Analysis Method and System for Foundation Pit Support Structure Based on Collision Simulation

Abstract

The present invention discloses a method and system for analyzing the foundation pit support structure based on collision simulation, which relates to the technical field of foundation pit support structure analysis. It conducts on-site investigation, performs three-dimensional scanning on the foundation pit support structure to obtain three-dimensional scanning data of the foundation pit support structure and component material properties, samples and analyzes the soil layer in a set area of the connection part between the foundation pit support structure and the foundation pit, and obtains the soil layer distribution and soil physical and mechanical parameters; a simulation model is established, and according to the three-dimensional scanning data of the foundation pit support structure obtained from on-site investigation, a geometric model of the foundation pit support structure is established using computer-aided design software. The present invention creatively samples and analyzes the soil layer in a set area of the connection part between the foundation pit support structure and the foundation pit to obtain the soil layer distribution and soil physical and mechanical parameters, providing parameters for the subsequent model of the soil layer model associated with the contact part. The random lateral collision simulation can simulate situations such as accidental contact of engineering equipment, making the collision simulation more truly reflect the actual engineering situation.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support structure analysis, and particularly to a method and system for analyzing foundation pit support structures based on collision simulation. Background Art

[0002] Collision simulation and data analysis of foundation pit support structures are important research contents in the field of civil engineering, mainly involving multiple aspects such as structural mechanics, material mechanics, soil mechanics, and numerical simulation. This process generally includes the following steps:

[0003] Model establishment: Use computer-aided design software to establish a geometric model of the foundation pit support structure.

[0004] Parameter setting: Set the property parameters of various materials in the model.

[0005] Collision simulation: Use finite element analysis software (such as ABAQUS, ANSYS, etc.) to perform collision simulation. This may involve non-linear dynamics problems and appropriate algorithms need to be used to handle large deformations and contact problems.

[0006] Data analysis: After the simulation is completed, the results need to be analyzed in detail. This includes the displacement, stress, and strain distributions of the structure, as well as the energy changes during the collision process. Through these data, the stability and safety of the structure can be evaluated.

[0007] Currently, traditional collision simulations generally only consider the interaction between structural components themselves, do not consider the relevant parameters of the foundation soil where the foundation pit is located, and the collision simulation is mainly based on the collision of set key points, unable to simulate the situation where the actual foundation pit support structure is collided, and cannot truly reflect the deformation of the foundation pit support structure under collision. Summary of the Invention

[0008] In order to solve the above technical problems of computer collision simulation analysis of foundation pit support structures, the present invention provides a method and system for analyzing foundation pit support structures based on collision simulation. The following technical solutions are adopted:

[0009] A method for analyzing a foundation pit support structure based on collision simulation includes the following steps:

[0010] Step 1, conduct on-site investigation, perform three-dimensional scanning on the foundation pit support structure to obtain three-dimensional scanning data of the foundation pit support structure and component material properties, sample and analyze the soil layer in a set area at the connection part between the foundation pit support structure and the foundation pit, and obtain the soil layer distribution and physical and mechanical parameters of the soil layer;

[0011] Step 2: Establish a simulation model. Based on the three-dimensional scanning data of the foundation pit support structure obtained from on-site investigation, use computer-aided design software to establish a geometric model of the foundation pit support structure; the geometric model also includes an associated soil layer model for the contact part.

[0012] Step 3: Set parameters. Set the property parameters of the materials used for the support pile model, anchor rod model, and support beam model in the model, and set the parameters of the associated soil layer model for the contact part.

[0013] Step 4: Collision simulation. Use finite element analysis software to conduct collision simulation.

[0014] The collision simulation includes random drop collision simulation and random lateral collision simulation.

[0015] Set key displacement monitoring points, and record the displacement data of the key displacement monitoring points after each collision simulation respectively.

[0016] Step 5: Data analysis. Conduct collision simulation analysis based on the displacement data of the key monitoring points, and output the collision simulation analysis result of the foundation pit support structure based on the comparison result of the displacement threshold.

[0017] By adopting the above technical solution, different from the defect of the fine model in traditional finite element analysis which is drawn based on design drawings and has a large deviation from the actual situation, through on-site investigation, the three-dimensional scanning data of the foundation pit support structure can be obtained by means of UAV three-dimensional scanning, and then the specific material parameters of each part can be obtained on-site.

[0018] Creatively sample and analyze the soil layer in the set area of the connection part between the foundation pit support structure and the foundation pit to obtain the soil layer distribution and soil physical and mechanical parameters, which provide parameters for the subsequent associated soil layer model of the contact part. In the collision simulation, not only consider the foundation pit support structure itself, but also consider the soil stress analysis of the contact parts with the bottom and side, so that the analysis result can be closer to the actual situation.

[0019] The collision simulation includes random drop collision simulation and random lateral collision simulation, both of which are realized by randomly generating drop collision points and lateral collision points for collision simulation.

[0020] The random drop collision simulation can simulate random falling objects in engineering, such as unknown stones, unknown utensils, etc., and the random lateral collision simulation can simulate situations such as accidental contact of engineering instruments.

[0021] Make the collision simulation more truly reflect the actual engineering situation.

[0022] Optionally, in Step 2, the geometric model includes a support pile model, an anchor rod model, and a support beam model.

[0023] The associated soil layer model is obtained by magnifying the contact parts between the retaining pile model, the anchor rod model, the support beam model and the soil layers on the foundation pit side and at the bottom. Let the outer contour dimensions of the contact part be a×b×c, where a is the long side dimension, b is the wide side dimension, and c is the depth dimension. Then the outer contour of the associated soil layer model of the contact part is a cuboid, and the cuboid dimensions are A×B×C. The outer contour cuboid dimensions of the associated soil layer model of the contact part are calculated based on the outer contour dimensions of the contact part.

[0024] By adopting the above technical solution, the dimensions of the contact parts between each model and the soil layers on the foundation pit side and at the bottom are determined according to the actual situation. For example, if the embedded foundation steel structure is used as the contact part, it is only necessary to confirm that the outer contour dimensions of the length, width and depth of the foundation steel structure are a×b×c. And the subsequent outer contour of the associated soil layer model of the contact part is a cuboid proportionally enlarged based on the foundation steel structure.

[0025] Optionally, the calculation method of the outer contour cuboid dimensions of the associated soil layer model of the contact part is:

[0026] A = a·α; B = b·α; C = c·β. α is the expansion coefficient affected by lateral force, and α takes values between 2 and 3. β is the expansion coefficient affected by longitudinal force, and β takes values between 1.5 and 2.

[0027] By adopting the above technical solution, the outer contour cuboid dimensions of the associated soil layer model of the contact part are calculated respectively by using the expansion coefficient affected by lateral force and the expansion coefficient affected by longitudinal force, which can fully reflect the area of the associated soil layer. For subsequent collision simulation closer to reality, the associated factors of soil stress at the contact part are added to the collision simulation, making the collision simulation results closer to the actual collision situation.

[0028] Optionally, in step 1, sampling and analysis are carried out on the soil layer area corresponding to the outer contour cuboid area of the associated soil layer model of the contact part;

[0029] The sampling and analysis are based on the soil of multiple sampling points in the soil layer area corresponding to the outer contour cuboid area of the associated soil layer model of the contact part to obtain the basic physical properties, mechanical properties, soil layer distribution and bearing capacity parameters.

[0030] Optionally, in step 3, the parameters of the associated soil layer model of the contact part are set according to the basic physical properties, mechanical properties, soil layer distribution and bearing capacity parameters of the soil obtained by the analysis in step 1.

[0031] By adopting the above technical solution, the basic physical property refers to the density (ρ): the density of the soil mass, usually in kilograms per cubic meter (kg / m 3) Representation; Mechanical properties: Angle of internal friction (φ): An index of the shear strength of soil, reflecting the frictional characteristics between soil particles; Cohesion (c): The bonding force between soil particles, which is part of the shear strength of soil; Compression modulus (Es): The compression stiffness of soil under the condition of lateral confinement, reflecting the ability of soil to resist compression deformation; Shear strength: The ability of soil to resist shear failure, usually obtained through direct shear tests or triaxial shear tests.

[0032] Soil layer distribution refers to the soil layer thickness: The vertical thickness of each soil layer; Soil layer sequence: The vertical and horizontal sequence of different soil layers.

[0033] Bearing capacity of foundation refers to Standard Penetration Test (N value): The value obtained through the Standard Penetration Test, used to evaluate the compactness and bearing capacity of soil layers.

[0034] Static Cone Penetration Test (CPT): The soil layer resistance obtained through the Static Cone Penetration Test can be used to evaluate the bearing capacity of the foundation.

[0035] These parameters are input into the finite element analysis software subsequently, and can better simulate the stress conditions of the associated soil in the collision simulation.

[0036] Optionally, in step 4, the specific method of random drop collision simulation is as follows:

[0037] Generate a simulated drop surface above the foundation pit support structure, mesh the simulated drop surface, the center point of each grid is the simulated drop point, number the simulated drop points in sequential order, and use a random number generation algorithm to randomly generate 5% of the simulated drop points for the simulated drop simulation;

[0038] The specific method of random lateral collision simulation is as follows:

[0039] Generate a simulated collision surface on the side of the foundation pit support structure, mesh the simulated collision surface, the center point of each grid is the simulated collision point, number the simulated collision points in sequential order, and use a random number generation algorithm to randomly generate 5% of the simulated collision points for the simulated drop simulation;

[0040] The displacement key monitoring points are the connection nodes of the foundation pit support structure, recording the displacement during the collision period from each simulated collision to one second after the collision and the displacement during the rebound stabilization period ten seconds after the collision.

[0041] Optionally, the weight of the dropped object in the random drop collision simulation is randomly generated between 1 kg and 100 kg; the collision force in the random lateral collision simulation is randomly generated between 100 N and 1000 N, and the initial collision velocity is randomly generated between 1 m / s and 5 m / s.

[0042] By adopting the above technical solution, the collision simulation points randomly generated by the random number generation algorithm, and the simulated collision forces are also generated by the random number generation algorithm. Compared with the predetermined collision simulation points and the set collision forces, they can more truly reflect the complex working conditions of the engineering area.

[0043] Optionally, in step 5, a maximum displacement threshold for the collision period and a maximum displacement threshold for the rebound stabilization period are set. The displacement during the collision period and the displacement during the rebound stabilization period of the displacement data of each key monitoring point are respectively compared with the maximum displacement threshold for the collision period and the maximum displacement threshold for the rebound stabilization period. If the corresponding threshold is exceeded, an unqualified collision simulation analysis result is output, and the collision simulation parameters are appended to the unqualified collision simulation analysis result.

[0044] A foundation pit support structure analysis system based on collision simulation includes a memory and a computer. The memory stores an analysis program designed by the foundation pit support structure analysis method based on collision simulation. The computer is pre-installed with computer-aided design software and finite element analysis software. The computer is communicatively connected to the memory, runs the analysis program, and associates the computer-aided design software and the finite element analysis software to automatically analyze the foundation pit support structure and output the collision simulation analysis result to be stored in the memory.

[0045] Optionally, it further includes a display. The display is communicatively connected to the computer, and the computer controls the display to display the simulation analysis process and the simulation analysis result.

[0046] By adopting the above technical solution, it is possible to realize the automatic progress of the simulation collision analysis of the foundation pit support structure, and automatically output the simulation analysis result, display the associated data and the analysis result.

[0047] In summary, the present invention includes at least one of the following beneficial technical effects: The foundation pit support structure analysis method based on collision simulation adopts on-site investigation. The three-dimensional scan data of the foundation pit support structure can be obtained by means of UAV three-dimensional scanning, and then the specific material parameters of each part are obtained on-site; creatively sample and analyze the soil layer in the set area of the connection part between the foundation pit support structure and the foundation pit to obtain the soil layer distribution and the physical and mechanical parameters of the soil layer, providing parameters for the subsequent soil layer model of the contact part association layer model. In the collision simulation, not only the foundation pit support structure itself is considered, but also the stress analysis of the soil in the contact parts with the bottom and the side is considered, so that the analysis result can be closer to the actual situation; the collision simulation includes random drop collision simulation and random lateral collision simulation, both of which are realized by randomly generated drop collision points and lateral collision points; the random drop collision simulation can simulate random falling objects in engineering, such as unknown stones, unknown utensils, etc., and the random lateral collision simulation can simulate situations such as accidental contact of engineering equipment, making the collision simulation more truly reflect the actual engineering situation.

[0048] The foundation pit support structure analysis system based on collision simulation can realize the automatic progress of the simulation collision analysis of the foundation pit support structure, and automatically output the simulation analysis results, display the associated data and analysis results. Description of the Drawings

[0049] Figure 1 is a schematic flow chart of the method for analyzing the foundation pit support structure based on collision simulation of the present invention;

[0050] Figure 2 is a schematic diagram of the architecture principle of the foundation pit support structure analysis system based on collision simulation of the present invention;

[0051] Figure 3 is a schematic diagram showing the random generation of 8 simulated collision points from 160 simulated collision points in the random drop collision simulation in step 4 of the method for analyzing the foundation pit support structure based on collision simulation of the present invention.

[0052] Description of the reference numerals: 1. Memory; 2. Computer; 3. Display. Detailed Description of the Invention

[0053] The present invention will be further described in detail below with reference to the accompanying drawings.

[0054] The embodiments of the present invention disclose a method and system for analyzing a foundation pit support structure based on collision simulation.

[0055] Refer to Figures 1-3 , Embodiment 1, a method for analyzing a foundation pit support structure based on collision simulation, includes the following steps:

[0056] Step 1, conduct on-site investigation, perform three-dimensional scanning on the foundation pit support structure to obtain three-dimensional scanning data of the foundation pit support structure and component material properties, sample and analyze the soil layer in the set area of the connection part between the foundation pit support structure and the foundation pit, and obtain the soil layer distribution and soil physical and mechanical parameters;

[0057] Step 2, establish a simulation model. According to the three-dimensional scanning data of the foundation pit support structure obtained from the on-site investigation, use computer-aided design software to establish a geometric model of the foundation pit support structure; the geometric model also includes an associated soil layer model at the contact part;

[0058] Step 3, set parameters: set the property parameters of the materials used in the support pile model, anchor model, and support beam model in the model, and set the parameters of the associated soil layer model at the contact part;

[0059] Step 4, collision simulation, use finite element analysis software to perform collision simulation;

[0060] The collision simulation includes random drop collision simulation and random lateral collision simulation;

[0061] Set displacement key monitoring points, and record the displacement data of the displacement key monitoring points after each collision simulation respectively;

[0062] Step 5, data analysis. Conduct collision simulation analysis based on the displacement data of the key monitoring points, and output the collision simulation analysis results of the foundation pit support structure based on the comparison results of the displacement thresholds.

[0063] To address the defect of the large deviation from the actual situation caused by the precise model in traditional finite element analysis being drawn based on design drawings, field surveys can be carried out. The three-dimensional scanning data of the foundation pit support structure can be obtained by means of UAV three-dimensional scanning, and then the specific material parameters of each part can be obtained on-site;

[0064] Creatively sample and analyze the soil layer in the set area at the connection part between the foundation pit support structure and the foundation pit to obtain the soil layer distribution and the physical and mechanical parameters of the soil layer, providing parameters for the subsequent soil layer model associated with the contact part. In the collision simulation, not only the foundation pit support structure itself needs to be considered, but also the stress analysis of the soil in the contact parts with the bottom and the side needs to be considered, so that the analysis results can be closer to the actual situation.

[0065] The collision simulation includes random drop collision simulation and random lateral collision simulation, both of which are implemented by randomly generating drop collision points and lateral collision points;

[0066] The random drop collision simulation can simulate random falling objects in the project, such as unknown stones, unknown utensils, etc., and the random lateral collision simulation can simulate situations such as accidental touches of engineering instruments.

[0067] Make the collision simulation more truly reflect the actual situation of the project.

[0068] In Example 2, the geometric model in Step 2 includes a support pile model, an anchor rod model, and a support beam model;

[0069] The associated soil layer model is obtained by magnifying the contact parts between the support pile model, the anchor rod model, the support beam model and the soil layer on the side and at the bottom of the foundation pit. Let the outer contour size of the contact part be a×b×c, where a is the long side size, b is the wide side size, and c is the depth size. Then the outer contour of the associated soil layer model of the contact part is a cuboid, and the cuboid size is A×B×C. The outer contour cuboid size of the associated soil layer model of the contact part is calculated based on the outer contour size of the contact part.

[0070] The size determination of the contact parts between each model and the soil layer on the side and at the bottom of the foundation pit is based on the actual situation. For example, if the embedded foundation steel structure is used as the contact part, it is only necessary to confirm that the outer contour size of the length, width and depth of the foundation steel structure is a×b×c, and the outer contour of the subsequent associated soil layer model of the contact part is a cuboid proportionally enlarged based on the foundation steel structure.

[0071] Example 3. The calculation method for the dimensions of the cuboid of the outer contour of the soil layer model associated with the contact part is as follows:

[0072] A = a·α; B = b·α; C = c·β. α is the expansion coefficient affected by lateral force, and α takes values between 2 and 3. β is the expansion coefficient affected by longitudinal force, and β takes values between 1.5 and 2.

[0073] Using the expansion coefficient affected by lateral force and the expansion coefficient affected by longitudinal force to calculate the dimensions of the cuboid of the outer contour of the soil layer model associated with the contact part can fully reflect the area of the associated soil layer. For subsequent collision simulations that are closer to reality, the associated factors of soil force at the contact part are added to the collision simulation, making the collision simulation results closer to the actual collision situation.

[0074] Example 4. In step 1, sampling and analysis are carried out on the soil layer area corresponding to the cuboid area of the outer contour of the soil layer model associated with the contact part;

[0075] The sampling and analysis are based on the soil at multiple sampling points in the soil layer area corresponding to the cuboid area of the outer contour of the soil layer model associated with the contact part, and the basic physical properties, mechanical properties, soil layer distribution, and bearing capacity parameters are obtained.

[0076] Example 5. In step 3, according to the basic physical properties, mechanical properties, soil layer distribution, and bearing capacity parameters of the soil obtained from the analysis in step 1, the parameters of the soil layer model associated with the contact part are set.

[0077] The basic physical property refers to the density (ρ): the density of the soil mass, usually expressed in kilograms per cubic meter (kg / m 3 )). Mechanical properties: The angle of internal friction (φ): an index of the shear strength of the soil mass, reflecting the frictional characteristics between soil particles; Cohesion (c): the bonding force between soil particles, which is part of the shear strength of the soil mass; Compression modulus (Es): the compression stiffness of the soil mass under the condition of lateral confinement, reflecting the ability of the soil mass to resist compression deformation; Shear strength: the ability of the soil mass to resist shear failure, usually obtained through direct shear tests or triaxial shear tests.

[0078] The soil layer distribution refers to the soil layer thickness: the vertical thickness of each soil layer; The soil layer sequence: the vertical and horizontal distribution order of different soil layers;

[0079] The foundation bearing capacity refers to the standard penetration test (N value): the value obtained through the standard penetration test, used to evaluate the density and bearing capacity of the soil layer;

[0080] Static cone penetration test (CPT): The soil layer resistance obtained through the static cone penetration test can be used to evaluate the foundation bearing capacity.

[0081] These parameters, when input into the finite element analysis software subsequently, can better simulate the force conditions of the associated soil in the collision simulation.

[0082] In Example 6, in step 4, the specific method of random drop collision simulation is as follows:

[0083] Simulate and generate a simulated drop surface above the foundation pit support structure, mesh the simulated drop surface, the center point of each grid is a simulated drop point, number the simulated drop points in sequential order, and use a random number generation algorithm to randomly generate 5% of the simulated drop points for drop simulation;

[0084] The specific method of random lateral collision simulation is as follows:

[0085] Simulate and generate a simulated collision surface on the side of the foundation pit support structure, mesh the simulated collision surface, the center point of each grid is a simulated collision point, number the simulated collision points in sequential order, and use a random number generation algorithm to randomly generate 5% of the simulated collision points for drop simulation;

[0086] The key displacement monitoring points are the connection nodes of the foundation pit support structure, and record the displacement during the collision period from each simulated collision to one second after the collision and the displacement during the rebound stabilization period ten seconds after the collision.

[0087] In Example 7, the weight of the dropped object in the random drop collision simulation is randomly generated from 1 kg to 100 kg; the collision force in the random lateral collision simulation is randomly generated between 100 N and 1000 N, and the initial collision speed is randomly generated between 1 m / s and 5 m / s.

[0088] For the collision simulation points randomly generated by the random number generation algorithm, the simulated collision force is also generated by the random number generation algorithm, which can more realistically reflect the complex working conditions of the engineering area compared with the predetermined collision simulation points and the set collision force.

[0089] The following introduces a code example for randomly selecting 5 simulated collision points from 1 to 100 simulated collision points:

[0090] To generate 5 random numbers between 1 and 100 and add a chaos factor, use the random module in Python to generate basic random numbers and combine the Logistic map to introduce the chaos factor. The following is an example code:

[0091]

[0092]

[0093] In Example 8, in step 5, set the maximum displacement threshold during the collision period and the maximum displacement threshold during the rebound stabilization period. Compare the displacement during the collision period and the displacement during the rebound stabilization period of the displacement data at each key monitoring point with the maximum displacement threshold during the collision period and the maximum displacement threshold during the rebound stabilization period respectively. Output the simulation analysis result of failed collision if it exceeds the corresponding threshold, and append the collision simulation parameters to the simulation analysis result of failed collision.

[0094] Example 9. The foundation pit support structure analysis system based on collision simulation includes a memory 1 and a computer 2. The memory 1 stores an analysis program designed by using the foundation pit support structure analysis method based on collision simulation. The computer 2 is pre-installed with computer-aided design software and finite element analysis software. The computer 2 is communicatively connected to the memory 1, runs the analysis program, and associates the computer-aided design software and the finite element analysis software to automatically analyze the foundation pit support structure, and output the collision simulation analysis result and store it in the memory 1.

[0095] Example 10. It further includes a display 3. The display 3 is communicatively connected to the computer 2. The computer 2 controls the display 3 to display the simulation analysis process and the simulation analysis result.

[0096] It can realize the automatic progress of the simulation collision analysis of the foundation pit support structure, and automatically output the simulation analysis result, display the associated data and the analysis result.

[0097] The above are all the preferred embodiments of the present invention, and do not limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. The foundation pit support structure analysis method based on collision simulation is characterized by: The following steps are involved: Step 1: Conduct a field survey, perform a three-dimensional scan on the foundation pit support structure to obtain the three-dimensional scanning data of the foundation pit support structure and the material properties of the components, and perform sampling and analysis on the soil layer in the set area where the foundation pit support structure and the foundation pit are connected to obtain the soil layer distribution and the physical and mechanical parameters of the soil layer; Step 2, establishing a simulation model, using computer-aided design software to establish a geometric model of the foundation pit support structure based on the three-dimensional scanning data of the foundation pit support structure obtained from the field survey; the geometric model also includes a soil layer model associated with the contact part; Step 3, setting parameters: setting the material attribute parameters of the support pile model, anchor rod model, and support beam model in the model, and setting the soil layer model parameters associated with the contact part; Step 4: collision simulation, using finite element analysis software to perform collision simulation; The collision simulation includes random falling collision simulation and random side collision simulation; Set key displacement monitoring points, and record displacement data of the key displacement monitoring points after each collision simulation; Step 5, data analysis, performs collision simulation analysis based on the displacement data of key monitoring points, and outputs the collision simulation analysis results of the foundation pit support structure based on the displacement threshold comparison results.

2. The method for analyzing foundation pit support structure based on collision simulation according to claim 1 is characterized in that: The geometric model in step 2 includes a support pile model, an anchor rod model, and a support beam model; The associated soil layer model is obtained by enlarging the contact parts of the supporting pile model, anchor rod model, support beam model and the side soil layer and bottom soil layer of the foundation pit. Assuming the outer contour size of the contact part is a×b×c, where a is the long side size, b is the wide side size, and c is the depth size, the outer contour of the associated soil layer model of the contact part is a cuboid with a size of A×B×C. The size of the outer contour cuboid of the associated soil layer model of the contact part is calculated based on the outer contour size of the contact part.

3. The method for analyzing foundation pit support structure based on collision simulation according to claim 2 is characterized in that: The calculation method of the outer contour cuboid size of the contact part associated soil layer model is: ； α is the expansion coefficient affected by lateral force, and α is between 2 and 3. is the expansion coefficient affected by the longitudinal force, The value is between 1.5 and 2.

4. The method for analyzing foundation pit support structure based on collision simulation according to claim 3 is characterized in that: In step 1, the soil layer area corresponding to the outer contour rectangular area of ​​the soil layer model associated with the contact position is used for sampling and analysis; The sampling analysis is based on the soil at multiple sampling points in the soil layer area corresponding to the outer contour rectangular area of ​​the soil layer model associated with the contact position, and the basic physical properties, mechanical properties, soil layer distribution and bearing capacity parameters are obtained.

5. The method for analyzing foundation pit support structure based on collision simulation according to claim 4 is characterized in that: In step 3, the contact part associated soil layer model parameters are set according to the soil basic physical properties, mechanical properties, soil layer distribution and bearing capacity parameters obtained by sampling and analysis in step 1.

6. The method for analyzing foundation pit support structure based on collision simulation according to claim 5 is characterized in that: In step 4, the specific method of random drop collision simulation is: A simulated drop surface is simulated and generated above the foundation pit support structure, and the simulated drop surface is meshed. The center point of each mesh is a simulated drop point, and the simulated drop points are numbered in a sequential numbering manner. A random number generation algorithm is used to randomly generate 5% of the simulated drop points for random drop collision simulation; The specific method of random side collision simulation is: Generate a simulated collision surface in the lateral simulation of the foundation pit support structure, grid the simulated collision surface, the center point of each grid is the simulated collision point, the simulated collision points are numbered in a sequential numbering manner, and a random number generation algorithm is used to randomly generate 5% of the simulated collision points for random lateral collision simulation; The key monitoring points for displacement are the connection nodes of the foundation pit support structure, which record the displacement during the collision period from each simulated collision to one second after the collision and the displacement during the rebound stabilization period after the rebound stabilization ten seconds after the collision.

7. The method for analyzing foundation pit support structure based on collision simulation according to claim 6 is characterized in that: The weight of the falling object in the random drop collision simulation is randomly generated between one kilogram and one hundred kilograms; the collision force in the random lateral collision simulation is randomly generated between one hundred newtons and one thousand newtons, and the initial collision speed is randomly generated between 1m / s and 5m / s.

8. The method for analyzing foundation pit support structure based on collision simulation according to claim 7 is characterized in that: In step 5, the maximum displacement threshold value during the collision period and the maximum displacement threshold value during the rebound stability period are set, and the displacement value during the collision period and the displacement value during the rebound stability period of the displacement data of each key monitoring point are compared with the maximum displacement threshold value during the collision period and the maximum displacement threshold value during the rebound stability period respectively. If the value exceeds the corresponding threshold value, the unqualified collision simulation analysis result is output, and the collision simulation parameters are added to the unqualified collision simulation analysis result.

9. The foundation pit support structure analysis system based on collision simulation is characterized by: The invention comprises a memory (1) and a computer (2), wherein the memory (1) stores an analysis program designed by the foundation pit support structure analysis method based on collision simulation according to any one of claims 1 to 8, and the computer (2) is pre-installed with computer-aided design software and finite element analysis software. The computer (2) is connected to the memory (1) for communication, runs the analysis program, and associates the computer-aided design software and the finite element analysis software to automatically analyze the foundation pit support structure, and outputs the collision simulation analysis results and stores them in the memory (1).

10. The foundation pit support structure analysis system based on collision simulation according to claim 9, characterized in that: It also includes a display (3), which is communicatively connected to the computer (2), and the computer (2) controls the display (3) to display the simulation analysis process and the simulation analysis results.

Images