An integrated method for three-dimensional forward design and calculation of foundation pit

Abstract

The present invention relates to an integrated method for three-dimensional forward design calculation of a foundation pit, comprising the following steps: 1) obtaining geological exploration drilling data, establishing a three-dimensional geological model, and importing surrounding environment data on the three-dimensional geological model; 2) obtaining foundation pit scheme design data, generating a foundation pit on the three-dimensional geological model, obtaining a three-dimensional foundation pit model, and performing visual display; 3) converting the three-dimensional foundation pit model into a three-dimensional foundation pit numerical calculation model; 4) performing foundation pit structure verification based on the three-dimensional foundation pit numerical calculation model to determine whether the stress deformation of the foundation pit meets the design requirements, and if so, exporting the three-dimensional geological model and the three-dimensional foundation pit model and the attribute parameters integrated on the model as a BIM model, and if not, returning to step 2). Compared with the prior art, the present invention has the advantages of high design efficiency and reduced calculation time.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to a deep foundation pit design method, and in particular to a foundation pit three-dimensional forward design calculation integrated method. Background Art

[0002] Traditional deep foundation pit design mainly relies on 2D CAD design. Each drawing is independent of each other, and the geological information is abstract. It requires professional interpretation, which is not as complete and accurate as 3D design in terms of data information. In recent years, BIM technology has gradually been applied in deep foundation pit projects. The basic design process of BIM reverse design is as follows:

[0003] (1) The survey and design unit conducts geological survey and draws a geological longitudinal profile of the foundation pit site;

[0004] (2) The design unit shall make a preliminary design of the foundation pit location, excavation depth and support form based on the geological conditions and the surrounding environment;

[0005] (3) Select unfavorable sections, establish a two-dimensional calculation model, and use the code requirements and recommended methods to verify the structural parameters in the preliminary design scheme to verify whether the design requirements in the code are met;

[0006] (4) If the design requirements are not met, modify the structural design parameters and repeat step (3); if the requirements are met, draw two-dimensional drawings (longitudinal section, cross section, reinforcement drawing, etc.) according to the design plan;

[0007] (5) The design unit or other units shall establish a three-dimensional BIM model based on the above two-dimensional design drawings.

[0008] The main disadvantage of the above design method is that the BIM model is just a re-mold of the design drawing. The design is completed first and then the BIM model is established. It still remains at the stage of re-mold based on the two-dimensional design drawings. Once the design plan changes, the BIM model needs to be rebuilt. This reverse BIM modeling solution is inefficient. On the other hand, the above method separates the design and calculation parts. It is impossible to directly perform three-dimensional calculations on the design plan and then feed it back to the design plan for adjustment, resulting in the BIM model being out of sync with the design.

[0009] BIM design software usually needs to output three-dimensional models and then import them into large-scale general finite element software for numerical analysis and calculation. At this time, there will be inconsistencies in the model encoding format, which can easily cause data loss during the model format conversion process.

[0010] The prior art also uses a three-dimensional version of the common foundation pit design software on the market (such as: Lizheng Deep Foundation Pit, PKPM) to establish a simplified three-dimensional calculation model for calculation, but the calculation results only include the stress and deformation of the retaining structure and the internal support system, and cannot calculate the surface settlement and the displacement field distribution of the soil below the surface. It cannot reflect the impact of the foundation pit excavation on the surrounding buildings, and the calculation results are not comprehensive enough. Summary of the invention

[0011] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide an integrated method for three-dimensional forward design and calculation of foundation pits with high design efficiency and capable of reducing calculation time.

[0012] The purpose of the present invention can be achieved by the following technical solutions:

[0013] A three-dimensional forward design calculation integrated method for foundation pit comprises the following steps:

[0014] 1) Acquire geological exploration drilling data, establish a three-dimensional geological model, and import surrounding environment data into the three-dimensional geological model;

[0015] 2) Acquire foundation pit design data, generate a foundation pit in the three-dimensional geological model, obtain a three-dimensional foundation pit model, and perform visual display;

[0016] 3) converting the three-dimensional foundation pit model into a three-dimensional foundation pit numerical calculation model, the calculation model automatically inherits the key geological parameters of the stratum and the structural design parameters;

[0017] 4) Perform foundation pit structure verification based on the three-dimensional foundation pit numerical calculation model to determine whether the foundation pit stress deformation meets the design requirements. If so, export the three-dimensional geological model and the three-dimensional foundation pit model and the attribute parameters integrated on the model into a BIM model. If not, return to step 2).

[0018] Furthermore, the three-dimensional geological model is specifically established as follows:

[0019] Obtain all the borehole data in the site area, and generate a stratigraphic sequence table for this area based on the relationship between adjacent strata in each borehole and combined with the soil mechanics parameters of the strata;

[0020] Spatial interpolation is performed on the basis of the stratigraphic sequence table to generate a three-dimensional geological model including stratigraphic parameters.

[0021] Furthermore, the spatial interpolation method includes a built-in algorithm, a triangulation method, a distance inverse weighted method, a minimum curvature method or a nearest neighbor method.

[0022] Furthermore, the formation parameters include groundwater level, distribution of various formations, elevation, soil compression modulus, soil cohesion and soil internal friction angle.

[0023] Furthermore, the surrounding environment data includes GIS data of buildings, roads and pipelines.

[0024] Furthermore, the foundation pit scheme design data includes foundation pit control network data, support system data and material property data.

[0025] Furthermore, in step 2), the three-dimensional geological model within the foundation pit is deleted through Boolean operations, and a three-dimensional foundation pit retaining structure model is automatically generated, and the three-dimensional geological model around the foundation pit is virtualized, so that the foundation pit structure, stratum distribution and surrounding buildings can be visualized at the same time.

[0026] Furthermore, the stress and deformation of the foundation pit includes the stress and deformation of the support system and the deformation of the soil outside the pit.

[0027] Furthermore, a three-dimensional foundation pit load-structure method calculation model is established, and three-dimensional calculation analysis is performed to obtain the stress and deformation of the support system.

[0028] Furthermore, the displacement field of the layered soil outside the pit is inversely analyzed by using the wall deformation to obtain the deformation of the soil outside the pit. Specifically:

[0029] (1) Select the foundation pit section and establish the plane strain analysis model. The displacement field formula of the i-th layer of soil is:

[0030]

[0031]

[0032]

[0033]

[0034] In the above formula, u(x,z) and w(x,z) are the displacements of the soil behind the wall in the x and z directions respectively; x is the horizontal distance from the calculation point to the retaining wall, and z is the distance from the calculation point to the ground surface; λ and G are Lame parameters, E and ν are the elastic modulus and Poisson's ratio of the soil respectively, and the subscript i represents the soil parameters of the i-th layer;

[0035] (2) Solving the displacement field formula, we can obtain the general solution of the equation, i.e., the horizontal displacement and vertical displacement expressions of the i-th layer of soil behind the wall:

[0036]

[0037]

[0038] In the above formula, z is the calculated depth; x is the distance from the pit to the retaining wall; K1, K2, and A are the boundary coefficients obtained by solving the side and top boundary conditions;

[0039] (3) According to the deformation coordination, the displacement of the top surface of the current soil layer is the same as the displacement of the bottom surface of the previous soil layer. At the same time, the current soil layer u(0,z) is the deformation of the retaining wall corresponding to this soil layer. Starting from the first layer of soil at the top, the deformation expression of all soil layers behind the retaining wall is obtained based on the general solution of the equation;

[0040] (4) On the basis of satisfying the calculation accuracy, the profile is divided at a certain interval to solve the settlement curve of the interface between the ground surface and the soil layer. Interpolation calculation is used between the profiles to obtain the three-dimensional soil layer settlement trough around the foundation pit, and then the soil deformation outside the pit is obtained.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. The present invention is based on the concept of three-dimensional forward design. A three-dimensional geological model is established according to drilling information. Three-dimensional design of the foundation pit is performed on the geological model, and a calculation model is output at the same time. Three-dimensional modeling is adopted from the design stage of the foundation pit engineering scheme. The geological and structural three-dimensional model information is continuously transmitted and transformed to realize three-dimensional digitization of the foundation pit engineering in all stages, effectively improving the efficiency of collaborative design.

[0043] 2. The forward design method of the present invention integrates design and calculation, directly carries out three-dimensional foundation pit structure design on the three-dimensional geological model and environmental model, and visually displays the spatial position relationship between the foundation pit and the geological and environmental space, with the aim of improving design efficiency and calculation rationality, while further strengthening visual design.

[0044] 3. The present invention has a design scheme verification and design parameter feedback part, covering the entire forward design process, and directly performs parametric design on the three-dimensional geological model. It can directly generate a numerical calculation model for structural verification, feed back the calculation results to the design part, adjust the design parameters, update the calculation model in real time, and repeatedly verify.

[0045] 4. The present invention adopts parametric design means to directly generate numerical models and calculation models containing parameter attributes for structural verification, avoiding the problems of format conversion and data loss between BIM software and finite element software.

[0046] 5. The present invention adopts the method of inferring the displacement field of the soil behind the foundation pit retaining wall by the deformation of the foundation pit retaining wall. It is suitable for multi-layer geology and has a wider range of applications. Compared with three-dimensional finite element calculation, it greatly reduces the calculation time and improves the calculation efficiency.

[0047] 6. Under the premise of meeting the requirements of calculation accuracy, the foundation pit model is divided into a single foundation pit section, and a plane strain analysis model is established to derive the expression of the displacement field behind the retaining wall of the stratified stratum foundation pit. The interpolation algorithm is used between each section to calculate the three-dimensional displacement field outside the foundation pit. Compared with the empirical formula calculation method used in traditional foundation pit calculation software, this method can take into account the complex stratified geology, and the calculation parameters include the geological parameters of multiple strata. The calculation results are more reasonable, the application range is wider, and more in line with the actual geological conditions. Compared with the three-dimensional finite element calculation method, this method does not require the construction of a three-dimensional finite element model, the calculation is not affected by hardware equipment, the calculation time is greatly shortened, and the efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is the forward design flow chart of the present invention;

[0049] Figure 2 It is a flow chart of the calculation of three-dimensional deformation outside the foundation pit of the present invention;

[0050] Figure 3 It is a deformation calculation diagram for excavation of a foundation pit of a stratified soil layer according to the present invention. DETAILED DESCRIPTION

[0051] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0052] Explanation of terms

[0053] BIM: Building Information Modeling, a computer-aided design based on three-dimensional graphics, object-oriented, and architecture, can help realize the integration of building information. From the design, construction, operation to the end of the building's life cycle, various information is always integrated in a three-dimensional model information database. Design teams, construction units, facility operation departments, owners and other parties can work together based on BIM.

[0054] Three-dimensional geological modeling: Using computer technology, in a three-dimensional environment, we combine tools such as spatial information management, geological interpretation, spatial analysis and prediction, geostatistics, entity content analysis, and graphic visualization to generate three-dimensional quantitative stochastic models.

[0055] Geological drilling: Use a drilling rig to drill from the surface downward to form a cylindrical borehole in the stratum to identify and divide the stratum. Cores, ore samples, and soil samples can be obtained from different depths in the borehole for analysis and research to determine the physical and mechanical properties and indicators of rocks and soil layers to provide design needs.

[0056] GIS: Geographic Information System, a technical system that, with the support of computer hardware and software systems, collects, stores, manages, calculates, analyzes, displays and describes relevant geographical distribution data in the entire or part of the earth's surface (including the atmosphere).

[0057] Geological section: an actual (or inferred) section along a certain direction that shows the geological structure on the surface or within a certain depth.

[0058] The present invention provides an integrated method for three-dimensional forward design and calculation of foundation pits. First, a three-dimensional geological model is established. On this basis, the spatial position of the foundation pit and the form and parameters of the supporting structure are designed. At the same time, a calculation model is automatically generated to perform verification and calculation required by relevant specifications. The calculation results can be fed back to the design. After adjusting the parameters, a new calculation model is automatically regenerated and verified again until the requirements are met and the BIM model and design drawings are output. Figure 1 As shown, the method comprises the following steps:

[0059] S1. Based on the obtained geological exploration drilling data, the borehole spatial coordinates and stratum geological parameters are obtained. The geological parameters mainly include groundwater level, distribution of various strata, elevation, soil compression modulus, soil cohesion, soil internal friction angle, etc.

[0060] S2. Obtain all the borehole data in the site area, automatically determine and generate the stratigraphic sequence table of this area based on the relationship between adjacent strata in each borehole and the soil mechanics parameters of the strata; perform spatial interpolation on the basis of the stratigraphic sequence table to generate a three-dimensional geological model containing stratigraphic parameter data. Among them, the spatial interpolation method can use built-in algorithms, triangulation method, inverse distance weighted method, minimum curvature method, nearest neighbor method, etc.

[0061] S3. Import the GIS data of the surrounding environment, such as buildings, roads, and pipelines, into the 3D geological model and mark them at the corresponding spatial positions of the 3D geological model.

[0062] S4. Design the foundation pit scheme on the three-dimensional geological model, including importing the foundation pit control network, setting the support system and material properties. The support system is divided into retaining structure and internal support structure.

[0063] The design of retaining structures is mainly divided into: retaining structure form, geometric dimensions and material properties.

[0064] The main forms of retaining structures are: soil nail wall, gravity retaining wall, underground continuous wall, pile row, steel-inserted cement-soil mixing wall, and steel sheet pile.

[0065] The geometric dimensions vary according to different structural forms, and are mainly the geometric dimensions that characterize the shape of the retaining wall, such as length, width, thickness, depth, diameter, and angle.

[0066] The material parameters of retaining wall structure include: concrete, steel bars and steel.

[0067] The design of the internal support structure is mainly divided into: internal support structure form, geometric dimensions and material properties.

[0068] The internal support structure mainly includes: perimeter purlin, internal support, column and column pile. Among them, the perimeter purlin structure mainly includes: concrete perimeter purlin, steel perimeter purlin; the internal support structure mainly includes: concrete support, steel support; the column structure mainly includes: steel column, steel pipe column, steel partition column, steel pipe concrete column; the column pile mainly includes: concrete pile, steel pipe pile.

[0069] The geometric dimensions vary according to different structural forms, and are mainly the geometric dimensions that characterize the shape of the retaining wall, such as length, width, thickness, depth, diameter, and angle.

[0070] The material parameters of the internal support structure include: concrete, steel bars, and steel.

[0071] S5. According to the design plan, the three-dimensional geological model within the scope of the foundation pit is deleted through Boolean operation, and a three-dimensional foundation pit model is automatically generated. The visualization of the foundation pit structure, stratum distribution and surrounding buildings is realized through the method of virtualizing the geological model.

[0072] S6. Convert the three-dimensional foundation pit model into a three-dimensional foundation pit numerical calculation model. The calculation model automatically inherits the key geological parameters of the stratum and integrates the structural design parameters.

[0073] S7. Respond to the instructions for the section to be verified, and perform two-dimensional verification in accordance with relevant foundation pit specifications. It can also perform three-dimensional calculation of the overall retaining structure of the foundation pit to obtain the force and deformation of the support system.

[0074] The 3D structure verification process includes the following steps:

[0075] (1) According to the stratum distribution and calculation accuracy, the geological model is automatically cut at intervals along the perimeter of the foundation pit to obtain the geological cross-section of the section.

[0076] (2) According to the distribution of strata on the geological cross-section, vertical earth pressure, lateral earth pressure and water pressure are calculated in accordance with the design specifications. The lateral earth pressure between each section is calculated by interpolation method.

[0077] (3) A three-dimensional foundation pit load-structure calculation model is established, and the lateral water and soil pressure calculated by the above method is applied to the retaining wall side of the model.

[0078] (4) Conduct three-dimensional calculation and analysis, including the stress and deformation characteristics of the retaining structure and internal support structure.

[0079] S8. According to the deformation of the foundation pit retaining structure, the ground settlement and the displacement field of the soil below the bottom are back-analyzed and extrapolated to obtain the deformation result of the soil outside the foundation pit.

[0080] The displacement field of the soil outside the foundation pit can be calculated by three-dimensional finite element method, or predicted by random medium theory, grayscale theory, and Peck empirical formula. In this embodiment, considering the actual geological conditions and improving the calculation speed and portability, a method for calculating the displacement field of the foundation pit soil in stratified strata is proposed, and the displacement field of the soil outside the pit is analyzed by wall deformation. Figure 2 As shown, the following steps are included:

[0081] (1) Select the foundation pit section and establish a plane strain analysis model. Figure 3 As shown in the figure, the i-th layer of soil is selected as the research object, and the soil displacement field formula is:

[0082]

[0083]

[0084]

[0085]

[0086] In the above formula, u(x,z) and w(x,z) are the displacements of the soil behind the wall in the x and z directions, respectively; x is the horizontal distance from the calculation point to the retaining wall, and z is the distance from the calculation point to the ground surface; λ and G are Lame parameters, E and ν are the elastic modulus and Poisson's ratio of the soil, respectively, and the subscript i represents the soil parameters of the i-th layer.

[0087] (2) By solving the above partial differential equation, we can obtain the general solution of the equation, that is, the horizontal displacement and vertical displacement expressions of the i-th layer of soil behind the wall:

[0088]

[0089]

[0090] In the above formula, z is the calculated depth; x is the distance from the outside of the pit to the retaining wall; K1, K2, and A are the boundary coefficients obtained by solving the boundary conditions.

[0091] (3) The internal displacement field of each soil layer in the layered foundation conforms to the general solution obtained in the above step (2), and the displacement field expression of each soil layer can be obtained.

[0092] (4) Start the solution from the first layer of soil at the top. The stress on the top surface of the soil layer is 0, and the displacement u(0,z) on the far left of the soil layer is the deformation of the retaining wall. Substitute the two boundary conditions into the general solution to solve the relevant parameters.

[0093] (5) Similarly, according to deformation coordination, the displacement of the top surface of the second soil layer is the same as the displacement of the bottom surface of the first soil layer. At the same time, u(0,z) of the second soil layer is also the deformation of the retaining wall corresponding to this soil layer. The two boundary conditions are brought into the general solution to solve the relevant parameters of the displacement field of this soil layer.

[0094] (6) Repeat step (5) to solve the displacement field expression of each layer of soil in turn, and finally obtain the deformation expression of all soil layers behind the retaining wall.

[0095] (7) On the basis of satisfying the calculation accuracy, the profile is automatically divided at a certain interval to solve the settlement curve of the surface and soil interface. Interpolation calculation is used between the profiles to obtain the three-dimensional soil settlement trough around the foundation pit, and then the soil deformation outside the pit is obtained.

[0096] The above convenient method for calculating the stratum displacement field can replace the traditional empirical formula and finite element calculation method; according to the deformation of the retaining wall, the displacement field of the soil behind the wall is inferred, and the deformation of the stratum interface is continuous. The Lame equation of the plane strain static problem is used to solve it, and the side and top surface boundary conditions are introduced. It is extended layer by layer to obtain the displacement field expression of the soil layer behind the retaining wall that can take into account the stratified strata; compared with the traditional empirical formula, the calculation results are more reasonable, the application range is wider, and it is more in line with the actual geological conditions; compared with the three-dimensional finite element method, the calculation speed is faster and the use is more convenient.

[0097] S9. If the calculations of step S7 and step S8 do not meet the design requirements, return to step S4 to reset the foundation pit design parameters, and the three-dimensional foundation pit model is automatically updated and recalculated until it meets the design requirements.

[0098] S10. If the calculations of step S7 and step S8 meet the design requirements, the two-dimensional design drawings and calculation reports are automatically output, and the three-dimensional geological model and three-dimensional foundation pit model as well as the attribute parameters integrated on the model are exported as a BIM model.

[0099] If the above method is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0100] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A three-dimensional forward design calculation integrated method for foundation pit, characterized in that: The following steps are involved: 1) Acquire geological exploration drilling data, establish a three-dimensional geological model, and import surrounding environment data into the three-dimensional geological model; 2) Acquire foundation pit design data, generate a foundation pit in the three-dimensional geological model, obtain a three-dimensional foundation pit model, and perform visual display; 3) converting the three-dimensional foundation pit model into a three-dimensional foundation pit numerical calculation model, the calculation model automatically inherits the key geological parameters of the stratum and the structural design parameters; 4) Performing foundation pit structure verification based on the three-dimensional foundation pit numerical calculation model to determine whether the foundation pit stress deformation meets the design requirements. If so, exporting the three-dimensional geological model and the three-dimensional foundation pit model and the attribute parameters integrated on the model into a BIM model. If not, returning to step 2); The stress and deformation of the foundation pit includes the stress and deformation of the support system and the deformation of the soil outside the pit; The displacement field of the layered soil outside the pit is inversely analyzed by using the wall deformation to obtain the deformation of the soil outside the pit. Specifically: (1) Select the foundation pit section and establish the plane strain analysis model. The displacement field formula of the i-th layer of soil is: In the above formula, u(x,z) and w(x,z) are the displacements of the soil behind the wall in the x and z directions respectively; x is the horizontal distance from the calculation point to the retaining wall, and z is the distance from the calculation point to the ground surface; λ and G are Lame parameters, E and ν are the elastic modulus and Poisson's ratio of the soil respectively, and the subscript i represents the soil parameters of the i-th layer; (2) Solving the displacement field formula, we can obtain the general solution of the equation, i.e., the horizontal displacement and vertical displacement expressions of the i-th layer of soil behind the wall: In the above formula, z is the calculated depth; x is the distance from the pit to the retaining wall; K1, K2, and A are the boundary coefficients obtained by solving the side and top boundary conditions; (3) According to the deformation coordination, the displacement of the top surface of the current soil layer is the same as the displacement of the bottom surface of the previous soil layer. At the same time, the current soil layer u(0,z) is the deformation of the retaining wall corresponding to this soil layer. Starting from the first layer of soil at the top, the deformation expression of all soil layers behind the retaining wall is obtained based on the general solution of the equation; (4) On the basis of satisfying the calculation accuracy, the profile is divided at a certain interval to solve the settlement curve of the interface between the ground surface and the soil layer. Interpolation calculation is used between the profiles to obtain the three-dimensional soil layer settlement trough around the foundation pit, and then the soil deformation outside the pit is obtained.

2. The integrated method for three-dimensional forward design calculation of foundation pit according to claim 1 is characterized in that: The establishment of the three-dimensional geological model specifically includes: Obtain all the borehole data in the site area, and generate a stratigraphic sequence table for this area based on the relationship between adjacent strata in each borehole and combined with the soil mechanics parameters of the strata; Spatial interpolation is performed on the basis of the stratigraphic sequence table to generate a three-dimensional geological model including stratigraphic parameters.

3. The integrated method for three-dimensional forward design calculation of foundation pit according to claim 2 is characterized in that: The spatial interpolation method includes a built-in algorithm, a triangulation method, a distance inverse weighted method, a minimum curvature method or a nearest neighbor method.

4. The integrated method for three-dimensional forward design calculation of foundation pit according to claim 2 is characterized in that: The formation parameters include groundwater level, distribution of various formations, elevation, soil compression modulus, soil cohesion and soil internal friction angle.

5. The integrated method for three-dimensional forward design calculation of foundation pit according to claim 1 is characterized in that: The surrounding environment data includes GIS data of buildings, roads and pipelines.

6. The integrated method for three-dimensional forward design calculation of foundation pit according to claim 1 is characterized in that: The foundation pit scheme design data includes foundation pit control network data, support system data and material property data.

7. The integrated method for three-dimensional forward design calculation of foundation pit according to claim 1 is characterized in that: In step 2), the three-dimensional geological model within the foundation pit is deleted through Boolean operations, and a three-dimensional foundation pit retaining structure model is automatically generated, and the three-dimensional geological model around the foundation pit is virtualized, so that the foundation pit structure, stratum distribution and surrounding buildings can be visualized at the same time.

8. The integrated method for three-dimensional forward design calculation of foundation pit according to claim 1 is characterized in that: A three-dimensional foundation pit load-structure method calculation model is established, and three-dimensional calculation analysis is performed to obtain the force and deformation of the support system.

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