Design method, system and terminal for waterproof elastic sealing pads for shield tunnel joints

Abstract

The present invention discloses a method for designing waterproof elastic sealing gaskets for shield tunnel joints, comprising: establishing a finite element model based on the shield segment groove shape of the target project, the outer contour of the waterproof elastic sealing gasket, and the holes of the elastic sealing gasket described by the initial design scheme using a B-spline curve; performing simulation of the elastic sealing gasket design in the finite element model based on the initial design scheme; iteratively optimizing the results of the simulation using an explicit topology optimization method to obtain an explicit expression of the final hole B-spline curve, and determining the elastic sealing gasket cross-section that meets the design requirements. At the same time, the present invention also provides a corresponding shield tunnel joint waterproof elastic sealing gasket design system, terminal, and medium. The present invention can obtain an elastic sealing gasket cross-section that meets the design requirements through topology optimization when the shield segment groove is determined, thereby overcoming the technical problems of low efficiency and poor economy in the prior art.

Description

Technical Field

[0001] The present invention relates to a waterproof elastic sealing pad in the technical field of shield tunnel joint waterproofing, and in particular to a design method, system and terminal of a shield tunnel joint waterproof elastic sealing pad. Background Art

[0002] Shield tunnels are assembled from segments, which contain numerous longitudinal and circumferential joints. These joints are often weak links in the tunnel's waterproofing system, making reliable joint waterproofing crucial for the proper operation of shield tunnels. Currently, domestic shield tunnel joints primarily utilize EPDM rubber (ethylene propylene diene monomer) for waterproofing, playing a key role in achieving this goal. This water-stopping effect is achieved by improving the cross-sectional shape of the sealing gasket and creating holes within it to control the contact surface stress.

[0003] Currently, the design method for elastic gasket sections in shield tunnel joints is primarily based on trial and error. This method relies on empirical experience to design multiple gasket sections, and then selects the optimal gasket section through numerical analysis or testing. This method is inefficient and uneconomical, and it often fails to achieve the most appropriate cross-sectional form.

[0004] After searching, Chinese patent application CN202110673139.2 discloses a shield tunnel segment joint sealing gasket cross-section optimization method and system. By establishing a 2.5D cross-section model and finite element model of the sealing gasket and groove, a load is applied to the sealing gasket finite element model to complete the compression simulation, and the contact stress distribution on the sealing gasket surface is extracted. The conical plane contact model and the Roth model are used to establish a microscopic sealing gasket surface leakage model. Based on the leakage model, the leakage rate formula is derived and the leakage rate is calculated. The sealing gasket cross-section is optimized using the leakage rate and contact stress as indicators to obtain the optimized interface model. However, this method is still a trial-and-error method, and has the shortcomings of low efficiency and poor economy of traditional sealing gasket design methods. Summary of the Invention

[0005] To address the shortcomings of the prior art, the present invention provides a design method, system, and terminal for waterproof elastic sealing gaskets for shield tunnel joints. This system optimizes elastic sealing gaskets with a defined outer contour and generates an optimized design for the gasket, maximizing its waterproofing capability and meeting design requirements.

[0006] According to one aspect of the present invention, a method for designing a waterproof elastic sealing gasket for a shield tunnel joint is provided, comprising:

[0007] A finite element model was established based on the target project's shield segment groove shape, the outer contour of the waterproof elastic sealing gasket, and the holes in the elastic sealing gasket's initial design described by a B-spline curve.

[0008] Based on the above initial design scheme, a simulation of the elastic sealing gasket design is performed in the finite element model;

[0009] Iteratively optimizing the simulation results using an explicit topology optimization method to obtain an explicit expression of the final hole B-spline curve and determine the elastic sealing gasket section that meets the design requirements;

[0010] in:

[0011] The simulation of the elastic sealing gasket design is performed in the finite element model, including:

[0012] - Applying external load to simulate the construction and assembly process of the elastic sealing gasket;

[0013] - Structural optimization considering nonlinear boundary conditions of contact, used to simulate the contact between the elastic sealing gasket and the groove, and between the sealing gaskets;

[0014] - Considering the holes of the elastic sealing gasket as self-contact, the mechanical characteristics of the holes in the sealing gasket during the compression process are simulated;

[0015] - Considering the nonlinearity of elastic gasket materials, it is used to simulate the physical and mechanical properties of elastic gaskets;

[0016] -The geometric nonlinearity of elastic gasket deformation is considered to simulate the large deformation characteristics of the gasket during compression.

[0017] Optionally, the finite element model is established, wherein: the outer contour shape of the elastic sealing gasket is determined, a topology optimization design area is created, meshing is performed, and a finite element mesh model is established.

[0018] Optionally, applying an external load to simulate the construction and assembly process of the elastic sealing gasket includes:

[0019] Creating a segment groove in the finite element model to simulate the confinement effect of the segment sealing groove on the elastic sealing gasket;

[0020] The tube segment groove is arranged in contact with the elastic sealing gasket. When the tube segment groove is in contact with the elastic sealing gasket, contact pressure is applied to the elastic sealing gasket through the contact surface.

[0021] Optionally, the structural optimization considering contact nonlinear boundary conditions includes:

[0022] The boundary conditions of the finite element model are set, all degrees of freedom constraints are applied to the lower surface of the segment groove, and vertical displacement boundary conditions are applied to the upper cover plate surface of the elastic sealing gasket.

[0023] Optionally, the structural optimization considering contact nonlinear boundary conditions includes:

[0024] An objective function is set, where the objective function is a function of contact stress, which is the minimum median contact stress of multiple contact surfaces, or the minimum value of the average contact stress of multiple contact surfaces.

[0025] According to a second aspect of the present invention, a design system for a waterproof elastic sealing gasket for a shield tunnel joint is provided, comprising:

[0026] Finite element model building module: This module builds a finite element model based on the target project's shield segment groove shape, the outer contour of the waterproof elastic sealing gasket, and the holes in the elastic sealing gasket's initial design described by a B-spline curve.

[0027] Simulation module: Based on the above initial design scheme, simulation of elastic sealing gasket design is performed in the finite element model;

[0028] Optimization design module: using explicit topology optimization method to iteratively optimize the simulation results, obtain explicit expression of hole B-spline curve, and determine the elastic sealing gasket section that meets the design requirements;

[0029] Wherein, the simulation module includes:

[0030] Construction and assembly simulation submodule: used to apply external loads and simulate the construction and assembly process of the elastic sealing gasket;

[0031] Contact simulation submodule: structural optimization considering nonlinear boundary conditions of contact, used to simulate the contact between the elastic sealing gasket and the groove, and between the sealing gaskets;

[0032] Compression process simulation submodule: Considering the holes of the elastic sealing gasket as self-contact, the mechanical characteristics of the holes in the sealing gasket during the compression process are simulated;

[0033] Physical and mechanical properties simulation submodule: Considering the nonlinearity of the elastic sealing gasket material, it is used to simulate the physical and mechanical properties of the elastic sealing gasket;

[0034] Gasket deformation simulation submodule: Considers the geometric nonlinearity of elastic gasket deformation and is used to simulate the large deformation characteristics of the gasket during compression.

[0035] According to a third aspect of the present invention, there is provided an electronic terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor is used to execute the above-mentioned method for designing waterproof elastic sealing pads for shield tunnel joints, or to run the above-mentioned design system for waterproof elastic sealing pads for shield tunnel joints when executing the program.

[0036] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the program is executed by a processor, it is used to execute the above-mentioned design method of the shield tunnel joint waterproof elastic sealing pad, or to run the above-mentioned design system of the shield tunnel joint waterproof elastic sealing pad.

[0037] Compared with the prior art, the embodiments of the present invention have at least one of the following beneficial effects:

[0038] The design method, system and terminal for waterproof elastic sealing gaskets for shield tunnel joints provided by the present invention can achieve the elastic sealing gasket cross-section that meets the design requirements through topological optimization when the shield segment groove is determined. It can be directly used in the CAD / CAE system, overcoming the technical problems of low efficiency and poor economy in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0040] Figure 1 This is a flow chart of a design method for a waterproof elastic sealing pad for a shield tunnel joint in one embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of contact nonlinearity in one embodiment of the present invention;

[0042] Figure 3 A schematic diagram of a contact surface in an embodiment of the present invention;

[0043] Figure 4 This is an overall schematic diagram of a shield segment groove design scheme in one embodiment of the present invention;

[0044] Figure 5 A schematic diagram of the outer contour of a sealing gasket in one embodiment of the present invention;

[0045] Figure 6 Schematic diagram of an optimization area of ​​a design method according to an embodiment of the present invention;

[0046] Figure 7 Schematic diagram of the relationship between the elastic sealing gasket and the shield segment groove in one embodiment of the present invention;

[0047] Figure 8 Schematic diagram of the sealing gasket solution finally obtained by optimization in one embodiment of the present invention. DETAILED DESCRIPTION

[0048] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several variations and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0049] Current design methods for elastic sealing gaskets in shield tunnel joints mostly rely on trial-and-error methods, relying primarily on empirical experience to design multiple gasket sections. The optimal gasket section is then selected through numerical analysis or testing. This method is inefficient and uneconomical, and it often struggles to achieve the most optimal cross-sectional form. Furthermore, achieving maximum waterproofing performance is difficult in shield tunnel joint waterproofing gasket design.

[0050] In order to solve the above-mentioned problems, the present invention provides a shield tunnel joint waterproof sealing gasket design method, which can optimize the elastic sealing gasket with a certain outer contour according to the groove shape of the shield tube segment of the target project, under the condition that the external load (assembly force) does not exceed the limit value, and generate an optimized elastic sealing gasket design scheme, so that the sealing gasket can achieve the maximum waterproof capability and meet the design requirements.

[0051] Reference Figure 1 FIG. 1 is a flow chart of a design method for a waterproof elastic sealing pad for a shield tunnel joint according to an embodiment of the present invention. Specifically, the design method in this embodiment includes the following steps:

[0052] S100: Establish a finite element model based on the target project's shield segment groove shape, waterproof elastic sealing gasket outer contour, and the elastic sealing gasket initial design holes described by B-spline curves;

[0053] In this step, the outer contour of the elastic gasket is determined based on the target project's segment joint groove shape. A topology optimization design region enclosed by the gasket's outer contour is created, meshed, and a finite element mesh model is constructed. This optimized design region is the area to be optimized in subsequent simulations.

[0054] B-spline curves were used to describe the holes in the initial design of the elastic sealing gasket;

[0055]

[0056] Where P i =(x i ,y i ) T (i=0, ..., n) is the coordinate of the control point of the closed B-spline curve, and n is the number of control points. i,k(u)is the k-order B-spline curve basis function of the corresponding i-th control point, which is composed of a monotone non-decreasing real number sequence U={u0,u1,…,u m The shape curve of the hole is determined by the coordinates of the control points on the hole.

[0057] S200, based on the initial design scheme, performing a simulation of elastic sealing gasket design in the finite element model;

[0058] In this step, simulation of the elastic sealing gasket design is performed in the finite element model, specifically considering the following aspects:

[0059] (1) Consider applying a new external load: The external load can apply contact pressure through boundary displacement, which can simulate the construction and assembly process of the elastic sealing gasket;

[0060] (2) Considering new boundary conditions: Solving the structural optimization that needs to consider contact nonlinear boundary conditions can be used to simulate the contact between gaskets, between gaskets and grooves, and between gaskets. This is an indispensable technology for gasket topology optimization design;

[0061] (3) Considering the self-contact of the holes: The self-contact of the holes in the gasket can be considered, which can more accurately reflect the mechanical characteristics of the holes in the gasket during the compression process;

[0062] (4) Considering the nonlinearity of the elastic sealing gasket material, it is used to simulate the physical and mechanical properties of the elastic sealing gasket;

[0063] (5) The geometric nonlinearity of the elastic gasket deformation is considered to simulate the large deformation characteristics of the gasket during compression.

[0064] The above simulation can provide a basis for optimized design.

[0065] S300: Using an explicit topology optimization method, iterative optimization is performed on the simulation results to obtain a final explicit B-spline curve representation of the hole, and a cross-section of the elastic sealing gasket that meets the design requirements is determined. Generally speaking, meeting the design requirements means that the upper surface reaction force of the elastic sealing gasket is no greater than the shield machine assembly force and no greater than the assembly force that causes damage to the shield segment groove; the objective function value is greater than the waterproof capability required by the sealing gasket design; and the hole size meets the production process requirements.

[0066] Through the above steps, this embodiment can transform the shield elastic sealing gasket optimization design problem into an explicit topology optimization problem, so that when the shield segment groove is determined, the elastic sealing gasket cross-section that meets the design requirements can be obtained through topology optimization.

[0067] In some possible embodiments, in the above S200, the structural optimization considering the contact nonlinear boundary conditions may include: setting the boundary conditions of the finite element model, applying all degree of freedom constraints on the lower surface of the segment groove, and applying vertical displacement boundary conditions on the upper cover plate surface of the elastic sealing gasket. Specifically, this embodiment can optimize the contact problem between the segment groove and a large hyperelastic deformation body through the above design, which is different from the existing optimization problem of a single structure under a simple load, so that the design results are more in line with practical applications. For example, refer to Figure 2 The contact nonlinearity in one embodiment is shown, where S1 and S2 are contact surfaces, and SC1 to SC9 are nine self-contact areas.

[0068] In this embodiment, contact pressure is applied by forced displacement. Specifically, this operation is to apply displacement on the segment groove, and the segment groove is in contact with the sealing gasket. When the segment groove is in contact with the sealing gasket, contact pressure is applied to the sealing gasket through the contact surface, which is quite different from the direct application of load in conventional topology optimization.

[0069] In some possible embodiments, in the above S200, the structural optimization considering contact nonlinear boundary conditions further includes: setting an objective function, wherein the objective function is a function of contact stress, which is the minimum median contact stress of multiple contact surfaces, or the minimum value of the average contact stress of multiple contact surfaces. Figure 2 、 3 As shown, the objective function Max(Mi n(P c1 ,P c2 ,…P cn ))P c1 ,P c2 ,…P cn are the median contact stress or average contact stress of the nth contact surface, respectively. The contact surfaces in the figure are S1 and S2.

[0070] In some possible embodiments, in S200, the simulation of the elastic gasket design in the finite element model further includes setting constraints, wherein the upper surface reaction force of the elastic gasket is no greater than the shield machine assembly force and no greater than the assembly force that would cause damage to the shield segment groove. The hole size meets production process requirements. This constraint can more accurately ensure that the designed gasket meets actual application requirements.

[0071] In some possible embodiments, in the above S200, the simulation of the elastic sealing gasket design is performed in the finite element model, which also includes: setting material parameters, the elastic sealing gasket material can adopt the Mooney-Rivlin model or the Yeoh model, and setting the normal and tangential contact characteristics of the contact surface in the finite element model. This part can perform different simulations according to different materials, and thus can provide design simulation results that adapt to different materials. Of course, in other embodiments, other elastic sealing gasket material models can also be used, and are not limited to the above-mentioned Mooney-Rivlin model or Yeoh model.

[0072] The above preferred features can be used in any combination without conflicting with each other. The above embodiment of the present invention can achieve the maximum waterproof capability of the sealing gasket by combining finite element method with explicit topology optimization.

[0073] Based on the same technical concept, in another embodiment of the present invention, a design system for waterproof elastic sealing gaskets for shield tunnel joints is provided, including: a finite element model establishment module, a simulation module and an optimization design module. The finite element model establishment module establishes a finite element model according to the shield segment groove shape of the target project, the outer contour of the waterproof elastic sealing gasket and the initial design scheme holes of the elastic sealing gasket described by the B-spline curve; the simulation module performs simulation of the elastic sealing gasket design in the finite element model based on the above initial design scheme; the optimization design module uses an explicit topology optimization method to iteratively optimize the simulation results, obtain an explicit expression of the hole B-spline curve, and determine the elastic sealing gasket section that meets the design requirements.

[0074] The above simulation module includes: a construction and assembly simulation submodule, a contact simulation submodule, a compression process simulation submodule, a physical and mechanical properties simulation submodule, and a sealing gasket deformation simulation submodule, wherein:

[0075] Construction and assembly simulation submodule: used to apply external loads and simulate the construction and assembly process of elastic sealing gaskets;

[0076] Contact simulation submodule: Structural optimization considering nonlinear boundary conditions of contact, used to simulate the contact between elastic gaskets and grooves, and between gaskets;

[0077] Compression process simulation submodule: Considering the holes of the elastic sealing gasket as self-contact, the mechanical characteristics of the holes in the sealing gasket during the compression process are simulated;

[0078] Physical and mechanical properties simulation submodule: Considering the nonlinearity of the elastic sealing gasket material, it is used to simulate the physical and mechanical properties of the elastic sealing gasket;

[0079] Gasket deformation simulation submodule: Considers the geometric nonlinearity of elastic gasket deformation and is used to simulate the large deformation characteristics of the gasket during compression.

[0080] The modules of the design system of the shield tunnel joint waterproof elastic sealing pad of the present invention correspond to the steps of the design method of the shield tunnel joint waterproof elastic sealing pad. The specific implementation technology can be referred to and will not be repeated here.

[0081] The above-described embodiments of the present invention utilize a finite element model and explicit topology optimization to optimize the design of waterproof elastic gaskets for shield tunnel joints, achieving maximum waterproofing capabilities and meeting design requirements. Specifically, the explicit topology optimization method uses B-spline curves to describe the holes in the initial design of the elastic gasket. A finite element calculation model is established based on the shield segment groove shape and the outer contour of the waterproof gasket. A general finite element simulation platform is used as the simulation solver, an explicit analysis module is selected, and geometric nonlinear analysis is configured. Through topology optimization design, an explicit B-spline curve representation of the hole is obtained, thereby determining the elastic gasket cross-section that meets the design requirements.

[0082] Topology optimization is a method of designing material distribution within a given design domain based on loads and constraints in order to optimize certain performance indicators. Most topology optimization studies are conducted under the implicit topology optimization framework, with a large number of design variables, and the obtained optimized design results usually require post-processing before they can be imported into the CAD / CAE system. The present invention adopts an explicit topology optimization method, which uses holes that can be explicitly described as the primitives of the structure, and obtains the optimal topology of the structure through its movement, deformation, intersection and overlap. In this explicit method, the structural topology description and the finite element analysis grid are independent of each other, so the convergence problem of the finite element analysis during the optimization iteration process can be directly and effectively alleviated by deleting the degrees of freedom of the finite element nodes in the holes. This method can greatly reduce the number of design variables, has a natural advantage in considering geometric features and structural optimization design problems that are sensitive to boundary responses, and the optimized design results can be seamlessly connected with the CAD / CAE system.

[0083] In order to better understand the solution of the present invention, a detailed schematic description is given below in conjunction with a preferred specific application example, but it should be understood that the present invention is not limited to the following specific application example.

[0084] Specifically, the shield tunnel joint waterproof elastic sealing pads required for this embodiment and the shield segment groove design scheme are as follows: Figure 4 As shown, the final design requirement meets the waterproof capability of 0.72MPa.

[0085] According to the above design requirements, the design method of the shield tunnel joint waterproof elastic sealing gasket of this embodiment includes the following steps:

[0086] Step 1: Based on the shield segment groove design, determine the outer contour shape of the elastic sealing gasket and the initial design holes of the elastic sealing gasket described by B-spline curves, create a topology optimization design area, perform mesh division, and establish a finite element mesh model;

[0087] like Figure 5 The outer contour shape of the sealing gasket is shown, wherein the area surrounded by the outer contour shape of the sealing gasket is the area that needs to be designed and optimized in this embodiment.

[0088] B-spline curves were used to describe the holes in the initial design of the elastic sealing gasket;

[0089]

[0090] Where P i =(x i ,y i ) T (i=0, ..., n) is the coordinate of the control point of the closed B-spline curve, and n is the number of control points. i,k(u) is the k-order B-spline curve basis function of the corresponding i-th control point, which is composed of a monotone non-decreasing real number sequence U={u0,u1,…,u m}(m=n+k+1) is generated.

[0091] The holes in the initial design can be given based on the design experience of existing projects. For example, Figure 6 As shown, a sealing gasket solution for initial structural holes.

[0092] Step 2: Create a segment groove in the finite element model to simulate the side confinement effect of the segment sealing groove on the waterproof sealing gasket;

[0093] Reference Figure 7 As shown, a schematic diagram of the relationship between the elastic sealing gasket and the shield segment groove is shown.

[0094] Step 3: Set the boundary conditions of the finite element model, apply all degree of freedom constraints on the lower surface of the segment groove, and apply vertical displacement boundary conditions on the upper cover surface of the gasket;

[0095] Step 4: Set the material parameters. The elastic sealing gasket material adopts the Mooney-Rivlin model. Set the normal contact in the finite element model to hard contact and set the tangential friction coefficient of the contact surface.

[0096] For example, waterproof sealing gaskets are made of EPDM rubber, which is a hyperelastic material. The Mooney-Rivlin model is a type of hyperelastic model with few parameters that are easy to obtain and is widely used.

[0097] Step 5: Set the surfaces where the gasket and the shield segment groove may contact each other to contact, set the gasket holes to self-contact, and set the mechanical parameters of the contact surface;

[0098] In this embodiment, the self-contact nonlinearity of the optimization area is considered. Figure 2 As shown, Figure 2 SC1 to SC9 are nine self-contact areas set.

[0099] Step 6: Set constraints: the reaction force on the upper surface of the gasket is no greater than the shield machine assembly force, and no greater than the assembly force that causes damage to the shield segment groove, and the hole size meets the production process requirements;

[0100] Step 7: Set the objective function, maximizing contact stress P. P is the smaller of the median or average contact stress P1 between the gasket and the shield segment groove and the median or average contact stress P2 on the gasket's upper surface. Based on previous research and engineering experience, the greater the contact stress, the stronger the gasket's waterproofing ability.

[0101] Step 8: Perform optimization design in a general numerical simulation platform, select the explicit analysis module, turn on the large deformation option, and set up geometric nonlinear analysis;

[0102] In this step, the general numerical simulation platform can use general finite element software for calculation, such as ABAQUS, ANSYS, MARC and other platforms, and of course other general numerical simulation platforms can also be used.

[0103] In this embodiment, the optimization design is performed using steps 1-7 to obtain the coordinates of the control points on the shape curve of the hole, that is, Pi=(x i ,y i ) T The control point coordinates of the closed B-spline curve. Once the control point coordinates are determined, the position, size and shape of the hole are determined.

[0104] In this step, the explicit analysis module can also be used in general finite element software. Geometric nonlinear analysis can be selected in general finite element software. Because the gasket undergoes large deformation during compression, considering geometric nonlinearity can reflect the actual stress characteristics.

[0105] In this embodiment, it is possible to avoid relying on experience in the design of elastic sealing gaskets, thereby solving the technical problems of low efficiency and poor economy in conventional sealing gasket designs.

[0106] Step 9: Based on the optimization design results, obtain the explicit expression of the hole B-spline curve and directly import the result into the CAD system to perform elastic sealing gasket cross-section design.

[0107] In this step, the optimization design results obtained after explicit analysis and nonlinear analysis in step 8, including P i =(x i ,y i ) T Control point coordinates of closed B-spline curve, contact surface stress and deformation values. Control point P i After obtaining the coordinates, the explicit expression of the hole B-spline curve can be obtained.

[0108] Reference Figure 8 As shown in FIG. , this is the sealing gasket solution finally optimized in this embodiment.

[0109] In this example, explicit topology optimization (steps 1 and 8) was employed to achieve efficient convergence of topology optimization, resolving the technical challenges of traditional implicit topology optimization, such as the difficulty in convergence and low solution efficiency. The use of explicit descriptions of deformable holes allowed for seamless integration of optimization results with CAD systems, resolving the technical challenges of utilizing topology optimization results. In this example, a deformable hole is defined as one whose shape, size, and position change as the coordinates of its control points change.

[0110] In this example, the finite element technology that takes boundary nonlinearity into consideration is used to simulate the real stress state of the elastic sealing gasket, solving the technical problems that the existing optimization technology cannot truly simulate the stress state of the elastic sealing gasket, and the problem that the boundary nonlinearity of the structure is not considered, and the real stress state of the sealing gasket cannot be considered when performing elastic sealing gasket optimization analysis, and the real optimization results cannot be obtained.

[0111] In summary, this application example can achieve the elastic sealing gasket cross-section that meets the design requirements through topology optimization when the shield segment groove is determined, overcoming the technical problems of low efficiency and poor economy in the existing technology.

[0112] Based on the same technical concept, in another embodiment of the present invention, an electronic terminal is provided, comprising a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the program, it is used to execute the design method of the shield tunnel joint waterproof elastic sealing pad in any of the above embodiments, or to run the design system of the shield tunnel joint waterproof elastic sealing pad in the above embodiments.

[0113] Based on the same technical concept, in another embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the program is executed by a processor, it is used to execute the design method of the shield tunnel joint waterproof elastic sealing pad in any of the above embodiments, or to run the design system of the shield tunnel joint waterproof elastic sealing pad in the above embodiments.

[0114] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0115] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0116] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0117] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0118] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0119] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A design method for a waterproof elastic sealing gasket for a shield tunnel joint, characterized in that: include: A finite element model was established based on the target project's shield segment groove shape, the outer contour of the waterproof elastic sealing gasket, and the holes in the elastic sealing gasket's initial design described by a B-spline curve. Based on the above initial design scheme, a simulation of the elastic sealing gasket design is performed in the finite element model; Iteratively optimizing the simulation results using an explicit topology optimization method to obtain an explicit expression of the final hole B-spline curve and determine the elastic sealing gasket section that meets the design requirements; in: The simulation of the elastic sealing gasket design is performed in the finite element model, including: - Applying external load to simulate the construction and assembly process of the elastic sealing gasket; - Structural optimization considering nonlinear boundary conditions of contact, used to simulate the contact between the elastic gasket and the groove, and between the gaskets; - Considering the holes of the elastic gasket as self-contact, the mechanical characteristics of the gasket holes during the compression process are simulated; - Considering the nonlinearity of elastic gasket materials, it is used to simulate the physical and mechanical properties of elastic gaskets; - Considering the geometric nonlinearity of elastic gasket deformation, it is used to simulate the large deformation characteristics of the gasket during compression.

2. The design method of the shield tunnel joint waterproof elastic sealing pad according to claim 1 is characterized in that: The finite element model is established, wherein: the outer contour shape of the elastic sealing gasket is determined, a topology optimization design area is created, the holes of the initial design scheme of the elastic sealing gasket are described by B-spline curves, meshing is performed, and a finite element mesh model is established.

3. The design method of the shield tunnel joint waterproof elastic sealing pad according to claim 1 is characterized in that: The applying of the external load to simulate the construction and assembly process of the elastic sealing gasket includes: Creating a segment groove in the finite element model to simulate the confinement effect of the segment sealing groove on the elastic sealing gasket; The tube segment groove is arranged in contact with the elastic sealing gasket. When the tube segment groove is in contact with the elastic sealing gasket, contact pressure is applied to the elastic sealing gasket through the contact surface.

4. The design method of the shield tunnel joint waterproof elastic sealing gasket according to claim 3 is characterized in that: The structural optimization considering contact nonlinear boundary conditions includes: The boundary conditions of the finite element model are set, all degrees of freedom constraints are applied to the lower surface of the segment groove, and vertical displacement boundary conditions are applied to the upper cover plate surface of the elastic sealing gasket.

5. The design method of shield tunnel joint waterproof elastic sealing pad according to claim 4 is characterized in that: The structural optimization considering contact nonlinear boundary conditions includes: An objective function is set, where the objective function is a function of contact stress, where the contact stress is the minimum median contact stress of multiple contact surfaces, or the minimum value of the average contact stress of multiple contact surfaces.

6. The design method of shield tunnel joint waterproof elastic sealing pad according to claim 4 is characterized in that: The simulation of the elastic sealing gasket design is performed in the finite element model, further comprising: Material parameters are set. The elastic sealing gasket material adopts the rubber hyperelastic Mooney-Rivlin model or the Yeoh model. The normal and tangential contact characteristics of the contact surface in the finite element model are set.

7. The design method of shield tunnel joint waterproof elastic sealing pad according to claim 1 is characterized in that: The simulation of the elastic sealing gasket design is performed in the finite element model, further comprising: Set constraints, which are: The upper surface reaction force of the elastic sealing gasket is no greater than the assembly force of the shield machine, and no greater than the assembly force that causes damage to the shield segment groove. The hole size meets the production process requirements.

8. A design system for waterproof elastic sealing pads for shield tunnel joints, characterized in that: include: Finite element model building module: This module builds a finite element model based on the target project's shield segment groove shape, the outer contour of the waterproof elastic sealing gasket, and the holes in the elastic sealing gasket's initial design described by a B-spline curve. Simulation module: Based on the above initial design scheme, simulation of elastic sealing gasket design is performed in the finite element model; Optimization design module: using explicit topology optimization method to iteratively optimize the simulation results, obtain explicit expression of hole B-spline curve, and determine the elastic sealing gasket section that meets the design requirements; Wherein, the simulation module includes: Construction and assembly simulation submodule: used to apply external loads and simulate the construction and assembly process of the elastic sealing gasket; Contact simulation submodule: structural optimization considering nonlinear boundary conditions of contact, used to simulate the contact between the elastic sealing gasket and the groove, and between the sealing gaskets; Compression process simulation submodule: Considering the holes of the elastic sealing gasket as self-contact, the mechanical characteristics of the holes in the sealing gasket during the compression process are simulated; Physical and mechanical properties simulation submodule: Considering the nonlinearity of the elastic sealing gasket material, it is used to simulate the physical and mechanical properties of the elastic sealing gasket; Gasket deformation simulation submodule: Considers the geometric nonlinearity of elastic gasket deformation and is used to simulate the large deformation characteristics of the gasket during compression.

9. An electronic terminal comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, it can be used to perform the method according to any one of claims 1 to 7, or run the system according to claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, it can be used to perform the method according to any one of claims 1 to 7, or to run the system according to claim 8.

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