Numerical simulation-based method for determining critical uplift depth of building

Abstract

Provided is a numerical simulation-based method for determining a critical uplift depth of a building, comprising: on the basis of a Midas-gts numerical modeling system, creating an initial building model; separately performing simulated uplifts on a plurality of uplift surfaces in the initial building model; obtaining a plurality of primary simulated settlement displacements of the initial building model after the simulated uplifts; taking the depth of an uplift surface corresponding to a primary simulated settlement displacement having a maximum difference with an initial settlement displacement as an initial critical uplift depth; performing secondary simulated uplifts on uplift surfaces above and below the initial critical uplift surface; and determining whether an uplift surface having a larger difference is present, and if yes, taking the depth corresponding to the uplift surface having the larger difference as a critical uplift depth, and if not, taking the initial critical uplift depth as a critical uplift depth.

Description

Determination of critical uplift depth of buildings based on numerical simulation

[0001] The present invention relates to the technical field of building foundation correction and lifting, and in particular to a method for determining a critical lifting depth of a building based on numerical simulation. Background Art

[0002] The increasing construction of high-rise buildings has led to an increasing number of uneven settlements due to various reasons. Grouting correction and lifting technologies offer significant advantages in terms of correction effectiveness, workspace, and environmental factors. Compaction grouting, in particular, can effectively cause ground uplift, offering advantages such as cost-effectiveness, efficiency, and environmental friendliness. Therefore, it is widely used in building correction and lifting projects. However, for compaction grouting to achieve this lifting effect, selecting the appropriate grouting location is crucial, as this effect does not occur at all depths. Too shallow a depth results in insufficient overburden pressure, preventing soil compaction and increasing the risk of grouting. Too deep a depth results in insufficient pressure from grouting bubbles to lift the soil, leading to cracking. Therefore, a critical lifting depth should be determined for the building, ensuring that grouting at this depth achieves the best and most economical lifting effect. However, traditional methods often rely on construction experience to determine this critical lifting depth, resulting in inaccurate calculations and significant construction risks and problems. This significantly reduces the lifting effect, resulting in poor efficiency and effectiveness. Summary of the Invention

[0003] The purpose of the present invention is to solve at least one technical problem in the background technology and provide a method for determining the critical uplift depth of a building based on numerical simulation.

[0004] To achieve the above object, the present invention provides a method for determining the critical uplift depth of a building based on numerical simulation, comprising:

[0005] An initial building model representing the building that has undergone settlement is established based on the Midas-gts numerical modeling system, and the initial settlement displacement of the building is obtained according to the initial building model;

[0006] Performing multiple simulated uplifts of different degrees on a plurality of uplift surfaces representing different stratum depths in the initial building model;

[0007] According to the result of a simulated uplift, multiple simulated settlement displacements of the initial building model after the simulated uplift are obtained;

[0008] Compare each simulated settlement displacement with the initial settlement displacement, and take the uplift surface corresponding to the simulated settlement displacement with the largest difference from the initial settlement displacement as the initial critical uplift surface, and its corresponding depth as the initial critical uplift depth;

[0009] Continue to perform multiple secondary simulated uplifts of different degrees on different uplift surfaces above and below the initial critical uplift surface;

[0010] According to the secondary simulation uplift results, it is judged whether there is an uplift surface with a larger difference from the initial settlement displacement. If so, the uplift surface with a larger difference is taken as the critical uplift surface, and its corresponding depth is taken as the critical uplift depth; if not, the initial critical uplift surface is taken as the critical uplift surface, and the initial critical uplift depth is taken as the critical uplift depth.

[0011] According to one aspect of the present invention, establishing an initial building model representing a building that has undergone settlement includes:

[0012] Based on the Midas-gts numerical modeling system, the stratum geometry model and the building geometry model are established according to the geological survey data parameters and the construction drawing data parameters;

[0013] Inputting material property parameters into the stratum geometry model and the building geometry model respectively;

[0014] Meshing the stratum geometry model and the building geometry model;

[0015] Applying gravity load and soil static boundary conditions to the meshed stratum geometry model and building geometry model to form an initial building model;

[0016] Among them, material property parameters include elastic modulus, void ratio, Poisson's ratio and bulk density.

[0017] According to one aspect of the present invention, multiple raised surfaces representing different stratum depths in the initial building model are subjected to multiple simulated raisings of different degrees, including:

[0018] Selecting multiple uplift surfaces representing different stratum depths in the stratum geometry model;

[0019] Setting multiple sets of different volume expansion coefficients for each lifting surface;

[0020] A simulated lifting is performed on each lifting surface according to different volume expansion coefficients, and a different simulated lifting result is obtained for each lifting surface.

[0021] According to one aspect of the present invention, the multiple lifting surfaces representing different stratum depths in the selected stratum geometric model are:

[0022] Multiple uplift surfaces representing different stratum depths are selected in the area where the largest settlement deformation occurs in the stratum geometric model.

[0023] According to one aspect of the present invention, the boundary of the stratum geometric model is larger than the boundary of the building geometric model.

[0024] According to one aspect of the present invention, the geological survey data includes a stratigraphic cross-section diagram and a foundation design parameter table, and the stratigraphic geometric model is constructed using the stratigraphic cross-section diagram and the foundation design parameter table.

[0025] According to one aspect of the present invention, a plurality of secondary simulated liftings of different degrees are continuously performed on different lifting surfaces above and below the initial critical lifting surface, including:

[0026] A plurality of secondary simulated uplift surfaces representing different depths are selected between the initial critical uplift surface and the upper and lower uplift surfaces adjacent thereto that participate in the first simulated uplift;

[0027] The secondary simulated lifting surfaces are subjected to multiple secondary simulated lifting at different degrees, and corresponding different secondary simulated lifting results are obtained for each secondary simulated lifting surface.

[0028] According to one aspect of the present invention, based on the secondary simulation uplift results, it is determined whether there is an uplift surface with a larger difference from the initial settlement displacement:

[0029] According to the secondary simulated uplift results, multiple secondary simulated settlement displacements of the initial building model after the simulated uplift are obtained;

[0030] The difference between each secondary simulated settlement displacement and the initial settlement displacement is calculated, and then it is determined whether there is a difference greater than the difference between the primary simulated settlement displacement and the initial settlement displacement.

[0031] The present invention addresses the fact that grouting theory lags behind practice, leading to design and construction often relying solely on empirical evidence, often leading to project failures. This invention utilizes the Midas-gts modeling system to simulate and compare different grouting effects, introducing a definition for the critical uplift depth of buildings. This approach provides valuable theoretical guidance for engineering practice and addresses the issue of grouting failures often caused by relying solely on empirical evidence.

[0032] The present invention uses the Midas-gts modeling system to apply different expansion coefficients at different depths of the building's strata for trial calculations, determining the building's critical uplift depth and finding the location where the grouting uplift effect is most significant. This provides a numerical simulation reference for engineering practice projects, facilitating the orderly advancement and progress of subsequent projects.

[0033] In the actual grouting process, different grouting design schemes produce very different lifting effects. In many cases, slurry waste increases project costs and the grouting effect is difficult to control, which makes the grouting project a safety hazard. The present invention adopts a numerical simulation method to achieve both engineering economy and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 schematically shows a flow chart of a method for determining a critical uplift depth of a building based on numerical simulation according to an embodiment of the present invention;

[0035] FIG2 is an initial settlement displacement diagram of the initial building model of Example 1;

[0036] FIG3 is a plan view of the expansion displacement application area of ​​Example 1;

[0037] FIG4 is a cross-sectional view of the applied depth of the expansion displacement of a simulated lift in Example 1;

[0038] FIG5 is a broken line graph of the settlement displacement at the characteristic point K1 of a simulated lift in Example 1;

[0039] FIG6 is a broken line graph of the settlement displacement at the characteristic point K2 of a simulated lift in Example 1;

[0040] FIG7 is a broken line graph of the settlement displacement at the characteristic point K3 of a simulated lift in Example 1;

[0041] FIG8 is a cross-sectional view of the applied depth of the expansion displacement of the secondary simulated lift in Example 1;

[0042] FIG9 is a broken line graph of the settlement displacement at the characteristic point K1 of the secondary simulated lifting in Example 1;

[0043] FIG10 is a broken line graph of the settlement displacement at the characteristic point K2 of the secondary simulated lifting in Example 1;

[0044] FIG11 is a broken line graph of the settlement displacement at the characteristic point K3 of the secondary simulated lifting in Example 1. FIG. DETAILED DESCRIPTION

[0045] The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are only intended to enable those skilled in the art to better understand and implement the present invention, rather than to imply any limitation on the scope of the present invention.

[0046] As used herein, the term "including" and variations thereof are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment."

[0047] FIG1 schematically shows a flow chart of a method for determining a critical uplift depth of a building based on numerical simulation according to an embodiment of the present invention. As shown in FIG1 , in this embodiment, the method for determining a critical uplift depth of a building based on numerical simulation includes:

[0048] a. Based on the MIDAS-GTS numerical modeling system, an initial building model representing the building that is experiencing settlement is established, and the initial settlement displacement of the building is obtained based on the initial building model;

[0049] b. performing multiple simulated uplifts of different degrees on multiple uplift surfaces representing different stratum depths in the initial building model;

[0050] c. Based on the results of the first simulated uplift, obtain multiple simulated settlement displacements of the initial building model after the simulated uplift;

[0051] d. Compare each simulated settlement displacement with the initial settlement displacement, and use the uplift surface corresponding to the simulated settlement displacement with the largest difference from the initial settlement displacement as the initial critical uplift surface, and the corresponding depth as the initial critical uplift depth;

[0052] e. Continue to perform multiple secondary simulated lifts of different degrees on different lift surfaces above and below the initial critical lift surface;

[0053] f. Based on the secondary simulation uplift results, determine whether there is an uplift surface with a larger difference from the initial settlement displacement. If so, use the uplift surface with a larger difference as the critical uplift surface, and its corresponding depth as the critical uplift depth. If not, use the initial critical uplift surface as the critical uplift surface, and the initial critical uplift depth as the critical uplift depth.

[0054] According to one embodiment of the present invention, in step a above, establishing an initial building model representing the building that has undergone settlement includes:

[0055] Based on the Midas-gts numerical modeling system, the stratum geometry model and the building geometry model are established according to the geological survey data parameters and the construction drawing data parameters;

[0056] Inputting material property parameters into the stratum geometry model and the building geometry model respectively;

[0057] Meshing the stratum geometry model and the building geometry model;

[0058] Applying gravity load and soil static boundary conditions to the meshed stratum geometry model and building geometry model to form an initial building model;

[0059] Among them, material property parameters include elastic modulus, void ratio, Poisson's ratio and bulk density.

[0060] In this embodiment, a stratum geometry model and a building geometry model are established based on geological survey data, building construction drawings, and other data. Material property parameters are input, and loads and boundary conditions are added to form the aforementioned initial building model. Once the initial building model is calculated, it includes stress diagrams, strain diagrams, settlement-deformation diagrams, bending moment diagrams, shear force diagrams, and other information. The initial building settlement displacement in step a can be obtained from these settlement-deformation diagrams. The relevant settlement displacement information described below can also be obtained from the corresponding settlement-deformation diagrams for each model, and will not be further elaborated on.

[0061] Furthermore, according to an embodiment of the present invention, in the above step b, multiple lifting surfaces representing different stratum depths in the initial building model are subjected to multiple simulated liftings of different degrees, including:

[0062] Select multiple uplift surfaces representing different stratum depths in the stratum geometric model (a primary simulation uplift surface, i.e., the uplift surface used for the first simulation);

[0063] Setting multiple sets of different volume expansion coefficients for each lifting surface;

[0064] A simulated lift is performed on each lifting surface based on different volume expansion coefficients, resulting in different simulated lift results for each lifting surface (i.e., different volume expansion coefficients produce different lift results). This setup uses the volume expansion coefficients to simulate the effects of grouting pressure, causing soil volume expansion, resulting in displacement and compressing the overlying soil layer, ultimately lifting the overlying structure.

[0065] In this embodiment, multiple lifting surfaces representing different stratum depths in the stratum geometric model are selected as follows:

[0066] Select multiple lifting surfaces representing different stratum depths within the region experiencing the greatest subsidence deformation in the stratum geometry model. This setup allows for greater lift potential after applying expansion displacement to the region experiencing the greatest deformation, resulting in a more pronounced lift effect and greater facilitation for observing and summarizing data patterns and identifying the critical lift depth.

[0067] Furthermore, in this embodiment, the boundary of the stratum geometric model is larger than the boundary of the building geometric model. This arrangement can effectively reduce the impact of the boundary conditions of the stratum geometric model on the grouting process.

[0068] Furthermore, in this embodiment, the geological survey data includes stratigraphic profiles and foundation design parameter tables, and the stratigraphic geometric model is constructed using these profiles. That is, actual soil layer profile parameters are used to construct the stratigraphic geometric model. This arrangement allows for a more realistic reflection of stratigraphic settlement and a more accurate simulation of the uneven settlement and displacement of a building.

[0069] Furthermore, according to one embodiment of the present invention, in the above-mentioned step c, based on the result of the single simulated lifting, multiple single simulated settlement displacements of the initial building model after the simulated lifting are obtained. That is, after each lifting surface undergoes the first simulated lifting using different volume expansion coefficients, each lifting surface will obtain the settlement displacement of the initial building model after the lifting through the settlement deformation diagram, i.e., the above-mentioned single simulated settlement displacement. This settlement displacement is obtained after grouting lifting is simulated by applying the volume expansion coefficient. By comparing this settlement displacement with the initial settlement displacement, the lifting effect of each lifting surface can be determined. The smaller the single simulated settlement displacement, the more obvious the lifting effect. That is, the greater the difference between the initial settlement displacement and the single simulated settlement displacement, the more obvious the lifting effect of the lifting surface.

[0070] Furthermore, according to one embodiment of the present invention, in step d above, each simulated settlement displacement is compared with the initial settlement displacement, and the lifting surface corresponding to the simulated settlement displacement with the largest difference from the initial settlement displacement is used as the initial critical lifting surface, and the corresponding depth is used as the initial critical lifting depth. This arrangement can obtain an initial critical lifting surface that serves as a rough critical lifting surface. This initial critical lifting surface has a better lifting effect than other lifting surfaces, but there may be lifting surfaces with better lifting effects in a small range above and below it, so it is the initial critical lifting surface, not the final critical lifting surface.

[0071] Furthermore, according to one embodiment of the present invention, in the above step e, a plurality of secondary simulated lifts (i.e., a second simulated lift) of different degrees are continuously performed on different lift surfaces above and below the initial critical lift surface, including:

[0072] A plurality of secondary simulated uplift surfaces (the uplift surfaces used for the second simulated uplift) representing different depths are selected between the initial critical uplift surface and the upper and lower uplift surfaces adjacent to the initial critical uplift surface and participating in the first simulated uplift;

[0073] Each secondary uplift surface is subjected to multiple, varying degrees of secondary uplift, resulting in correspondingly different secondary uplift results. This setup allows for small-scale verification of the initial critical uplift surface, and through this verification, it is determined whether other adjacent uplift surfaces can serve as critical uplift surfaces.

[0074] Furthermore, according to one embodiment of the present invention, in the above step f, based on the secondary simulation uplift result, it is determined whether there is an uplift surface with a larger difference from the initial settlement displacement:

[0075] According to the secondary simulated uplift results, multiple secondary simulated settlement displacements of the initial building model after the simulated uplift are obtained;

[0076] The difference between the secondary simulated settlement displacement and the initial settlement displacement is calculated, and then a determination is made as to whether a greater difference exists than the difference between the primary simulated settlement displacement and the initial settlement displacement. In this embodiment, if such a difference exists, the elevation surface with the greater difference (i.e., the secondary simulated elevation surface) is used as the critical elevation surface, and its corresponding depth is used as the critical elevation depth. If such a difference does not exist, the initial critical elevation surface is used as the critical elevation surface, and the initial critical elevation depth is used as the critical elevation depth. This arrangement allows for more accurate determination of the critical elevation depth, and construction elevation based on the critical elevation depth results in a more pronounced elevation effect.

[0077] In the present invention, settlement displacement refers to the settlement displacement at the bottom of the building raft.

[0078] In the present invention, the expansion coefficient required for unit lifting depth of the building can be calculated based on the settlement deformation after applying the expansion coefficient at the critical lifting depth, and then the expansion coefficient required for lifting other settlement areas can be inferred based on the expansion coefficient required for unit lifting depth of the building.

[0079] According to the above-mentioned solution of the present invention, the development of grouting theory lags behind practice, resulting in the fact that in engineering practice, most design and construction are based solely on experience, which has led to some project failures. This invention uses the Midas-gts modeling system to simulate and compare different grouting effects, introduces a definition of the critical uplift depth of buildings, and has high theoretical guidance significance for engineering practice, solving the problem of grouting failure caused by relying solely on experience.

[0080] The present invention uses the Midas-gts modeling system to apply different expansion coefficients at different depths of the building's strata for trial calculations, determining the building's critical uplift depth and finding the location where the grouting uplift effect is most significant. This provides a numerical simulation reference for engineering practice projects, facilitating the orderly advancement and progress of subsequent projects.

[0081] In the actual grouting process, different grouting design schemes produce very different lifting effects. In many cases, slurry waste increases project costs and the grouting effect is difficult to control, which makes the grouting project a safety hazard. The present invention adopts a numerical simulation method to achieve both engineering economy and safety.

[0082] Based on the above solution of the present invention, the solution of the present invention is described in detail below in the form of a specific embodiment in conjunction with the accompanying drawings.

[0083] Example 1

[0084] A residential building project has one underground floor with a floor height of -5.0m and 26 floors above ground. The ground floor is 5.000m high, and the remaining floors are 2.900m high. The raft foundation rests on a gravel layer. The gravel layer has a high porosity, resulting in insufficient bearing capacity and settlement. The foundation design parameters from the geological survey are shown in Table 1 below:

[0085]

[0086] Midas-gts modeling and analysis was conducted on a typical raft foundation building to verify the feasibility of the actual compaction grouting and deviation correction and lifting construction plan, providing a reference example for similar projects:

[0087] Step 1: Form an initial building model. Based on geological survey data, construction drawings and other information, establish stratum and building models, and input material and property parameters. The elastic modulus is twice Es1-2, and parameters such as Poisson's ratio and bulk density are selected according to the table data. Add gravity load and soil static boundary conditions, etc., form an initial model and calculate to obtain the initial settlement displacement, as shown in Figure 2.

[0088] Step 2: Determine the initial critical lifting depth d0. Apply different volume expansion coefficients (expansion displacement) at different stratum depths corresponding to the area with larger foundation settlement displacement of the initial building model and calculate them, as shown in Figures 2, 3, and 4. Select characteristic points K1, K2, and K3 in the expansion coefficient application area, and record the characteristic points K1, K2, and K3 at different depths (in this embodiment, the characteristic points are selected as the center point, edge point, and corner point in the area where the settlement deformation is the largest. This makes the selected characteristic points more representative, and the lifting effect can be better seen, which facilitates summarizing the rules and finding the optimal critical lifting depth). Fill in the table to record the settlement deformation (one-time simulated settlement displacement) under different "volume expansion coefficients ε" and form a broken line graph, as shown in Tables 2, 3, and 4 below and Figures 5, 6, and 7.

[0089]

[0090]

[0091]

[0092] Without the expansion coefficient applied, the initial settlements at characteristic points K1, K2, and K3 were -134.76mm, -131.32mm, and -124.40mm, respectively. After applying the expansion coefficient to simulate uplift, the settlement displacements changed. Analysis of the data in the aforementioned charts shows that the displacement settlement deformation (i.e., the initial simulated settlement displacement) is minimum at depth d2, indicating the most significant uplift effect. Therefore, the initial critical uplift depth d0 = d2 is determined.

[0093] Step 3: Determine the critical uplift depth dL. Continue applying the expansion coefficient to a small range above and below depth d0 for trial calculations (i.e., secondary simulated uplift) to see if there is a depth dL where the settlement deformation at dL is smaller than the settlement at d0. This depth is selected as the critical uplift depth dL. For example, as shown in Figure 8, continue applying the "volume expansion coefficient ε" to trial calculations at depths d12 and d23 (i.e., the depths corresponding to the secondary simulated uplift surface), both above and below depth d2. It is found that the settlement displacement values ​​at depths d12 and d23 are greater than at depth d2, and the uplift effect at depths d12 and d23 is even less than that at depth d2. Therefore, depth d2 is the turning point, and the critical uplift depth dL is determined to be d2. See Tables 5, 6, and 7 below, as well as Figures 9, 10, and 11.

[0094]

[0095]

[0096]

[0097] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A method for determining the critical uplift depth of a building based on numerical simulation, characterized in that: include: Based on the Midas-gts numerical modeling system, an initial building model representing the building that has undergone settlement is established, and the initial settlement displacement of the building is obtained according to the initial building model; Performing multiple simulated uplifts of different degrees on multiple uplift surfaces representing different stratum depths in the initial building model; According to the result of the first simulated uplift, multiple first simulated settlement displacements of the initial building model after the simulated uplift are obtained; Compare each simulated settlement displacement with the initial settlement displacement, and take the uplift surface corresponding to the simulated settlement displacement with the largest difference with the initial settlement displacement as the initial critical uplift surface, and its corresponding depth as the initial critical uplift depth; Continue to perform multiple secondary simulated uplifts of different degrees on different uplift surfaces above and below the initial critical uplift surface; According to the secondary simulation uplift results, it is judged whether there is an uplift surface with a larger difference from the initial settlement displacement. If so, the uplift surface with a larger difference is taken as the critical uplift surface, and its corresponding depth is taken as the critical uplift depth; if not, the initial critical uplift surface is taken as the critical uplift surface, and the initial critical uplift depth is taken as the critical uplift depth.

2. The method for determining the critical lifting depth of a building based on numerical simulation according to claim 1, characterized in that: Build an initial building model representing the building that will experience settlement, including: Based on the Midas-gts numerical modeling system, the stratum geometry model and the building geometry model are established according to the geological survey data parameters and the construction drawing data parameters; Inputting material property parameters into the stratum geometry model and the building geometry model respectively; Meshing the stratum geometry model and the building geometry model; Applying gravity load and soil static boundary conditions to the meshed stratum geometry model and building geometry model to form an initial building model; Among them, the material property parameters include elastic modulus, porosity, Poisson's ratio and bulk density.

3. The method for determining the critical lifting depth of a building based on numerical simulation according to claim 2, characterized in that: A plurality of lifting surfaces representing different stratum depths in the initial building model are respectively subjected to a plurality of simulated liftings of different degrees, including: Selecting multiple uplift surfaces representing different stratigraphic depths in the stratigraphic geometry model; Setting multiple groups of different volume expansion coefficients for each lifting surface; A simulated lifting is performed on each lifting surface according to different volume expansion coefficients, and correspondingly different simulated lifting results are obtained for each lifting surface.

4. The method for determining the critical lifting depth of a building based on numerical simulation according to claim 3, characterized in that: The multiple lifting surfaces representing different stratum depths in the selected stratum geometric model are: Multiple uplift surfaces representing different stratum depths are selected in the area where the largest settlement deformation occurs in the stratum geometric model.

5. The method for determining the critical lifting depth of a building based on numerical simulation according to claim 2, characterized in that: The boundary of the stratum geometric model is larger than the boundary of the building geometric model.

6. The method for determining the critical lifting depth of a building based on numerical simulation according to claim 2, characterized in that: The geological survey data includes a stratum cross-section diagram and a foundation design parameter table, and the stratum geometric model is constructed using the stratum cross-section diagram and the foundation design parameter table.

7. The method for determining the critical uplift depth of a building based on numerical simulation according to claim 1, characterized in that: The different lifting surfaces above and below the initial critical lifting surface are subjected to multiple secondary simulated lifting of different degrees, including: A plurality of secondary simulated uplift surfaces representing different depths are selected between the initial critical uplift surface and the upper and lower uplift surfaces adjacent thereto that participate in the first simulated uplift; The secondary simulated lifting surfaces are subjected to multiple secondary simulated lifting at different degrees, and correspondingly different secondary simulated lifting results are obtained for each secondary simulated lifting surface.

8. The method for determining the critical uplift depth of a building based on numerical simulation according to any one of claims 1 to 7, characterized in that: According to the secondary simulation uplift results, it is judged whether there is an uplift surface with a larger difference from the initial settlement displacement: According to the secondary simulated uplift results, multiple secondary simulated settlement displacements of the initial building model after the simulated uplift are obtained; The difference between each secondary simulated settlement displacement and the initial settlement displacement is calculated, and then it is determined whether there is a difference greater than the difference between the primary simulated settlement displacement and the initial settlement displacement.

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