Design method and system for waterproof elastic sealing gasket of shield tunnel joint and terminal

Abstract

The invention discloses a method for designing a waterproof elastic sealing gasket for a shield tunnel joint, which comprises the following steps of: establishing a finite element model according to the shape of a shield segment groove of a target project, the outer contour of the waterproof elastic sealing gasket and an elastic sealing gasket initial design scheme hole described by adopting a B spline curve; based on the initial design scheme, analog simulation of the design of the elastic sealing gasket is carried out in the finite element model; and carrying out iterative optimization design on the analog simulation result by utilizing an explicit topological optimization method to obtain a final hole B spline curve explicit expression, and determining the elastic sealing gasket section meeting the design requirement. Meanwhile, the invention further provides a corresponding shield tunnel joint waterproof elastic sealing gasket design system, a terminal and a medium. According to the method, under the condition that the shield segment groove is determined, the elastic sealing gasket section meeting the design requirement can be obtained through topological optimization, and the technical problems that in the prior art, efficiency is low, and economical efficiency is poor are solved.

Description

Technical Field

[0001] The 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, and there are a large number of longitudinal and circumferential seams between the segments. The waterproofing of these joints is often the weak link in the tunnel waterproofing system. Reliable joint waterproofing design is an important guarantee for the normal use of shield tunnels. At present, the joints of domestic shield tunnels mainly use the compaction of EPDM rubber joint materials to achieve the purpose of waterproofing, which plays a major role in waterproofing. By improving the cross-sectional shape of the sealing gasket and opening holes in the sealing gasket to control the contact surface stress, the water-stopping effect can be ensured.

[0003] At present, the design method of elastic gasket section of shield tunnel joint is mainly based on trial and error, which mainly relies on experience to design multiple gasket sections, and then selects the relatively better gasket section through numerical analysis or experiments. This method has the disadvantages of low efficiency and poor economic performance, and it is often difficult to obtain the most reasonable section form.

[0004] After searching, Chinese patent application CN202110673139.2 discloses a shield tunnel segment joint gasket cross-section optimization method and system, which establishes a 2.5D cross-section model and finite element model of the gasket and the groove, applies load to the gasket finite element model to complete compression simulation, extracts the gasket surface contact stress distribution, uses the cone plane contact model and the Roth model to establish a microscopic gasket surface leakage model, derives the leakage rate formula based on the leakage model, and calculates the leakage rate; optimizes the gasket cross-section with 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 gasket design methods. Summary of the invention

[0005] In view of the defects in the prior art, the purpose of the present invention is to provide a design method, system and terminal for waterproof elastic sealing pads for shield tunnel joints. The elastic sealing pads with a certain outer contour are optimized and an optimized elastic sealing pad design is generated, so that the sealing pads can achieve the maximum waterproof capability and meet the design requirements.

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

[0007] A finite element model is established based on the shield segment groove shape of the target project, the outer contour of the waterproof elastic sealing pad, and the holes of the elastic sealing pad initial design described by the B-spline curve;

[0008] Based on the above initial design scheme, a simulation of 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] - Apply 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 gasket and the groove, and between the gaskets;

[0014] - Considering the holes of the elastic gasket as self-contact, the mechanical characteristics of the holes in the gasket during compression 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 lateral limiting 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, a contact pressure is applied to the elastic sealing gasket through a 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 pad for a shield tunnel joint is provided, comprising:

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

[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 contact nonlinear boundary conditions, used to simulate the contact between the elastic sealing pad and the groove, and between the sealing pads;

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

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

[0034] Gasket deformation simulation submodule: It takes into account 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 design method for waterproof elastic sealing pads for shield tunnel joints when executing the program, or to run the above-mentioned design system for waterproof elastic sealing pads for shield tunnel joints.

[0036] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is used to execute the above-mentioned design method for 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.

[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 of the shield tunnel joint waterproof elastic sealing pad provided by the present invention can achieve the elastic sealing pad cross-section that meets the design requirements through topological optimization when the shield segment groove is determined, and can be directly used in the CAD / CAE system, overcoming the technical problems of low efficiency and poor economy in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0040] Figure 1 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 It 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 A schematic diagram of an optimization region of a design method in one embodiment of the present invention;

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

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

[0048] The present invention is described in detail below in conjunction with 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 of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0049] Most of the current shield tunnel joint elastic sealing gasket section design methods are still based on trial and error, mainly relying on experience to design multiple sealing gasket sections, and then selecting a relatively optimal sealing gasket section through numerical analysis or experiments. This method has low efficiency and poor economy, and it is often difficult to obtain the most reasonable section form. Moreover, it is difficult to achieve the maximum waterproof capability of the sealing gasket in the design of shield tunnel joint waterproof sealing gaskets.

[0050] In order to solve the above-mentioned problems, the present invention provides a method for designing waterproof sealing gaskets for shield tunnel joints, which can optimize elastic sealing gaskets with a certain outer contour according to the groove shape of the shield segment of the target project and generate an optimized elastic sealing gasket design scheme under the condition that the external load (assembly force) does not exceed a limit value, so as to enable the sealing gasket to achieve 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 shield segment groove shape of the target project, the outer contour of the waterproof elastic sealing pad, and the initial design holes of the elastic sealing pad described by the B-spline curve;

[0053] In this step, according to the segment joint shield segment groove shape of the target project, the outer contour shape of the elastic sealing gasket is determined, and the topological optimization design area surrounded by the outer contour of the elastic sealing gasket is created, meshing is performed, and a finite element mesh model is established. The topological optimization design area is the part to be optimized in the subsequent simulation.

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

[0055]

[0056] Where P i =(x i ,y i ) T (i=0, ..., n) are the coordinates of the control points 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 ith 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 above initial design scheme, performing a simulation of elastic sealing gasket design in the finite element model;

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

[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 gasket material, it is used to simulate the physical and mechanical properties of the elastic 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 to iteratively optimize the results of the simulation, obtain an explicit expression of the final hole B-spline curve, and determine the elastic sealing gasket section that meets the design requirements. Generally speaking, meeting the design requirements means that the upper surface reaction force of the elastic sealing gasket is not greater than the shield machine assembly force, and is not greater than the assembly force that causes the shield segment groove to be damaged; the objective function value is greater than the waterproof capacity 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 result is more in line with practical applications. For example, refer to Figure 2 The contact nonlinearity in one embodiment shown in the figure is that S1 and S2 are contact surfaces, and SC1 to SC9 are 9 set 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(Min(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 the above S200, the simulation of the elastic sealing pad design in the finite element model further includes: setting a constraint condition, wherein the constraint condition is: the upper surface reaction force of the elastic sealing pad is not greater than the shield machine assembly force, and is not greater than the assembly force that causes the shield segment groove to be damaged. The hole size meets the production process requirements. This constraint can more accurately ensure that the designed sealing pad meets the actual application needs.

[0071] In some possible embodiments, in the above S200, the simulation of the elastic sealing pad design is performed in the finite element model, and also includes: setting material parameters, the elastic sealing pad material can adopt the Mooney-Riv lin 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 pad material models can also be used, and are not limited to the above-mentioned Mooney-Riv lin model or Yeoh model.

[0072] The above-mentioned preferred features can be used in any combination without conflicting with each other. The above-mentioned embodiment of the present invention can make the sealing gasket achieve the maximum waterproof capability 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 pads for shield tunnel joints is provided, including: a finite element model building module, a simulation module and an optimization design module. The finite element model building module builds a finite element model according to the groove shape of the shield segment of the target project, the outer contour of the waterproof elastic sealing pad and the initial design holes of the elastic sealing pad described by the B-spline curve; the simulation module performs simulation of the design of the elastic sealing pad 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 results of the simulation, obtains an explicit expression of the hole B-spline curve, and determines the elastic sealing pad section that meets the design requirements.

[0074] The above-mentioned simulation module includes: a construction 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, simulate the mechanical characteristics of the holes of the sealing gasket during the compression process;

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

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

[0080] The various modules of the design system of the shield tunnel joint waterproof elastic sealing pad of the present invention correspond to the various 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-mentioned embodiments of the present invention can optimize the design of the waterproof elastic sealing pad of the shield tunnel joint by using the finite element model and the explicit topology optimization method, so that the sealing pad can achieve the maximum waterproof ability and meet the design requirements. Among them, the explicit topology optimization method uses B-spline curves to describe the holes of the initial design of the elastic sealing pad, combines the shape of the shield segment groove and the outer contour of the waterproof sealing pad, establishes a finite element calculation model, uses a general finite element simulation platform as a simulation solver, selects an explicit analysis module, and sets a geometric nonlinear analysis. Through topology optimization design, an explicit expression of the hole B-spline curve is obtained, thereby determining the elastic sealing pad section that meets the design requirements.

[0082] Topology optimization is a method of designing material distribution in a given design domain according to loads and constraints 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 optimization 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 finite element analysis in 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 optimization 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 examples.

[0084] Specifically, the shield tunnel joint waterproof elastic sealing pad to be designed in this embodiment, the shield segment groove design scheme is 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 pad in this embodiment includes the following steps:

[0086] Step 1: Combined with 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 curve, 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 enclosed 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 are used to describe the holes in the initial design of the elastic gasket;

[0089]

[0090] Where P i =(x i ,y i ) T (i=0, ..., n) are the coordinates of the control points 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 ith 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 Shown is a sealing gasket solution for initial structural holes.

[0092] Step 2: Create a segment groove in the finite element model to simulate the side limit 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 illustrated.

[0094] Step 3: Set the boundary conditions of the finite element model, apply all degrees 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 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, the waterproof sealing gasket is 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: The surfaces that may contact between the gasket and the shield segment groove are set to contact, the holes of the gasket are set to self-contact, and the mechanical parameters of the contact surface are set;

[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 up.

[0099] Step 6: Set the constraint conditions, the reaction force on the upper surface of the sealing gasket is not greater than the assembly force of the shield machine, and is not 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, and the contact stress P is the maximum value. P is the smaller value of the median contact stress or average contact stress P1 between the gasket and the shield segment groove and the median contact stress or average contact stress P2 on the upper surface of the gasket. According to previous research and engineering experience, the greater the contact stress, the stronger the waterproof ability of the gasket.

[0101] Step 8: Perform optimization design in the 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 in step 1 = (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 specific explicit analysis module can also use the explicit module of the general finite element software. Geometric nonlinear analysis can be selected in the general finite element software. Because the sealing gasket is greatly deformed when compressed, considering geometric nonlinearity can reflect the actual force 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 the design of conventional sealing gaskets.

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

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

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

[0109] In this example, explicit topology optimization technology (steps 1, 8) is used to achieve efficient convergence of topology optimization, solving the technical problems of difficult convergence and low solution efficiency of traditional implicit topology optimization; because of the explicit description technology of deformable holes, the optimization results can be seamlessly connected with the CAD system, solving the technical problem of difficulty in using topology optimization results. In this example, a deformable hole means that the shape, size and position of the hole will change when the coordinates of the control point of the hole change, so it is a deformable hole.

[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, which solves 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 result cannot be obtained.

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

[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 executable on the processor, wherein the processor executes the program to execute the design method for the waterproof elastic sealing pad for the joints of a shield tunnel in any one of the above-mentioned embodiments, or to run the design system for the waterproof elastic sealing pad for the joints of a shield tunnel in the above-mentioned 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] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, 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 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 flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, 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 flowchart and / or block diagram. 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 capable of directing a computer or other programmable data processing device to operate 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 A 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 operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified 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 can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A design method for waterproof elastic sealing pads for shield tunnel joints, characterized in that: include: A finite element model is established based on the shield segment groove shape of the target project, the outer contour of the waterproof elastic sealing pad, and the holes of the elastic sealing pad initial design described by the B-spline curve; Based on the above initial design scheme, a simulation of 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: - Apply 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 holes in the gasket during compression are simulated; - Considering the nonlinearity of elastic gasket materials, it is used to simulate the physical and mechanical properties of elastic gaskets; -The geometric nonlinearity of elastic gasket deformation is considered 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 described by a B-spline curve are meshed, 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 lateral limiting 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, a contact pressure is applied to the elastic sealing gasket through a contact surface.

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

7. The design method of the 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, and further includes: 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, and 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: build a finite element model based on the target project's shield segment groove shape, waterproof elastic sealing gasket outer contour, and elastic sealing gasket initial design holes described by B-spline curves; 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 contact nonlinear boundary conditions, used to simulate the contact between the elastic sealing pad and the groove, and between the sealing pads; Compression process simulation submodule: Considering the holes of the elastic sealing gasket as self-contact, simulate the mechanical characteristics of the holes of the sealing gasket during the compression process; Physical and mechanical properties simulation submodule: Considering the nonlinearity of elastic sealing gasket materials, it is used to simulate the physical and mechanical properties of elastic sealing gaskets; Gasket deformation simulation submodule: It takes into account 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, characterized in that: When the processor executes the program, it can be used to execute the method described in any one of claims 1 to 7, or to run the system described in 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 execute the method described in any one of claims 1 to 7, or to run the system described in claim 8.

Images