Shield blocking effect detection method and system for shield tunnel underneath passing underground structure group, terminal and storage medium

Abstract

The invention belongs to the technical field of shield tunnel construction, and discloses a shielding curtain blocking effect detection method and system for a shield tunnel underneath passing underground structure group, a terminal and a storage medium, and the method comprises the steps: obtaining a first construction parameter of the shield tunnel and a structure parameter of an underground structure; based on the first construction parameters and the structure parameters, constructing a numerical model of the target plot; determining the type of a constitutive model according to the material parameters of the target plot, and simulating the construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model; obtaining a cross section image of each underground structure at a preset construction moment, calculating the ellipticity of a cross section in each cross section image, and judging whether a blind blocking effect exists among all the underground structures according to the ellipticity; according to the ellipticity, a blind blocking effect coefficient between the underground structures with the blind blocking effect is calculated and output; according to the invention, the blocking effect of the blind can be quantified.

Description

Technical Field

[0001] This invention relates to the field of shield tunnel construction technology, and in particular to a method, system, terminal and storage medium for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group. Background Technology

[0002] The current mainstream trend in underground transportation networks is downward and vertical development, moving from traditional single subway lines to multi-mode collaborative development. Ultra-large diameter shield tunnels, as an efficient and safe method of underground space development, are widely used in the construction of infrastructure such as subways, highways, and railways.

[0003] In densely populated urban areas, new tunnels often inevitably need to pass under existing underground structures. However, the close proximity of new tunnel construction can disturb the surrounding soil, causing deformation of existing structures and threatening their safe operation. Existing technologies use the curtain effect to represent the shielding effect of a single existing structure on soil deformation, but this is not applicable to scenarios where new tunnels pass under existing underground structures. Therefore, a curtain barrier effect is introduced based on the curtain effect to represent the interaction between existing underground structures or between structures and soil when a new tunnel passes under an existing underground structure group. This interaction "blocks" or "shiels" the soil deformation and stress redistribution caused by the construction of the new tunnel to a certain extent, thereby reducing the direct impact on a specific structure.

[0004] Current technologies focus on studying the impact of deformation on individual existing tunnels within an underground structural group, without addressing the curtain-like barrier effect between multiple existing tunnels in an existing underground structural group when a new tunnel is constructed. Therefore, current technologies require further improvement. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that, in view of the defects of the prior art, the present invention provides a method, system, terminal and storage medium for detecting the curtain barrier effect of shield tunnels passing under underground structure groups, so as to solve the problem of the technical gap in the existing research on the curtain barrier effect of shield tunnels passing under underground structure groups.

[0006] The technical solution adopted by this invention to solve the technical problem is as follows: In a first aspect, the present invention provides a method for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group, wherein the underground structure group includes at least two underground structures, and the method for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group includes: Obtain the first construction parameters of the shield tunnel and the structural parameters of the underground structure; Based on the first construction parameters and the structural parameters, a numerical model of the target site is constructed; wherein, the target site is the target site for shield tunnel construction; The constitutive model type is determined based on the material parameters of the target site, and the construction process of the shield tunnel is simulated in the numerical model based on the first construction parameters and the constitutive model. Obtain cross-sectional images of each underground structure at a preset construction time, calculate the ellipticity of the cross section in each cross-sectional image, and determine whether there is a curtain-like obstruction effect between all the underground structures based on the ellipticity. Based on the ellipticity, calculate and output the curtain barrier effect coefficient between underground structures that exhibit a curtain barrier effect.

[0007] In one implementation, constructing a numerical model of the target site based on the first construction parameters and the structural parameters includes: Based on the first construction parameters, the boundary parameters of the target plot are determined, and a first model of the target plot is established based on the boundary parameters. Based on the structural parameters, determine the second construction parameters and location parameters of the underground structure; The underground structure is added to the first model based on the second construction parameters and the location parameters to obtain the numerical model of the target plot.

[0008] In one implementation, determining the constitutive model type based on the material parameters of the target site, and simulating the construction process of the shield tunnel based on the first construction parameters and the constitutive model type, includes: Obtain the material parameters of the target plot; The constitutive model type used in the simulation construction process of the shield tunnel is determined based on the material parameters. The ground stress of the target plot is balanced, and all the underground structures in the target plot are activated; The simulated construction process of the shield tunnel is divided into a preset number of construction segments. The constitutive model is used to simulate the shield tunnel construction process of each construction segment on the numerical model, thereby completing a construction simulation of all underground structures in the target plot.

[0009] In one implementation, the step of determining the constitutive model type based on the material parameters of the target site and simulating the construction process of the shield tunnel based on the first construction parameters and the constitutive model further includes: sequentially selecting individual underground structures in the shield tunnel that have not undergone secondary construction simulation for secondary construction simulation, until all the underground structures have completed secondary construction simulation; The method for secondary construction simulation includes: Reload the numerical model that does not simulate the construction process of the shield tunnel; Close all underground structures in the target plot, and then reactivate a single underground structure in the target plot; The ground stress of the target plot is rebalanced, and the constitutive model is used to simulate the shield tunnel construction process of each construction segment on the numerical model.

[0010] In one implementation, acquiring a cross-sectional image of each of the underground structures at a preset construction time and calculating the ellipticity of the cross-section in each cross-sectional image includes: Obtain cross-sectional images of each of the underground structures at a preset construction time; Based on the cross-sectional images and structural parameters of the underground structure, a diagram of relative deformation of the cross-section is drawn. Based on the relative deformation diagram of the cross-section, the ellipticity of the cross-section in each cross-section image is calculated.

[0011] In one implementation, determining whether a curtain-like barrier effect exists between all the underground structures based on the ellipticity includes: Select the first underground structure from all the underground structures according to the preset rules; The ellipticity of the cross section of the first underground structure at all preset construction times in the first and second construction simulations is obtained sequentially. If the ellipticity of the first underground structure at any construction time in a single construction simulation is greater than the ellipticity of the first underground structure at the same construction time in a second construction simulation, then the first underground structure is considered to be an underground structure with a curtain-like barrier effect. Based on the structural parameters of the underground structure, a second underground structure corresponding to the first underground structure is obtained. If the second underground structure is an underground structure with a curtain barrier effect, then it is determined that there is a curtain barrier effect between the first underground structure and the second underground structure.

[0012] In one implementation, calculating and outputting the curtain-blocking effect coefficient between underground structures exhibiting a curtain-blocking effect based on the ellipticity includes: A third underground structure is selected, and there is a curtain-like barrier effect between the third underground structure and the fourth underground structure. Obtain a first ellipticity, which is defined as the average of the minimum ellipticities of the third underground structure and the fourth underground structure at a preset construction time when all the underground structures in the target plot are activated. Obtain the second ellipticity, which is defined as the minimum ellipticity of the third underground structure at a preset construction time when only the third underground structure is activated in the target plot. The curtain blocking effect coefficient is calculated and output based on the first ellipticity and the second ellipticity: ; in, This is the curtain blocking effect coefficient. The first ellipticity, This is the second ellipticity.

[0013] Secondly, the present invention provides a system for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group, comprising: The parameter acquisition module acquires the first construction parameters of the shield tunnel and the structural parameters of the underground structure. The model building module is used to construct a numerical model of the target site based on the first construction parameters and the structural parameters; wherein, the target site is the target site for shield tunnel construction; The construction simulation module is used to determine the constitutive model type based on the material parameters of the target site, and to simulate the construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model. The curtain barrier effect judgment module is used to acquire cross-sectional images of each underground structure at a preset construction time, calculate the ellipticity of the cross section in each cross-sectional image, and determine whether there is a curtain barrier effect between all the underground structures based on the ellipticity. The curtain barrier effect calculation module is used to calculate and output the curtain barrier effect coefficient between underground structures that have a curtain barrier effect based on the ellipticity.

[0014] Thirdly, the present invention provides a terminal, comprising: a processor and a memory, wherein the memory stores a program for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group, and the program for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group is executed by the processor to implement the operation of the method for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group as described in the first aspect.

[0015] Fourthly, the present invention also provides a computer-readable storage medium storing a curtain obstruction effect detection program for a shield tunnel passing under an underground structure group. When executed by a processor, the curtain obstruction effect detection program for a shield tunnel passing under an underground structure group is used to implement the operation of the curtain obstruction effect detection method for a shield tunnel passing under an underground structure group as described in the first aspect.

[0016] The present invention, by employing the above technical solution, has the following effects: This invention establishes a numerical model of the target site based on the first construction parameters of a shield tunnel. By simulating the construction process of the shield tunnel, it obtains the cross-section of the existing underground structure group at a preset construction time, thereby enabling the determination of whether there is a curtain barrier effect between existing underground structures. It also provides a calculation method for calculating the curtain barrier effect between multiple existing tunnels by using ellipticity. Introducing the curtain barrier effect can reflect the interaction between existing underground structures or between structures and soil, and is applicable to the construction scheme analysis of engineering scenarios involving the interaction of complex underground structure groups. Furthermore, it proposes a curtain barrier effect coefficient to quantify the strength of the curtain barrier effect, thereby providing data support for guiding actual engineering construction. Attached Figure Description

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 This is a flowchart of the method for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group in this invention.

[0019] Figure 2 This is a cross-sectional view of the shield tunnel in this invention.

[0020] Figure 3 This is a cross-sectional view showing the relative positional relationship between the shield tunnel and the first subway line and high-speed rail line in this invention.

[0021] Figure 4 This is a schematic diagram of the numerical model of the target plot in this invention.

[0022] Figure 5 This is a schematic diagram simulating the shield tunneling process of a newly constructed railway line in this invention.

[0023] Figure 6 This is a simulated construction diagram of the shield tunnel passing under the first subway line tunnel and the high-speed rail line tunnel in the numerical model of this invention.

[0024] Figure 7 This is a schematic diagram of the survey lines and feature points for the simulated construction of a shield tunnel in this invention.

[0025] Figure 8 This is a cross-sectional diagram showing the relative deformation of the right-line tunnel of the subway in this invention.

[0026] Figure 9 This is a cross-sectional diagram showing the relative deformation of the left-line tunnel of the subway in this invention.

[0027] Figure 10 This is a schematic diagram illustrating the ellipticity calculation parameter identifier in this invention.

[0028] Figure 11 This is a curve showing the change in the cross-sectional ellipticity of the tunnel of the first subway line in this invention.

[0029] Figure 12 This is a functional schematic diagram of the terminal in one implementation of the present invention.

[0030] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0032] Exemplary methods When developing underground space using shield tunneling, the new tunnel inevitably needs to pass under existing underground structures. However, this type of close-range construction disturbs the surrounding soil, causing deformation of existing structures and threatening their safe operation. Simultaneously, the high settlement requirements of some existing structures and their deformation further threaten their safe operation; the complex geological conditions during actual construction also present significant challenges to the tunneling project.

[0033] Ultra-large diameter shield tunnels, with diameters 2-3 times that of conventional tunnels, cause greater disturbance to the strata and existing structures. Furthermore, the interaction mechanisms between existing underground structures are complex. Therefore, research on scenarios where ultra-large diameter shield tunnels pass under existing underground structures is particularly important. Current technologies for this scenario primarily employ numerical analysis methods, studying the impact of vertical clearance between new and old tunnels and reinforcement of existing structures on the deformation of individual tunnels. When constructing new tunnels under existing underground structures, the focus is often on the deformation of individual existing tunnels within the structure group, such as the shadowing effect. The shadowing effect is defined as the "shielding" effect of a new tunnel construction on the deformation of the soil above, resulting in less settlement of the soil within a certain range above the existing tunnel compared to the theoretical settlement without the tunnel. This shadowing effect is caused by the fact that the stiffness of the existing tunnel is much greater than that of the surrounding soil; the effect weakens as the distance between the new and old tunnels increases. However, current technologies have not studied the changes in tunnel cross-sections during shield tunneling, nor have they considered the shadowing effect between multiple existing underground structures within the existing underground structure group.

[0034] To address the above-mentioned technical problems, this invention provides a method for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group. The underground structure group includes at least two underground structures. The method includes: acquiring first construction parameters of the shield tunnel and structural parameters of the underground structures; constructing a numerical model of a target site based on the first construction parameters and the structural parameters; wherein the target site is the target site for shield tunnel construction; determining the constitutive model type based on the material parameters of the target site; simulating the construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model; acquiring cross-sectional images of each underground structure at a preset construction time; calculating the ellipticity of the cross-section in each cross-sectional image; determining whether a curtain barrier effect exists between all the underground structures based on the ellipticity; and calculating and outputting the curtain barrier effect coefficient between the underground structures exhibiting the curtain barrier effect based on the ellipticity.

[0035] like Figure 1 As shown, this embodiment of the invention provides a method for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group, including the following steps: Step S100: Obtain the first construction parameters of the shield tunnel and the structural parameters of the underground structure.

[0036] It should be noted that the underground structure group includes at least two underground structures, meaning that the prerequisite for the curtain barrier effect is that the existing underground structure group in the target plot of the shield tunnel construction includes at least two underground structures. When there is a curtain barrier effect between the underground structures of the existing underground structure group, the interaction between the underground structures will reduce the impact of the new line shield tunnel (for ease of explanation, shield tunnels unless otherwise specified in the following text refer to the new line shield tunnel) passing under the tunnel.

[0037] The Curtain Barrier Effect refers to the interaction between existing underground structures (such as multiple tunnels, diaphragm walls, pile foundations, etc.) or between the structure and the soil when a new tunnel passes under an existing underground structure group (such as multiple tunnels, diaphragm walls, pile foundations, etc.). This interaction causes soil deformation and stress redistribution caused by the construction of the new tunnel to be "blocked" or "shielded" to a certain extent, thus reducing the direct impact on a specific structure. Specifically, this effect manifests as a smaller decrease in the ellipticity of the cross-section caused by the new tunnel passing under the existing underground structure group due to mutual influence. By comparing the cases of single-track and double-track coexistence of existing underground structures, it was found that the change in ellipticity is smaller when double-track coexistence is observed, indicating a mutual "curtain" effect between the existing underground structures. This leads to the proposal of a Curtain Barrier Effect coefficient. The strength of the curtain barrier effect is quantified. The curtain barrier effect is an extension and development of the curtain effect at the "structure group" scale, and is more applicable to engineering scenarios involving the interaction of complex underground structure groups.

[0038] In this embodiment, the planning of a newly built line in a certain city is used as an example. After passing under the existing tunnel in the first section, the newly built line will use shield tunneling to pass under the existing first subway line, high-speed rail line, second section, industrial park and airport. The shield tunneling ends in the third section, and after passing under the fourth section to the east, it crosses the second subway line and ends in the fifth section. The total length of the line is about 3.9km, and the closed section is 3127m long.

[0039] The minimum clearance between the newly built line and the existing tunnel is 0.5m, the minimum clearance between the new line and the first subway line is 6.6m, the minimum clearance between the new line and the high-speed rail line is 27.7m, the minimum clearance between the new line and the second section is 35.4m, the minimum clearance between the new line and the industrial park is 32.9m, the minimum clearance between the new line and the airport runway is 34m, the minimum clearance between the new line and the third section is 5.6m, and the minimum clearance between the new line and the second subway line is 5.3m.

[0040] In this embodiment, the first construction parameters of the shield tunnel are obtained, namely, the construction parameters of the new line passing under the existing subway line, high-speed rail line, industrial park and airport in the form of shield tunneling, and the shield tunneling process ending in the second section.

[0041] like Figure 2 The image shows a cross-sectional view of the shield tunnel, in mm. The new line will be constructed using a twin-tube shield tunneling method, resulting in a six-lane tunnel in both directions. The shield section on one side will have an outer diameter of 14.5m and a segment thickness of 0.6m. The interior will have three lanes in each direction, with a roadway width of 3.5m + 3.5m + 3.5m. The clearance height will be 4.5m. The clearance between the left and right tunnel lines will be 14.5m. The tunnel depth will be 35.01m. The remaining space beneath the shields can be used for a utility tunnel arrangement based on actual pipeline requirements.

[0042] The primary construction parameters for a shield tunnel include the tunnel diameter, the clearance between the shield tunnel and the existing underground structure, and the clearance between the left and right tunnel lines. The tunnel diameter is the outer diameter of a single shield section. Broadly defined construction parameters also include segment thickness, road width, and clearance height, but these parameters do not affect the study of the curtain barrier effect and can be ignored.

[0043] In this embodiment, the existing underground structures that the shield tunnel passes under are mainly the first subway line and the high-speed rail line. The structural parameters of the underground structures are obtained, that is, the structural parameters of the first subway line and the high-speed rail line are obtained.

[0044] The first subway line is a northeast-southwest oriented urban express line connecting the central urban area, the airport, and more remote municipal districts. Its trains use 6A formations and are designed for a speed of 100 km / h. Figure 3 The diagram shows a cross-sectional view of the relative positions of the shield tunnel with the first subway line and the high-speed rail line. The horizontal intersection area between the first subway line and the shield tunnel is where the shield tunneling is being carried out. The shield tunnel segments have an outer diameter of 6m and a thickness of 0.3m. The intersection area is a straight line. The relative positions of the underpass nodes are shown in the diagram. Figure 3 As shown, the shield tunnel passes under the existing first metro line in the range of mileage K1+243.36 to K1+281.951. The burial depth of the first metro line at the underpass is 22.5m. The first metro line is a double track, with a net distance of 8.6m between the left and right metro lines and a vertical net distance of 6.6m between the metro line and the shield tunnel. The horizontal net distance between the left metro line and the high-speed rail tunnel is 36.7m.

[0045] The shield tunnel passes under the high-speed railway line at approximately kilometer marker DK179+370, located between Airport Station and Airport West Station, about 2901m from Airport Station. Within this section (DK179+941 to DK179+370), the high-speed railway line is a single-bore, double-track tunnel constructed using the open-cut method with ballastless track. The tunnel depth ranges from 5.66m to 10.56m. At kilometer marker DK179+370, the tunnel depth is 5.7m. The open-cut support structure uses Ø1.2m@2.4m bored piles with internal bracing. The widest point of the high-speed railway tunnel is 13.4m, the height difference between the top and bottom is 10.84m, the lateral clearance with the first subway line tunnel is 36.7m, and the lining thickness is 0.5m. The shield tunnel passes under the high-speed railway tunnel. At this node, the shield tunnel is buried at a depth of 35.1m. The closest distance between the top of the shield tunnel structure and the bottom slab of the high-speed railway tunnel structure is 18.5m, and the distance between the shield tunnel structure and the bottom of the retaining piles is about 14.5m. The main structure of the shield tunnel is located in moderately weathered mudstone.

[0046] In this embodiment, when the shield tunnel passes under an existing high-speed railway tunnel, since the existing high-speed railway tunnel is a single-bore double-track tunnel and does not have parallel tunnel lines, the shield tunnel will not experience a curtain-like obstruction effect when passing under the existing high-speed railway tunnel. Introducing this high-speed railway tunnel is to make the established model closer to reality. Similarly, the planning of the new line is described, including the second section, industrial park, and airport that the shield tunnel will pass under. This embodiment only uses this part to help determine the actual location where the shield tunnel will pass under. The first subway line is a double-track line, which may experience a curtain-like obstruction effect; therefore, the first subway line is the focus of this embodiment.

[0047] In this embodiment, the first construction parameters of the shield tunnel and the structural parameters of each underground structure are obtained, which facilitates a preliminary understanding of the existing underground structures in the target plot of the shield tunnel construction of the new line, and allows for the preliminary screening of existing underground structures that may have a curtain-like obstruction effect.

[0048] like Figure 1 As shown, this embodiment of the invention provides a method for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group, including the following steps: Step S200: Based on the first construction parameters and the structural parameters, construct a numerical model of the target site; wherein, the target site is the target site for shield tunnel construction.

[0049] Specifically, in one implementation of this embodiment, step S200 includes the following steps: Step S201: Determine the boundary parameters of the target plot based on the first construction parameters, and establish a first model of the target plot based on the boundary parameters.

[0050] In this embodiment, the first model is mainly used to simulate the part of the shield tunnel passing under the first subway line and high-speed rail line. This part is taken as the target site for the shield tunnel construction in this embodiment. The first model of the track and shield system is established by using three-dimensional geotechnical engineering finite element analysis software. In this embodiment, the first model corresponding to the target site is a three-dimensional finite element model.

[0051] As an example, the 3D geotechnical engineering finite element analysis software used in this embodiment is Plaxis 3D, which focuses on 3D simulation of geotechnical engineering and supports simulation of complex geological conditions and construction processes. Other 3D geotechnical engineering finite element analysis software that can be used include MIDAS GTS NX or FLAC3D.

[0052] Specifically, before establishing the first model, the boundary parameters of the target plot need to be determined based on the first construction parameters to eliminate the influence of boundary effects. In the area where the shield tunnel and the first subway line tunnel and high-speed rail line tunnel intersect horizontally, a distance greater than 3.5D needs to be reserved on all four sides, and a distance greater than 2D needs to be reserved at the bottom. The top is the ground. The net distance between the shield tunnel and the existing underground structure and the top can be determined based on the actual burial depth. D is the diameter of the shield tunnel.

[0053] In this embodiment, the diameter D of the shield tunnel is 14.5m. Therefore, the corresponding boundary parameters need to reserve a distance of at least 50.75m in all directions and at least 29m at the bottom. Considering that the shield tunnel is a twin-tube shield, with one shield tunnel on each side, and the net distance between the left and right shield tunnel lines is 14.5m, and the maximum horizontal net distance from the leftmost point of the left shield tunnel line to the rightmost point of the right shield tunnel line is 43.5m, the width of the boundary parameters must be at least greater than 145m. The length of the boundary parameters is based on the first ground level under which the shield tunnel passes. The subway line tunnel and the high-speed rail line tunnel have been determined. During the actual shield tunneling construction at the target site, the first underground structure the shield tunnel will pass under is the right subway line, and the last underground structure it will pass under is the high-speed rail line tunnel. The maximum horizontal distance from the starting point of the shield tunnel passing under the right subway line to the ending point of the shield tunnel passing under the high-speed rail line tunnel is 70.7m. Therefore, the length of the boundary parameter must be at least greater than 172.2m. The burial depth of the shield tunnel at the target site is 35.1m, and the diameter of the shield tunnel is 14.5m. Therefore, the height of the shield tunnel must be at least greater than 78.6m.

[0054] In this embodiment, for convenience, the boundary parameters of the target plot are rounded, and the final determined boundary parameters are 200m long, 150m wide, and 100m high. A first model of the target plot is established based on the final determined boundary parameters. Sliding constraints are set in the front, back, left, and right sides of the first model, fixed constraints are set at the bottom, and the top is a free boundary. The first model also provides the X-axis, Y-axis, and Z-axis, wherein the shield tunnel is excavated along the positive Y-axis direction.

[0055] Step S202: Determine the second construction parameters and location parameters of the underground structure based on the structural parameters.

[0056] In this embodiment, the underground structures of the target site mainly consist of a first subway line tunnel and a high-speed rail line tunnel. The first subway line tunnel includes a left subway line and a right subway line. Based on the structural parameters of each underground structure, second construction parameters and location parameters are obtained for the left subway line, the right subway line, and the high-speed rail line tunnel. The second construction parameters are used to simulate the tunnel shape and diameter of the underground structures in the first model, and the location parameters are used to ensure that the position of the underground structures in the first model is consistent with their actual positions. Based on the second construction parameters and location parameters, all underground structures in the target site can be accurately simulated in the first model.

[0057] Step S203: Add the underground structure to the first model according to the second construction parameters and the location parameters to obtain the numerical model of the target plot.

[0058] In this embodiment, based on the second construction parameters and location parameters, all existing underground structures in the target plot can be added to the first model, thereby forming a numerical model of the target plot, such as... Figure 4 As shown, Figure 4 This is a schematic diagram of the numerical model of the target site, which includes the new shield tunnel, the existing first subway line tunnel, and the existing high-speed rail line tunnel.

[0059] It should be noted that in the first model, the first subway line tunnel is excavated along the positive X-axis direction, and the high-speed rail line tunnel is excavated along the positive X-axis direction.

[0060] also, Figure 3 The different colored blocks on the right represent different strata of the target site, i.e., the material parameters of the target site, from top to bottom: miscellaneous fill, clay (plastic), gravel (slightly dense), gravel (medium dense), medium sand (medium dense), gravel (medium dense), gravel (dense), and mudstone (moderately weathered). The established numerical model also needs to incorporate the material parameters of the target site according to the actual situation to ensure the model's accuracy. The material parameters of the target site are obtained by combining field and laboratory test data and referring to relevant research results on stratigraphic parameters in adjacent areas. The main parameters of each stratum of the target site can be found in Table 1 below.

[0061] Table 1. Main parameters of the strata where the target plot is located.

[0062] In Table 1, E’ ν is the elastic modulus; ν' is Poisson's ratio; c’ ref For effective cohesion; φ' The effective internal friction angle; ψ The shear dilatation angle of the soil is determined empirically, and is generally set to 0.

[0063] This embodiment establishes a numerical model for the target site of shield tunnel construction based on the first construction parameters and structural parameters, preparing for the simulated construction of the shield tunnel on the numerical model. By using structural parameters, the existing underground structure in the numerical model is made closer to the real scene, ensuring the accuracy of the simulation results.

[0064] like Figure 1 As shown, this embodiment of the invention provides a method for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group, including the following steps: Step S300: Determine the constitutive model type based on the material parameters of the target site, and simulate the construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model.

[0065] Specifically, in one implementation of this embodiment, step S300 includes the following steps: Step S301: Obtain the material parameters of the target plot.

[0066] In this embodiment, the material parameters of the target plot are mainly the material type and corresponding parameters of the stratum where the target plot is located, as shown in Table 1, which contains the main parameters of the stratum where the target plot is located.

[0067] Step S302: Determine the constitutive model type used in the simulated construction process of the shield tunnel based on the material parameters.

[0068] In this embodiment, the selected three-dimensional geotechnical engineering finite element analysis software is Plaxis 3D. Commonly used constitutive model types in this software include: Mohr-Coulomb model, hardening soil model, and hardening soil with small strain model.

[0069] The Mohr-Coulomb model (MC model) is an ideal elastoplastic model. It typically describes soil material properties well and its parameters are easy to obtain, thus it is widely used in geotechnical engineering. This embodiment mainly involves two materials: soil and concrete. In the simulation, the soil layer is considered an elastoplastic body; therefore, the Mohr-Coulomb model is used to simulate the mechanical behavior of the soil. This model contains nine parameters. Based on the background geological survey report of the new line, the model strata are generalized, from top to bottom as follows: miscellaneous fill, clay (plastic), gravel (slightly dense), gravel (medium dense), medium sand (medium dense), gravel (medium dense), gravel (dense), and mudstone (moderately weathered). Table 1, showing the main parameters of the strata at the target site, is obtained by combining field and laboratory test data and referring to relevant research results on strata parameters in adjacent areas.

[0070] Furthermore, the tunnel boring machine (TBM) simulation employed isotropic linear elastic plate elements with an elastic modulus of 200 GPa. The concrete lining was implemented using isotropic linear elastic solid elements, with a concrete grade of C40. Considering the weakening effect of joints on stiffness, the effective stiffness ratio of the circumferential lining was set to 0.7, and the effective stiffness ratio of the longitudinal lining was set to 0.1. That is, the circumferential elastic modulus of the lining was 21.7 GPa, the longitudinal elastic modulus was 31 GPa, and the Poisson's ratio was 0.1. Interface elements were used to simulate the interaction between the TBM and the surrounding soil, and between the lining and the surrounding soil. Considering the roughness of the interface between the sand layer and the lining, the interface element strength was set to 1.0. Other material parameters for this embodiment are shown in Table 2.

[0071] Table 2 Other Material Parameters

[0072] In one implementation of this embodiment, before executing the simulated shield tunnel construction process, it is necessary to set the third construction parameters for the shield machine excavation construction of this embodiment.

[0073] Specifically, when simulating the construction process using Plaxis 3D, the tunnel geometry is divided into several construction segments along the tunnel axis. The calculation process consists of several "plastic" calculation stages, each simulating the same excavation process. Tunnel boring machines (TBMs) disturb the surrounding soil layers, causing soil deformation. This simulation uses an earth pressure balance (EPB) TBM. The typical TBM excavation process is as follows: as the TBM excavates forward, tail grouting is performed simultaneously. After completely excavating one ring, segments are assembled at the corresponding location, constituting a complete step of excavation. The TBM gradually excavates until the entire tunnel construction is completed. The 3D geotechnical engineering finite element analysis software Plaxis 3D simulates the construction process through a step-by-step excavation method, considering construction parameters such as grouting pressure, face support force, and jack thrust.

[0074] Due to the slight conical shape of the tunnel boring machine (TBM), soil-structure interaction must be added outside the tunnel. In this embodiment, each construction segment of the shield tunnel excavation is 2m long, and the head of the ultra-large diameter TBM is 12m long. The cross-sectional area of ​​the tail section of the TBM is approximately 0.1% smaller than that of the head section. The diameter reduction is achieved in the first 10m of the TBM's length. That is, the remaining 5 sections show linear contraction, and the total shrinkage rate of the TBM's head section is... The tunnel boring machine's head retraction increment This represents the incremental contraction per meter of the tunnel boring machine's (TBM) head. The negative sign only indicates direction. The TBM tunneling process is as follows: Figure 5 As shown, Figure 5 This is a schematic diagram simulating the shield tunneling process for a newly constructed railway line.

[0075] During tunnel excavation, the shield needs to propel itself forward and detach from the completed lining. This process is achieved using hydraulic jacks, so it is also necessary to install jacks on the rear side of the tunnel face with thrust in the opposite direction to the face support force. The final calculated construction parameters for shield tunnel excavation are shown in Table 3.

[0076] Table 3. Construction Parameter Values ​​for Shield Tunneling

[0077] The negative signs in Table 3 only indicate direction. Represents the stress at the top of the cross section. This represents the increase in stress per meter of depth.

[0078] Step S303: Balance the ground stress of the target plot and activate all the underground structures in the target plot.

[0079] In this embodiment, before simulating the shield tunnel construction process, it is necessary to balance the initial ground stress of the target site to ensure that the numerical model is in a "zero deformation" state before loading. The numerical model can only reflect the additional deformation caused by the subsequent shield tunnel construction simulation. If the initial ground stress is not balanced, the model will exhibit unreasonable large deformations due to the lack of initial ground stress, which does not conform to the actual situation.

[0080] After achieving the ground stress balance of the target site, it is necessary to activate the existing underground structure by freezing the soil inside the first subway line tunnel and the high-speed rail line tunnel and activating the slab units.

[0081] Step S304: Divide the simulated construction process of the shield tunnel into a preset number of construction segments, and use the constitutive model to simulate the shield tunnel construction process of each construction segment on the numerical model, thereby completing one construction simulation of all underground structures in the target plot.

[0082] In this embodiment, the simulated construction process of the shield tunnel is divided into a preset number of construction segments. The constitutive model and the third construction parameters are used to simulate the shield tunnel construction process of each construction segment on the numerical model. Excavation is carried out along the positive X-axis. First, the left line of the shield tunnel is excavated, and then the right line of the shield tunnel is excavated.

[0083] Specifically, referencing the earth pressure balance shield tunneling model, plate units are used to simulate shield segments and the shield shell, surface loads are applied to simulate grouting, and surface shrinkage is used to simulate ground loss during shield excavation. Within one cycle, the shield face pressure is set to 600 kN / m. 2 Based on 50kN / m per meter 2 The grouting pressure was increased incrementally and set to 800 kN / m. 2 Based on 50kN / m per meter 2 Increment the pressure, setting the jack pressure to 1200 kN / m. 2 The concrete grade is C40.

[0084] It should be noted that the strain field and displacement field of the model need to be reset to zero before the simulated excavation stage begins. The numerical model has 164 calculation steps, of which: steps 2 to 83 are the left line crossing of the shield tunnel; steps 84 to 165 are the right line crossing of the shield tunnel.

[0085] like Figure 6 The image shown is a simulated construction diagram of a shield tunnel passing under the first subway line tunnel and the high-speed rail line tunnel in a numerical model. Based on... Figure 6 Further obtain such as Figure 7The schematic diagram of the survey lines and feature points for the simulated construction of the shield tunnel is shown. The feature cross section of the right line of the first subway line tunnel is taken as eight feature points: bottom, top, left, right, upper left, upper right, lower right, and lower left, which are denoted as A1, B1, C1, D1, E1, F1, G1, and H1. The feature cross section of the high-speed rail line tunnel is taken as six feature points: bottom, top, upper left, upper right, lower right, and lower left, which are denoted as A3, B3, C3, D3, E3, and F3.

[0086] Furthermore, by extending the six points A1, B1, A2, B2, A3, and B3 in the negative direction of the X-axis, six survey lines are obtained, namely survey line A1, survey line B1, survey line A2, survey line B2, survey line A3, and survey line B3.

[0087] It should be noted that this step uses a constitutive model to simulate the shield tunneling process of each construction segment on a numerical model. After the construction process of all construction segments is completed, it is considered that the first construction simulation of all underground structures in the target plot has been completed, in order to distinguish it from the second construction simulation of a single underground structure in step S305.

[0088] In one implementation of this embodiment, step S300 further includes the following steps: Step S305: Select individual underground structures in the shield tunnel that have not undergone secondary construction simulation in sequence for secondary construction simulation, until all underground structures have completed secondary construction simulation.

[0089] In this embodiment, the secondary construction simulation of the underground structure is performed with a single underground structure as the object. The purpose is to simulate the impact of shield tunnel construction on the single underground structure when there is only a single underground structure and no curtain obstruction effect.

[0090] In one implementation of this embodiment, the method for secondary construction simulation includes the following steps: Step S305a: Reload the numerical model that did not simulate the construction process of the shield tunnel.

[0091] In this embodiment, the construction process of the shield tunnel in step S304 is recorded as a construction simulation. The numerical model that did not simulate the construction process of the shield tunnel is reloaded, that is, the numerical model that was reloaded before the construction simulation in step S304, but which has already completed step S303 of balancing the ground stress of the target plot and activating all the underground structures in the target plot.

[0092] It should be noted that reloading the numerical model that does not simulate the shield tunnel construction process can also be the numerical model before reloading step S303, but the numerical model needs to perform ground stress balance on the target plot before step S305b can be executed.

[0093] Step S305b: Close all the underground structures in the target plot, and reactivate the individual underground structure in the target plot; In this embodiment, all underground structures in the target plot are shut down, and a single underground structure that has not undergone secondary construction simulation is reactivated.

[0094] Step S305c: Rebalance the ground stress of the target plot, and use the constitutive model to simulate the shield tunnel construction process of each construction segment on the numerical model.

[0095] It is important to note that the model's strain field and displacement field also need to be reset to zero before the simulated excavation stage of the secondary construction simulation begins.

[0096] In this embodiment, a single construction simulation is used to simulate the shield tunnel construction process in a numerical model of the target site in a real-world scenario. This simulation reveals the impact of shield tunnel construction on the left and right subway lines of the first subway line and the high-speed rail line. The second simulation, on the other hand, simulates the construction process under ideal conditions when only a single underground structure exists in the target site. This simulation reveals the impact of shield tunnel construction on that single underground structure.

[0097] like Figure 1 As shown, this embodiment of the invention provides a method for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group, including the following steps: Step S400: Obtain cross-sectional images of each underground structure at a preset construction time, calculate the ellipticity of the cross section in each cross-sectional image, and determine whether there is a curtain-like obstruction effect between all the underground structures based on the ellipticity.

[0098] Specifically, in one implementation of this embodiment, step S400 includes the following steps: Step S401: Obtain cross-sectional images of each of the underground structures at a preset construction time.

[0099] In this embodiment, the shield tunnel is a large-diameter shield tunnel. When the shield tunnel passes under the existing underground structure, it will cause changes in the cross-section of the existing underground structure. Therefore, the cross-sectional shrinkage and deformation law of the existing underground structure can be analyzed based on the changes in the cross-section of the existing underground structure.

[0100] It should be noted that this embodiment discusses the curtain barrier effect between existing underground structures, while the high-speed rail tunnel is a single-track double-track tunnel and is far from the subway tunnel. Therefore, the cross-sectional changes of the high-speed rail tunnel are not considered in this embodiment.

[0101] In this embodiment, the cross-sections of each underground structure at preset construction times are obtained, specifically the cross-sections of the left and right subway tunnels at preset construction times, and then analyzed. In step S304, eight feature points (A1, B1, C1, D1, E1, F1, G1, and H1) are selected for the feature cross-section of the right subway tunnel of the first subway line. The times corresponding to these eight feature points are the preset construction times, and the final images obtained are the cross-sections of the right subway tunnel at these eight preset construction times. The method for obtaining the feature cross-sections, feature points, and cross-sections of the left subway tunnel is the same as that for the right subway tunnel.

[0102] Step S402: Based on the cross-sectional image and structural parameters of the underground structure, draw a cross-sectional relative deformation diagram.

[0103] In this embodiment, based on the structural parameters of the existing underground structure, its initial cross-section is selected as the solid line cross-section of the cross-section relative deformation diagram, while the cross-sections at the eight preset construction times in step S401 are selected as the dashed line cross-sections of the cross-section relative deformation diagram. The cross-section relative deformation diagram is then drawn based on the solid line cross-section and the dashed line cross-section.

[0104] In this embodiment, the deformation of the cross section is the result of displacement in the Y-axis direction and the Z-axis direction.

[0105] It should be noted that the actual deformation of the cross-section after construction is relatively small, making it difficult to visually represent the change relative to the initial cross-section. Therefore, this embodiment magnifies the deformation by 1000 times to visually represent the relative change of the cross-section, ultimately yielding the following result: Figure 8 , Figure 9 The diagram shown is a cross-sectional diagram of the relative deformation of the existing first subway line tunnel, in which... Figure 8 This diagram shows the relative deformation of the cross-section of the right-line tunnel of the subway. Figure 9 This diagram shows the relative deformation of the cross-section of the left-line tunnel of the subway.

[0106] Step S403: Calculate the ellipticity of the cross section in each cross section image based on the cross section relative deformation diagram.

[0107] like Figure 10 The diagram shows the parameter identification for ellipticity calculation. By drawing a relative deformation diagram of the cross-section, the parameters of cross-sectional changes, such as the major axis b and the minor axis a, can be obtained. In this embodiment, the ellipticity... The ratio of the minor axis b to the major axis a of the ellipse is used to represent the ductility and flatness of the ellipse. The flatter and narrower the cross-sectional shape, the smaller the value. The formula for calculating the ellipticity is as follows: .

[0108] In one implementation of this embodiment, step S400 further includes the following steps: Step S404: Select the first underground structure from all the underground structures according to the preset rules to perform the judgment on the existence of the curtain blocking effect.

[0109] Step S405: Sequentially obtain the ellipticity of the cross-section of the first underground structure at all preset construction times during the first and second construction simulations.

[0110] Step S406: If the ellipticity of the first underground structure at any construction time in a single construction simulation is greater than the ellipticity of the first underground structure at the same construction time in a second construction simulation, then the first underground structure is identified as an underground structure with a curtain-like barrier effect.

[0111] Step S407: Based on the structural parameters of the underground structure, a second underground structure corresponding to the first underground structure is obtained. If the second underground structure is an underground structure with a curtain barrier effect, it is determined that there is a curtain barrier effect between the first underground structure and the second underground structure.

[0112] In this embodiment, a second underground structure corresponding to the first underground structure is obtained based on the structural parameters of the underground structure. Specifically, an existing underground structure that is close to or parallel to the first underground structure is identified, that is, an existing underground structure that may have a curtain-like barrier effect with the first underground structure, and this is taken as the second underground structure.

[0113] Furthermore, based on the method for determining the curtain barrier effect between the first and second underground structures, it can be determined whether a curtain barrier effect exists between all underground structures.

[0114] In addition to calculating the rate of change of the cross-section, by extracting the major and minor axes of the cross-section at each preset construction time of the first subway line tunnel, the change in ellipticity following the tunnel excavation process can be calculated. Based on this, the following diagram can be drawn: Figure 11 The diagram shows the curve of the cross-sectional ellipticity variation of the tunnel of the first subway line.

[0115] like Figure 11As shown, the ellipticity of both the left and right subway tunnels decreased. Specifically, the ellipticity decreased significantly between T1 and T2. The ellipticity of the right tunnel stabilized between T2 and T5, while the ellipticity of the left tunnel continued to decrease slightly between T2 and T3, stabilizing between T3 and T5. The ellipticity of the cross-section of both subway tunnels decreased rapidly between T5 and T7. The ellipticity of the right tunnel showed no significant change between T7 and T10. The ellipticity of the left tunnel continued to decrease between T7 and T8, stabilizing between T8 and T10. The lowest ellipticity reached 0.63 for the left tunnel and 0.60 for the right tunnel. It can be seen that the ellipticity decreased rapidly when the shield tunnel approached and crossed the first subway line between T1 and T2 and between T5 and T7, while it remained almost unchanged when moving away from the first subway line.

[0116] To further verify the curtain blocking effect, the secondary construction simulation method described in step S305 was used to conduct secondary construction simulations for the left and right subway tunnels, respectively. The calculated ellipticity variation curves are shown below. Figure 11 As shown by the blue dashed line.

[0117] Figure 11 The blue dashed line indicates that the ellipticity decreases significantly between time points T1 and T2 when only the left and right subway tunnels are present, dropping from 0.86 to 0.76, which is 0.02 lower than the ellipticity of the right tunnel when both tunnels are present. The ellipticity remains stable between time points T2 and T5, but decreases from 0.76 to 0.58 between T5 and T57, with no significant change between T7 and T10. Overall, the calculation curve for only the left and right subway tunnels remains below the curve for when both tunnels are present. The lowest ellipticity of the cross-section of the left and right subway tunnels reaches 0.57, while the lowest ellipticity with both tunnels present is 0.60.

[0118] It can be concluded that the existence of the double-track tunnel increases the ellipticity of the subway tunnel cross section, with the right-line tunnel increasing by 0.03 and the left-line tunnel increasing by 0.06. This indicates that the interaction between the tunnel groups reduces the effect of the shield tunnel passing under the new line, i.e., there is a curtain barrier effect, specifically between the left-line and right-line subway tunnels.

[0119] The above text shows that there is a curtain barrier effect between the left and right subway tunnels. At the same time, it can be seen from the figure that the ellipticity of the right subway tunnel is always lower than that of the left tunnel. It can be concluded that if you pass through the right subway tunnel first and then the left subway tunnel, the right subway tunnel will play a certain role in controlling the cross-sectional ellipticity of the left subway tunnel.

[0120] like Figure 1 As shown, this embodiment of the invention provides a method for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group, including the following steps: Step S500: Calculate and output the curtain barrier effect coefficient between underground structures that have a curtain barrier effect based on the ellipticity.

[0121] Specifically, in one implementation of this embodiment, step S500 includes the following steps: Step S501: Select the third underground structure, wherein there is a curtain barrier effect between the third underground structure and the fourth underground structure; In this embodiment, the third and fourth underground structures are only used to distinguish them from the first and second underground structures mentioned above. When there is a curtain-like barrier effect between the first and second underground structures, the third underground structure can be either the first or the second underground structure, and the fourth underground structure is the other one. Alternatively, the third and fourth underground structures, along with the first and second underground structures, can be considered as distinguishing states for determining whether an existing underground structure has a curtain-like barrier effect. When a curtain-like barrier effect exists, the third and fourth underground structures are used to name the underground structure with the curtain-like barrier effect.

[0122] Step S502: Obtain the first ellipticity, which is defined as the average of the minimum ellipticities of the third underground structure and the fourth underground structure at a preset construction time when all the underground structures in the target plot are activated. In this embodiment, the first ellipticity is defined as the average of the minimum ellipticities of the third and fourth underground structures, which have a curtain-like blocking effect, at a preset construction time after a construction simulation is performed on the numerical model when all underground structures are activated.

[0123] In this embodiment, the first ellipticity is the average of the minimum ellipticities of the left-line and right-line subway tunnels, i.e. Figure 11 The average value of the ellipticity corresponding to the lowest point of the solid line at all preset times is given by the two black solid lines. The minimum ellipticity of the left subway tunnel is 0.63, and the minimum ellipticity of the right subway tunnel is 0.60. Therefore, the first ellipticity is calculated to be 0.615.

[0124] Step S503: Obtain the second ellipticity, which is defined as the minimum ellipticity of the third underground structure at a preset construction time when only the third underground structure is activated in the target plot. In this embodiment, the second ellipticity is defined as the minimum value of the ellipticity of the third or fourth underground structure in the current secondary construction simulation at all preset construction times after the numerical model has undergone secondary construction simulation.

[0125] In this embodiment, the second ellipticity is the minimum value of the ellipticity of the left-line or right-line subway tunnel, i.e. Figure 11 The ellipticity corresponding to the lowest point of the blue dashed line at all preset times is 0.57 in this embodiment, which is the minimum ellipticity of either the left or right subway tunnel.

[0126] Step S504: Calculate and output the curtain blocking effect coefficient based on the first ellipticity and the second ellipticity. ; in, This is the curtain blocking effect coefficient. The first ellipticity, This is the second ellipticity.

[0127] In this embodiment, the curtain blocking effect coefficient The meaning is: a parameter used to evaluate the degree to which the curtain barrier effect increases the ellipticity of existing underground structures.

[0128] In this embodiment, according to Figure 11 The curtain blocking effect coefficient between the left and right subway tunnels was calculated from the data. It is 7.89%.

[0129] In this embodiment, by obtaining the cross-section of each underground structure at a preset construction time, drawing a relative deformation diagram of the cross-section, and calculating the ellipticity of each cross-section, it is possible to determine whether there is a curtain-like barrier effect between existing underground structures based on the change in ellipticity, and then using the curtain-like barrier effect coefficient. Quantifying the curtain barrier effect makes the quantified curtain barrier effect between existing underground structures more intuitive, and also provides theoretical and data support for improving the construction of shield tunnels for new railway lines based on the curtain barrier effect.

[0130] This embodiment achieves the following technical effects through the above technical solution: This embodiment establishes a numerical model of the target site based on the first construction parameters of the shield tunnel. By simulating the construction process of the shield tunnel, the cross-section of the existing underground structure group at the preset construction time is obtained. This enables the determination of whether there is a curtain barrier effect between the existing underground structures. A calculation method for the curtain barrier effect between multiple existing tunnels is also provided by calculating the ellipticity, which can provide a reference for actual construction and facilitate the rational planning of the ultra-large diameter shield tunnel construction scheme for the target site. When the shield tunnel passes under the existing underground structure group, the curtain barrier effect can also be utilized and quantified by the curtain barrier effect coefficient to minimize the impact of shield tunnel construction on the existing underground structure group, thereby achieving full protection of the existing underground structure group.

[0131] Exemplary device Based on the above embodiments, the present invention also provides a curtain barrier effect detection system for shield tunnels passing under underground structure groups, comprising: The parameter acquisition module acquires the first construction parameters of the shield tunnel and the structural parameters of the underground structure. The model building module is used to construct a numerical model of the target site based on the first construction parameters and the structural parameters; wherein, the target site is the target site for shield tunnel construction; The construction simulation module is used to determine the constitutive model type based on the material parameters of the target site, and to simulate the construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model. The curtain barrier effect judgment module is used to acquire cross-sectional images of each underground structure at a preset construction time, calculate the ellipticity of the cross section in each cross-sectional image, and determine whether there is a curtain barrier effect between all the underground structures based on the ellipticity. The curtain barrier effect calculation module is used to calculate and output the curtain barrier effect coefficient between underground structures that have a curtain barrier effect based on the ellipticity.

[0132] This embodiment achieves the following technical effects through the above technical solution: This embodiment employs an autoencoder to extract time-invariant features from images of different time phases within a single modality, reducing interference from temporal variations and enhancing cross-temporal feature consistency. Furthermore, it utilizes geographic index information to construct a contrastive learning task, enhancing spatially invariant feature representation and improving cross-modal feature alignment accuracy. It also introduces bottleneck attention to dynamically evaluate the importance of each modality, adjust fusion weights, strengthen the contribution of key modalities, and improve feature fusion robustness. This embodiment fully considers the spatiotemporal invariant features and importance of each modality, achieving adaptive multimodal remote sensing image feature-level fusion and improving the fusion accuracy of multimodal remote sensing image features.

[0133] Based on the above embodiments, the present invention also provides a terminal, the principle block diagram of which can be as follows: Figure 12 As shown.

[0134] The terminal includes: a processor, a memory, an interface, a display screen, and a communication module connected via a system bus; wherein, the processor of the terminal provides computing and control capabilities; the memory of the terminal includes a computer-readable storage medium and internal memory; the computer-readable storage medium stores an operating system and computer programs; the internal memory provides an environment for the operation of the operating system and computer programs in the computer-readable storage medium; the interface is used to connect to external devices; the display screen is used to display relevant information; and the communication module is used to communicate with a cloud server or other devices.

[0135] When executed by a processor, this computer program is used to implement a method for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group.

[0136] In one embodiment, a terminal is provided, comprising: a processor and a memory, the memory storing a program for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group, the program being executed by the processor to implement the operation of the above-described method for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group.

[0137] In one embodiment, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a curtain obstruction effect detection program for a shield tunnel passing under an underground structure group, the curtain obstruction effect detection program for a shield tunnel passing under an underground structure group being executed by a processor to implement the operation of the above-described method for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group.

[0138] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, database, or other media used in the embodiments provided by this invention can include both non-volatile and volatile memory.

[0139] In summary, this invention provides a method, system, terminal, and storage medium for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group. The method includes: acquiring first construction parameters of the shield tunnel and structural parameters of the underground structures; constructing a numerical model of a target site based on the first construction parameters and the structural parameters, wherein the target site is the target site for shield tunnel construction; determining the constitutive model type based on the material parameters of the target site, and simulating the construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model; acquiring cross-sectional images of each underground structure at a preset construction time, calculating the ellipticity of the cross-section in each cross-sectional image, and determining whether a curtain barrier effect exists between all the underground structures based on the ellipticity; calculating and outputting the curtain barrier effect coefficient between underground structures exhibiting a curtain barrier effect based on the ellipticity. This invention can determine whether a curtain barrier effect exists between existing underground structures and can quantify the curtain barrier effect through the curtain barrier effect coefficient.

[0140] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A method for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group, characterized in that, The underground structure group includes at least two underground structures, and the method for detecting the curtain barrier effect of the shield tunnel passing under the underground structure group includes: Obtain the first construction parameters of the shield tunnel and the structural parameters of the underground structure; Based on the first construction parameters and the structural parameters, a numerical model of the target site is constructed; wherein, the target site is the target site for shield tunnel construction; The constitutive model type is determined based on the material parameters of the target site, and the construction process of the shield tunnel is simulated in the numerical model based on the first construction parameters and the constitutive model. Obtain cross-sectional images of each underground structure at a preset construction time, calculate the ellipticity of the cross section in each cross-sectional image, and determine whether there is a curtain-like obstruction effect between all the underground structures based on the ellipticity. Based on the ellipticity, calculate and output the curtain barrier effect coefficient between underground structures that exhibit a curtain barrier effect.

2. The method for detecting the curtain-like obstruction effect of a shield tunnel passing under an underground structure group according to claim 1, characterized in that, The step of constructing a numerical model of the target site based on the first construction parameters and the structural parameters includes: Based on the first construction parameters, the boundary parameters of the target plot are determined, and a first model of the target plot is established based on the boundary parameters. Based on the structural parameters, determine the second construction parameters and location parameters of the underground structure; The underground structure is added to the first model based on the second construction parameters and the location parameters to obtain the numerical model of the target plot.

3. The method for detecting the curtain barrier effect of a shield tunnel passing under an underground structure group according to claim 1, characterized in that, The step of determining the constitutive model type based on the material parameters of the target site, and simulating the construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model, includes: Obtain the material parameters of the target plot; The constitutive model type used in the simulation construction process of the shield tunnel is determined based on the material parameters. The ground stress of the target plot is balanced, and all the underground structures in the target plot are activated; The simulated construction process of the shield tunnel is divided into a preset number of construction segments. The constitutive model is used to simulate the shield tunnel construction process of each construction segment on the numerical model, thereby completing a construction simulation of all underground structures in the target plot.

4. The method for detecting the curtain-like barrier effect of a shield tunnel passing under an underground structure group according to claim 3, characterized in that, The step of determining the constitutive model type based on the material parameters of the target site and simulating the construction process of the shield tunnel based on the first construction parameters and the constitutive model further includes: sequentially selecting individual underground structures in the shield tunnel that have not undergone secondary construction simulation for secondary construction simulation, until all underground structures have completed secondary construction simulation; The method for secondary construction simulation includes: Reload the numerical model that does not simulate the construction process of the shield tunnel; Close all underground structures in the target plot, and then reactivate a single underground structure in the target plot; The ground stress of the target plot is rebalanced, and the constitutive model is used to simulate the shield tunnel construction process of each construction segment on the numerical model.

5. The method for detecting the curtain barrier effect of a shield tunnel passing under an underground structure group according to claim 4, characterized in that, The step of acquiring cross-sectional images of each underground structure at a preset construction time and calculating the ellipticity of the cross-section in each cross-sectional image includes: Obtain cross-sectional images of each of the underground structures at a preset construction time; Based on the cross-sectional images and structural parameters of the underground structure, a diagram of relative deformation of the cross-section is drawn. Based on the relative deformation diagram of the cross-section, the ellipticity of the cross-section in each cross-section image is calculated.

6. The method for detecting the curtain-like obstruction effect of a shield tunnel passing under an underground structure group according to claim 4, characterized in that, The step of determining whether a curtain-like barrier effect exists between all the underground structures based on the ellipticity includes: Select the first underground structure from all the underground structures according to the preset rules; The ellipticity of the cross section of the first underground structure at all preset construction times in the first and second construction simulations is obtained sequentially. If the ellipticity of the first underground structure at any construction time in a single construction simulation is greater than the ellipticity of the first underground structure at the same construction time in a second construction simulation, then the first underground structure is considered to be an underground structure with a curtain-like barrier effect. Based on the structural parameters of the underground structure, a second underground structure corresponding to the first underground structure is obtained. If the second underground structure is an underground structure with a curtain barrier effect, then it is determined that there is a curtain barrier effect between the first underground structure and the second underground structure.

7. The method for detecting the curtain barrier effect of a shield tunnel passing under an underground structure group according to claim 1, characterized in that, The step of calculating and outputting the curtain-blocking effect coefficient between underground structures exhibiting a curtain-blocking effect based on the ellipticity includes: A third underground structure is selected, and there is a curtain-like barrier effect between the third underground structure and the fourth underground structure. Obtain a first ellipticity, which is defined as the average of the minimum ellipticities of the third underground structure and the fourth underground structure at a preset construction time when all the underground structures in the target plot are activated. Obtain the second ellipticity, which is defined as the minimum ellipticity of the third underground structure at a preset construction time when only the third underground structure is activated in the target plot. The curtain blocking effect coefficient is calculated and output based on the first ellipticity and the second ellipticity: ； in, This is the curtain blocking effect coefficient. The first ellipticity, This is the second ellipticity.

8. A system for detecting the curtain barrier effect of a shield tunnel passing under an underground structure group, characterized in that, include: The parameter acquisition module acquires the first construction parameters of the shield tunnel and the structural parameters of the underground structure. The model building module is used to construct a numerical model of the target site based on the first construction parameters and the structural parameters; wherein, the target site is the target site for shield tunnel construction; The construction simulation module is used to determine the constitutive model type based on the material parameters of the target site, and to simulate the construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model. The curtain barrier effect judgment module is used to acquire cross-sectional images of each underground structure at a preset construction time, calculate the ellipticity of the cross section in each cross-sectional image, and determine whether there is a curtain barrier effect between all the underground structures based on the ellipticity. The curtain barrier effect calculation module is used to calculate and output the curtain barrier effect coefficient between underground structures that have a curtain barrier effect based on the ellipticity.

9. A terminal, characterized in that, include: The processor and memory, wherein the memory stores a program for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group, and the program for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group is executed by the processor to implement the operation of the method for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a curtain obstruction effect detection program for shield tunnels passing under underground structure groups. When the processor executes the curtain obstruction effect detection program for shield tunnels passing under underground structure groups, it is used to implement the operation of the curtain obstruction effect detection method for shield tunnels passing under underground structure groups as described in any one of claims 1-7.

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