to deform under the pressure. Since rubber has the characteristic of superelasticity—incompressibility—the closing compression force increases dramatically with increasing compression, so this stage can be called the "compression stage."

[0059] The waterproof performance of a gasket is generally affected by factors such as the opening amount, the offset amount and the water pressure. In order to determine the degree of influence of each factor, the control variable method can be used for testing.

[0060] For example, for the first preset working condition, the first preset opening amount can be set to 8 mm, the first preset offset amount can be set to 0 mm, and the first preset water pressure can be set to 0, and then the stress cloud map of the sealing gasket before compression and during complete closure can be obtained.

[0061] Under the second preset working condition, the second preset opening amount can be set to 8mm, the second preset offset amount can be set to 0mm, and the second preset water pressure can be set to 1MPa, and then the stress cloud map of the sealing gasket before compression and during complete closure can be obtained.

[0062] Figure 8 A schematic diagram of the stress cloud diagram of the sealing gasket when no water pressure is applied is shown.

[0063] Through stress cloud map analysis, it can be found that the maximum stress when no water pressure is applied is 3.781MPa, which is located at the tight pressure of the circular hole at the bottom of the outer sealing gasket.

[0064] Figure 9 A schematic diagram of the stress cloud diagram of the sealing gasket when water pressure is applied is shown.

[0065] Through stress cloud map analysis, it can be found that when a water pressure of 1 MPa is applied, the maximum stress is 6.732 MPa, located at the intersection of the lower right part of the outer sealing gasket and the pipe segment.

[0066] Observing the deformation morphology cloud diagrams of the gaskets under the two conditions reveals that: after considering the effect of water pressure, the gasket deforms significantly toward the water-repellent side, with the upper and lower gaskets squeezing each other more intensely. The squeezed right gasket, after compression, has already experienced a concave center, with a tendency to deform upward and downward. Under the action of water pressure, the entire gasket deforms downward, with the upper legs of the left and right gaskets completely disconnected from the sealing groove. The water-repellent side of the gasket is disconnected from the sealing groove, and the gasket legs are warped, with only the edges of the legs in contact with the sealing groove, resulting in contact stress concentration between the gasket and the sealing groove.

[0067] This embodiment determines the contact stress distribution information of the sealing gasket through the stress cloud diagram of the sealing gasket, providing data support for the subsequent analysis of the waterproof performance of the sealing gasket.

[0068] In one embodiment, the contact surface includes a first contact surface between the sealing gasket and the sealing gasket, and a second contact surface between the sealing gasket and the sealing groove, and calculating the effective stress proportion of the sealing gasket at different contact surfaces based on the contact stress distribution information includes: determining the effective contact stress of the sealing gasket according to the water pressure, and extracting the entire first contact stress from the first contact stress distribution information; Obtaining a first target contact stress greater than the effective contact stress from the first contact stress; determining an effective stress ratio of the first contact surface according to a ratio of the first contact stress to the first target contact stress on the first contact surface; An effective stress ratio of the second contact surface is determined according to a ratio of the first contact stress to the first target contact stress on the second contact surface.

[0069] Since the numerical simulation calculated the water pressure to be 1 MPa, the effective contact stress is defined as a contact stress greater than or equal to 1 MPa. After accounting for the water pressure, the average contact stress of the gasket increases, and the effective contact stress distribution becomes more concentrated. This is because the internal pores of the gasket gradually decrease under the action of water pressure, resulting in more intense compression at the corners of the upper and lower gaskets. This change in contact stress distribution results in contact stress exceeding 1 MPa at most points between the gaskets. For some points, the contact stress is far less than 1 MPa, confirming that the waterproofing requirements are not met.

[0070] The effective stress ratio of the sealing gasket contact surface can be obtained through the effective contact stress, as shown in Table 2:

[0071] It can be seen from Table 2 that the effective stress ratio of the first contact surface between the gaskets is higher than the effective stress ratio of the bottom of the gasket comb teeth. The bottom of the gasket comb teeth is the second contact surface. This is because under the action of water pressure, the torsional interaction on the contact surface between the gaskets can increase the effective stress ratio on the contact surface, thereby improving the waterproof performance of the gasket and generating a larger effective stress ratio.

[0072] This embodiment provides a data basis for subsequent analysis and improvement of the waterproof performance of the sealing gasket by calculating the effective stress ratio of different contact surfaces.

[0073] In one embodiment, generating the waterproof performance and improvement strategy of the sealing gasket under the preset working conditions according to the effective stress ratio includes: determining distribution information of the effective stress on the sealing gasket according to the effective stress ratio; The deformation information of the sealing gasket is determined according to the distribution information, and the waterproof performance and improvement strategy of the sealing gasket are determined according to the deformation information.

[0074] The stress cloud diagram shows that the effective stress distributions on the first and second contact surfaces differ. The effective stress distribution between the gaskets follows an upward-opening parabola, with higher stress at the corners and lower stress near the center of the contact surface. This is because the deformation at the ends is much greater than in the center. Meanwhile, the effective stress at the bottom of the gasket teeth is primarily concentrated at the two inner bottom portions. This is because the outer two bottom portions are so deformed that they can barely support the load, resulting in the effective stress being concentrated at the inner corners. Therefore, greater consideration should be given to water leakage between the gasket and the groove, and enhanced protection in this area should be implemented.

[0075] Therefore, the sealing gasket itself or the opening amount and misalignment amount can be adjusted and optimized accordingly according to the deformation of different contact surfaces, thereby improving the waterproof performance of the sealing gasket.

[0076] This embodiment determines the waterproof performance and improvement strategy of the sealing gasket through deformation information, which can improve the waterproof performance of the sealing gasket under different working conditions and improve the safety of the shield tunnel.

[0077] In one embodiment, the method further includes: setting different preset working conditions according to a control variable method, and calculating corresponding waterproof performance and improvement strategies of the sealing gasket under different preset working conditions.

[0078] Specifically, the opening amount can be set to 2mm, 4mm, 6mm, 8mm and other different situations, the offset amount can be set to 5mm, 10mm, 15mm, 20mm and other different situations, and the water pressure can also be set to different data. Then, it can be determined under different working conditions which sealing gasket to choose, or how to adjust other working parameters to achieve the optimal solution for the waterproof performance of the sealing gasket.

[0079] In one embodiment, the present invention further provides a shield tunnel sealing gasket waterproof performance analysis system, comprising: A construction module is used to construct a two-dimensional plane strain model corresponding to a segment joint in a shield tunnel, construct a model representation of a sealing gasket in the two-dimensional plane strain model, and input constitutive model parameters of the sealing gasket into the two-dimensional plane strain model; the sealing gasket is disposed in a sealing groove of the segment joint; an acquisition module, configured to set a preset working condition of the sealing gasket and acquire contact stress distribution information of the sealing gasket under the preset working condition; the preset working condition includes a preset opening amount, a preset misalignment amount, and a preset water pressure; A generation module is used to calculate the effective stress ratio of the sealing gasket on different contact surfaces according to the contact stress distribution information, and generate the waterproof performance and improvement strategy of the sealing gasket under the preset working conditions according to the effective stress ratio.

[0080] It can be understood that the shield tunnel sealing gasket waterproof performance analysis system of this embodiment corresponds to the shield tunnel sealing gasket waterproof performance analysis method of the above embodiment. The options in the above embodiment are also applicable to this embodiment, so they will not be repeated here.

[0081] The present invention also provides a computer device. Exemplarily, the computer device includes a processor and a memory, wherein the memory stores a computer program, and the processor runs the computer program to enable the computer device to execute the above-mentioned shield tunnel sealing pad waterproof performance analysis method or the functions of each module in the above-mentioned shield tunnel sealing pad waterproof performance analysis system.

[0082] The processor can be an integrated circuit chip with signal processing capabilities. The processor can be a general-purpose processor, including at least one of a central processing unit (CPU), a graphics processing unit (GPU), a network processor (NP), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor, and can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention.

[0083] The memory may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), and electrically erasable programmable read-only memory (EEPROM). The memory is used to store computer programs, and the processor can execute the computer programs accordingly after receiving an execution instruction.

[0084] The present invention also provides a computer storage medium for storing the computer program used in the aforementioned computer device. The computer storage medium may be a readable storage medium, a non-volatile storage medium, or a volatile storage medium. For example, the computer storage medium may include, but is not limited to, various media capable of storing program code, such as a USB flash drive, a removable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0085] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and structure diagrams in the accompanying drawings show the possible architectures, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, program segment or part of the code, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in alternative implementations, the functions marked in the boxes can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the structure diagram and / or flowchart, as well as the combination of boxes in the structure diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0086] In addition, the functional modules or units in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0087] If the functions are implemented as software modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product, stored in a storage medium, includes instructions for causing a computer device (such as a smartphone, personal computer, server, or network device) to execute all or part of the steps of the methods described in various embodiments of the present invention.

[0088] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A method for analyzing the waterproof performance of a shield tunnel sealing gasket, characterized in that: include: Constructing a two-dimensional plane strain model corresponding to a segment joint in a shield tunnel, constructing a model representation of a sealing gasket in the two-dimensional plane strain model, and inputting constitutive model parameters of the sealing gasket into the two-dimensional plane strain model; the sealing gasket is disposed in a sealing groove of the segment joint; Setting a preset working condition of the sealing gasket and obtaining contact stress distribution information of the sealing gasket under the preset working condition; the preset working condition includes a preset opening amount, a preset misalignment amount and a preset water pressure; The effective stress proportions of the sealing gasket on different contact surfaces are calculated based on the contact stress distribution information, and the waterproof performance and improvement strategy of the sealing gasket under the preset working conditions are generated based on the effective stress proportions.

2. The method for analyzing the waterproof performance of a shield tunnel sealing gasket according to claim 1, characterized in that: Inputting the constitutive model parameters of the sealing gasket into the two-dimensional plane strain model includes: The strain energy function of the sealing gasket is constructed according to the material parameters of the sealing gasket: U = C 10 ( I 1-3)+ C 01 ( I 2-3) A first relationship function between the initial shear modulus and the elastic modulus of the sealing gasket is constructed according to the material parameters: G g = 2( C 10 + C 01 ) E g =3 G g Determine the material type of the sealing gasket, and obtain the hardness of the sealing gasket according to the material type, as well as a second relationship function between the hardness and the elastic modulus: Calculating constitutive model parameters of the sealing gasket according to the hardness, the first relationship function, the second relationship function, and the variable energy function, wherein the constitutive model parameters include strain energy, initial shear modulus, and elastic modulus; Where U is strain energy, C 10 is the first material parameter of the gasket, C 01 is the second material parameter of the gasket, G g is the initial shear modulus, E g is the elastic modulus, is the hardness, I 1 is the first invariant, I 2 is the second invariant.

3. The method for analyzing the waterproof performance of a shield tunnel sealing gasket according to claim 1, characterized in that: The step of setting a preset working condition for the sealing gasket and obtaining contact stress distribution information on the sealing gasket under the preset working condition includes: Setting the working condition of the sealing gasket to a first preset working condition, wherein the first preset working condition includes a first preset opening amount, a first preset offset amount, and a first preset water pressure; Obtaining a first stress cloud diagram of the sealing gasket under the first preset working condition when the sealing gasket changes from an initial state before compression to an incompressible state; First contact stress distribution information of the sealing gasket under the first preset working condition is determined according to the first stress cloud map.

4. The method for analyzing the waterproof performance of a shield tunnel sealing gasket according to claim 3, characterized in that: The step of setting a preset working condition for the sealing gasket and obtaining the contact stress on the sealing gasket under the preset working condition further includes: Setting the working condition of the sealing gasket to a second preset working condition, wherein the second preset working condition includes the first preset opening amount, the first preset offset amount, and the second preset water pressure; Obtaining a second stress nephogram of the sealing gasket under the second preset working condition, from an initial state before compression to an incompressible state; Second contact stress distribution information of the sealing gasket under the second preset working condition is determined according to the second stress cloud map.

5. The method for analyzing the waterproof performance of a shield tunnel sealing gasket according to claim 3, characterized in that: The contact surface includes a first contact surface between the sealing gaskets and a second contact surface between the sealing gasket and the sealing groove, and calculating the effective stress proportion of the sealing gasket at different contact surfaces according to the contact stress distribution information includes: determining the effective contact stress of the sealing gasket according to the water pressure, and extracting the entire first contact stress from the first contact stress distribution information; Obtaining a first target contact stress greater than the effective contact stress from the first contact stress; determining an effective stress ratio of the first contact surface according to a ratio of the first contact stress to the first target contact stress on the first contact surface; An effective stress ratio of the second contact surface is determined according to a ratio of the first contact stress to the first target contact stress on the second contact surface.

6. The method for analyzing the waterproof performance of a shield tunnel sealing gasket according to claim 5, characterized in that: The method further comprises: Different preset working conditions are set according to the control variable method, and the corresponding waterproof performance and improvement strategy of the sealing gasket under the different preset working conditions are calculated.

7. The method for analyzing the waterproof performance of a shield tunnel sealing gasket according to claim 1, characterized in that: The generating of the waterproof performance and improvement strategy of the sealing gasket under the preset working conditions according to the effective stress ratio includes: determining distribution information of the effective stress on the sealing gasket according to the effective stress ratio; The deformation information of the sealing gasket is determined according to the distribution information, and the waterproof performance and improvement strategy of the sealing gasket are determined according to the deformation information.

8. A shield tunnel sealing gasket waterproof performance analysis system, characterized in that: include: A construction module is used to construct a two-dimensional plane strain model corresponding to a segment joint in a shield tunnel, construct a model representation of a sealing gasket in the two-dimensional plane strain model, and input constitutive model parameters of the sealing gasket into the two-dimensional plane strain model; the sealing gasket is disposed in a sealing groove of the segment joint; an acquisition module, configured to set a preset working condition of the sealing gasket and acquire contact stress distribution information of the sealing gasket under the preset working condition; The preset working conditions include a preset opening amount, a preset misalignment amount and a preset water pressure; A generation module is used to calculate the effective stress ratio of the sealing gasket on different contact surfaces according to the contact stress distribution information, and generate the waterproof performance and improvement strategy of the sealing gasket under the preset working conditions according to the effective stress ratio.

9. A computer device, characterized in that: The computer device includes a processor and a memory, the memory stores a computer program, and the processor is used to execute the computer program to implement the shield tunnel sealing gasket waterproof performance analysis method according to any one of claims 1 to 7.

10. A computer storage medium, characterized in that It stores a computer program, which, when executed on a processor, implements the shield tunnel sealing gasket waterproof performance analysis method according to any one of claims 1 to 7.

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