Method and system for judging safety of raft during grouting and lifting of building

Abstract

The invention relates to the technical field of building grouting lifting, and provides a method and system for judging safety of a raft during building grouting lifting, and the method comprises the steps: building an initial model representing a settled building based on a numerical modeling system, and obtaining an initial bending moment of the building raft based on the initial model; performing simulated grouting lifting on the settled building based on the initial model to obtain a post-lifting bending moment of a building raft; the coordinates of the position with the maximum initial bending moment and the coordinates of the position with the maximum bending moment after lifting are determined respectively, and then reinforcement data of the building raft at the coordinates of the position with the maximum initial bending moment and the coordinates of the position with the maximum bending moment after lifting are obtained; calculating the bearable critical bending moment of the building raft based on the reinforcement data; based on the initial bending moment, the post-lifting bending moment and the critical bending moment, whether the building raft is damaged or not before grouting lifting and after grouting lifting is judged through checking calculation. The safety of building grouting lifting can be guaranteed, and the construction efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of building grouting and lifting, and in particular to a method and system for determining the safety of a raft plate during building grouting and lifting. Background Art

[0002] With the increasing construction of high-rise buildings, various problems such as uneven settlement of building structures are becoming increasingly serious. Grouting correction technology has outstanding advantages in terms of correction effect, working space, and environmental factors. Among them, compaction grouting technology can effectively cause ground uplift, and has the advantages of being economical, efficient, and environmentally friendly. It is widely used in building tilt correction projects. However, since the grouting process is uncontrollable, it may cause certain damage to the building's foundation structure. However, due to the hidden internal structure of the raft foundation, it is impossible to intuitively determine whether the building's raft foundation has been damaged. Therefore, it is urgent to find relevant judgment methods as a reference. Summary of the Invention

[0003] The purpose of the present invention is to solve at least one technical problem in the background technology and to provide a method and system for determining the safety of a raft slab during grouting and lifting of a building.

[0004] To achieve the above objectives, the present invention provides a method for determining the safety of a raft slab during grouting and lifting of a building, characterized by comprising: Based on the numerical modeling system, an initial model representing the building that is experiencing settlement is established, and the initial bending moment of the building raft is obtained based on the initial model; Based on the initial model, the grouting uplift of the building that has settled is simulated to obtain the post-uplift bending moment of the building raft. Determine the coordinates of the maximum initial bending moment position and the maximum bending moment position after lifting respectively, and then obtain the reinforcement data of the building raft slab at the coordinates of the maximum initial bending moment position and the coordinates of the maximum bending moment position after lifting; Calculate the critical bending moment that the building raft can withstand based on reinforcement data; Based on the verification of initial bending moment, bending moment after lifting and critical bending moment, it is determined whether the raft slab of the building is damaged before and after grouting lifting.

[0005] According to one aspect of the present invention, the method of establishing an initial model representing a building that has undergone settlement based on a numerical modeling system and obtaining an initial bending moment of a raft slab of the building based on the initial model comprises: Based on geological survey data and building structure construction drawings, establish stratum and building models, input material property parameters, add loads and boundary conditions, and form an initial model; Based on the initial model, the initial bending moment M of the building raft in the X direction is obtained. X0 and the initial bending moment M in the Y direction Y0 .

[0006] According to one aspect of the present invention, the method of simulating the grouting and lifting of the settled building based on the initial model to obtain the post-lifting bending moment of the building raft includes: The volume expansion coefficient was set in the initial model to simulate the grouting uplift of the building; After simulating the grouting uplift, the post-uplift bending moment M of the building raft in the X direction is obtained. XT and the bending moment M after lifting in the Y direction YT .

[0007] According to one aspect of the present invention, the steps of respectively determining the coordinates of the position with the maximum initial bending moment and the coordinates of the position with the maximum bending moment after lifting, and then obtaining the reinforcement data of the building raft slab at the coordinates of the position with the maximum initial bending moment and the coordinates of the position with the maximum bending moment after lifting, comprise: Based on the initial bending moment, the maximum initial bending moment (M) in the X direction of the building raft is obtained. X0 ) max and the maximum initial bending moment in the Y direction (M Y0 ) max ; Based on the lifting bending moment, the maximum value of the lifting bending moment (M XT ) max and the maximum bending moment after lifting in the Y direction (M YT ) max ; Based on the maximum initial bending moment of the building raft in the X direction (M X0 ) max and the maximum initial bending moment in the Y direction (M Y0 ) max Determine the coordinates of the maximum initial bending moment position of the building raft; Based on the maximum bending moment after the building raft slab is lifted in the X direction (M XT ) max and the maximum bending moment after lifting in the Y direction (M YT ) max Determine the coordinates of the maximum bending moment position after the building raft is lifted; Based on the coordinates of the maximum initial bending moment position of the building raft slab and the coordinates of the maximum bending moment position of the building raft slab after lifting, find the reinforcement of the building raft slab at the corresponding coordinates in the foundation reinforcement drawing, and determine the types and cross-sectional areas of the compressive and tensile reinforcements of the building raft slab at different coordinates.

[0008] According to one aspect of the present invention, the calculation of the critical bending moment that a building raft slab can withstand based on reinforcement data includes: According to the reinforcement data of the building raft at different coordinates, the critical bending moment M that the building raft can withstand is calculated respectively. u , the critical bending moment M uis the initial critical bending moment M of the building raft in the X direction u(X0) , the initial critical bending moment M of the building raft in the Y direction u(Y0) , Critical bending moment M of the building raft in X direction after lifting u(XT) Or the critical bending moment M of the building raft in the Y direction after lifting u(YT) ; The critical bending moment M u The bending bearing capacity of the rectangular cross section is calculated using the following formulas (1) and (2): (1) (2) when When, take ; Where: is a coefficient. When the concrete strength grade does not exceed C50, it is taken as 1.0. When the concrete strength grade is C80, it is taken as 0.94. The values ​​in between are taken by linear interpolation. is the design value of concrete axial compressive strength; is the width of the raft section; is the height of the compression zone of the cross section; is the height of the raft section; are the distances from the compression reinforcement and tension reinforcement to the edge of the raft section respectively; is the effective height of the section, h0=h- ; are the cross-sectional areas of compression reinforcement and tension reinforcement respectively; are the design values ​​of tensile strength and compressive strength of steel bars respectively.

[0009] According to one aspect of the present invention, the verification and determination of whether a building raft slab is damaged before and after grouting and lifting based on the initial bending moment, the bending moment after lifting and the critical bending moment includes: Verify whether the building raft is damaged before grouting and lifting, including: When the initial bending moment M in the X direction X0 ≤ Initial critical bending moment M in X direction u(X0) And the initial bending moment M in the Y direction Y0 ≤ Initial critical bending moment M in Y direction u(Y0) When , the building raft is not damaged, otherwise, it is damaged; Verify whether the building raft is damaged after grouting and lifting, including: When the X-axis is lifted, the bending moment M XT ≤X-direction critical bending moment after lifting M u(XT) And the bending moment after lifting in Y direction M YT ≤Critical bending moment after lifting in Y direction M u(YT) When the load is too high, the raft slab of the building is not damaged, otherwise it is damaged.

[0010] To achieve the above object, the present invention further provides a system for determining the safety of a raft slab during grouting and lifting of a building, comprising: An initial bending moment acquisition module, based on a numerical modeling system, establishes an initial model representing the building that has undergone settlement, and obtains the initial bending moment of the building raft based on the initial model; The post-lift bending moment acquisition module simulates the grouting and lifting of the settled building based on the initial model to obtain the post-lift bending moment of the building raft; A reinforcement data acquisition module determines the coordinates of the maximum initial bending moment position and the maximum bending moment position after lifting, and then acquires the reinforcement data of the building raft slab at the coordinates of the maximum initial bending moment position and the coordinates of the maximum bending moment position after lifting; Critical bending moment calculation module, which calculates the critical bending moment that the building raft can withstand based on reinforcement data; The raft slab damage judgment module determines whether the building raft slab is damaged before and after grouting and lifting based on the initial bending moment, post-lifting bending moment and critical bending moment verification.

[0011] To achieve the above-mentioned purpose, the present invention also provides an electronic device, including a processor, a memory, and a computer program stored in the memory and capable of running on the processor. When the computer program is executed by the processor, the method for determining the safety of the raft slab during the grouting and lifting of the building as described above is implemented.

[0012] To achieve the above-mentioned purpose, the present invention also provides a computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the method for determining the safety of the raft slab during the grouting and lifting of the building as described above is implemented.

[0013] According to the solution of the present invention, the present invention simulates the interaction between the heterogeneous foundation and the raft slab through finite element numerical modeling software, and can accurately obtain the bending moment distribution of the entire area of ​​the raft slab, avoiding errors caused by simplified assumptions.

[0014] This method verifies the safety of raft structures by analyzing the cross-sectional reinforcement at the point of maximum bending moment and combining it with theoretical calculations. This analysis of key locations is more representative, making the verification process more concise and clear. It also provides a more scientific and intuitive tool for raft failure identification, providing a quantitative standard for the damage and stress of concealed foundation structures.

[0015] The present invention can ensure that the raft slab is in an undamaged state before grouting construction by checking the safety of the raft slab before grouting reinforcement and lifting, thereby avoiding the situation that the raft slab is damaged at a later time and the responsibility is unclear.

[0016] By checking the safety of the raft slab after grouting reinforcement and lifting, the present invention can adjust the reinforcement and lifting scheme at any time until the safety of the raft slab meets the safety requirements. This makes the actual construction process more controllable and the grouting technology more convincing, providing a solid guarantee for the safety of the building foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A flow chart schematically showing a method for determining the safety of a raft during grouting and lifting of a building according to an embodiment of the present invention; Figure 2 Schematic diagram of the maximum bending moment in the X direction of the initial model raft of Example 1; Figure 3 Schematic diagram of the maximum bending moment in the Y direction of the initial model raft of Example 1; Figure 4 Schematic diagram of the maximum bending moment in the X direction of the model raft after lifting in Example 1; Figure 5 Schematic diagram of the maximum bending moment in the Y direction of the model raft after lifting in Example 1; Figure 6 Schematic diagram of reinforcement of the raft slab at coordinate m in Example 1; Figure 7 Schematic diagram of reinforcement arrangement of the raft slab at coordinate n in Example 1; Figure 8 Schematic diagram of cross-section reinforcement during calculation of X-direction bending moment in Example 1; Figure 9 Schematic diagram of cross-section reinforcement when calculating the Y-direction bending moment in Example 1. DETAILED DESCRIPTION

[0018] 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.

[0019] 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."

[0020] Figure 1The flowchart schematically shows a method for determining the safety of a raft during grouting and lifting of a building according to an embodiment of the present invention. Figure 1 As shown, in this embodiment, the method for determining the safety of the raft slab during grouting and lifting of the building includes: Based on the numerical modeling system, an initial model representing the building that is experiencing settlement is established, and the initial bending moment of the building raft is obtained based on the initial model; Based on the initial model, the grouting uplift of the building that has settled is simulated to obtain the post-uplift bending moment of the building raft. Determine the coordinates of the maximum initial bending moment position and the maximum bending moment position after lifting respectively, and then obtain the reinforcement data of the building raft slab at the coordinates of the maximum initial bending moment position and the coordinates of the maximum bending moment position after lifting; Calculate the critical bending moment that the building raft can withstand based on reinforcement data; Based on the verification of initial bending moment, bending moment after lifting and critical bending moment, it is determined whether the raft slab of the building is damaged before and after grouting lifting.

[0021] Furthermore, according to one embodiment of the present invention, an initial model representing a building that has undergone settlement is established based on a numerical modeling system, and an initial bending moment of a raft slab of the building is obtained based on the initial model, including: Based on geological survey data and building structure construction drawings, establish stratum and building models, input material property parameters, add loads and boundary conditions, and form an initial model; Based on the initial model, the initial bending moment M of the building raft in the X direction is calculated. X0 and the initial bending moment M in the Y direction Y0 That is, check the BENDING MOMENT XX and BENDING MOMENT YY bending moment diagram options in the calculation results, and then obtain the initial bending moments M of the building raft in the X and Y directions respectively. X0 and M Y0 .

[0022] Furthermore, according to one embodiment of the present invention, a simulated grouting and lifting process is performed on a settled building based on the initial model to obtain the post-lifting bending moment of the building raft, including: The volume expansion coefficient was set in the initial model to simulate the grouting uplift of the building; After simulating the grouting uplift, the post-uplift bending moment M of the building raft in the X direction is calculated. XT and the bending moment M after lifting in the Y direction YT That is, check the BENDING MOMENT XX and BENDING MOMENT YY options in the calculation results to obtain the lifting bending moments M of the raft in the X and Y directions respectively. XT and M YT.

[0023] The above BENDING MOMENT XX is the bending moment per unit width in the plane perpendicular to the x-axis of the unit coordinate system and rotating around the y-axis. The BENDING MOMENT YY is the bending moment per unit width in the plane perpendicular to the y-axis of the unit coordinate system and rotating around the x-axis.

[0024] Further, according to an embodiment of the present invention, respectively determining the coordinates of the position of maximum initial bending moment and the coordinates of the position of maximum bending moment after lifting, and then obtaining the reinforcement data of the building raft slab at the coordinates of the position of maximum initial bending moment and the coordinates of the position of maximum bending moment after lifting, comprises: Based on the initial bending moment, the maximum initial bending moment (M) in the X direction of the building raft is obtained. X0 ) max and the maximum initial bending moment in the Y direction (M Y0 ) max ; Based on the lifting bending moment, the maximum value of the lifting bending moment (M XT ) max and the maximum bending moment after lifting in the Y direction (M YT ) max ; Based on the maximum initial bending moment of the building raft in the X direction (M X0 ) max and the maximum initial bending moment in the Y direction (M Y0 ) max Determine the coordinates of the maximum initial bending moment position of the building raft; Based on the maximum bending moment after the building raft slab is lifted in the X direction (M XT ) max and the maximum bending moment after lifting in the Y direction (M YT ) max Determine the coordinates of the maximum bending moment position after the building raft is lifted; Based on the coordinates of the maximum initial bending moment position of the building raft slab and the coordinates of the maximum bending moment position of the building raft slab after lifting, find the reinforcement of the building raft slab at the corresponding coordinates in the foundation reinforcement drawing, and determine the types and cross-sectional areas of the compressive and tensile reinforcements of the building raft slab at different coordinates.

[0025] Furthermore, according to one embodiment of the present invention, the critical bending moment that a building raft slab can withstand is calculated based on reinforcement data, including: According to the reinforcement data of the building raft at different coordinates, the critical bending moment M that the building raft can withstand is calculated respectively. u , the critical bending moment M u is the initial critical bending moment M of the building raft in the X direction u(X0) , the initial critical bending moment M of the building raft in the Y direction u(Y0), Critical bending moment M of the building raft in X direction after lifting u(XT) Or the critical bending moment M of the building raft in the Y direction after lifting u(YT) ; Critical bending moment M u The bending bearing capacity of the rectangular cross section is calculated using the following formulas (1) and (2): (1) (2) when When, take ; Where: is a coefficient. When the concrete strength grade does not exceed C50, it is taken as 1.0. When the concrete strength grade is C80, it is taken as 0.94. The values ​​in between are taken by linear interpolation. is the design value of concrete axial compressive strength; is the width of the raft section; is the height of the compression zone of the cross section; is the height of the raft section; are the distances from the compression reinforcement and tension reinforcement to the edge of the raft section respectively; is the effective height of the section, h0=h- ; are the cross-sectional areas of compression reinforcement and tension reinforcement respectively; are the design values ​​of tensile strength and compressive strength of steel bars respectively.

[0026] Furthermore, according to one embodiment of the present invention, whether damage occurs to the building raft slab before and after grouting and lifting is determined based on the initial bending moment, the bending moment after lifting, and the critical bending moment verification, including: Verify whether the building raft is damaged before grouting and lifting, including: When the initial bending moment M in the X direction X0 ≤ Initial critical bending moment M in X direction u(X0) And the initial bending moment M in the Y direction Y0 ≤ Initial critical bending moment M in Y direction u(Y0) When , the building raft is not damaged, otherwise, it is damaged; In this embodiment, by verifying the safety of the raft slab before grouting and lifting, it is possible to ensure that the raft slab is in an undamaged state before the grouting and lifting construction, thereby avoiding the possibility of raft slab damage being discovered later and unclear responsibilities. If the raft slab is found to be potentially damaged, it should be confirmed whether the conditions are met for construction.

[0027] Verify whether the building raft is damaged after grouting and lifting, including: When the X-axis is lifted, the bending moment M XT ≤X-direction critical bending moment after lifting M u(XT) And the bending moment after lifting in Y direction M YT ≤Critical bending moment after lifting in Y direction M u(YT) When the load is too high, the raft slab of the building is not damaged, otherwise it is damaged.

[0028] In this embodiment, if the raft is found to be potentially damaged, the lifting plan needs to be adjusted immediately, for example: Step 1: Increase the number of grouting holes at the possible damage location of the raft slab and its surrounding areas, reduce the grouting pressure, apply pressure in stages, and slowly and precisely lift to avoid stress concentration caused by the grouting pressure of a single grouting hole. The above adjustments are reflected in the model, that is, at the damage location of the raft slab, the horizontal range of the applied expansion rate of the corresponding soil is increased, and the applied expansion rate value is reduced. After the model is modified, continue the model calculation to obtain the new bending moment M after lifting. XT and M YT , and then go with M u(XT) 、M u(YT) Compare and see if there will be damage to the raft slab. Gradually increase the number of grouting holes and reduce the grouting pressure. When the raft slab still shows damage, proceed to the second step. The second step is to increase the depth of the soil layer lifting position, so that there is enough soil layer thickness above the grouting lifting to serve as a protective layer for the raft. This provides a transmission medium for the transmission of the grouting lifting force and better ensures the lifting effect. In the model, the position where the soil layer is applied with the expansion rate is deepened to increase the vertical distance between it and the raft. Then, the model calculation is performed to obtain the new bending moment M after lifting. XT and M YT , and then go with M u(XT) 、M u(YT) Compare and see whether there will be damage to the raft. Generally, as the depth increases, there will always be a position where the building can be lifted without causing the raft to bend too much.

[0029] According to the above solution of the present invention, the present invention simulates the interaction between the heterogeneous foundation and the raft through finite element numerical modeling software, and can accurately obtain the bending moment distribution of the entire area of ​​the raft, avoiding errors caused by simplified assumptions.

[0030] This method verifies the safety of raft structures by analyzing the cross-sectional reinforcement at the point of maximum bending moment and combining it with theoretical calculations. This analysis of key locations is more representative, making the verification process more concise and clear. It also provides a more scientific and intuitive tool for raft failure identification, providing a quantitative standard for the damage and stress of concealed foundation structures.

[0031] The present invention can ensure that the raft slab is in an undamaged state before grouting construction by checking the safety of the raft slab before grouting reinforcement and lifting, thereby avoiding the situation that the raft slab is damaged at a later time and the responsibility is unclear.

[0032] By checking the safety of the raft slab after grouting reinforcement and lifting, the present invention can adjust the reinforcement and lifting scheme at any time until the safety of the raft slab meets the safety requirements. This makes the actual construction process more controllable and the grouting technology more convincing, providing a solid guarantee for the safety of the building foundation.

[0033] Furthermore, to achieve the above-mentioned object, the present invention also provides a system for determining the safety of a raft slab during grouting and lifting of a building, comprising: An initial bending moment acquisition module, based on a numerical modeling system, establishes an initial model representing the building that has undergone settlement, and obtains the initial bending moment of the building raft based on the initial model; The post-lift bending moment acquisition module simulates the grouting and lifting of the settled building based on the initial model to obtain the post-lift bending moment of the building raft; A reinforcement data acquisition module determines the coordinates of the maximum initial bending moment position and the maximum bending moment position after lifting, and then acquires the reinforcement data of the building raft slab at the coordinates of the maximum initial bending moment position and the coordinates of the maximum bending moment position after lifting; Critical bending moment calculation module, which calculates the critical bending moment that the building raft can withstand based on reinforcement data; The raft slab damage judgment module determines whether the building raft slab is damaged before and after grouting and lifting based on the initial bending moment, post-lifting bending moment and critical bending moment verification.

[0034] The system for determining the safety of a raft slab during grouting and lifting of a building according to the present invention can implement the method for determining the safety of a raft slab during grouting and lifting of a building. The specific process steps are as described above and will not be repeated here.

[0035] Furthermore, to achieve the above-mentioned purpose, the present invention also provides an electronic device, comprising a processor, a memory, and a computer program stored in the memory and runnable on the processor. When the computer program is executed by the processor, the method for determining the safety of the raft slab during the grouting and lifting of the building as described above is implemented.

[0036] Furthermore, to achieve the above-mentioned purpose, the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method for determining the safety of a raft during grouting and lifting of a building as described above is implemented.

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiment described herein is only an optimal embodiment of the present invention and is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] Example 1 A residential building project, with 11 floors above ground, features a shear wall structure and a raft foundation. The foundation depth is -4.60m. The building is 63.65m long, 11.35m wide, and 32.45m high. It consists of three units, with expansion joints installed in units 1 and 2. The building structure is a shear wall structure, and the foundation is a 900mm thick raft foundation, 65.05m long, and 9.4m wide. The raft top elevation is -4.000m, and the raft bottom elevation is -4.600m. ±0.000 corresponds to an absolute elevation of 1745.800. The foundation soil is primarily collapsible loess. Heavy rains have caused the foundation to saturate, resulting in subsidence and uneven settlement, with a maximum tilt of 6.17‰ (towards the north).

[0039] For the above-mentioned specific settlement problem, this embodiment adopts the following determination method to determine the safety of the raft during the grouting and lifting of the building: Step 1: Numerical simulation to obtain the raft bending moment: Based on geological survey data, building structure construction drawings and other information, an initial model is established and calculated to obtain the initial bending moments M in the X and Y directions of the raft. X0 and M Y0 Based on the initial model, grouting and lifting were carried out. In the area with larger settlement on the east side, the volume expansion coefficient ε = 10% was set to form a lifting model and calculation was performed to obtain the lifting bending moments M in the X and Y directions of the raft slab. XT and M YT .

[0040] Step 2: Determine the reinforcement at the position of maximum bending moment of the raft slab: Based on the bending moment of the raft slab obtained from the numerical simulation results, the maximum bending moment can be obtained: (M X0 ) max =-600.6531kN·m / m, (M Y0 ) max =-568.0371kN·m / m, (M XT ) max=-550.3480kN·m / m, (M YT ) max =-663.5661kN·m / m, such as Figure 2 、 Figure 3 、 Figure 4 and Figure 5 Determine the coordinates of the maximum position of each bending moment of the raft plate, where (M X0 ) max The corresponding coordinate point is m, (M Y0 ) max The corresponding coordinate point is m, (M XT ) max The corresponding coordinate point is n, (M YT ) max The corresponding coordinate point is m. According to the structural construction drawings, the reinforcement of the raft slab at the coordinates of points m and n is as follows: Figure 6 、 Figure 7 As shown. The raft reinforcement model and cross-sectional area As, As' at the m and n coordinates are shown in Figure 8 、 Figure 9 shown.

[0041] Step 3: Calculate the critical bending moment Mu that the raft slab can withstand based on the reinforcement: Calculate the critical bending moment Mu based on the following rectangular section bending bearing capacity formulas (1) and (2).

[0042] By checking construction drawings, geological survey data, and specifications, we can obtain: ; ; As (5 steel bars with a diameter of 14 mm + 4 steel bars with a diameter of 16 mm) = 1574 mm 2 As (5 steel bars with a diameter of 14 mm + 4 steel bars with a diameter of 12 mm) = 1222 mm 2 As (5 steel bars with a diameter of 14 mm) = 769 mm 2 As' (5 steel bars with a diameter of 14 mm) = 769 mm 2 ; ; The calculation process includes: 1. The calculation of Mu corresponding to the X-direction reinforcement of the m-coordinate is as follows: ,Pick ; ; 2. The calculation of Mu corresponding to the Y-direction reinforcement of the m-coordinate is as follows: ,Pick ; ; 3. The calculation of Mu corresponding to the X-direction reinforcement of the n coordinate is as follows: ,Pick ; .

[0043] Step 4: Check whether the bending moment will damage the raft slab: According to M X0 and M u(X0) 、M Y0 and M u(Y0) Verify whether the raft slab is damaged before grouting reinforcement and lifting. and If both conditions are met at the same time, it means that the raft slab has not been damaged after settlement and grouting construction can be carried out normally.

[0044] According to M XT and M u(XT) 、M YT and M u(YT) Verify whether the raft is damaged after grouting reinforcement and lifting. and If both conditions are met at the same time, it means that the raft slab has not been damaged after the construction is completed and the construction technology is safe and reliable.

[0045] Those skilled in the art will appreciate that the modules and algorithm steps described in conjunction with the embodiments disclosed herein can be implemented using electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0046] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and equipment can refer to the corresponding processes in the aforementioned method implementation methods and will not be repeated here.

[0047] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules is merely a logical function division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0048] The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

[0049] In addition, each functional module in the embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0050] If the functions are implemented as software modules and sold or used as standalone products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the energy-saving signal transmission / reception method according to various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard drive, ROM, RAM, a magnetic disk, or an optical disk.

[0051] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0052] It should be understood that the size of the serial numbers of each step in the content of the invention and the implementation methods of the present invention does not absolutely mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the implementation methods of the present invention.

Claims

1. A method for determining the safety of a raft slab during grouting and lifting of a building, characterized in that: include: Based on the numerical modeling system, an initial model representing the building that is experiencing settlement is established, and the initial bending moment of the building raft is obtained based on the initial model; Based on the initial model, the grouting uplift of the building that has settled is simulated to obtain the post-uplift bending moment of the building raft. Determine the coordinates of the maximum initial bending moment position and the maximum bending moment position after lifting respectively, and then obtain the reinforcement data of the building raft slab at the coordinates of the maximum initial bending moment position and the coordinates of the maximum bending moment position after lifting; Calculate the critical bending moment that the building raft can withstand based on reinforcement data; Based on the verification of initial bending moment, bending moment after lifting and critical bending moment, it is determined whether the raft slab of the building is damaged before and after grouting lifting.

2. The method for determining the safety of a raft during grouting and lifting of a building according to claim 1, wherein: The method of establishing an initial model representing a building that has undergone settlement based on a numerical modeling system and obtaining an initial bending moment of a raft slab of the building based on the initial model includes: Based on geological survey data and building structure construction drawings, establish stratum and building models, input material property parameters, add loads and boundary conditions, and form an initial model; Based on the initial model, the initial bending moment M of the building raft in the X direction is obtained. X0 and the initial bending moment M in the Y direction Y0 .

3. The method for determining the safety of a raft slab during grouting and lifting of a building according to claim 2, wherein: The method of simulating grouting and lifting of the settled building based on the initial model to obtain the post-lifting bending moment of the building raft includes: The volume expansion coefficient was set in the initial model to simulate the grouting uplift of the building; After simulating the grouting uplift, the post-uplift bending moment M of the building raft in the X direction is obtained. XT and the bending moment M after lifting in the Y direction YT .

4. The method for determining the safety of a raft slab during grouting and lifting of a building according to claim 3, wherein: The method of respectively determining the coordinates of the position of maximum initial bending moment and the coordinates of the position of maximum bending moment after lifting, and then obtaining the reinforcement data of the building raft slab at the coordinates of the position of maximum initial bending moment and the coordinates of the position of maximum bending moment after lifting, comprises: Based on the initial bending moment, the maximum initial bending moment (M) in the X direction of the building raft is obtained. X0 ) max and the maximum initial bending moment in the Y direction (M Y0 ) max ; Based on the lifting bending moment, the maximum value of the lifting bending moment (M XT ) max and the maximum bending moment after lifting in the Y direction (M YT ) max ; Based on the maximum initial bending moment of the building raft in the X direction (M X0 ) max and the maximum initial bending moment in the Y direction (M Y0 ) max Determine the coordinates of the maximum initial bending moment position of the building raft; Based on the maximum bending moment after the building raft slab is lifted in the X direction (M XT ) max and the maximum bending moment after lifting in the Y direction (M YT ) max Determine the coordinates of the maximum bending moment position after the building raft is lifted; Based on the coordinates of the maximum initial bending moment position of the building raft slab and the coordinates of the maximum bending moment position of the building raft slab after lifting, find the reinforcement of the building raft slab at the corresponding coordinates in the foundation reinforcement drawing, and determine the types and cross-sectional areas of the compressive and tensile reinforcements of the building raft slab at different coordinates.

5. The method for determining the safety of a raft slab during grouting and lifting of a building according to claim 4, wherein: The calculation of the critical bending moment that the building raft slab can withstand based on the reinforcement data includes: According to the reinforcement data of the building raft at different coordinates, the critical bending moment M that the building raft can withstand is calculated respectively. u , the critical bending moment M u is the initial critical bending moment M of the building raft in the X direction u(X0) , the initial critical bending moment M of the building raft in the Y direction u(Y0) , Critical bending moment M of the building raft in X direction after lifting u(XT) Or the critical bending moment M of the building raft in the Y direction after lifting u(YT) ; The critical bending moment M u The bending bearing capacity of the rectangular cross section is calculated using the following formulas (1) and (2): （1） （2） when When, take ; Where: is a coefficient. When the concrete strength grade does not exceed C50, it is taken as 1.

0. When the concrete strength grade is C80, it is taken as 0.

94. The values ​​in between are taken by linear interpolation. is the design value of concrete axial compressive strength; is the width of the raft section; is the height of the compression zone of the cross section; is the height of the raft section; are the distances from the compression reinforcement and tension reinforcement to the edge of the raft section respectively; is the effective height of the section, h0=h- ; are the cross-sectional areas of compression reinforcement and tension reinforcement respectively; are the design values ​​of tensile strength and compressive strength of steel bars respectively.

6. The method for determining the safety of a raft slab during grouting and lifting of a building according to claim 5, wherein: The verification based on the initial bending moment, the bending moment after lifting and the critical bending moment to determine whether the building raft slab is damaged before and after grouting and lifting includes: Verify whether the building raft is damaged before grouting and lifting, including: When the initial bending moment M in the X direction X0 ≤ Initial critical bending moment M in X direction u(X0) And the initial bending moment M in the Y direction Y0 ≤ Initial critical bending moment M in Y direction u(Y0) When , the building raft is not damaged, otherwise, it is damaged; Verify whether the building raft is damaged after grouting and lifting, including: When the X-axis is lifted, the bending moment M XT ≤X-direction critical bending moment after lifting M u(XT) And the bending moment after lifting in Y direction M YT ≤Critical bending moment after lifting in Y direction M u(YT) When the load is too high, the raft slab of the building is not damaged, otherwise it is damaged.

7. A system for determining the safety of raft slabs during grouting and lifting of buildings, characterized by: include: An initial bending moment acquisition module, based on a numerical modeling system, establishes an initial model representing the building that has undergone settlement, and obtains the initial bending moment of the building raft based on the initial model; The post-lift bending moment acquisition module simulates the grouting and lifting of the settled building based on the initial model to obtain the post-lift bending moment of the building raft; A reinforcement data acquisition module determines the coordinates of the maximum initial bending moment position and the maximum bending moment position after lifting, and then acquires the reinforcement data of the building raft slab at the coordinates of the maximum initial bending moment position and the coordinates of the maximum bending moment position after lifting; Critical bending moment calculation module, which calculates the critical bending moment that the building raft can withstand based on reinforcement data; The raft slab damage judgment module determines whether the building raft slab is damaged before and after grouting and lifting based on the initial bending moment, post-lifting bending moment and critical bending moment verification.

8. An electronic device, characterized in that The method comprises a processor, a memory and a computer program stored in the memory and executable on the processor, wherein when the computer program is executed by the processor, the method for determining the safety of a raft during grouting and lifting of a building as described in any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for determining the safety of a raft during grouting and lifting of a building according to any one of claims 1 to 6 is implemented.

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