Method, device and equipment for calculating safety coefficient of shotcrete support and medium

Abstract

The invention relates to the technical field of civil engineering, and discloses a method for calculating a shotcrete support safety coefficient, which comprises the following steps of: calculating an equivalent circle radius of a tunnel section through geological exploration data; a steel frame support and a sprayed concrete support of the tunnel section are obtained, a combined support characteristic curve is constructed, and the combined support characteristic curve comprises a rigidity curve and a maximum bearing capacity curve; obtaining support resistance through the rigidity curve, taking the equivalent circle radius as the tunnel radius, and calculating a surrounding rock characteristic curve in combination with the support resistance; the supporting resistance is distributed to the sprayed concrete through the maximum bearing capacity curve, and the numerical compressive strength is obtained; setting a concrete strain gauge through the surrounding rock characteristic curve to monitor the actually measured compressive strength of the concrete; and calculating the safety coefficient of the shotcrete support according to the actually measured compressive strength and the numerical compressive strength. The invention further provides a device and equipment for calculating the safety coefficient of the shotcrete support and a storage medium. The safety of tunnel construction can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to a method, device, equipment and medium for calculating the safety factor of shotcrete support. Background Art

[0002] As a construction activity with a long history, tunnel engineering has accompanied the development of mankind since ancient times. From the simple excavation and support technology in ancient times to the modern high-tech tunnel construction methods, tunnel engineering has undergone tremendous changes. With the advancement of science and technology and the increase in engineering needs, tunnel construction technology has been continuously innovated, especially in mechanical excavation, geological exploration, support technology and safety management.

[0003] In recent years, the development of tunnel construction technology has brought many challenges, especially in the construction environment of weak surrounding rock. Since the initial strength of shotcrete is low, this may lead to insufficient resistance of the support structure, thereby increasing the risk of tunnel collapse, causing significant economic losses and safety issues. At the same time, in order to improve the strength of shotcrete to enhance the support capacity, higher strength materials are often required, which will lead to a significant increase in construction costs. Therefore, there is an urgent need for a method to determine the safety factor of shotcrete support so that the shotcrete has sufficient support structure resistance in the initial stage and does not cause tunnel collapse. Summary of the invention

[0004] The present invention provides a method, device, equipment and medium for calculating the safety factor of shotcrete support, the main purpose of which is to improve the safety of tunnel construction.

[0005] To achieve the above object, the present invention provides a method for calculating the safety factor of shotcrete support, comprising:

[0006] Acquire geological exploration data of the tunnel excavation, and perform equivalent circle processing on the tunnel section of the excavated tunnel, calculate the radius of the equivalent circle corresponding to the tunnel section through the geological exploration data, and obtain the equivalent circle radius;

[0007] Acquire the steel frame support and shotcrete support of the tunnel section based on the geological exploration data, and construct a combined support characteristic curve according to the shotcrete support and the steel frame support, wherein the combined support characteristic curve includes a stiffness curve of the combined support and a maximum bearing capacity curve of the combined support;

[0008] A numerical simulation model is established through the stiffness curve of the combined support to obtain the support resistance, and the radius of the equivalent circle is used as the tunnel radius of the tunnel section, and the surrounding rock characteristic curve is calculated in combination with the geological exploration data and the support resistance of the tunnel section;

[0009] The support resistance is distributed to the shotcrete of the tunnel excavation through the maximum bearing capacity curve of the combined support to obtain the numerical compressive strength;

[0010] A concrete strain gauge is set in the excavated tunnel to monitor the compressive strength of concrete according to the surrounding rock characteristic curve to obtain the measured compressive strength;

[0011] According to the measured compressive strength and the numerical compressive strength, a preset safety calculation formula is selected to calculate the safety factor of the shotcrete support.

[0012] Optionally, calculating the radius of the equivalent circle corresponding to the tunnel section by using the geological exploration data to obtain the radius of the equivalent circle includes:

[0013] Obtaining the excavation height of the tunnel section and the excavation span of the tunnel section from the geological exploration data;

[0014] The excavation height and the excavation span are used to perform calculations to obtain the equivalent circle radius.

[0015] Optionally, the calculation formula for obtaining the radius of the equivalent circle by using the excavation height and the excavation span is as follows:

[0016] r0=[(B / 2) 2 +F 2 ] / 2F

[0017] Among them, r0 is the radius of the equivalent circle, F is the excavation height of the selected tunnel section, and B is the excavation span of the selected tunnel section.

[0018] Optionally, the establishing of a numerical simulation model through the stiffness curve of the combined support to obtain the support resistance includes:

[0019] Obtaining the support structure of the excavated tunnel through the stiffness curve of the combined support, and obtaining the geometry, material properties and geological conditions, and constructing a numerical simulation model based on the geometry, material properties, geological conditions and support structure of the excavated tunnel;

[0020] By adding boundary conditions to the numerical simulation model and solving the model, the equilibrium state between the supporting structure and the surrounding rock of the excavated tunnel is obtained;

[0021] Collecting the design parameters of the tunnel excavation, geological exploration data and characteristics of the support structure to establish a structural model of the tunnel and the support structure;

[0022] Input all relevant material properties, boundary conditions and initial conditions into the structural model, run the structural model to perform calculations, and obtain the stress, strain and displacement of the support structure under different working conditions;

[0023] The support resistance is calculated based on the stress, strain, displacement and the equilibrium state between the support structure and the surrounding rock.

[0024] Optionally, the step of allocating the support resistance to the shotcrete of the tunnel excavation through the maximum bearing capacity curve of the combined support to obtain the numerical compressive strength comprises:

[0025] Obtaining support parameters used in digging the tunnel;

[0026] Calculating the surrounding rock pressure acting on the tunnel section according to the geological exploration data of the tunnel excavation and the tunnel section size;

[0027] The maximum load that the combined support system can withstand is calculated by combining the maximum bearing capacity curve of the combined support with the support parameters and the surrounding rock pressure;

[0028] When the support resistance is greater than the maximum load, the support resistance is distributed to each shotcrete support element according to the characteristics and arrangement of each shotcrete support element;

[0029] The numerical compressive strength of the shotcrete is obtained by dividing the support resistance assigned to the shotcrete by the area of ​​each shotcrete support element.

[0030] Optionally, constructing a combined support characteristic curve according to the shotcrete support and the steel frame support includes:

[0031] Acquire the support characteristic curve of the shotcrete support and the support characteristic curve of the steel frame support, and obtain the shotcrete support characteristic curve and the steel frame support characteristic curve;

[0032] The combined support characteristic curve is obtained based on the shotcrete support characteristic curve and the steel frame support characteristic curve.

[0033] Optionally, the step of using the equivalent circle radius as the tunnel radius of the tunnel section and calculating the surrounding rock characteristic curve in combination with the geological exploration data and the support resistance of the tunnel section includes:

[0034] Obtaining the surrounding rock elastic modulus, surrounding rock Poisson's ratio, internal friction angle and initial surrounding rock pressure from the geological exploration data;

[0035] The surrounding rock characteristic curve is calculated based on the surrounding rock elastic modulus, surrounding rock Poisson's ratio, internal friction angle, initial surrounding rock pressure, tunnel radius and support resistance, wherein the relationship of the surrounding rock characteristic curve is as follows:

[0036]

[0037] Among them, r0 is the tunnel radius, E is the elastic modulus of the surrounding rock, μ is the Poisson's ratio of the surrounding rock, is the internal friction angle, P0 is the initial surrounding rock pressure, P i To support resistance.

[0038] In order to solve the above problems, the present invention also provides a device for calculating the safety factor of shotcrete support, the device comprising:

[0039] A characteristic curve construction module is used to obtain geological exploration data of tunnel excavation, and perform equivalent circle processing on the tunnel section of the excavated tunnel, calculate the radius of the equivalent circle corresponding to the tunnel section through the geological exploration data, and obtain the equivalent circle radius; based on the geological exploration data, obtain the steel frame support and shotcrete support of the tunnel section, and construct a combined support characteristic curve according to the shotcrete support and the steel frame support, wherein the combined support characteristic curve includes a stiffness curve of the combined support and a maximum bearing capacity curve of the combined support;

[0040] A numerical strength calculation module is used to establish a numerical simulation model through the stiffness curve of the combined support, obtain the support resistance, and use the equivalent circle radius as the tunnel radius of the tunnel section, and calculate the surrounding rock characteristic curve in combination with the geological exploration data and the support resistance of the tunnel section; distribute the support resistance to the shotcrete of the tunnel excavation through the maximum bearing capacity curve of the combined support to obtain the numerical compressive strength;

[0041] A measured strength monitoring module, used to set a concrete strain gauge in the excavated tunnel to monitor the compressive strength of concrete according to the surrounding rock characteristic curve, and obtain the measured compressive strength;

[0042] The safety factor calculation module is used to select a preset safety calculation formula according to the measured compressive strength and the numerical compressive strength to calculate the safety factor of the shotcrete support.

[0043] In order to solve the above problem, the present invention further provides an electronic device, the electronic device comprising:

[0044] at least one processor; and,

[0045] a memory communicatively connected to the at least one processor; wherein,

[0046] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for calculating the safety factor of shotcrete support as described above.

[0047] In order to solve the above problems, the present invention also provides a computer-readable storage medium, including a data storage area and a program storage area, the data storage area stores created data, and the program storage area stores a computer program; wherein, when the computer program is executed by a processor, the method for calculating the safety factor of shotcrete support as described above is implemented.

[0048] The embodiment of the present invention first obtains geological exploration data for tunnel excavation, and performs equivalent circle processing on the tunnel section of the excavated tunnel, calculates the radius of the equivalent circle corresponding to the tunnel section through the geological exploration data, obtains the radius of the equivalent circle, and realizes the purpose of regarding the tunnel section as a circle and obtaining its radius, then obtains the steel frame support and shotcrete support of the tunnel section based on the geological exploration data, and constructs a joint support characteristic curve according to the shotcrete support and the steel frame support, wherein the joint support characteristic curve includes a stiffness curve of the joint support and a maximum bearing capacity curve of the joint support, and then establishes a numerical simulation model through the stiffness curve of the joint support , obtain the support resistance, and use the equivalent circle radius as the tunnel radius of the tunnel section, calculate the surrounding rock characteristic curve in combination with the geological exploration data and the support resistance of the tunnel section, and then distribute the support resistance to the shotcrete of the excavated tunnel through the maximum bearing capacity curve of the combined support, and obtain the numerical compressive strength, so as to obtain the compressive strength of the shotcrete from the numerical level, and finally set a concrete strain gauge in the excavated tunnel through the surrounding rock characteristic curve to monitor the compressive strength of the concrete, and obtain the measured compressive strength. According to the measured compressive strength and the numerical compressive strength, select a preset safety calculation formula to calculate the safety factor of the shotcrete support. Therefore, the calculation method, device, electronic device and computer-readable storage medium of the safety factor of the shotcrete support proposed in the present invention obtain the safety factor of the shotcrete support by isotropically rounding the tunnel section, and by establishing a numerical simulation model to calculate the numerical compressive strength of the tunnel section and monitor the measured compressive strength of the tunnel section, thereby improving the safety of tunnel construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic flow chart of a method for calculating a safety factor of shotcrete support provided by an embodiment of the present invention;

[0050] Figure 2 A schematic diagram of a module of a device for calculating the safety factor of shotcrete support provided by an embodiment of the present invention;

[0051] Figure 3 A schematic diagram of the internal structure of an electronic device for implementing a method for calculating a safety factor of shotcrete support provided by an embodiment of the present invention.

[0052] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0053] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0054] The embodiment of the present application provides a method for calculating the safety factor of shotcrete support. The execution subject of the method for calculating the safety factor of shotcrete support includes but is not limited to at least one of the electronic devices such as a server and a terminal that can be configured to execute the method provided in the embodiment of the present application. Among them, the server can be an independent server, or it can be a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, content delivery networks (Content Delivery Network, CDN), and big data and artificial intelligence platforms. In other words, the method for calculating the safety factor of shotcrete support can be executed by software or hardware installed on a remote device or a server device, and the software can be a blockchain platform. The server includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, etc.

[0055] Reference Figure 1 FIG. 1 is a flow chart of a method for calculating the safety factor of shotcrete support provided by an embodiment of the present invention. In this embodiment, the method for calculating the safety factor of shotcrete support includes the following steps S1-S5:

[0056] S1. Acquire geological exploration data of a tunnel excavation, and perform isotropic circle processing on a tunnel section of the excavated tunnel, calculate the radius of the isotropic circle corresponding to the tunnel section through the geological exploration data, and obtain the radius of the isotropic circle.

[0057] It is understandable that before determining the safety factor of shotcrete support, it is necessary to determine the cross-section of the tunnel being excavated, and in order to facilitate various mathematical calculations, it is necessary to convert the cross-section of the tunnel being excavated into the form of an equivalent circle through geological exploration data.

[0058] In the embodiment of the present invention, the geological exploration data refers to a series of geological parameters and information collected before and during tunnel excavation, which are essential for evaluating the geological conditions of tunnel engineering, designing tunnel structures, and ensuring construction safety. The geological exploration data include, but are not limited to, geological rock formations, geological structures, groundwater conditions, rock mechanical properties, ground stress states, excavation height of tunnel sections, steel frame support and shotcrete support of tunnel sections, etc.

[0059] The stratum lithology refers to the type of stratum through which the tunnel is excavated, such as rock, soil, fracture zone, etc. The rock mechanical properties refer to the rock and soil properties in the excavated tunnel, such as the strength, elastic modulus, Poisson's ratio, friction angle, etc. of the rock.

[0060] Specifically, the tunnel section refers to the cross section of the tunnel, that is, the shape of the tunnel on a plane perpendicular to the tunnel axis. This section shows the width, height and possible other features of the tunnel, such as curvature, irregular shape, etc. The design of the tunnel section depends on many factors, including geological conditions, tunnel use (such as road, railway, canal, etc.), construction methods and safety standards.

[0061] In the embodiment of the present invention, the tunnel cross section is approximately circular during the excavation process.

[0062] In the embodiment of the present invention, the equivalent circle is used to simplify the complexity of the tunnel section so as to perform easy-to-handle engineering analysis and calculation. The equivalent circle is equivalent to the actual section of the tunnel in certain mechanical properties. By using the equivalent circle, the problem can be simplified to the analysis of the circular section, thereby simplifying the calculation process. In addition, the equivalent circle can also be used to approximate the stress distribution of the tunnel section, especially when using certain theoretical models.

[0063] Further, the calculating the radius of the equivalent circle corresponding to the tunnel section through the geological exploration data to obtain the radius of the equivalent circle includes:

[0064] Obtaining the excavation height of the tunnel section and the excavation span of the tunnel section from the geological exploration data;

[0065] The excavation height and the excavation span are used to perform calculations to obtain the equivalent circle radius.

[0066] It is understandable that the excavation height of the tunnel section represents the vertical distance from the bottom to the top of the tunnel section. The excavation span of the tunnel section represents the horizontal distance from the tunnel center to the tunnel edge of the tunnel section, wherein, for a rectangular or other shaped tunnel section, the excavation span may refer to the maximum value of the tunnel width.

[0067] Furthermore, the two parameters of the excavation height and excavation span of the tunnel section jointly determine the area and shape of the tunnel section, affecting the construction method, support requirements, and adaptability to geological conditions of the tunnel.

[0068] In the embodiment of the present invention, the calculation formula for obtaining the radius of the equivalent circle by using the excavation height and the excavation span is as follows:

[0069] r0=[(B / 2) 2 +F 2] / 2F

[0070] Among them, r0 is the radius of the equivalent circle, F is the excavation height of the selected tunnel section, and B is the excavation span of the selected tunnel section.

[0071] S2. Acquire the steel frame support and shotcrete support of the tunnel section based on the geological exploration data, and construct a combined support characteristic curve according to the shotcrete support and the steel frame support, wherein the combined support characteristic curve includes a stiffness curve of the combined support and a maximum bearing capacity curve of the combined support.

[0072] In the embodiment of the present invention, the steel frame support of the tunnel section refers to a structure made of steel (such as steel, steel plate or steel pipe) used to support the surrounding rock of the tunnel. The steel frame support can be a temporary support used to provide support immediately after tunnel excavation to prevent the surrounding rock from collapsing, or it can be a part of the permanent support used in combination with other support forms (such as shotcrete). The shotcrete support can also be called sprayed anchor support, which is a construction technology that uses a concrete sprayer to spray a concrete mixture onto the surface of the tunnel surrounding rock. The shotcrete can quickly form a protective layer that is tightly combined with the surrounding rock, providing immediate support resistance to prevent further deformation and collapse of the surrounding rock.

[0073] Furthermore, the construction of a joint support characteristic curve based on the shotcrete support and the steel frame support includes:

[0074] Acquire the support characteristic curve of the shotcrete support and the support characteristic curve of the steel frame support, and obtain the shotcrete support characteristic curve and the steel frame support characteristic curve;

[0075] The combined support characteristic curve is obtained based on the shotcrete support characteristic curve and the steel frame support characteristic curve.

[0076] In the embodiment of the present invention, the steel frame characteristic curve can be calculated using the equivalent section method, as follows:

[0077]

[0078] Among them, H is the height of the equivalent section of the steel frame, B is the width of the equivalent section of the steel frame, and I steel is the bending moment of inertia of the steel frame, E steel is the actual elastic modulus of the steel frame, I0 is the equivalent bending inertia moment of the steel frame, E0 is the equivalent elastic modulus of the steel frame, μ steel is the actual Poisson's ratio of the steel frame, μ0 is the equivalent Poisson's ratio of the steel frame, σ0 is the equivalent compressive strength of the steel frame, and σ steel is the compressive strength of the steel frame, A steel is the cross-sectional area of ​​the steel frame.

[0079] The maximum bearing capacity and stiffness of the steel frame support are finally obtained as follows:

[0080]

[0081] Among them, r0 is the tunnel radius, σ0 is the equivalent compressive strength of the steel frame, H is the height of the equivalent section of the steel frame, E0 is the equivalent elastic modulus of the steel frame, and μ0 is the Poisson's ratio after the steel frame is equivalent. i is the support force corresponding to the radial displacement.

[0082] Furthermore, the shotcrete support characteristic curve can be calculated by the following formula of the maximum bearing capacity of the shotcrete support and the stiffness of the shotcrete support:

[0083]

[0084] Where t is the thickness of shotcrete, r0 is the radius of the tunnel, P i is the support force corresponding to the radial displacement, μ is the Poisson's ratio of shotcrete, E c It is the elastic mold for shotcrete.

[0085] In the embodiment of the present invention, since the maximum bearing capacity of the shotcrete support and the maximum bearing capacity of the steel frame support represented by the combined support characteristic curve are equivalent, the stiffness of the shotcrete support and the stiffness of the steel frame support represented by the combined support characteristic curve are equivalent, the same identification is used.

[0086] In the embodiment of the present invention, the stiffness of the combined support and the maximum bearing capacity of the combined support can be expressed by the following formula:

[0087]

[0088] Among them, K A is the stiffness of the combined support, P A,max is the maximum bearing capacity of the combined support, K i is the stiffness of a single support, P i,max It is the maximum bearing capacity of a single support.

[0089] S3. A numerical simulation model is established through the stiffness curve of the combined support to obtain the support resistance, and the radius of the equivalent circle is used as the tunnel radius of the tunnel section, and the surrounding rock characteristic curve is calculated in combination with the geological exploration data and the support resistance of the tunnel section.

[0090] It is understandable that the practice of using the equivalent circle radius as the tunnel radius of the tunnel section is mainly based on the purpose of engineering simplification and analysis convenience. In actual situations, the tunnel section may be irregular, while the circular section is relatively simple in mechanical analysis. Using the equivalent circle radius can simplify the geometric shape of the tunnel section and facilitate the application of the theoretical model of the circular section. In addition, in tunnel engineering, many theoretical models and calculation methods are based on the assumption of a circular section. Using the equivalent circle radius as the tunnel radius can unify the analysis method and facilitate the comparison of the characteristics of different tunnel engineering projects.

[0091] Furthermore, whether from the perspective of tunnel construction or from the perspective of maintaining the stability of the tunnel after the tunnel construction is completed, the use of the equivalent circle design can also simplify the calculation of the surrounding rock pressure, thereby facilitating the design of the tunnel support structure.

[0092] In the embodiment of the present invention, the support resistance in tunnel engineering refers to the resistance provided by the support structure (such as shotcrete, anchor rods, steel frames, etc.) to the tunnel surrounding rock. This resistance is used to resist the formation pressure, prevent the deformation and collapse of the surrounding rock, and ensure the stability and safety of the tunnel.

[0093] In the embodiment of the present invention, the method of using the equivalent circle radius as the tunnel radius of the tunnel section and calculating the surrounding rock characteristic curve in combination with the geological exploration data and the support resistance of the tunnel section includes:

[0094] Obtaining the surrounding rock elastic modulus, surrounding rock Poisson's ratio, internal friction angle and initial surrounding rock pressure from the geological exploration data;

[0095] The surrounding rock characteristic curve is calculated based on the surrounding rock elastic modulus, surrounding rock Poisson's ratio, internal friction angle, initial surrounding rock pressure, tunnel radius and the support resistance.

[0096] Furthermore, the surrounding rock characteristic curve can be calculated by the following formula:

[0097]

[0098] Among them, r0 is the tunnel radius, E is the elastic modulus of the surrounding rock, μ is the Poisson's ratio of the surrounding rock, is the internal friction angle, P0 is the initial surrounding rock pressure, P i To support resistance.

[0099] In the embodiment of the present invention, the step of establishing a numerical simulation model through the stiffness curve of the combined support to obtain the support resistance includes:

[0100] Obtaining the support structure of the excavated tunnel through the stiffness curve of the combined support, and obtaining the geometric shape, material properties and geological conditions, and constructing a numerical simulation model according to the geometric shape, material properties, geological conditions and support structure of the excavated tunnel;

[0101] By adding boundary conditions to the numerical simulation model and solving the model, the equilibrium state between the supporting structure and the surrounding rock of the excavated tunnel is obtained;

[0102] Collecting the design parameters of the tunnel excavation, geological exploration data and characteristics of the support structure to establish a structural model of the tunnel and the support structure;

[0103] Input all relevant material properties, boundary conditions and initial conditions into the structural model, run the structural model to perform calculations, and obtain the stress, strain and displacement of the support structure under different working conditions;

[0104] The support resistance is calculated based on the stress, strain, displacement and the equilibrium state between the support structure and the surrounding rock.

[0105] In the embodiment of the present invention, a numerical model of the tunnel and the supporting structure can be established by using professional software (such as ANSYS, ABAQUS, etc.).

[0106] S4. Allocate the support resistance to the shotcrete of the tunnel excavation through the maximum bearing capacity curve of the combined support to obtain the numerical compressive strength.

[0107] In the embodiment of the present invention, the numerical compressive strength refers to the compressive strength value of concrete obtained by numerical simulation or theoretical calculation.

[0108] In the embodiment of the present invention, the maximum bearing capacity curve of the combined support is used to distribute the support resistance to the shotcrete of the tunnel excavation to obtain the numerical compressive strength, including:

[0109] Obtaining support parameters used in digging the tunnel;

[0110] Calculating the surrounding rock pressure acting on the tunnel section according to the geological exploration data of the tunnel excavation and the tunnel section size;

[0111] The maximum load that the combined support system can withstand is calculated by combining the maximum bearing capacity curve of the combined support with the support parameters and the surrounding rock pressure;

[0112] When the support resistance is greater than the maximum load, the support resistance is distributed to each shotcrete support element according to the characteristics and arrangement of each shotcrete support element;

[0113] The numerical compressive strength of the shotcrete is obtained by dividing the support resistance assigned to the shotcrete by the area of ​​each shotcrete support element.

[0114] The support parameters include support type, as well as anchor type, length and arrangement method.

[0115] S5. Setting a concrete strain gauge in the excavated tunnel according to the surrounding rock characteristic curve to monitor the compressive strength of concrete and obtain the measured compressive strength.

[0116] In the embodiment of the present invention, the measured compressive strength refers to the concrete compressive strength data actually obtained at the tunnel site. The measured compressive strength can be obtained by laying concrete strain gauges or other monitoring equipment during the tunnel construction process, reflecting the performance of the concrete in the excavated tunnel under the actual working state.

[0117] In the embodiment of the present invention, the concrete strain gauge is an instrument for measuring the internal strain of the concrete structure, which can help engineers understand the deformation of the concrete during the stress process. In tunnel engineering, the concrete strain gauge is usually embedded in the concrete structure to monitor the stress and strain state of the concrete during construction and use.

[0118] Among them, in tunnel projects, by setting up concrete strain gauges, engineers can understand the stress state of concrete in real time, evaluate whether the compressive strength of concrete meets the design requirements, discover potential structural problems in time, and take corresponding measures to ensure project safety.

[0119] S6. According to the measured compressive strength and the numerical compressive strength, a preset safety calculation formula is selected to calculate the safety factor of the shotcrete support.

[0120] In an embodiment of the present invention, the safety factor of the shotcrete support is used to evaluate the safety and reliability of the shotcrete support structure in tunnel engineering. The safety factor is calculated by comparing the measured strength and numerical compressive strength of the shotcrete support, and reflects the margin of the support structure's ability to withstand actual loads relative to the design load.

[0121] Furthermore, the safety calculation formula of the safety factor of the shotcrete support is as follows:

[0122]

[0123] Among them, F h is the safety factor of shotcrete support; P sc is the measured compressive strength of shotcrete support; P sz It is the numerical compressive strength of shotcrete support.

[0124] In the embodiment of the present invention, by calculating the safety factor of the shotcrete support, it is crucial to evaluate and ensure the safety of the shotcrete support structure in tunnel construction. It allows engineers to verify the consistency between theoretical calculations in the design phase and the actual construction quality, manage potential risks, conduct construction quality control, optimize cost-effectiveness, guide real-time monitoring and construction adjustments, and ensure project load safety regulations and engineering standards. Reasonable determination of the safety factor helps to improve the reliability and economy of tunnel engineering, while providing important data for long-term performance prediction and engineering records.

[0125] The embodiment of the present invention first obtains geological exploration data for tunnel excavation, and performs equivalent circle processing on the tunnel section of the excavated tunnel, calculates the radius of the equivalent circle corresponding to the tunnel section through the geological exploration data, obtains the radius of the equivalent circle, and realizes the purpose of regarding the tunnel section as a circle and obtaining its radius, then obtains the steel frame support and shotcrete support of the tunnel section based on the geological exploration data, and constructs a joint support characteristic curve according to the shotcrete support and the steel frame support, wherein the joint support characteristic curve includes a stiffness curve of the joint support and a maximum bearing capacity curve of the joint support, and then establishes a numerical simulation model through the stiffness curve of the joint support , obtain the support resistance, and use the equivalent circle radius as the tunnel radius of the tunnel section, calculate the surrounding rock characteristic curve in combination with the geological exploration data and the support resistance of the tunnel section, and then distribute the support resistance to the shotcrete of the excavated tunnel through the maximum bearing capacity curve of the combined support, and obtain the numerical compressive strength, so as to obtain the compressive strength of the shotcrete from the numerical level, and finally set a concrete strain gauge in the excavated tunnel through the surrounding rock characteristic curve to monitor the compressive strength of the concrete, and obtain the measured compressive strength. According to the measured compressive strength and the numerical compressive strength, select a preset safety calculation formula to calculate the safety factor of the shotcrete support. Therefore, the calculation method, device, electronic device and computer-readable storage medium of the safety factor of the shotcrete support proposed in the present invention obtain the safety factor of the shotcrete support by isotropically rounding the tunnel section, and by establishing a numerical simulation model to calculate the numerical compressive strength of the tunnel section and monitor the measured compressive strength of the tunnel section, thereby improving the safety of tunnel construction.

[0126] like Figure 2 The figure shows a schematic diagram of a module of a device for calculating the safety factor of shotcrete support according to the present invention.

[0127] The device 100 for calculating the safety factor of shotcrete support of the present invention can be installed in an electronic device. According to the functions to be implemented, the device for calculating the safety factor of shotcrete support can include a characteristic curve construction module 101, a numerical strength calculation module 102, a measured strength monitoring module 103 and a safety factor calculation module 104. The module of the present invention can also be called a unit, which refers to a series of computer program segments that can be executed by an electronic device processor and can complete fixed functions, which are stored in the memory of the electronic device.

[0128] In this embodiment, the functions of each module / unit are as follows:

[0129] The characteristic curve construction module 101 is used to obtain geological exploration data of tunnel excavation, and perform equivalent circle processing on the tunnel section of the excavated tunnel, calculate the radius of the equivalent circle corresponding to the tunnel section through the geological exploration data, and obtain the equivalent circle radius; based on the geological exploration data, obtain the steel frame support and shotcrete support of the tunnel section, and construct a combined support characteristic curve according to the shotcrete support and the steel frame support, wherein the combined support characteristic curve includes a stiffness curve of the combined support and a maximum bearing capacity curve of the combined support;

[0130] The numerical strength calculation module 102 is used to establish a numerical simulation model through the stiffness curve of the combined support, obtain the support resistance, and use the equivalent circle radius as the tunnel radius of the tunnel section, and calculate the surrounding rock characteristic curve in combination with the geological exploration data and the support resistance of the tunnel section; distribute the support resistance to the shotcrete of the tunnel excavation through the maximum bearing capacity curve of the combined support to obtain the numerical compressive strength;

[0131] The measured strength monitoring module 103 is used to set a concrete strain gauge in the excavated tunnel to monitor the compressive strength of concrete according to the surrounding rock characteristic curve to obtain the measured compressive strength;

[0132] The safety factor calculation module 104 is used to select a preset safety calculation formula according to the measured compressive strength and the numerical compressive strength to calculate the safety factor of the shotcrete support.

[0133] In detail, each module described in the device 100 for calculating the safety factor of shotcrete support in the embodiment of the present invention is used in the same manner as described above. Figure 1 The calculation method of the safety factor of shotcrete support is the same technical means and can produce the same technical effect, so it will not be repeated here.

[0134] like Figure 3 The figure is a schematic diagram of the structure of an electronic device for realizing the method for calculating the safety factor of shotcrete support according to the present invention.

[0135] The electronic device may include a processor 10, a memory 11, a communication bus 12, and a communication interface 13, and may also include a computer program stored in the memory 11 and executable on the processor 10, such as a calculation program for the safety factor of shotcrete support.

[0136] In some embodiments, the processor 10 may be composed of an integrated circuit, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and combinations of various control chips. The processor 10 is the control core (ControlUnit) of the electronic device, and uses various interfaces and lines to connect the various components of the entire electronic device, and executes or executes the programs or modules stored in the memory 11 (for example, the calculation program for the safety factor of shotcrete support, etc.), and calls the data stored in the memory 11 to execute various functions of the electronic device and process data.

[0137] The memory 11 includes at least one type of readable storage medium, and the readable storage medium includes a flash memory, a mobile hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a magnetic memory, a disk, an optical disk, etc. In some embodiments, the memory 11 may be an internal storage unit of an electronic device, such as a mobile hard disk of the electronic device. In other embodiments, the memory 11 may also be an external storage device of an electronic device, such as a plug-in mobile hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device. Further, the memory 11 may also include both an internal storage unit of the electronic device and an external storage device. The memory 11 can not only be used to store application software and various types of data installed in the electronic device, such as the code of the calculation program of the safety factor of shotcrete support, but also can be used to temporarily store data that has been output or is to be output.

[0138] The communication bus 12 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The bus is configured to realize connection and communication between the memory 11 and at least one processor 10, etc.

[0139] The communication interface 13 is used for communication between the above-mentioned electronic device and other devices, including a network interface and a user interface. Optionally, the network interface may include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is generally used to establish a communication connection between the electronic device and other electronic devices. The user interface may be a display (Display), an input unit (such as a keyboard (Keyboard)), and optionally, the user interface may also be a standard wired interface, a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, and an OLED (Organic Light-Emitting Diode, organic light-emitting diode) touch device, etc. Among them, the display may also be appropriately referred to as a display screen or a display unit, which is used to display information processed in the electronic device and to display a visual user interface.

[0140] Figure 3 Only an electronic device with components is shown, and those skilled in the art will understand that Figure 3 The structure shown does not constitute a limitation on the electronic device, and may include fewer or more components than shown in the figure, or combine certain components, or arrange the components differently.

[0141] For example, although not shown, the electronic device may also include a power source (such as a battery) for supplying power to each component. Preferably, the power source may be logically connected to the at least one processor 10 through a power management device, so that the power management device can realize functions such as charging management, discharging management, and power consumption management. The power source may also include one or more DC or AC power sources, recharging devices, power failure detection circuits, power converters or inverters, power status indicators, and other arbitrary components. The electronic device may also include a variety of sensors, Bluetooth modules, Wi-Fi modules, etc., which will not be repeated here.

[0142] It should be understood that the embodiment is for illustration only and the scope of the patent application is not limited to this structure.

[0143] The calculation program of the safety factor of shotcrete support stored in the memory 11 of the electronic device is a combination of multiple computer programs. When running in the processor 10, it can achieve:

[0144] Acquire geological exploration data of the tunnel excavation, and perform equivalent circle processing on the tunnel section of the excavated tunnel, calculate the radius of the equivalent circle corresponding to the tunnel section through the geological exploration data, and obtain the equivalent circle radius;

[0145] Acquire the steel frame support and shotcrete support of the tunnel section based on the geological exploration data, and construct a combined support characteristic curve according to the shotcrete support and the steel frame support, wherein the combined support characteristic curve includes a stiffness curve of the combined support and a maximum bearing capacity curve of the combined support;

[0146] A numerical simulation model is established through the stiffness curve of the combined support to obtain the support resistance, and the radius of the equivalent circle is used as the tunnel radius of the tunnel section, and the surrounding rock characteristic curve is calculated in combination with the geological exploration data and the support resistance of the tunnel section;

[0147] The support resistance is distributed to the shotcrete of the tunnel excavation through the maximum bearing capacity curve of the combined support to obtain the numerical compressive strength;

[0148] A concrete strain gauge is set in the excavated tunnel to monitor the compressive strength of concrete according to the surrounding rock characteristic curve to obtain the measured compressive strength;

[0149] According to the measured compressive strength and the numerical compressive strength, a preset safety calculation formula is selected to calculate the safety factor of the shotcrete support.

[0150] Specifically, the specific implementation method of the processor 10 for the above computer program can refer to Figure 1 The description of the relevant steps in the corresponding embodiments will not be repeated here.

[0151] Furthermore, if the module / unit integrated in the electronic device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile computer-readable storage medium. The computer-readable storage medium can be volatile or non-volatile. For example, the computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM).

[0152] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor of an electronic device, the computer program can implement:

[0153] Acquire geological exploration data of the tunnel excavation, and perform equivalent circle processing on the tunnel section of the excavated tunnel, calculate the radius of the equivalent circle corresponding to the tunnel section through the geological exploration data, and obtain the equivalent circle radius;

[0154] Acquire the steel frame support and shotcrete support of the tunnel section based on the geological exploration data, and construct a combined support characteristic curve according to the shotcrete support and the steel frame support, wherein the combined support characteristic curve includes a stiffness curve of the combined support and a maximum bearing capacity curve of the combined support;

[0155] A numerical simulation model is established through the stiffness curve of the combined support to obtain the support resistance, and the radius of the equivalent circle is used as the tunnel radius of the tunnel section, and the surrounding rock characteristic curve is calculated in combination with the geological exploration data and the support resistance of the tunnel section;

[0156] The support resistance is distributed to the shotcrete of the tunnel excavation through the maximum bearing capacity curve of the combined support to obtain the numerical compressive strength;

[0157] A concrete strain gauge is set in the excavated tunnel to monitor the compressive strength of concrete according to the surrounding rock characteristic curve to obtain the measured compressive strength;

[0158] According to the measured compressive strength and the numerical compressive strength, a preset safety calculation formula is selected to calculate the safety factor of the shotcrete support.

[0159] In the several embodiments provided by the present invention, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative, for example, the division of the modules is only a logical function division, and there may be other division methods in actual implementation.

[0160] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0161] In addition, each functional module in each embodiment of the present invention may be integrated into one processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional modules.

[0162] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0163] Therefore, no matter from which point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is limited by the appended claims rather than the above description, so it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any attached figure mark in the claims should not be regarded as limiting the claims involved.

[0164] The blockchain referred to in this invention is a new application mode of computer technologies such as distributed data storage, peer-to-peer transmission, consensus mechanism, encryption algorithm, etc. Blockchain is essentially a decentralized database, a string of data blocks generated by cryptographic methods. Each data block contains a batch of network transaction information, which is used to verify the validity of its information (anti-counterfeiting) and generate the next block. Blockchain can include the underlying blockchain platform, platform product service layer, and application service layer.

[0165] The embodiments of the present application can acquire and process relevant data based on artificial intelligence technology. Among them, artificial intelligence (AI) is the theory, method, technology and application system that uses digital computers or machines controlled by digital computers to simulate, extend and expand human intelligence, perceive the environment, acquire knowledge and use knowledge to obtain the best results.

[0166] In addition, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the system claim can also be implemented by one unit or device through software or hardware. The second and other words are used to indicate names, but not to indicate any particular order.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for calculating the safety factor of shotcrete support, characterized in that: The method comprises: Acquire geological exploration data of the tunnel excavation, and perform equivalent circle processing on the tunnel section of the excavated tunnel, calculate the radius of the equivalent circle corresponding to the tunnel section through the geological exploration data, and obtain the equivalent circle radius; Acquire the steel frame support and shotcrete support of the tunnel section based on the geological exploration data, and construct a combined support characteristic curve according to the shotcrete support and the steel frame support, wherein the combined support characteristic curve includes a stiffness curve of the combined support and a maximum bearing capacity curve of the combined support; A numerical simulation model is established through the stiffness curve of the combined support to obtain the support resistance, and the radius of the equivalent circle is used as the tunnel radius of the tunnel section, and the surrounding rock characteristic curve is calculated in combination with the geological exploration data and the support resistance of the tunnel section; The support resistance is distributed to the shotcrete of the tunnel excavation through the maximum bearing capacity curve of the combined support to obtain the numerical compressive strength; A concrete strain gauge is set in the excavated tunnel to monitor the compressive strength of concrete according to the surrounding rock characteristic curve to obtain the measured compressive strength; According to the measured compressive strength and the numerical compressive strength, a preset safety calculation formula is selected to calculate the safety factor of the shotcrete support.

2. The method for calculating the safety factor of shotcrete support according to claim 1, characterized in that: The step of calculating the radius of the equivalent circle corresponding to the tunnel section through the geological exploration data to obtain the radius of the equivalent circle includes: Obtaining the excavation height of the tunnel section and the excavation span of the tunnel section from the geological exploration data; The excavation height and the excavation span are used to perform calculations to obtain the equivalent circle radius.

3. The method for calculating the safety factor of shotcrete support according to claim 2, characterized in that: The calculation formula for obtaining the radius of the equivalent circle by calculating the excavation height and the excavation span is as follows: r0=[(B / 2) 2 +F 2 ] / 2F Among them, r0 is the radius of the equivalent circle, F is the excavation height of the selected tunnel section, and B is the excavation span of the selected tunnel section.

4. The method for calculating the safety factor of shotcrete support according to claim 1, characterized in that: The method of establishing a numerical simulation model through the stiffness curve of the combined support to obtain the support resistance includes: Obtaining the support structure of the excavated tunnel through the stiffness curve of the combined support, and obtaining the geometry, material properties and geological conditions, and constructing a numerical simulation model based on the geometry, material properties, geological conditions and support structure of the excavated tunnel; By adding boundary conditions to the numerical simulation model and solving the model, the equilibrium state between the supporting structure and the surrounding rock of the excavated tunnel is obtained; Collecting the design parameters of the tunnel excavation, geological exploration data and characteristics of the support structure to establish a structural model of the tunnel and the support structure; Input all relevant material properties, boundary conditions and initial conditions into the structural model, run the structural model to perform calculations, and obtain the stress, strain and displacement of the support structure under different working conditions; The support resistance is calculated based on the stress, strain, displacement and the equilibrium state between the support structure and the surrounding rock.

5. The method for calculating the safety factor of shotcrete support according to claim 1, characterized in that: The method of allocating the support resistance to the shotcrete of the tunnel excavation through the maximum bearing capacity curve of the combined support to obtain the numerical compressive strength includes: Obtaining support parameters used in digging the tunnel; Calculating the surrounding rock pressure acting on the tunnel section according to the geological exploration data of the tunnel excavation and the tunnel section size; The maximum load that the combined support system can withstand is calculated by combining the maximum bearing capacity curve of the combined support with the support parameters and the surrounding rock pressure; When the support resistance is greater than the maximum load, the support resistance is distributed to each shotcrete support element according to the characteristics and arrangement of each shotcrete support element; The numerical compressive strength of the shotcrete is obtained by dividing the support resistance assigned to the shotcrete by the area of ​​each shotcrete support element.

6. The method for calculating the safety factor of shotcrete support according to claim 1, characterized in that: The method of constructing a combined support characteristic curve according to the shotcrete support and the steel frame support includes: Acquire the support characteristic curve of the shotcrete support and the support characteristic curve of the steel frame support, and obtain the shotcrete support characteristic curve and the steel frame support characteristic curve; The combined support characteristic curve is obtained based on the shotcrete support characteristic curve and the steel frame support characteristic curve.

7. The method for calculating the safety factor of shotcrete support according to any one of claims 1 to 6, characterized in that: The method of using the equivalent circle radius as the tunnel radius of the tunnel section and calculating the surrounding rock characteristic curve in combination with the geological exploration data and the support resistance of the tunnel section includes: Obtaining the surrounding rock elastic modulus, surrounding rock Poisson's ratio, internal friction angle and initial surrounding rock pressure from the geological exploration data; The surrounding rock characteristic curve is calculated based on the surrounding rock elastic modulus, surrounding rock Poisson's ratio, internal friction angle, initial surrounding rock pressure, tunnel radius and support resistance, wherein the relationship of the surrounding rock characteristic curve is as follows: Among them, r0 is the tunnel radius, E is the elastic modulus of the surrounding rock, μ is the Poisson's ratio of the surrounding rock, is the internal friction angle, P0 is the initial surrounding rock pressure, P i To support resistance.

8. A device for calculating the safety factor of shotcrete support, characterized in that: The device comprises: A characteristic curve construction module is used to obtain geological exploration data of tunnel excavation, and perform equivalent circle processing on the tunnel section of the excavated tunnel, calculate the radius of the equivalent circle corresponding to the tunnel section through the geological exploration data, and obtain the equivalent circle radius; based on the geological exploration data, obtain the steel frame support and shotcrete support of the tunnel section, and construct a combined support characteristic curve according to the shotcrete support and the steel frame support, wherein the combined support characteristic curve includes a stiffness curve of the combined support and a maximum bearing capacity curve of the combined support; A numerical strength calculation module is used to establish a numerical simulation model through the stiffness curve of the combined support, obtain the support resistance, and use the equivalent circle radius as the tunnel radius of the tunnel section, and calculate the surrounding rock characteristic curve in combination with the geological exploration data and the support resistance of the tunnel section; distribute the support resistance to the shotcrete of the tunnel excavation through the maximum bearing capacity curve of the combined support to obtain the numerical compressive strength; A measured strength monitoring module, used to set a concrete strain gauge in the excavated tunnel to monitor the compressive strength of concrete according to the surrounding rock characteristic curve, and obtain the measured compressive strength; The safety factor calculation module is used to select a preset safety calculation formula according to the measured compressive strength and the numerical compressive strength to calculate the safety factor of the shotcrete support.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for calculating the safety factor of shotcrete support according to any one of claims 1 to 7.

10. A computer-readable storage medium, comprising a data storage area and a program storage area, wherein the data storage area stores created data and the program storage area stores a computer program; wherein: When the computer program is executed by a processor, the method for calculating the safety factor of shotcrete support according to any one of claims 1 to 7 is implemented.

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