Method, device and equipment for formulating management standard of deep foundation pit stability control and medium

Abstract

The present application relates to a kind of deep foundation pit stability control management standard formulation method, device, equipment and medium, its method includes: obtaining rock-soil body parameter, foundation pit excavation layer height, support structure type and parameter;Numerical simulation obtains the support structure and foundation pit safety factor under different support timing;Based on the support structure and foundation pit safety factor under different support timing, support structure and foundation pit safety factor characteristic curve is drawn, and the best support timing is determined;Numerical simulation obtains the limit safety factor of each layer foundation pit rock-soil body and support structure limit axial force;Based on the limit safety factor of each layer foundation pit rock-soil body and support structure limit axial force, surrounding rock characteristic curve and support characteristic curve are drawn, and the limit displacement of each layer foundation pit rock-soil body is determined.The present application uses the limit safety factor of rock-soil body after each layer excavation ends, support structure limit axial force and support structure limit displacement as foundation pit stability evaluation index, guarantee the safety margin of support structure.

Description

Technical Field

[0001] This invention relates to the field of construction safety technology for deep foundation pits, and in particular to a method, apparatus, equipment and medium for formulating standards for stability control and management of deep foundation pits. Background Technology

[0002] Unlike general engineering projects, deep foundation pit projects are characterized by large excavation depths, large volumes, and stringent boundary conditions. They also involve complex surrounding environments and dense populations. If the foundation pit construction design is unreasonable, excessive deformation of the soil and rock during excavation can lead to safety accidents, resulting in serious casualties and economic losses. To prevent such instability risks and ensure foundation pit stability during construction, current standards for deep foundation pit stability control, using displacement as an indicator, are generally based on relevant national specifications. These standards specify safe and warning values ​​for foundation pit displacement for different levels of foundation pits and provide corresponding countermeasures for potential foundation pit safety warning situations. These standards provide a basis for monitoring the safety status of foundation pits and reducing safety risks in foundation pit engineering, offering multiple options for engineering decision-making and possessing strong operability and practical value.

[0003] Current standards for deep foundation pit deformation control management are based on cumulative displacement and displacement rate. However, in actual engineering projects, the characteristics of the soil and rock mass, as well as the excavation and support methods and parameters, differ for each foundation pit. Therefore, existing standards for foundation pit deformation management cannot meet the stability control requirements of all foundation pits. Currently, the evaluation of deep foundation pit stability generally employs theoretical analysis methods. This involves calculating the safety factor of the foundation pit and comparing it with the ultimate safety factor specified in the "Technical Specification for Foundation Pit Support" JGJ120-2012 to evaluate its stability. However, since the stability of a foundation pit is jointly determined by the soil and rock mass and the support structure, the evaluation of foundation pit stability must not only consider the ultimate safety factor but also ensure that the support structure has the maximum safety margin.

[0004] Therefore, given the difficulty that the standard for foundation pit deformation management based on displacement deformation and displacement change rate cannot meet the stability control requirements of all foundation pits, it is urgent to establish a method for formulating a deep foundation pit stability control management standard based on the ultimate safety factor of foundation pit specified in the "Technical Specification for Foundation Pit Support" JGJ120-2012, with the ultimate safety factor of the soil and rock mass of each layer of foundation pit, the ultimate axial force of the support structure, and the ultimate displacement of the soil and rock mass as indicators. Summary of the Invention

[0005] In view of this, it is necessary to provide a method, device, equipment and medium for formulating standards for stability control and management of deep foundation pits, so as to consider the impact of the stability of the support structure on the overall stability of the foundation pit and ensure the safety margin of the support structure.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a method for formulating standards for stability control and management of deep foundation pits, comprising:

[0007] Obtain soil and rock parameters, excavation layer height of foundation pit, and support structure type and parameters;

[0008] Numerical simulations were performed on the soil and rock parameters, the excavation layer height of the foundation pit, the type and parameters of the support structure to obtain the support structure and the safety factor of the foundation pit under different support conditions.

[0009] Based on the support structure and foundation pit safety factor under different support timings, the characteristic curves of the support structure and foundation pit safety factor are plotted, and the optimal support timing is determined based on the characteristic curves of the support structure and foundation pit safety factor.

[0010] Based on the optimal support timing, numerical simulation was performed on the entire dynamic construction process of the foundation pit to obtain the ultimate safety factor of each layer of foundation pit soil and rock and the ultimate axial force of the support structure.

[0011] Based on the ultimate safety factor and ultimate axial force of the support structure for each layer of foundation pit soil and rock, draw the surrounding rock characteristic curve and the support characteristic curve, and determine the ultimate displacement of each layer of foundation pit soil and rock based on the surrounding rock characteristic curve and the support characteristic curve.

[0012] Establish a deep foundation pit stability control and management standard with multiple indicators, including the ultimate safety factor of each layer of excavated soil and rock, the ultimate axial force of each layer of foundation pit support structure, and the ultimate displacement of each layer of foundation pit soil and rock.

[0013] Furthermore, the soil and rock parameters include soil and rock weight, elastic modulus, Poisson's ratio, cohesion, internal friction angle, and tensile strength;

[0014] The excavation layer height includes the excavation height of each layer of the foundation pit during the excavation process;

[0015] The support structure types include internal support, anchor bolt support, and lining. The support parameters of the internal support are material type and cross-sectional dimensions, the support parameters of the anchor bolt support are anchor bolt diameter and spacing, and the support parameters of the lining are lining strength and lining thickness.

[0016] Furthermore, the numerical simulation of the soil and rock parameters, the excavation layer height, the type and parameters of the support structure is used to obtain the support structure and the safety factor of the foundation pit under different support conditions, including:

[0017] Numerical simulations were performed on the soil and rock parameters, excavation layer height, support structure type and parameters to obtain the support structure safety factor and foundation pit safety factor when support was provided until the end of foundation pit excavation for different layered excavation.

[0018] Furthermore, the characteristic curve of the support structure and the safety factor of the foundation pit is a fitting curve of the foundation pit excavation to the end under different support timings.

[0019] The determination of the optimal support timing based on the characteristic curve of the support structure and the foundation pit safety factor includes:

[0020] The ultimate safety factor of the foundation pit is determined based on the preset technical specifications;

[0021] Based on the ultimate safety factor of the foundation pit, the critical support time is determined on the characteristic curve of the support structure and the foundation pit safety factor to ensure that the foundation pit support structure and the soil and rock mass have the maximum safety margin at the same time, and the critical support time is determined as the optimal support time.

[0022] Furthermore, the numerical simulation of the entire dynamic construction process of the foundation pit based on the optimal support timing yields the ultimate safety factor and ultimate axial force of the support structure for each layer of the foundation pit's soil and rock mass, including:

[0023] Numerical simulations were performed on the process of layered excavation of the foundation pit and support at the optimal support time based on the soil and rock parameters, excavation layer height, support structure type and parameters, and the optimal support time. The ultimate safety factor of the soil and rock mass of each layer of the foundation pit and the ultimate axial force of the support structure were obtained.

[0024] Furthermore, the step of plotting the surrounding rock characteristic curve and the support characteristic curve based on the ultimate safety factor and ultimate axial force of the support structure for each layer of foundation pit soil and rock includes:

[0025] In the process of numerical simulation of the entire dynamic construction process of the foundation pit based on the optimal support timing, the stress-strain relationship of the surrounding rock of the foundation pit is obtained, and the surrounding rock characteristic curve and support characteristic curve are plotted based on the stress-strain relationship of the surrounding rock of the foundation pit.

[0026] Furthermore, determining the ultimate displacement of each layer of foundation pit soil and rock mass based on the surrounding rock characteristic curve and the support characteristic curve includes:

[0027] Based on the intersection of the three axes of the ultimate axial force of the support structure under each layer of foundation pit excavation support, the characteristic curve of the surrounding rock and the support characteristic curve, the intercept of the support characteristic curve on the surrounding rock displacement coordinate axis is determined, and the intercept is determined as the ultimate displacement of the soil and rock mass of each layer of foundation pit.

[0028] Secondly, the present invention also provides a device for formulating standards for stability control and management of deep foundation pits, comprising:

[0029] The acquisition module is used to acquire soil and rock parameters, excavation layer height of foundation pit, support structure type and parameters;

[0030] The first numerical simulation module is used to perform numerical simulations on the soil and rock parameters, the layer height of the foundation pit excavation, the type and parameters of the support structure, and to obtain the support structure and the safety factor of the foundation pit under different support conditions.

[0031] The optimal support timing determination module is used to plot the characteristic curves of the support structure and the safety factor of the foundation pit based on the support structure and the foundation pit safety factor under different support timings, and to determine the optimal support timing based on the characteristic curves of the support structure and the foundation pit safety factor.

[0032] The second numerical simulation module is used to perform numerical simulation of the entire dynamic construction process of the foundation pit based on the optimal support timing, and to determine the ultimate safety factor and ultimate axial force of the support structure for each layer of foundation pit soil and rock mass.

[0033] The module for determining the ultimate displacement of the foundation pit rock and soil is used to draw the surrounding rock characteristic curve and the support characteristic curve based on the ultimate safety factor and the ultimate axial force of the support structure for each layer of foundation pit rock and soil, and to determine the ultimate displacement of each layer of foundation pit rock and soil based on the surrounding rock characteristic curve and the support characteristic curve.

[0034] The management standard determination module is used to determine the deep foundation pit stability control management standards based on multiple indicators, including the ultimate safety factor of each layer of excavated soil and rock, the ultimate axial force of each layer of foundation pit support structure, and the ultimate displacement of each layer of foundation pit soil and rock.

[0035] Thirdly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps in the above-mentioned method for formulating standards for stability control and management of deep foundation pits.

[0036] Fourthly, the present invention also provides a computer storage medium, which stores a computer program that, when executed by a processor, implements the steps in the above-described method for formulating standards for deep foundation pit stability control and management.

[0037] The beneficial effects of using the above embodiments are:

[0038] The deep foundation pit stability control and management standard provided by this invention determines the optimal timing for foundation pit support through theoretical calculations, and then determines the ultimate safety factor of the foundation pit and the ultimate axial force of the support structure under each layer of foundation pit excavation. Based on this, the ultimate displacement of the soil and rock mass of each layer of foundation pit is calculated, establishing a deep foundation pit stability control and management standard that is easy to verify theoretically and monitor. The ultimate safety factor of the soil and rock mass, the ultimate axial force of the support structure, and the ultimate displacement of the support structure after each layer of excavation are used as evaluation indicators for foundation pit stability. Compared with the existing management standard that uses displacement as a single indicator, the deep foundation pit stability management system is more comprehensive, specific, and applicable, ensuring the safety margin of the support structure. Attached Figure Description

[0039] Figure 1 A flowchart illustrating an embodiment of a method for formulating standards for stability control and management of deep foundation pits provided by the present invention;

[0040] Figure 2 This is a schematic diagram of the characteristic curve of the support structure and the foundation pit safety factor provided in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram illustrating the determination of the ultimate axial force of the foundation pit support structure in one embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram illustrating the determination of the ultimate displacement of the soil and rock mass in each layer of the foundation pit, as provided in an embodiment of the present invention.

[0043] Figure 5 A schematic diagram of an embodiment of the deep foundation pit stability control and management standard setting device provided by the present invention;

[0044] Figure 6 A schematic diagram of the structure of an embodiment of the electronic device provided by the present invention. Detailed Implementation

[0045] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0046] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, "a plurality of" means two or more, unless otherwise explicitly specified. The reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0047] This invention provides a method, apparatus, equipment, and medium for formulating stability control and management standards for deep foundation pits. Existing foundation pit stability control standards, in practical engineering, fail to meet the stability control requirements of all foundation pits due to differences in soil and rock properties, excavation and support methods, and parameters. Furthermore, current deep foundation pit stability control standards do not consider the impact of support structure stability on the overall stability of the foundation pit, and cannot guarantee the safety margin of the support structure. Therefore, it is urgent to determine the timing of foundation pit support through theoretical calculations, and then determine the ultimate safety factor of the foundation pit and the ultimate axial force of the support structure under each layer of excavation. Based on this, the ultimate displacement of the soil and rock mass in each layer of the foundation pit is calculated, establishing a deep foundation pit stability control and management standard that is easy to verify theoretically and monitor.

[0048] The specific embodiments are described in detail below:

[0049] Please see Figure 1 , Figure 1 This is a flowchart illustrating an embodiment of a method for formulating stability control management standards for deep foundation pits provided by the present invention. A specific embodiment of the present invention discloses a method for formulating stability control management standards for deep foundation pits, comprising:

[0050] Step S101: Obtain soil and rock parameters, excavation layer height of the foundation pit, and type and parameters of the support structure;

[0051] Step S102: Numerical simulation is performed on the parameters of the soil and rock mass, the layer height of the foundation pit excavation, the type and parameters of the support structure to obtain the support structure and the safety factor of the foundation pit under different support conditions.

[0052] Step S103: Based on the support structure and the safety factor of the foundation pit under different support times, draw the characteristic curve of the support structure and the safety factor of the foundation pit, and determine the optimal support time based on the characteristic curve of the support structure and the safety factor of the foundation pit.

[0053] Step S104: Based on the optimal support timing, perform numerical simulation of the entire dynamic construction process of the foundation pit to obtain the ultimate safety factor of the soil and rock mass of each layer of the foundation pit and the ultimate axial force of the support structure.

[0054] Step S105: Based on the ultimate safety factor and ultimate axial force of the support structure for each layer of foundation pit soil and rock, plot the surrounding rock characteristic curve and the support characteristic curve, and determine the ultimate displacement of each layer of foundation pit soil and rock based on the surrounding rock characteristic curve and the support characteristic curve.

[0055] Step S106: Determine the deep foundation pit stability control and management standards based on multiple indicators, including the ultimate safety factor of each layer of excavated soil and rock, the ultimate axial force of each layer of foundation pit support structure, and the ultimate displacement of each layer of foundation pit soil and rock.

[0056] The deep foundation pit stability control and management standard provided by this invention determines the optimal timing for foundation pit support through theoretical calculations, and then determines the ultimate safety factor of the foundation pit and the ultimate axial force of the support structure under each layer of foundation pit excavation. Based on this, the ultimate displacement of the soil and rock mass of each layer of foundation pit is calculated, establishing a deep foundation pit stability control and management standard that is easy to verify theoretically and monitor. The ultimate safety factor of the soil and rock mass, the ultimate axial force of the support structure, and the ultimate displacement of the support structure after each layer of excavation are used as evaluation indicators for foundation pit stability. Compared with the existing management standard that uses displacement as a single indicator, the deep foundation pit stability management system is more comprehensive, specific, and applicable, ensuring the safety margin of the support structure.

[0057] In one embodiment of the present invention, the soil and rock mass parameters include soil and rock mass weight, elastic modulus, Poisson's ratio, cohesion, internal friction angle and tensile strength; wherein, the soil and rock mass parameters can be obtained by strength reduction based on geological exploration and laboratory test results.

[0058] The excavation layer height includes the excavation height of each layer of the foundation pit during the excavation process.

[0059] Support structure types include internal bracing, anchor bolt support, and lining. The support parameters for internal bracing are material type and cross-sectional dimensions, the support parameters for anchor bolt support are anchor bolt diameter and spacing, and the support parameters for lining are lining strength and lining thickness.

[0060] In one embodiment of the present invention, numerical simulations are performed on soil and rock parameters, excavation layer height of the foundation pit, support structure type and parameters to obtain the support structure and foundation pit safety factor under different support conditions, including:

[0061] Numerical simulations were performed on soil and rock parameters, excavation layer height, support structure type and parameters to obtain the support structure safety factor and foundation pit safety factor when support is provided until the end of foundation pit excavation for different layered excavation.

[0062] Therefore, the characteristic curve of the support structure and the safety factor of the foundation pit is a fitting curve of the foundation pit excavation to the end under different support timing.

[0063] Determining the optimal support timing based on the characteristic curves of the support structure and the foundation pit safety factor includes:

[0064] The ultimate safety factor of the foundation pit is determined based on the preset technical specifications;

[0065] Based on the ultimate safety factor of the foundation pit, the critical support time is determined on the characteristic curve of the support structure and the foundation pit safety factor to ensure that the foundation pit support structure and the soil and rock mass have the maximum safety margin at the same time, and the critical support time is determined as the optimal support time.

[0066] For details, please refer to Figure 2 , Figure 2 This is a schematic diagram of the characteristic curves of the support structure and the foundation pit safety factor provided in one embodiment of the present invention. It can be understood that the ultimate safety factor of the foundation pit can be determined through a preset technical specification, namely the "Technical Specification for Foundation Pit Support" JGJ120-2012. The critical support timing that ensures both the foundation pit support structure and the soil mass have the maximum safety margin can be determined on the characteristic curves of the support structure safety factor and the foundation pit safety factor; this support timing is the optimal support timing.

[0067] It is understandable that the present invention formulates a deep foundation pit stability control and management standard, based on the foundation pit limit safety factor specified in the pre-set technical specifications, and breaks through the problem that the traditional foundation pit deformation control and management standard is difficult to meet the problem that the total displacement deformation and displacement change rate are not universally applicable due to the different characteristics of rock and soil in different deep foundation pits and the differences in excavation and support.

[0068] In one embodiment of the present invention, numerical simulation is performed on the entire dynamic construction process of the foundation pit based on the optimal support timing to obtain the ultimate safety factor of the soil and rock mass of each layer of the foundation pit and the ultimate axial force of the support structure, including:

[0069] Numerical simulations were performed on the process of layered excavation of the foundation pit and support at the optimal support time based on soil and rock parameters, excavation layer height, support structure type and parameters, and optimal support timing. The ultimate safety factor of the soil and rock mass of each layer of the foundation pit and the ultimate axial force of the support structure were obtained.

[0070] For details, please refer to Figure 3 , Figure 3 This is a schematic diagram illustrating the determination of the ultimate axial force of the support structure for each layer of the foundation pit, provided as an embodiment of the present invention. By simulating the process of layered excavation of the foundation pit and the support being carried out at the optimal time, the ultimate safety factor of the soil and rock mass and the ultimate axial force of the support structure for each layer of the foundation pit can be determined.

[0071] In one embodiment of the present invention, the surrounding rock characteristic curve and the support characteristic curve are plotted based on the ultimate safety factor and the ultimate axial force of the support structure for each layer of foundation pit soil and rock, including:

[0072] In the process of numerical simulation of the entire dynamic construction process of the foundation pit based on the optimal support timing, the stress-strain relationship of the surrounding rock of the foundation pit is obtained, and the surrounding rock characteristic curve and support characteristic curve are plotted based on the stress-strain relationship of the surrounding rock of the foundation pit.

[0073] The ultimate displacement of the soil and rock mass in each layer of the foundation pit is determined based on the surrounding rock characteristic curve and the support characteristic curve, including:

[0074] Based on the intersection of the three axes of the ultimate axial force of the support structure under each layer of foundation pit excavation support, the characteristic curve of the surrounding rock and the support characteristic curve, the intercept of the support characteristic curve on the surrounding rock displacement coordinate axis is determined, and the intercept is determined as the ultimate displacement of the soil and rock mass of each layer of foundation pit.

[0075] Understandably, please refer to Figure 4 , Figure 4 This is a schematic diagram illustrating the determination of the ultimate displacement of the soil and rock mass in each layer of the foundation pit according to an embodiment of the present invention. The support characteristic curve is divided into two segments: the first segment is linear, with the slope representing the stiffness of the support structure; the second segment represents the maximum axial force that the support structure can withstand. The intercept of the support characteristic curve on the surrounding rock displacement coordinate axis is determined by the intersection points of the ultimate axial force of the support structure under each layer of foundation pit excavation support, the surrounding rock characteristic curve, and the support characteristic curve, thereby determining the ultimate displacement of the soil and rock mass under each layer of foundation pit excavation support.

[0076] To better implement the method for formulating deep foundation pit stability control management standards in this embodiment of the invention, based on the method for formulating deep foundation pit stability control management standards, please refer to the corresponding documentation. Figure 5 , Figure 5 This is a schematic diagram of an embodiment of the deep foundation pit stability control management standard setting device provided by the present invention. The embodiment of the present invention provides a deep foundation pit stability control management standard setting device 500, comprising:

[0077] Module 501 is used to acquire soil and rock parameters, excavation layer height of foundation pit, support structure type and parameters;

[0078] The first numerical simulation module 502 is used to perform numerical simulations on soil and rock parameters, excavation layer height of foundation pit, support structure type and parameters, and obtain the support structure and foundation pit safety factor under different support times.

[0079] The optimal support timing determination module 503 is used to plot the characteristic curves of the support structure and the safety factor of the foundation pit based on the support structure and the foundation pit safety factor under different support timings, and to determine the optimal support timing based on the characteristic curves of the support structure and the foundation pit safety factor.

[0080] The second numerical simulation module 504 is used to perform numerical simulation of the entire dynamic construction process of the foundation pit based on the optimal support timing, and to determine the ultimate safety factor and ultimate axial force of the support structure for each layer of foundation pit soil and rock mass.

[0081] The module 505 for determining the ultimate displacement of the foundation pit rock and soil is used to draw the surrounding rock characteristic curve and the support characteristic curve based on the ultimate safety factor and the ultimate axial force of the support structure for each layer of foundation pit rock and soil, and to determine the ultimate displacement of each layer of foundation pit rock and soil based on the surrounding rock characteristic curve and the support characteristic curve.

[0082] The management standard determination module 506 is used to determine the deep foundation pit stability control management standard with multiple indicators, including the ultimate safety factor of each layer of excavated rock and soil, the ultimate axial force of each layer of foundation pit support structure, and the ultimate displacement of each layer of foundation pit rock and soil.

[0083] It should be noted that the device 500 provided in the above embodiments can implement the technical solutions described in the above method embodiments. The specific implementation principles of the above modules or units can be found in the corresponding content in the above method embodiments, and will not be repeated here.

[0084] Based on the above-described method for formulating standards for deep foundation pit stability control and management, this invention also provides an electronic device, including: a processor and a memory, and a computer program stored in the memory and executable on the processor; when the processor executes the computer program, it implements the steps in the method for formulating standards for deep foundation pit stability control and management as described in the above embodiments.

[0085] Figure 6 The diagram shows a structural schematic of an electronic device 600 suitable for implementing embodiments of the present invention. The electronic device in the embodiments of the present invention may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 6 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments of the present invention.

[0086] The electronic device includes a memory and a processor, wherein the processor may be referred to as processing device 601 below, and the memory may include at least one of read-only memory (ROM) 602, random access memory (RAM) 603 and storage device 608 below, as detailed below:

[0087] like Figure 6 As shown, electronic device 600 may include a processing device (e.g., a central processing unit, a graphics processor, etc.) 601, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 602 or a program loaded from storage device 608 into random access memory (RAM) 603. RAM 603 also stores various programs and data required for the operation of electronic device 600. Processing device 601, ROM 602, and RAM 603 are interconnected via bus 604. Input / output (I / O) interface 605 is also connected to bus 604.

[0088] Typically, the following devices can be connected to I / O interface 605: input devices 606 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 607 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 608 including, for example, magnetic tapes, hard disks, etc.; and communication devices 609. Communication device 609 allows electronic device 600 to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 6 An electronic device 600 with various devices is shown; however, it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed alternatively.

[0089] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 609, or installed from a storage device 608, or installed from a ROM 602. When the computer program is executed by the processing device 601, it performs the functions defined in the methods of the embodiments of the present invention.

[0090] Based on the above-described method for formulating standards for deep foundation pit stability control and management, this embodiment of the invention also provides a computer-readable storage medium storing one or more programs that can be executed by one or more processors to implement the steps in the method for formulating standards for deep foundation pit stability control and management as described in the above embodiments.

[0091] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0092] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for formulating standards for stability control and management of deep foundation pits, characterized in that, include: Obtain soil and rock parameters, excavation layer height of foundation pit, and support structure type and parameters; Numerical simulations were performed on the soil and rock parameters, excavation layer height, support structure type and parameters to obtain the support structure and foundation pit safety factor under different support timings. This included: numerical simulations were performed on the soil and rock parameters, excavation layer height, support structure type and parameters to obtain the support structure safety factor and foundation pit safety factor when support was provided until the end of foundation pit excavation for different layered excavation. Based on the support structure and foundation pit safety factor under different support timings, the characteristic curves of the support structure and foundation pit safety factor are plotted, and the optimal support timing is determined based on the characteristic curves of the support structure and foundation pit safety factor. Based on the optimal support timing, numerical simulation was performed on the entire dynamic construction process of the foundation pit to obtain the ultimate safety factor of each layer of foundation pit soil and rock and the ultimate axial force of the support structure. Based on the ultimate safety factor and ultimate axial force of the support structure for each layer of foundation pit soil and rock, draw the surrounding rock characteristic curve and the support characteristic curve, and determine the ultimate displacement of each layer of foundation pit soil and rock based on the surrounding rock characteristic curve and the support characteristic curve. Establish a deep foundation pit stability control and management standard with multiple indicators, including the ultimate safety factor of each layer of excavated soil and rock, the ultimate axial force of each layer of foundation pit support structure, and the ultimate displacement of each layer of foundation pit soil and rock. The characteristic curves of the support structure and the safety factor of the foundation pit are fitting curves of the foundation pit excavation to the end under different support timings. The determination of the optimal support timing based on the characteristic curve of the support structure and the foundation pit safety factor includes: The ultimate safety factor of the foundation pit is determined based on the preset technical specifications; Based on the ultimate safety factor of the foundation pit, the critical support time is determined on the characteristic curve of the support structure and the foundation pit safety factor to ensure that the foundation pit support structure and the soil and rock mass have the maximum safety margin at the same time, and the critical support time is determined as the optimal support time.

2. The method for formulating standards for deep foundation pit stability control and management according to claim 1, characterized in that, The parameters of the soil and rock mass include the weight, elastic modulus, Poisson's ratio, cohesion, internal friction angle, and tensile strength of the soil and rock mass. The excavation layer height includes the excavation height of each layer of the foundation pit during the excavation process; The support structure types include internal support, anchor bolt support, and lining. The support parameters of the internal support are material type and cross-sectional dimensions, the support parameters of the anchor bolt support are anchor bolt diameter and spacing, and the support parameters of the lining are lining strength and lining thickness.

3. The method for formulating standards for deep foundation pit stability control and management according to claim 1, characterized in that, The numerical simulation of the entire dynamic construction process of the foundation pit based on the optimal support timing yields the ultimate safety factor and ultimate axial force of the support structure for each layer of the foundation pit's soil and rock mass, including: Numerical simulations were performed on the process of layered excavation of the foundation pit and support at the optimal support time based on the soil and rock parameters, excavation layer height, support structure type and parameters, and the optimal support time. The ultimate safety factor of the soil and rock mass of each layer of the foundation pit and the ultimate axial force of the support structure were obtained.

4. The method for formulating standards for deep foundation pit stability control management according to claim 1, characterized in that, The process of plotting surrounding rock characteristic curves and support characteristic curves based on the ultimate safety factor and ultimate axial force of the support structure for each layer of foundation pit soil and rock includes: In the process of numerical simulation of the entire dynamic construction process of the foundation pit based on the optimal support timing, the stress-strain relationship of the surrounding rock of the foundation pit is obtained, and the surrounding rock characteristic curve and support characteristic curve are plotted based on the stress-strain relationship of the surrounding rock of the foundation pit.

5. The method for formulating standards for deep foundation pit stability control and management according to claim 4, characterized in that, The determination of the ultimate displacement of the soil and rock mass of each layer of the foundation pit based on the surrounding rock characteristic curve and the support characteristic curve includes: Based on the intersection of the three axes of the ultimate axial force of the support structure under each layer of foundation pit excavation support, the characteristic curve of the surrounding rock and the support characteristic curve, the intercept of the support characteristic curve on the surrounding rock displacement coordinate axis is determined, and the intercept is determined as the ultimate displacement of the soil and rock mass of each layer of foundation pit.

6. A device for formulating standards for stability control and management of deep foundation pits, characterized in that, include: The acquisition module is used to acquire soil and rock parameters, excavation layer height of foundation pit, support structure type and parameters; The first numerical simulation module is used to perform numerical simulations on the soil and rock parameters, the excavation layer height, the support structure type and parameters, and to obtain the support structure and the safety factor of the foundation pit under different support timings. This includes: performing numerical simulations on the soil and rock parameters, the excavation layer height, the support structure type and parameters, and to obtain the support structure safety factor and the foundation pit safety factor when support is provided until the end of the foundation pit excavation for different layered excavation. The optimal support timing determination module is used to plot the characteristic curves of the support structure and the safety factor of the foundation pit based on the support structure and the foundation pit safety factor under different support timings, and to determine the optimal support timing based on the characteristic curves of the support structure and the foundation pit safety factor. The second numerical simulation module is used to perform numerical simulation of the entire dynamic construction process of the foundation pit based on the optimal support timing, and to determine the ultimate safety factor and ultimate axial force of the support structure for each layer of foundation pit soil and rock mass. The module for determining the ultimate displacement of the foundation pit rock and soil is used to draw the surrounding rock characteristic curve and the support characteristic curve based on the ultimate safety factor and the ultimate axial force of the support structure for each layer of foundation pit rock and soil, and to determine the ultimate displacement of each layer of foundation pit rock and soil based on the surrounding rock characteristic curve and the support characteristic curve. The management standard determination module is used to determine the deep foundation pit stability control management standard with multiple indicators, including the ultimate safety factor of each layer of excavated soil and rock, the ultimate axial force of each layer of foundation pit support structure, and the ultimate displacement of each layer of foundation pit soil and rock. The characteristic curves of the support structure and the safety factor of the foundation pit are fitting curves of the foundation pit excavation to the end under different support timings. The determination of the optimal support timing based on the characteristic curve of the support structure and the foundation pit safety factor includes: The ultimate safety factor of the foundation pit is determined based on the preset technical specifications; Based on the ultimate safety factor of the foundation pit, the critical support time is determined on the characteristic curve of the support structure and the foundation pit safety factor to ensure that the foundation pit support structure and the soil and rock mass have the maximum safety margin at the same time, and the critical support time is determined as the optimal support time.

7. An electronic device, characterized in that, The method includes a memory and a processor, wherein the memory is used to store a program; and the processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps in the method for formulating standards for stability control and management of deep foundation pits as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, Used to store computer-readable programs or instructions, which, when executed by a processor, are capable of implementing the steps in the deep foundation pit stability control and management standard formulation method according to any one of claims 1 to 5.

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