Deep foundation pit safety assessment method and device, computer storage medium and terminal

Abstract

According to the deep foundation pit safety assessment method and device, the computer storage medium and the terminal, compared with a method for setting a threshold value depending on historical experience, the deformation curve of the diaphragm wall obtained on the basis of the inclinometry data of the diaphragm wall measured on site has the advantages that the physical and mechanical basis and interpretability are better, and the safety of the deep foundation pit is improved. A more scientific and accurate safety assessment basis is provided for foundation pit construction; the curvature of the deformation curve obtained through conversion can oscillate at the end part of the interface, so that the fitting is inaccurate, and the problem of inaccurate fitting is avoided through end part removal treatment; the curvature change of the underground diaphragm wall deformation curve is used as an index to analyze the deformation characteristics of the underground diaphragm wall, and compared with a safety evaluation method which depends on settlement indexes in the related technology, the curvature change is more sensitive, the deformation characteristics of the foundation pit support structure are reflected more accurately, safety evaluation information is provided for finding potential hidden dangers earlier, and the safety evaluation efficiency is improved. The timeliness and accuracy of monitoring deep foundation pit construction safety early warning are improved, and the safety risk of deep foundation pit construction is reduced.

Description

Technical Field

[0001] This document relates to underground engineering technology, especially a method, device, computer storage medium and terminal for safety assessment of deep foundation pits. Background Art

[0002] With the acceleration of China's urbanization process, the urbanization level has been continuously improved, and land resources have gradually become tense. To meet the needs of the rapid development of cities, the development of underground space has become an important construction direction; especially in the construction of the rail transit system in large cities, the subway, as the core component, has become an important factor in promoting the urban transportation network and improving the travel of citizens; as of December 2023, a total of 55 cities in the country have opened and operated 306 urban rail transit lines, with an operating mileage of 10,165.7 kilometers. However, with the rapid progress of underground rail transit, the excavation projects of subway deep foundation pits (a deep foundation pit refers to a project with an excavation depth exceeding 5 meters (including 5 meters), or a project that needs special treatment due to the complexity of geological conditions, surrounding environment and underground pipelines despite the depth not exceeding 5 meters) have gradually increased. Especially in urban dense areas, foundation pit construction faces more complex environments and risks. Especially during the excavation process of deep foundation pits, how to ensure the safety of foundation pit construction and prevent accidents caused by foundation pit deformation has become an important problem in modern underground engineering construction.

[0003] At present, the construction process of foundation pits mainly relies on a variety of threshold indicators for safety assessment, including ground settlement, building settlement, column settlement, diaphragm wall inclinometer, and support axial force, etc. The following is a brief description of the above safety assessment indicators. Among them, ground settlement is one of the common monitoring indicators during the foundation pit excavation process. By setting ground settlement points and using equipment such as level gauges for real-time monitoring, according to the monitoring data, combined with factors such as construction depth and soil properties, the settlement trend is analyzed. By monitoring the ground settlement situation around the foundation pit, it can be judged whether the foundation pit construction is normal and whether there are risks affecting the safety of the surrounding environment. The buildings around the foundation pit may be affected by the foundation pit construction, especially when the foundation pit is close to the building. The settlement situation of the building directly affects the safety and service function of the building. Monitoring the building settlement can provide a dynamic assessment of the impact of the foundation pit on the safety of the surrounding buildings. By setting settlement monitoring points on the surrounding buildings, regularly measuring the building settlement amount, and analyzing it in combination with factors such as the construction progress and depth of the foundation pit. The monitoring tools usually include total station, settlement gauge, and laser level gauge, etc. Column settlement refers to the settlement amount of columns in the foundation pit. Columns play a vertical support role in the foundation pit construction, and their settlement may affect the stability of the support structure, thereby affecting the safety of the foundation pit. Usually, settlement sensors are installed on the columns to monitor their height changes in real time. By comparing the actual settlement amount with the designed settlement value, it can be judged whether there are risks of excessive deformation or instability of the support structure. As an important part of the foundation pit enclosure structure, the deformation of the diaphragm wall is crucial for the stability of the foundation pit. Diaphragm wall inclinometer refers to evaluating the deformation situation by measuring the inclination of the diaphragm wall. The deformation, inclination, or damage of the diaphragm wall is often a precursor to the instability of the foundation pit. The stability of the diaphragm wall is directly related to the safety of the foundation pit and the surrounding buildings. The inclinometer is used to regularly measure the inclination angle of the diaphragm wall. Usually, the inclinometer is installed at multiple monitoring points inside or outside the diaphragm wall. By analyzing the data changes, the inclination angle and lateral deformation of the diaphragm wall are calculated and dynamically analyzed. Support axial force refers to the force borne by the support structure during the foundation pit construction. The support system plays a role of support and reinforcement during the foundation pit excavation process to ensure the stability of the diaphragm wall. By monitoring the change of the support axial force, it can effectively reflect whether there is an overload phenomenon in the support structure, and then judge whether there is a risk of instability in the foundation pit. By installing equipment such as axial force sensors and strain gauges, the force borne by the support structure is monitored in real time. If the axial force is too large, it indicates that the support structure is abnormally stressed, which may lead to structural deformation or even failure.

[0004] The current safety assessment methods for deep foundation pits of subways have the following defects: 1) Settlement - related indicators (such as ground settlement, building settlement, column settlement, etc.) can only reflect the overall deformation situation inside and around the foundation pit, and cannot accurately reflect the local deformation of underground structures (such as diaphragm walls); since the settlement is affected by construction with a certain lag, it is sometimes difficult to timely warn of potential risks; in addition, the settlement amount is difficult to be theoretically deduced by mechanical formulas, and the threshold is mainly set based on historical construction experience, with weak interpretability; 2) The inclinometer index of the diaphragm wall can directly reflect the deformation characteristics of the foundation pit retaining structure, but it is very difficult to determine the inclinometer threshold, which is usually set according to the results of numerical simulation or engineering experience; in actual engineering, there may be situations where the inclinometer exceeds the limit but the foundation pit does not collapse, and it is difficult to make a trade - off and balance between efficiency and safety at this time; 3) The support axial force has a clear mechanical meaning and is a direct indicator for observing the internal force of the foundation pit structure; however, the current monitoring and calculation methods of the support axial force have great uncertainties; on the one hand, if the support axial force is calculated by pasting strain gauges on the concrete surface, there are often problems such as large fluctuations and inaccuracies in the measurement results; on the other hand, currently, the support is regarded as a one - dimensional stressed member, lacking consideration of bending moment, so there are errors in the safety assessment results. To sum up, the safety assessment methods for deep foundation pits of subways in related technologies have many limitations and cannot meet the requirements for accurate assessment of foundation pit safety in complex construction environments. How to realize the safety assessment of deep foundation pits of subways has become a problem to be solved. Summary of the Invention

[0005] An embodiment of the present application provides a method for safety assessment of a deep foundation pit, including: Converting the measured inclinometer data of the diaphragm wall to obtain the deformation curve of the diaphragm wall; Performing end - removal processing on the curvature of the converted deformation curve in a preset manner; Analyzing the deformation characteristics of the diaphragm wall along the depth direction according to the curvature of the deformation curve after end - removal.

[0006] On the other hand, an embodiment of the present application also provides a computer storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the above - mentioned method for safety assessment of a deep foundation pit is realized.

[0007] On yet another aspect, an embodiment of the present application also provides a terminal, including: a memory and a processor, and a computer program is stored in the memory; wherein, The processor is configured to execute the computer program in the memory; When the computer program is executed by the processor, the above - mentioned method for safety assessment of a deep foundation pit is realized.

[0008] On the other hand, an embodiment of the present application further provides a device for deep foundation pit safety assessment, including: a conversion unit, an end processing unit, and an analysis unit; wherein, The conversion unit is configured to: convert and obtain a deformation curve of the diaphragm wall according to the inclinometer data of the diaphragm wall measured on site; The end processing unit is configured to: perform end removal processing on the curvature of the converted deformation curve in a preset manner; The analysis unit is configured to: analyze the deformation characteristics of the diaphragm wall along the depth direction according to the curvature of the deformation curve after end removal.

[0009] The deformation curve of the diaphragm wall obtained based on the inclinometer data of the diaphragm wall measured on site in the embodiment of the present disclosure is more physically and mechanically based and interpretable compared with the method of setting thresholds relying on historical experience in the related art, and can provide a more scientific and accurate safety assessment basis for foundation pit construction; the curvature of the converted deformation curve will oscillate at the interface end, resulting in inaccurate fitting. The problem of inaccurate fitting of the deformation curve is avoided through end removal processing; analyzing the deformation characteristics of the diaphragm wall with the change of the curvature of the diaphragm wall deformation curve is more sensitive compared with the safety assessment method relying on settlement - type indicators in the related art, and can more accurately reflect the deformation characteristics of the foundation pit retaining structure, provide safety assessment information for earlier detection of potential hidden dangers, improve the timeliness and accuracy of monitoring the safety warning of deep foundation pit construction, and reduce the safety risk of deep foundation pit construction.

[0010] Other features and advantages of the present application will be described in the subsequent description, and part of them will become obvious from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained through the solutions described in the description and the drawings. Description of the Drawings

[0011] The drawings are used to provide an understanding of the technical solutions of the present application, and constitute a part of the description. They are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation to the technical solutions of the present application.

[0012] Figure 1 It is a flowchart of the method for deep foundation pit safety assessment in the embodiment of the present disclosure; Figure 2 It is a schematic diagram of the end processing of the deformation curve in the embodiment of the present disclosure; Figure 3 It is a flowchart of calculating the yield curvature based on the fiber beam model in the embodiment of the present disclosure; Figure 4 It is a schematic diagram of the relationship between bending moment and curvature in the embodiment of the present disclosure; Figure 5 It is a structural block diagram of the device for deep foundation pit safety assessment in the embodiment of the present disclosure. Detailed implementation manners

[0013] This application describes multiple embodiments, but the description is exemplary rather than restrictive, and it will be obvious to those of ordinary skill in the art that there can be more embodiments and implementation solutions within the scope covered by the embodiments described in this application. Although many possible feature combinations are shown in the drawings and discussed in the detailed implementation manners, many other combination ways of the disclosed features are also possible. Unless specifically restricted, any feature or element of any embodiment can be combined with any other feature or element in any other embodiment, or can replace any other feature or element in any other embodiment.

[0014] This application includes and contemplates combinations with features and elements known to those of ordinary skill in the art. The embodiments, features, and elements already disclosed in this application can also be combined with any conventional features or elements to form a unique inventive solution. Any feature or element of any embodiment can also be combined with features or elements from other inventive solutions to form another unique inventive solution. Therefore, it should be understood that any feature shown and / or discussed in this application can be implemented alone or in any suitable combination. Therefore, except for the limitations made according to the appended claims and their equivalent replacements, the embodiments are not subject to other limitations. In addition, various modifications and changes can be made within the scope of protection of the appended claims.

[0015] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not depend on the specific sequence of steps described herein, the method or process should not be limited to the specific sequence of steps described. As will be understood by those of ordinary skill in the art, other step sequences are possible. Therefore, the specific sequence of steps set forth in the specification should not be construed as a limitation on the claims. In addition, the claims directed to the method and / or process should not be limited to performing their steps in the order written, and those skilled in the art can easily understand that these sequences can be varied and still remain within the spirit and scope of the embodiments of this application.

[0016] Figure 1 is a flowchart of the method for safety assessment of deep foundation pits in the embodiments of the present disclosure. As Figure 1 shown, it includes: Step 101: Convert the inclinometer data of the diaphragm wall measured on-site to obtain the deformation curve of the diaphragm wall; Step 102: Perform end removal processing on the curvature of the obtained deformation curve in a preset manner; Step 103: Analyze the deformation characteristics of the diaphragm wall along the depth direction according to the curvature of the deformation curve after end removal.

[0017] In the embodiment of the present disclosure, the deformation curve of the diaphragm wall obtained based on the inclinometer data measured on site has a more physical and mechanical basis and interpretability compared with the method of setting thresholds relying on historical experience in the related art, and can provide a more scientific and accurate basis for safety assessment of foundation pit construction; the curvature of the converted deformation curve will oscillate at the interface end, resulting in inaccurate fitting. The problem of inaccurate fitting of the deformation curve is avoided through end removal processing; the deformation characteristics of the diaphragm wall are analyzed with the curvature change of the diaphragm wall deformation curve as an index. Compared with the safety assessment method in the related art that relies on settlement - type indicators, the curvature change is more sensitive and can more accurately reflect the deformation characteristics of the foundation pit retaining structure, providing safety assessment information for earlier detection of potential hidden dangers, improving the timeliness and accuracy of monitoring the safety warning of deep foundation pit construction, and reducing the safety risk of deep foundation pit construction.

[0018] In the embodiment of the present disclosure, a deep foundation pit refers to a project with an excavation depth exceeding 5 meters (including 5 meters), or a project that requires special treatment due to the complexity of geological conditions, surrounding environment, and underground pipelines although the depth does not exceed 5 meters.

[0019] The inclinometer data of the diaphragm wall in the embodiment of the present disclosure can be measured on site. For example, the horizontal displacements of each point can be obtained through an inclinometer or a displacement sensor and depth , and these data points can be expressed as: ; where, is the depth of the measurement point (from the top of the diaphragm wall to a certain position of the wall); is the horizontal displacement corresponding to the measurement point.

[0020] In an exemplary example, in the embodiment of the present disclosure, according to the inclinometer data of the diaphragm wall measured on site, the deformation curve of the diaphragm wall is converted, including: According to the inclinometer data, use the polynomial fitting method or spline interpolation method to obtain the deformation curve of the diaphragm wall.

[0021] In order to convert the discrete inclinometer data into a continuous deformation curve, the embodiment of the present disclosure uses the polynomial fitting method to obtain the deformation curve, and the expression of the fitting function can be: ; where, is the order of the polynomial, generally selected according to the data distribution and fitting effect, usually selected as 5 - 8; is the coefficient of the fitted polynomial, determined by the least - squares method, represents the depth of the point of the inclinometer data.

[0022] After fitting, the deformation curve The curvature can be calculated by the following formula: (1) In the formula, is the first derivative of the horizontal displacement with respect to the depth, representing the change in the inclination angle of the diaphragm wall; is the second derivative of the horizontal displacement with respect to the depth, representing the bending change of the diaphragm wall.

[0023] In an exemplary example, the embodiments of the present disclosure perform end removal processing on the curvature of the obtained deformation curve in a preset manner, including: Performing a process of intercepting and removing a preset length at both ends of the curvature of the obtained deformation curve; or, Determining the maximum extreme point and the minimum extreme point of the curvature of the deformation curve, intercepting and retaining the internal region between the maximum extreme point and the minimum extreme point, and removing the ends except the internal region.

[0024] In an exemplary example, the embodiments of the present disclosure can plot the distribution result of the curvature of the deformation curve as a curve graph, and analyze the deformation characteristics of the diaphragm wall along the depth direction through the curve graph.

[0025] When obtaining the deformation curve of the diaphragm wall, the curvature of the deformation curve may exhibit oscillation phenomena at the ends (top or bottom) of the cross-section, and this oscillation effect will lead to inaccurate fitting results; Figure 2 This is a schematic diagram of the processing of the deformation curve of the embodiments of the present disclosure. As Figure 2 shown, the embodiments of the present disclosure adopt the method of removing the ends and only retain the data in the middle part. Taking the maximum extreme point and the minimum extreme point of the curvature of the deformation curve as the interception basis, the internal region is intercepted as ; in the formula, and are the extreme points at the top and bottom of the diaphragm wall of the curvature respectively. Within this range, all the in the original data points satisfying are intercepted to obtain the intercepted data set.

[0026] In an exemplary example, the method of the embodiments of the present disclosure further includes: Calculating the moment-curvature ( ) curve of the diaphragm wall based on the fiber beam model; According to the yield curvature of the curve and the curvature of the deformation curve, determining whether there are potential safety hazards in the diaphragm wall.

[0027] In an exemplary example, the embodiments of the present disclosure are based on Based on the yield curvature of the curve and the curvature of the deformation curve, to determine whether there are potential safety hazards in the diaphragm wall, including: When the yield curvature of the curve is less than the curvature of the deformation curve, it is determined that there are potential safety hazards in the diaphragm wall.

[0028] The embodiments of the present disclosure are based on the fiber beam model, and calculate its curve according to the design parameters of the diaphragm wall. Taking the curvature at the yield of the diaphragm wall as the yield curvature, the yield curvature can indicate the maximum bearing capacity of the diaphragm wall, and using it as a reference standard. Once the curvature of the deformation curve is greater than the yield curvature, it means that the load on the diaphragm wall has exceeded its bearing capacity and there are potential safety hazards; the embodiments of the present disclosure realize the judgment of whether there are potential safety hazards in the diaphragm wall through the yield curvature and the curvature of the deformation curve, providing a scientific and effective judgment basis for the safety assessment of deep foundation pit construction.

[0029] In an exemplary example, the embodiments of the present disclosure can calculate its moment-curvature ( ) curve based on the fiber beam model with reference to the related art according to the design parameters such as the cross-sectional size of the diaphragm wall, the types of concrete and steel bars, and the reinforcement ratio, and take the curvature at the yield of the diaphragm wall as the yield curvature.

[0030] The fiber beam model (Fiber Beam Model) in the embodiments of the present disclosure is a commonly used theoretical model in civil engineering and structural mechanics for analyzing the behavior of structural members (such as beams, columns, etc.) under external loads; the fiber beam model divides the cross-section of the structural member into multiple small "fibers" and assumes that the stress borne by each fiber is closely related to the material properties and local strain of the fiber, so as to accurately describe the bending and axial force responses of the structural member under different loads; the fiber beam model is mainly used to analyze the bending, shear and torsion behaviors of structural members such as beams or columns. Especially in nonlinear analysis, it has high accuracy and low computational complexity, and is widely used in structural engineering, civil engineering and the structural analysis of buildings, bridges and tunnels, etc.

[0031] In order to calculate the curve and the yield curvature of the diaphragm wall of the deep foundation pit, the embodiments of the present disclosure can establish a fiber beam model of the diaphragm wall according to the construction drawings, and its modeling and calculation process is as Figure 3 shown. Taking the wall thickness given in the construction drawings as the cross-sectional height , taking the preset length as the cross-sectional width b (since the size of b does not affect the yield curvature, so it is only necessary to refer to the experience and take the preset length, for example, 6m), and modeling the diameter and position of the steel bars according to the reinforcement situation; in the case of bending, assuming that when the cross-section of the beam undergoes small curvature deformation, the strain of each fiber changes linearly; the curvature of the diaphragm wall is the strain gradient between the fibers on the cross-section, which can be expressed as: ; where is the strain at the

[0032] Define the concrete material and the steel bar material. According to the "Code for Design of Concrete Structures" GB / T 50010-2010, the stress-strain relationship curve of the concrete constitutive model is obtained by combining the parabolic rising section and the horizontal section: (2) where is the concrete stress; is the concrete strain (the strain gradient between the fibers on the concrete cross-section); is the design value of the concrete strength; the parameter n is the shape parameter of the rising section curve. The higher the concrete strength, the closer the rising section is to a straight line, and the closer the parameter n is to 1; the peak compressive strain increases with the increase of the concrete strength; is the concrete compressive strain at the edge of the cross-section where the normal cross-section bearing capacity of the concrete member reaches the maximum, which is called the ultimate compressive strain.

[0033] Regard the steel bar as an ideal elastoplastic material, and the stress-strain relationship curve of the steel bar is: (3) where is the steel bar stress; is the steel bar strain (the strain gradient between the fibers on the steel bar cross-section); is the elastic modulus of the steel bar; is the yield strength of the steel bar; is the yield strain of the steel bar, taking .

[0034] The calculation of the bending moment in the embodiments of the present disclosure needs to consider the stress of each fiber and weight them by depth; for each fiber , calculate its stress within the cross-sectional area of the fiber, then multiply it by the distance from the neutral axis, and then perform integral summation to obtain the bending moment: (4) where is the stress of the th fiber. When the fiber is a concrete fiber, is the stress of the th concrete fiber (corresponding to formula (2)); when the fiber is a steel bar fiber, is the stress of the th steel bar fiber (corresponding to formula (3)); is the The distance from the fiber to the neutral axis; is the area of the

[0035] Through the above calculations, embodiments of the present disclosure can obtain a set of bending moment - curvature ( ) data points, and these points form the curve of the diaphragm wall, describing the relationship between the bending moment and the curvature . Figure 4 is a schematic diagram of the relationship between the bending moment and the curvature in embodiments of the present disclosure. As Figure 4 shown, usually when the curvature of the diaphragm wall reaches the yield point, there will also be an inflection point in the bending moment, indicating the yield of concrete or steel bars, thereby obtaining the yield curvature .

[0036] Embodiments of the present disclosure propose a method for safety assessment of deep foundation pits. For subways based on the curvature change of the diaphragm wall, it can monitor and analyze the deformation characteristics of the diaphragm wall in real time, and dynamically evaluate the safety status of the foundation pit in combination with on - site data; taking the curvature change as a key index, it realizes a more sensitive, accurate and safety assessment method with clear mechanical significance, thereby improving the safety of subway deep foundation pit construction.

[0037] Embodiments of the present disclosure realize the intelligence and automation of the safety assessment of deep foundation pits based on the above, greatly reducing the need for manual intervention, improving the efficiency of safety assessment, and reducing human errors.

[0038] Embodiments of the present disclosure also provide a computer storage medium. A computer program is stored in the computer storage medium, and when the computer program is executed by a processor, the above - mentioned method for safety assessment of deep foundation pits is realized.

[0039] Embodiments of the present disclosure also provide a terminal, including: a memory and a processor, and a computer program is stored in the memory; wherein, the processor is configured to execute the computer program in the memory; when the computer program is executed by the processor, the method for safety assessment of deep foundation pits as described above is realized.

[0040] Figure 5 is a structural block diagram of the device for safety assessment of deep foundation pits in embodiments of the present disclosure. As Figure 5 shown, it includes: a conversion unit, an end - processing unit and an analysis unit; wherein, the conversion unit is set to: convert the inclinometer data of the diaphragm wall measured on site to obtain the deformation curve of the diaphragm wall; the end - processing unit is set to: perform end - removal processing on the curvature of the obtained deformation curve in a preset manner; The analysis unit is configured to analyze the deformation characteristics of the diaphragm wall along the depth direction according to the curvature of the deformation curve after end removal.

[0041] In one exemplary instance, the conversion unit of the embodiment of the present disclosure is configured to: convert and obtain the deformation curve of the diaphragm wall according to the inclinometer data measured on site, including: Obtain the deformation curve of the diaphragm wall using the polynomial fitting method or the spline interpolation method according to the inclinometer data.

[0042] In one exemplary instance, the end processing unit of the embodiment of the present disclosure is configured to: Determine the maximum extreme point and the minimum extreme point of the curvature of the deformation curve, retain the internal region between the maximum extreme point and the minimum extreme point, and remove the ends except the internal region; or, Perform a process of intercepting and removing a preset length at both ends of the curvature of the converted deformation curve.

[0043] In one exemplary instance, the analysis unit of the embodiment of the present disclosure is further configured to: Calculate the moment-curvature curve of the diaphragm wall based on the fiber beam model; According to the yield curvature of the curve and the curvature of the deformation curve, determine whether there are potential safety hazards in the diaphragm wall.

[0044] In one exemplary instance, the analysis unit of the embodiment of the present disclosure is configured to: according to the yield curvature of the curve and the curvature of the deformation curve, determine whether there are potential safety hazards in the diaphragm wall, including: When the yield curvature of the curve is less than the curvature of the deformation curve, it is determined that there are potential safety hazards in the diaphragm wall.

[0045] Those of ordinary skill in the art will understand that all or some of the steps in the methods disclosed above, and the functional modules / units in systems and devices, can be implemented as software, firmware, hardware, and appropriate combinations thereof. In the hardware implementation, the division of functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be executed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term "computer storage medium" includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVDs) or other optical disk storage, magnetic cassettes, tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

Claims

1. A method for deep foundation pit safety assessment, characterized in that: include: According to the inclinometric data of the ground-connected wall measured on site, the deformation curve of the ground-connected wall is converted and obtained; For the curvature of the deformation curve obtained by conversion, end removal processing is performed according to a preset method; According to the curvature of the deformation curve with the end removed, the deformation characteristics of the ground-connected wall along the depth direction are analyzed.

2. The method according to claim 1, characterized in that The method of converting the inclinometric data of the ground-connected wall measured on site to obtain the deformation curve of the ground-connected wall comprises: According to the inclinometric data, a polynomial fitting method or a spline interpolation method is used to obtain a deformation curve of the ground-connected wall.

3. The method according to claim 1, characterized in that The deformation curve obtained by conversion is subjected to end removal processing according to a preset method, including: The two ends of the curvature of the deformation curve obtained by conversion are respectively cut off and removed by a preset length.

4. The method according to claim 1, characterized in that: The deformation curve obtained by conversion is subjected to end removal processing according to a preset method, including: The maximum extreme value point and the minimum extreme value point of the curvature of the deformation curve are determined, the internal area between the maximum extreme value point and the minimum extreme value point is intercepted and retained, and the end part except the internal area is removed.

5. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: Calculation of the moment-curvature of ground-connected walls based on the fiber beam model curve; according to The yield curvature of the curve and the curvature of the deformation curve can be used to determine whether there are safety hazards in the ground-connected wall.

6. The method according to claim 5, characterized in that The basis The yield curvature of the curve and the curvature of the deformation curve are used to determine whether the ground-connected wall has safety hazards, including: Said When the yield curvature of the curve is less than the curvature of the deformation curve, it is determined that there is a safety hazard in the ground-connected wall.

7. A computer storage medium, wherein a computer program is stored in the computer storage medium, and when the computer program is executed by a processor, the method for deep foundation pit safety assessment according to any one of claims 1 to 6 is implemented.

8. A terminal, comprising: A memory and a processor, wherein the memory stores a computer program; wherein, The processor is configured to execute the computer program in the memory; When the computer program is executed by the processor, the method for deep foundation pit safety assessment according to any one of claims 1 to 6 is implemented.

9. A device for deep foundation pit safety assessment, comprising: conversion unit, end processing unit and analysis unit; wherein, The conversion unit is configured to: convert and obtain the deformation curve of the ground-connected wall according to the inclinometric data of the ground-connected wall measured on site; The end processing unit is configured to: perform end removal processing on the curvature of the deformation curve obtained by conversion according to a preset method; The analysis unit is configured to analyze the deformation characteristics of the ground-connected wall along the depth direction according to the curvature of the deformation curve removed from the end.

10. The device according to claim 9, characterized in that The analysis unit is further configured to: Calculation of the moment-curvature of ground-connected walls based on the fiber beam model curve; according to The yield curvature of the curve and the curvature of the deformation curve can be used to determine whether there are safety hazards in the ground-connected wall.

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