Simulation method and system for construction of shield tunnel internal structure based on tracking unit method

Abstract

The present invention provides a method and system for simulating the construction of the internal structure of a shield tunnel based on a tracking unit method, and relates to the technical field of shield tunnel simulation. The method comprises: establishing a numerical calculation model of a shield tunnel and its internal structure, wherein the numerical calculation model comprises a segment ring unit and an internal structure unit; based on the tracking unit method, replicating the nodes of the internal structure unit to generate a tracking unit; the tracking unit shares nodes with the internal structure unit, and the tracking unit maintains a preset stiffness; the internal structure unit is removed during the water and soil load application stage, and the tracking unit is deformed along with the segment ring unit; during the internal structure construction stage, the internal structure unit is activated with no initial strain, and the activated internal structure unit is fully fitted with the deformed segment lining, so that the construction process of the internal structure in the actual construction process can be truly and accurately simulated, and the stress and deformation of the shield tunnel and the internal structure can be truly reflected.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunnel simulation, and in particular to a method and system for simulating the construction of the internal structure of a shield tunnel based on a tracking unit method. Background Art

[0002] The process of simulating the application of the internal structure of a shield tunnel in ABAQUS is usually divided into two steps. In the first step, only the shield tunnel segment ring bears the water and soil loads, so only the shield tunnel segment ring model needs to be established in the numerical calculation model. However, since the internal structure needs to be applied to the shield tunnel in the second step, the internal structure model needs to be established in advance in the first step, and then the internal structure unit is removed by using the death unit command (Model change, remove) in ABAQUS to ensure that only the shield tunnel segment ring bears the water and soil loads. In the second step, the internal structure unit is activated by using the activation unit command (Model change, add) in ABAQUS, so that it and the shield tunnel segment ring can jointly bear other external variable loads. However, at this time, due to the water and soil loads, the segment has already deformed to a certain extent, while the internal structure remains undeformed after being activated. The internal structure and the deformed segment ring invade and disengage from each other, which seriously affects the convergence of the numerical simulation and does not conform to the actual internal structure application during the construction process. Summary of the invention

[0003] The purpose of the present invention is to provide a method and system for simulating the construction of the internal structure of a shield tunnel based on the tracking unit method to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0004] In a first aspect, the present invention provides a method for simulating the construction of an internal structure of a shield tunnel based on a tracking unit method, comprising:

[0005] Acquire segment ring and internal structure data of shield tunnel construction, and establish a first numerical model based on the data, wherein the first numerical model includes a segment ring unit for bearing initial water and soil loads and an internal structure unit constructed after the segment ring unit is deformed;

[0006] Generate a tracking unit according to the internal structural unit in the first numerical model, wherein the tracking unit shares nodes and shapes with the internal structural unit and maintains a preset stiffness state, obtain a tracking unit set for recording deformation of the segment ring unit, and update the second numerical model;

[0007] Applying water and soil loads to the second numerical model based on a preset first loading condition, and obtaining a first simulation result by loading only the segment ring unit and the tracking unit and keeping the internal structure unit in a removed state, wherein the first simulation result includes deformation data of the segment ring unit and deformation data of the synchronously deformed tracking unit;

[0008] Based on the deformation data of the tracking unit in the first simulation result, the internal structural unit is activated without initial strain to fit the deformed segment ring unit to obtain the target numerical model.

[0009] In a second aspect, the present invention further provides a shield tunnel internal structure construction simulation system based on a tracking unit method, comprising:

[0010] A first model building module is used to obtain segment ring and internal structure data of shield tunnel construction, and to establish a first numerical model based on the data, wherein the first numerical model includes a segment ring unit for bearing initial water and soil loads and an internal structure unit constructed after the segment ring unit is deformed;

[0011] A second model building module is used to generate a tracking unit according to the internal structural unit in the first numerical model, wherein the tracking unit shares nodes and shapes with the internal structural unit and maintains a preset stiffness state, obtain a tracking unit set for recording the deformation of the segment ring unit, and update the second numerical model;

[0012] a first simulation module, configured to apply water and soil loads to the second numerical model based on a preset first loading condition, and obtain a first simulation result by loading only the segment ring unit and the tracking unit and keeping the internal structure unit in a removed state, wherein the first simulation result includes deformation data of the segment ring unit and deformation data of the synchronously deformed tracking unit;

[0013] The target model generation module is used to perform initial strain-free activation processing on the internal structural unit based on the deformation data of the tracking unit in the first simulation result to fit the deformed segment ring unit to obtain the target numerical model.

[0014] The beneficial effects of the present invention are:

[0015] The present application sets a tracking unit with a "tracking function" on the basis of the internal structure unit through the tracking unit method. The tracking unit is exactly the same shape as the internal structure unit, shares nodes, but has a different unit number. After the internal structure unit is removed, the tracking unit does not affect the stress of the original segment ring unit, and deforms together with the segment ring unit. At the same time, because it shares unit nodes with the previously removed internal structure unit, the internal structure unit can be activated when the internal structure needs to be constructed. The activated internal structure unit can obtain the position of the tracking unit after deformation, and the internal structure is fully fitted with the deformed segment lining, which can truly and accurately simulate the construction process of the internal structure in the actual construction process, and truly reflect the stress and deformation of the shield tunnel and the internal structure.

[0016] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a flow chart of a method for simulating the internal structure of a shield tunnel based on the tracking unit method according to an embodiment of the present application;

[0019] Figure 2 The deformation process of the internal structure of the shield tunnel when no tracking unit is set;

[0020] Figure 3 After the tracking unit is set in the embodiment of the present application, the internal structure of the shield tunnel is deformed;

[0021] Figure 4 This is a structural diagram of a simulation system for the internal structure of a shield tunnel based on the tracking unit method in an embodiment of the present application.

[0022] Markings in the figure:

[0023] 400 - first model building module; 500 - second model building module; 510 - first building unit; 520 - first generating unit; 530 - first acquiring unit; 540 - second generating unit; 600 - first simulation module; 700 - target model generating module; 800 - control model generating module; 900 - second simulation module. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In recent years, with the expansion of application fields and the rapid progress of shield technology, shield tunnels have been developing towards large cross-sections, long distances, deep burials, high water pressure, composite strata and complex geological conditions. In order to adapt to the multi-functional needs of tunnels, the internal structure of shield tunnels has gradually become richer. The internal structure is usually composed of beams, plates, columns and other components. The structural type of the internal structure and the connection method between the internal structure and the pipe segment are complex and diverse, which has an important impact on the mechanical properties of the pipe segment lining.

[0027] ABAQUS has become the preferred software for calculating the mechanical properties of the shield tunnel segment-internal structure composite system with its powerful nonlinear analysis function and rich material model library. In the three-dimensional refined numerical calculation model of the shield tunnel segment-internal structure composite system, the key to ensure the reliability of the calculation results is to reasonably simulate the timing of the construction of the internal structure. According to the engineering characteristics of the shield tunnel project, during the construction of the shield tunnel, the segment ring is often deformed by water and soil pressure after it is removed from the shield machine, while the internal structure is constructed after the deformation of the segment is stable and basically does not bear water and soil pressure. If the internal structure is constructed at the same time as the segment, the internal structure will bear the water and soil pressure together with the segment, which is significantly different from the actual project. Therefore, in the calculation simulation, it is required to construct the internal structure after the segment structure is deformed, and the shape of the internal structure should be coordinated with the deformed segment structure. However, in the actual calculation simulation, if the internal structure is directly constructed after the segment ring is deformed by water and soil pressure, the segment ring has been deformed from the initial shape, while the internal structure is in the initial shape, resulting in mutual intrusion and overlap between the two, which is also inconsistent with the actual project.

[0028] The internal structure should be constructed after the deformation of the segment ring is stable. The internal structure basically does not bear the water and soil pressure load, and only bears the operation load together with the segment structure. In the stage of applying water and soil load, only the shield tunnel segment ring bears the water and soil load, so only the shield tunnel segment ring model needs to be established in the numerical calculation model. However, since the internal structure needs to be applied to the shield tunnel in the second step, the internal structure model needs to be established in advance in the first step, and then the death unit command (Model change, remove) in ABAQUS is used to remove (kill) the internal structure unit first, that is, only the shield tunnel segment ring bears the load in the first step. In the second step, the activation unit command (Modelchange, add) in ABAQUS is used to activate the internal structure unit so that it and the shield tunnel segment ring share the external variable load. However, since this method activates the unit at the original position of the unit when activating the unit, in actual structural analysis, it is often necessary to activate the internal structure unit in a way without initial strain at the position after the deformation of the shield tunnel segment ring, which cannot meet the actual needs. Therefore, the present invention proposes a method for applying the internal structure without initial strain at the position of the deformed shield tunnel segment ring, and the timing of the internal structure application can be considered. The method mainly realizes the reasonable application of the internal structure by modifying the inp file in ABAQUS.

[0029] Embodiment 1:

[0030] This application provides a simulation method for the internal structure of a shield tunnel based on the tracking unit method. Figure 1 , including steps S100, S200, S300 and S400;

[0031] Step S100: acquiring segment ring and internal structure data of shield tunnel construction, and establishing a first numerical model based on the data, wherein the first numerical model includes a segment ring unit for bearing initial water and soil loads and an internal structure unit constructed after the segment ring unit is deformed, and the specific implementation method is as follows:

[0032] Obtain the segment ring and internal structure data of the shield tunnel construction to be simulated, establish the shield tunnel and its internal structure and other related components in ABAQUS, set material parameters, interactions, mesh division, boundary conditions and load conditions, etc., establish a numerical calculation model of the shield tunnel and its internal structure, and obtain the first numerical model, which includes segment ring units and internal structure units. At the same time, it is necessary to set Set in the Part module, and use the "Write Output File" command in the ABAQUS job to generate the inp file of the numerical calculation model.

[0033] Step S200, generating a tracking unit according to the internal structural unit in the first numerical model, wherein the tracking unit shares nodes and shapes with the internal structural unit and maintains a preset stiffness state, obtaining a tracking unit set for recording deformation of the segment ring unit, and updating the second numerical model; the step of generating the tracking unit specifically includes steps S210 and S220;

[0034] Step S210: Obtain node information, unit quantity information and numbering information of the internal structural unit, establish a tracking unit according to the same node and unit quantity as the internal structural unit; generate a number for the tracking unit based on the numbering information of the internal structural unit, the number of the tracking unit is greater than the number of the internal structural unit, and the specific implementation method is as follows:

[0035] Open the inp file generated in step S100, create an internal structure tracking unit set based on the internal structure unit, locate ** Section: X, where X is the name of the part section of the tracking unit to be set, and add the following command code on the line above *End Part:

[0036] *elcopy, element shift=XX, old set=XXX, new set=XXXX, shiftnodes=0

[0037] *Solid Section, elset=XXXX, material=XXXX

[0038] Among them, elcopy is the command for copying the unit, that is, copying the internal structure unit to generate a new tracking unit. The element shift=XX command is the definition of the "tracking unit" number, where XX represents the starting number of the tracking unit. Since the tracking unit number cannot conflict with the internal structure unit number, XX is generally required to be slightly larger than the maximum number of the internal structure unit, otherwise an error message of repeated material definition will appear, but it should not be set too large. In the old set=XXX command, XXX is the name of the defined internal structure unit set. In the new set=XXXX command, XXXX is the name of the tracking unit set, which can be defined according to requirements, but cannot be consistent with the name of the internal structure unit set. The shiftnodes=0 command indicates that the newly added tracking unit set XXXX shares unit nodes with the internal structure unit set XXX. *Solid Section, elset=XXXX,material=XXXX commands define the name of the unit set and the name of the material of the newly added tracking unit, respectively. Appropriate names can be defined according to requirements.

[0039] Step S220, obtaining first material property information of the internal structure unit, that is, the material parameters set in step S100, wherein the first material property information includes the density, elastic modulus and Poisson's ratio of the internal structure; based on the first material property information, generating second material property information of the tracking unit, wherein the second material property includes the density, elastic modulus and Poisson's ratio of the tracking unit; the material of the tracking unit is generally defined as completely elastic, and its effect on the deformation of the shield tunnel is negligible; the specific implementation method is exemplified as follows:

[0040] Based on the modified inp file in step S210, locate **MATERIALS and add the following command code below the internal structure material property code:

[0041] *Material, name=XXXX

[0042] *Density

[0043] A,

[0044] *Elastic

[0045] B, C

[0046] The *Material, name=XXXX command is the material name of the defined tracking unit, and its name must be consistent with the previous code. The next four lines of code define the material density A, elastic modulus B, and Poisson's ratio C of the tracking unit respectively. In order to meet the condition that the internal structure "tracking unit" is completely elastic and avoid the problem of excessive deformation of the internal structure due to its own weight, the elastic modulus and density of the tracking unit material should be at least 5 orders of magnitude smaller than the actual internal structure, and the Poisson's ratio of the tracking unit can be consistent with the Poisson's ratio of the internal structure.

[0047] In this step, by executing the modified code, an updated second numerical model can be obtained, which has an additional tracking unit compared to the first numerical model, for tracking the subsequent deformation state of the segment ring unit.

[0048] Step S300: applying water and soil loads to the second numerical model based on a preset first loading condition, and obtaining a first simulation result by loading only the segment ring unit and the tracking unit and keeping the internal structure unit in a removed state, wherein the first simulation result includes deformation data of the segment ring unit and deformation data of the synchronously deformed tracking unit; the specific implementation method of loading only the segment ring unit and the tracking unit and keeping the internal structure unit in a removed state is as follows:

[0049] Based on the modified inp file in step S200, locate the analysis step where the unit needs to be removed *Restart, write, frequency=0, and add the following command code in the line below it:

[0050] *Model Change, remove

[0051] XXX,

[0052] The command is to remove the unit in this analysis step so that it does not participate in the model calculation. The unit set XXX to be removed here is the internal structure unit set mentioned above. If there are multiple internal structures to be removed, you can add several lines of code in the same way as this code.

[0053] This step simulates the process of shield tunnel segment ring independently bearing water and soil loads, so the internal structural unit needs to be removed (Model change, remove), but the tracking unit is retained in the simulation process. Its stiffness is very small, and its existence does not affect the calculation results of the original structure. In addition, the self-weight of the unit is infinitely small, so it will not cause excessive stress and deformation to the unit due to its self-weight. By executing the modified code, the tracking unit and the segment ring unit deform together under the action of water and soil loads during simulation, and the position of the segment ring unit after deformation can be determined.

[0054] Step S400: Based on the deformation data of the tracking unit in the first simulation result, the internal structural unit is activated without initial strain to fit the deformed segment ring unit, and a target numerical model is obtained. The internal structural unit in the target numerical model is in a state of fitting with the segment ring unit. The specific implementation method is exemplified as follows:

[0055] In the inp file, locate the analysis step where the unit needs to be activated *Restart, write, frequency=0, and add the following command code in the line below it:

[0056] *Model Change, add=strain free

[0057] XXX,

[0058] This command reactivates the internal structural units without initial strain. The activated unit set XXX here is the internal structural unit set mentioned above. If multiple internal structures need to be activated, several lines of code can be added in the same format as this code.

[0059] After executing the above code, the internal structure unit is activated. Since it shares unit nodes with the tracking unit, the activated internal structure unit can obtain the position of the tracking unit after deformation, that is, in the target numerical model, the internal structure is fully fitted with the deformed segment lining.

[0060] Optionally, after the internal structural unit is activated without initial strain, the tracking unit is removed. That is, since the correct position of the internal structure has been determined by the tracking unit, the tracking unit set can be removed (Model change, remove) in this analysis step. The code for removing the tracking unit is similar to that in step S300.

[0061] It should also be noted that because the tracking unit is created by modifying the inp file, it is impossible to establish its interaction relationship with other components by modifying the inp file. Therefore, it is also necessary to import the modified inp file into the ABAQUS software for processing to establish the interaction relationship before simulation can be performed. The specific operations are:

[0062] Import the modified inp file in the above steps into ABAQUS. During the import and modification of the inp file, ABAQUS will execute the above commands, and then establish the interaction relationship between the tracking unit and the tunnel lining unit, the tracking unit and the internal structure unit before submitting the calculation, and then save the established cae model and submit it for calculation and analysis.

[0063] In order to explore the influence of the construction timing of the internal structure on the mechanical properties of the shield tunnel, based on the above-mentioned embodiment, the method of the present application further includes step S500: based on the preset deformation condition, by adjusting the load parameter or displacement parameter in the target numerical model, a control numerical model with different tunnel deformation results is obtained, and the tunnel deformation result is used to reflect the construction timing of the internal structure;

[0064] Based on the preset second loading condition, additional load is applied to each control numerical model to obtain a second simulation result, which includes mechanical performance data of the shield tunnel under different construction times of the internal structure.

[0065] Since the timing of adjusting the internal structure refers to choosing when to activate the "killed" internal structural units, that is, considering activating the internal structural units when the tunnel reaches different deformation amounts, different deformation amounts can represent different timings of adjustment;

[0066] If the tunnel deformation is controlled by load, the size of the load in the inp file is modified to control the deformation; if the tunnel deformation is controlled by displacement, the size of the displacement in the inp file is modified to control the deformation. The size of the applied load or displacement generally needs to be determined by back calculation based on the preset deformation conditions. For example, if the tunnel ovality is 3‰, 4‰, and 5‰, the size of the load or displacement corresponding to the ovality is calculated, and then the size of the load or displacement in the inp file is modified according to the calculation results to achieve different deformations of the tunnel, which represents different construction times.

[0067] Each control numerical model has a corresponding inp file. Different inp files are imported into ABAQUS for processing to form different cae files and submitted for calculation. The second simulation result obtained is the result of the joint deformation of the internal structure and the segment ring under the action of additional loads. The additional load refers to other loads except water and soil loads, which are borne jointly by the internal structure and the segment ring.

[0068] The second simulation result includes the mechanical performance data of the shield tunnel under different construction times of the internal structure. By analyzing the results, the appropriate construction time of the internal structure can be obtained.

[0069] Based on the same technical concept, in step S200, in addition to establishing tracking units for entity units such as internal structures, tracking units for truss units such as steel bars and beam units such as connecting bolts may also be established.

[0070] When establishing a truss tracking unit for a truss unit such as a steel bar, the first two lines of code are consistent with the code for establishing a "tracking unit" for an internal structural solid unit, and the third line is used to set the cross-sectional area of ​​the truss unit.

[0071] When establishing a beam tracking unit for beam units such as connecting bolts: the first two lines of code are basically the same as the code for establishing a tracking unit for an internal structural solid unit. The difference is that they also include temperature change attributes and direction attributes. Specifically, the second line of code can set the temperature change and the section type needs to be set, which can be set to a circular section such as CIRC; the third line of code sets the radius of the circular section, and the fourth line of code is the direction of the beam unit.

[0072] like Figure 2 This is the deformation process of directly activating the internal structure unit without setting the tracking unit. The states from left to right are: removing the internal structure unit, the segment ring unit bearing the deformation of water and soil loads, and activating the internal structure unit. It can be seen that after activation, the internal structure and the segment lining partially invade each other and partially detach from each other.

[0073] like Figure 3The deformation process of the internal structure unit is shown after the tracking unit is set for this application. The states from left to right are: removing the internal structure unit (retaining the tracking unit), the segment lining and the tracking unit bear the deformation of water and soil loads, activating the internal structure unit, and the internal structure unit and the segment lining are subjected to joint force. It can be seen that the internal structure after activation can fit fully with the segment lining, and the internal structure can effectively help the segment ring to jointly bear the load.

[0074] The present application sets a tracking unit with a "tracking function" on the basis of the internal structural unit through the tracking unit method. The tracking unit is exactly the same shape as the internal structural unit and shares nodes, but has a different unit number. The stiffness of the tracking unit is very small, and its existence does not affect the calculation results of the original structure. The dead weight of the unit can be infinitely small, so that the unit will not produce excessive stress and deformation due to its dead weight. After adding the tracking unit, the numerical calculation model actually includes three parts: one is the internal structural unit that needs to be removed, the second is the segment ring unit that does not need to be removed, and the third is the tracking unit with a tracking function. If the internal structural unit is removed (Model change, remove), the model will consist of two parts: the tracking unit and the segment ring unit. Since the stiffness of the tracking unit is very small, it basically does not affect the stress of the original shield tunnel segment lining, and deforms together with the original shield tunnel segment lining. At the same time, since it shares unit nodes with the internal structural units that were previously removed, the internal structural units can be activated when the internal structure needs to be constructed. The activated internal structural units can obtain the deformed position of the tracking unit, and the internal structure is fully fitted with the deformed segment lining. The internal structure and the shield tunnel segment lining jointly bear the external load changes.

[0075] Second, see Figure 4 The present application also provides a shield tunnel internal structure construction simulation system based on the tracking unit method, including:

[0076] A first model building module 400 is used to obtain segment ring and internal structure data of shield tunnel construction, and to establish a first numerical model based on the data, wherein the first numerical model includes a segment ring unit for bearing initial water and soil loads and an internal structure unit constructed after the segment ring unit is deformed;

[0077] A second model building module 500 is used to generate tracking units according to the internal structural units in the first numerical model, wherein the tracking units share nodes and shapes with the internal structural units and maintain a preset stiffness state, obtain a tracking unit set for recording the deformation of the segment ring unit, and update the second numerical model;

[0078] The first simulation module 600 is used to apply water and soil loads to the second numerical model based on a preset first loading condition, and obtain a first simulation result by loading only the segment ring unit and the tracking unit and keeping the internal structure unit in a removed state, wherein the first simulation result includes deformation data of the segment ring unit and deformation data of the synchronously deformed tracking unit;

[0079] The target model generation module 700 is used to perform initial strain-free activation processing on the internal structural unit based on the deformation data of the tracking unit in the first simulation result to fit the deformed segment ring unit to obtain the target numerical model.

[0080] As an optional implementation, the shield tunnel internal structure construction simulation system based on the tracking unit method further includes:

[0081] A reference model generation module 800 is used to obtain a reference numerical model with different tunnel deformation results by adjusting the load parameters or displacement parameters in the target numerical model based on a preset deformation condition, wherein the tunnel deformation results are used to reflect the construction timing of the internal structure;

[0082] The second simulation module 900 is used to apply additional loads to each control numerical model based on a preset second loading condition to obtain a second simulation result, wherein the second simulation result includes mechanical performance data of the shield tunnel under different construction times of the internal structure.

[0083] As an optional implementation, the second model building module 500 includes:

[0084] A first construction unit 510 is used to obtain node information, unit quantity information and numbering information of the internal structural unit, and to establish a tracking unit according to the same node and unit quantity as the internal structural unit;

[0085] The first generating unit 520 is configured to generate a number for the tracking unit based on the numbering information of the internal structure unit, wherein the number of the tracking unit is greater than the number of the internal structure unit.

[0086] As an optional implementation, the second model building module 500 further includes:

[0087] A first acquisition unit 530, configured to acquire first material property information of the internal structure unit, wherein the first material property information includes density, elastic modulus, and Poisson's ratio of the internal structure;

[0088] The second generating unit 540 is used to generate second material property information of the tracking unit based on the first material property information, wherein the second material property includes density, elastic modulus and Poisson's ratio of the tracking unit; the elastic modulus and density of the tracking unit are at least 5 orders of magnitude smaller than the elastic modulus and density of the internal structure; the Poisson's ratio of the tracking unit can be consistent with the Poisson's ratio of the internal structure.

[0089] Based on the method of embodiment 1, this embodiment also provides a computer program product, including a computer program. When the computer program is executed by a processor, the method shown in steps S100 to S400 is implemented.

[0090] Based on the method of embodiment 1, this embodiment also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method shown in the above steps S100 to S400 is implemented.

[0091] Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, USB flash drive, mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods of various implementation scenarios of the present application.

[0092] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0093] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for simulating the construction of the internal structure of a shield tunnel based on a tracking unit method, characterized in that: include: Acquire segment ring and internal structure data of shield tunnel construction, and establish a first numerical model based on the data, wherein the first numerical model includes a segment ring unit for bearing initial water and soil loads and an internal structure unit constructed after the segment ring unit is deformed; Generate a tracking unit according to the internal structural unit in the first numerical model, wherein the tracking unit shares nodes and shapes with the internal structural unit and maintains a preset stiffness state, obtain a tracking unit set for recording deformation of the segment ring unit, and update the second numerical model; Applying water and soil loads to the second numerical model based on a preset first loading condition, and obtaining a first simulation result by loading only the segment ring unit and the tracking unit and keeping the internal structure unit in a removed state, wherein the first simulation result includes deformation data of the segment ring unit and deformation data of the synchronously deformed tracking unit; Based on the deformation data of the tracking unit in the first simulation result, the internal structural unit is activated without initial strain to fit the deformed segment ring unit to obtain the target numerical model.

2. The method for simulating the construction of the internal structure of a shield tunnel based on the tracking unit method according to claim 1 is characterized in that: The method further comprises: Based on the preset deformation conditions, by adjusting the load parameters or displacement parameters in the target numerical model, a control numerical model with different tunnel deformation results is obtained, wherein the tunnel deformation results are used to reflect the construction timing of the internal structure; Based on the preset second loading condition, additional load is applied to each control numerical model to obtain a second simulation result, which includes mechanical performance data of the shield tunnel under different construction times of the internal structure.

3. The method for simulating the construction of the internal structure of a shield tunnel based on the tracking unit method according to claim 1, characterized in that: The step of generating a tracking unit according to the internal structural unit in the first numerical model comprises: Acquire node information, unit quantity information and numbering information of the internal structural unit, and establish a tracking unit according to the same node and unit quantity as the internal structural unit; A number is generated for the tracking unit based on the number information of the internal structural unit, and the number of the tracking unit is greater than the number of the internal structural unit.

4. The method for simulating the construction of the internal structure of a shield tunnel based on the tracking unit method according to claim 2, characterized in that: The step of generating a tracking unit according to the internal structural unit in the first numerical model further includes: Acquire first material property information of the internal structure unit, wherein the first material property information includes density, elastic modulus, and Poisson's ratio of the internal structure; Based on the first material property information, second material property information of the tracking unit is generated, and the second material property includes density, elastic modulus and Poisson's ratio of the tracking unit; the elastic modulus and density of the tracking unit are at least 5 orders of magnitude smaller than the elastic modulus and density of the internal structure; the Poisson's ratio of the tracking unit is consistent with the Poisson's ratio of the internal structure.

5. The method for simulating the construction of the internal structure of a shield tunnel based on the tracking unit method according to claim 1, characterized in that: The method further comprises: After the internal structural unit is activated without initial strain, the tracking unit is removed.

6. The method for simulating the construction of the internal structure of a shield tunnel based on the tracking unit method according to claim 1, characterized in that: The first numerical model also includes a truss unit and a beam unit of the shield tunnel, and the method further includes: While generating tracking units according to the internal structural units in the first numerical model, truss tracking units and beam tracking units are also generated according to the truss units and beam units, wherein the beam tracking units have temperature change attributes and direction attributes.

7. A shield tunnel internal structure construction simulation system based on tracking unit method, characterized in that: include: A first model building module is used to obtain segment ring and internal structure data of shield tunnel construction, and to establish a first numerical model based on the data, wherein the first numerical model includes a segment ring unit for bearing initial water and soil loads and an internal structure unit constructed after the segment ring unit is deformed; A second model building module is used to generate a tracking unit according to the internal structural unit in the first numerical model, wherein the tracking unit shares nodes and shapes with the internal structural unit and maintains a preset stiffness state, obtain a tracking unit set for recording the deformation of the segment ring unit, and update the second numerical model; a first simulation module, configured to apply water and soil loads to the second numerical model based on a preset first loading condition, and obtain a first simulation result by loading only the segment ring unit and the tracking unit and keeping the internal structure unit in a removed state, wherein the first simulation result includes deformation data of the segment ring unit and deformation data of the synchronously deformed tracking unit; The target model generation module is used to perform initial strain-free activation processing on the internal structural unit based on the deformation data of the tracking unit in the first simulation result to fit the deformed segment ring unit to obtain the target numerical model.

8. The shield tunnel internal structure construction simulation system based on tracking unit method according to claim 7 is characterized in that: Also includes: A control model generation module, used to obtain a control numerical model with different tunnel deformation results by adjusting the load parameters or displacement parameters in the target numerical model based on the preset deformation conditions, wherein the tunnel deformation results are used to reflect the construction timing of the internal structure; The second simulation module is used to apply additional loads to each control numerical model based on a preset second loading condition to obtain a second simulation result, wherein the second simulation result includes mechanical performance data of the shield tunnel under different construction times of the internal structure.

9. The shield tunnel internal structure construction simulation system based on tracking unit method according to claim 7, characterized in that: The second model building module includes: A first construction unit is used to obtain node information, unit quantity information and numbering information of the internal structural unit, and establish a tracking unit according to the same node and unit quantity as the internal structural unit; The first generating unit is used to generate a number for the tracking unit based on the numbering information of the internal structure unit, and the number of the tracking unit is greater than the number of the internal structure unit.

10. The shield tunnel internal structure construction simulation system based on tracking unit method according to claim 9, characterized in that: The second model building module also includes: A first acquisition unit, configured to acquire first material property information of the internal structure unit, wherein the first material property information includes density, elastic modulus, and Poisson's ratio of the internal structure; A second generating unit is used to generate second material property information of the tracking unit based on the first material property information, wherein the second material property includes density, elastic modulus and Poisson's ratio of the tracking unit; the elastic modulus and density of the tracking unit are at least 5 orders of magnitude smaller than the elastic modulus and density of the internal structure; and the Poisson's ratio of the tracking unit is consistent with the Poisson's ratio of the internal structure.

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