A method, apparatus, device and storage medium for determining shear strength

Abstract

Embodiments of the present application disclose a shear strength determination method, device, equipment and storage medium, wherein the shear strength determination method comprises: creating a shear strength correction model; correction factors of the shear strength correction model comprise shear strength, normal stress and shear width; based on the shear strength correction model, a correction mapping relationship between the shear strength and the normal stress when the shear width is zero is determined; based on the correction mapping relationship, a shear strength value of a rock to be measured is determined.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering surveying, and in particular to a shear strength determination method, device, equipment and storage medium. BACKGROUND

[0002] Shear strength is an important parameter for evaluating slope and filling engineering, which is widely used in the stability and safety design and evaluation of highway and railway embankment, airport and building filling site, water conservancy earth-rock dam and other engineering.

[0003] At present, shear test is often used to determine the shear strength of rock and soil. In the shear test, a certain width of shear gap is left between the upper and lower shear boxes to complete the shear. There is no uniform standard for the width of the shear gap in the current test procedures, which leads to the deviation between the measured rock shear strength and the actual shear strength, and the obtained cohesion and internal friction angle are also not accurate, which often causes unreasonable engineering design, and even causes engineering accidents in serious cases. SUMMARY

[0004] The embodiments of the present application expect to provide a shear strength determination method, device, equipment and storage medium.

[0005] The technical solution of the present application is realized as follows:

[0006] The embodiments of the first aspect of the present application provide a shear strength determination method, comprising:

[0007] creating a shear strength correction model; the correction factors of the shear strength correction model include shear strength, normal stress and shear width;

[0008] determining the correction mapping relationship between the shear strength and the normal stress when the shear width is zero based on the shear strength correction model;

[0009] determining the shear strength value of the rock to be measured based on the correction mapping relationship.

[0010] Optionally, the shear strength correction model is:

[0011] τ=σ n e (A-Bx) +C;

[0012] wherein τ represents shear strength, σ n represents normal stress, x represents shear width, A, B and C are fitting coefficients of different types, and are constants.

[0013] Optionally, the determination of the correction mapping relationship between the shear strength and the normal stress when the shear width is zero based on the shear strength correction model comprises:

[0014] determining an initial mapping relationship among the shear strength, the normal stress and the shear width based on importing at least three groups of test data into the shear strength correction model;

[0015] determining a correction mapping relationship between the shear strength and the normal stress when the shear width is zero based on the initial mapping relationship.

[0016] Optionally, the determining the shear strength value of the rock to be measured based on the correction mapping relationship further includes:

[0017] determining at least two groups of shear strength values and normal stress values corresponding to the shear strength values based on the correction mapping relationship;

[0018] importing the shear strength values and the normal stress values into a preset shear model to determine mechanical parameters of the rock to be measured; the mechanical parameters include cohesion and internal friction angle of the rock to be measured.

[0019] Optionally, the preset shear model is:

[0020]

[0021] wherein, τ represents the shear strength, σ n represents the normal stress, represents the internal friction angle, and c represents the cohesion of the rock to be measured.

[0022] Embodiments of the second aspect of the present application provide a shear strength determination device, including:

[0023] a creating module configured to create a shear strength correction model; correction factors of the shear strength correction model include shear strength, normal stress and shear width;

[0024] a first determining module configured to determine a correction mapping relationship between the shear strength and the normal stress when the shear width is zero based on the shear strength correction model;

[0025] a second determining module configured to determine a shear strength value of a rock to be measured based on the correction mapping relationship.

[0026] Optionally, the first determining module is specifically configured to:

[0027] determining an initial mapping relationship among the shear strength, the normal stress and the shear width based on importing at least three groups of test data into the shear strength correction model;

[0028] determining a correction mapping relationship between the shear strength and the normal stress when the shear width is zero based on the initial mapping relationship.

[0029] Optionally, the second determining module is specifically used for:

[0030] determining at least two groups of shear strength values and normal stress values corresponding to the shear strength values based on the correction mapping relationship;

[0031] introducing the shear strength values and the normal stress values into a preset shear model to determine the shear strength value of the rock to be measured.

[0032] Embodiments of the third aspect of the present application provide an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the steps of the method of the first aspect.

[0033] Embodiments of the fourth aspect of the present application provide a computer readable storage medium, which stores a computer program, and the processor executes the computer program to perform the steps of the method of the first aspect.

[0034] The shear strength determination method, device, equipment and storage medium provided by the embodiments of the present application, wherein the shear strength determination method comprises: creating a shear strength correction model; the correction factors of the shear strength correction model comprise shear strength, normal stress and shear width; determining a correction mapping relationship between the shear strength and the normal stress when the shear width is zero based on test data and the shear strength correction model; and determining a shear strength value of a rock to be measured based on the correction mapping relationship. By creating a shear strength correction model and establishing a mapping relationship between shear strength and normal stress and shear width, the influence of shear width on the determination result can be eliminated, and the determination accuracy of shear strength can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 A flowchart of a shear strength determination method provided by the embodiments of the present application is shown;

[0036] Figure 2 A scene diagram of a shear test provided by the embodiments of the present application is shown;

[0037] Figure 3 A structural diagram of a shear strength determination device provided by the embodiments of the present application is shown;

[0038] Figure 4 A structural diagram of an electronic device provided by the embodiments of the present application is shown. DETAILED DESCRIPTION

[0039] With reference to the drawings and the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0040] In addition, the drawings are only schematic illustrations of the present application, and are not necessarily drawn to scale. Identical reference numerals in the drawings represent identical or similar parts, and thus repeated descriptions thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities, and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0041] The flowcharts shown in the drawings are only exemplary illustrations, and do not necessarily include all the steps. For example, some steps can be further decomposed, and some steps can be combined or partially combined, so that the actual execution order can be changed according to the actual situation.

[0042] The terms used herein are only for the purpose of describing specific embodiments and do not serve as limitations of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the terms "comprise" and / or "include" when used in this specification, determine the presence of stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of the associated listed items.

[0043] First, the terms involved in the embodiments of the present application are briefly introduced.

[0044] Shear strength, also known as shear strength, represents the ultimate strength of a material when it is sheared, which reflects the ability of the material to resist shear sliding. In numerical value, it is equal to the tangential stress value on the shear plane, i.e. the ratio of shear force formed on the shear plane to the failure area.

[0045] Normal stress is the internal force generated between parts of an object to resist the action of external factors such as force and humidity change, and to try to restore the object from the deformed position to the deformed position.

[0046] Internal friction angle, reflecting the friction characteristics of rock and soil, generally includes two parts: the surface friction of soil particles, and the bite force generated by the embedding and interlocking action between particles.

[0047] Cohesion, also known as cohesive force, is the mutual attraction between adjacent parts inside the same substance.

[0048] In some embodiments, referring to Figure 1 , Figure 1 A flowchart of a shear strength determination method provided by an embodiment of the present application; the shear strength determination method comprises:

[0049] S110, creating a shear strength correction model; the correction factors of the shear strength correction model include shear strength, normal stress, and shear width.

[0050] The present embodiment is applied to determine the shear strength of rock. The shear strength of rock is related to the properties of the rock itself, and the actual measured results are also affected by the determination method.

[0051] In an optional embodiment, the shear strength correction model is:

[0052] τ = σ n e (A-Bx) + C;

[0053] Wherein, τ represents shear strength, σ n represents normal stress, x represents shear width, A, B, and C are different types of fitting coefficients, and are constants.

[0054] In the present embodiment, the shear strength is the theoretical shear strength. The shear strength is related to the normal stress and the shear width. Among them, the fitting coefficient A reflects the sensitivity of the shear strength of the rock to the shear width of the sample; the fitting coefficient B represents the correlation between the shear strength of the rock and the shear width of the sample, B > 0 is negatively correlated, B < 0 is positively correlated, and B = 0 has no correlation; the fitting coefficient C represents the gradual linear strength of the shear strength with the increase of the shear width under the same normal stress.

[0055] In an optional embodiment, referring to Figure 2 , Figure 2 A scene diagram of a shear test provided by an embodiment of the present application. Wherein, τ represents shear strength, σ n represents normal stress. The sample is fixed by the shear clamp 210, and sheared along the shear joint 220.

[0056] According to the definition of shear strength, the smaller the width of the shear joint 220, the closer the measured shear strength value is to the actual shear strength. In theory, when the width of the shear joint 220 is zero, the measured shear strength value is the actual shear strength.

[0057] S120, determining a correction mapping relationship between the shear strength and the normal stress when the shear width is zero based on the shear strength correction model.

[0058] In this embodiment, the shear width x in the shear strength correction model is set to 0, and the correction mapping relationship between the shear strength and the normal stress is determined. Since A, B and C are constants, the shear strength and the normal stress are in one-to-one correspondence.

[0059] S130, determining the shear strength value of the rock to be measured based on the correction mapping relationship.

[0060] In one example, a shear test is performed on a sample, and the test results are shown in Table 1.

[0061]

[0062] Table 1

[0063] When the shear width x is set to 0, the corresponding shear strength τ is measured when the normal stress is 10 MPa, 15 MPa and 20 MPa, respectively.

[0064] The embodiments of the present application create a shear strength correction model to establish a mapping relationship between the shear strength and the normal stress and the shear width, so as to eliminate the influence of the shear width on the test results and improve the measurement accuracy of the shear strength.

[0065] In some embodiments, the correction mapping relationship between the shear strength and the normal stress when the shear width is zero is determined based on the shear strength correction model, including:

[0066] At least three sets of test data are imported into the shear strength correction model to determine an initial mapping relationship between the shear strength, the normal stress and the shear width;

[0067] Based on the initial mapping relationship, a correction mapping relationship between the shear strength and the normal stress when the shear width is zero is determined.

[0068] In this embodiment, the shear strength correction model is:

[0069] τ = σ n e (A-Bx) +C;

[0070] By measuring at least three sets of shear strength values, normal stress values and shear width values and importing them into the shear strength correction model, the specific values of the fitting coefficients A, B and C can be determined.

[0071] In one example, the measured three groups of shear strength values, normal stress values and shear width values are introduced into the shear strength correction model, and based on the obtained fitting coefficients A, B and C, the initial mapping relationship between the shear strength, the normal stress and the shear width is determined.

[0072] In another example, the measured three groups of shear strength values, normal stress values and shear width values are introduced into the shear strength correction model, and based on the principle of nonlinear least squares, the fitting coefficients A, B and C are obtained, and based on this, the initial mapping relationship between the shear strength, the normal stress and the shear width is determined.

[0073] In some embodiments, based on the corrected mapping relationship, the shear strength value of the rock to be measured is determined, and the method further comprises:

[0074] Based on the corrected mapping relationship, at least two groups of shear strength values and the corresponding normal stress values of the shear strength values are determined.

[0075] The shear strength values and the normal stress values are introduced into a preset shear model to determine the mechanical parameters of the rock to be measured; the mechanical parameters include the cohesion and the internal friction angle of the rock to be measured.

[0076] In an optional embodiment, the preset shear model is:

[0077]

[0078] wherein τ represents the shear strength, σ n represents the normal stress, represents the internal friction angle, and c represents the cohesion of the rock to be measured.

[0079] As described in Table 1 above, at least two groups of shear strength values and the corresponding normal stress values of the shear strength values are introduced into a preset shear model, so that the cohesion and the internal friction angle of the rock to be measured can be determined to reflect the mechanical properties of the rock to be measured.

[0080] In some embodiments, please refer to Figure 3 , Figure 3 A structural schematic diagram of a shear strength determination device provided by the embodiments of the present application, the shear strength determination 300 comprises a first acquisition module 310, a second acquisition module 320, a decoding module 330 and a reconstruction module 340, wherein:

[0081] The creation module 310 is configured to create a shear strength correction model; the correction factors of the shear strength correction model include the shear strength, the normal stress and the shear width;

[0082] The first determination module 320 is configured to determine the corrected mapping relationship between the shear strength and the normal stress when the shear width is zero based on the shear strength correction model;

[0083] The second determining module 330 is configured to determine the shear strength value of the rock to be measured based on the corrected mapping relationship.

[0084] The embodiment is applied to measuring the shear strength of a rock. The shear strength of the rock is related to the properties of the rock itself, and the actually measured result is also affected by the measuring method.

[0085] In an optional embodiment, the shear strength correction model is:

[0086] τ = σ n e (A-Bx) + C.

[0087] wherein τ represents the shear strength, σ n represents the normal stress, x represents the shear width, A, B and C are fitting coefficients of different types, and the constants.

[0088] In the embodiment, the shear strength is the theoretical shear strength. The shear strength is related to the normal stress and the shear width. The fitting coefficient A reflects the sensitivity of the shear strength of the rock to the shear width of the sample; the fitting coefficient B represents the correlation between the shear strength of the rock and the shear width of the sample, and when B > 0, the correlation is negative, when B < 0, the correlation is positive, and when B = 0, there is no correlation; the fitting coefficient C represents the gradual linear strength of the shear strength with the increase of the shear width under the same normal stress. The shear width x = 0 in the shear strength correction model, and the corrected mapping relationship between the shear strength and the normal stress can be determined. Since A, B and C are constants, the shear strength and the normal stress are one-to-one corresponding.

[0089] The embodiment of the application establishes the mapping relationship between the shear strength and the normal stress and the shear width by creating the shear strength correction model, so that the influence of the shear width on the measurement result can be eliminated, and the measurement accuracy of the shear strength can be improved.

[0090] In some embodiments, the first determining module 310 is specifically configured to:

[0091] import at least three groups of test data into the shear strength correction model to determine an initial mapping relationship among the shear strength, the normal stress and the shear width;

[0092] determine a corrected mapping relationship between the shear strength and the normal stress when the shear width is zero based on the initial mapping relationship.

[0093] In the embodiment, the shear strength correction model is:

[0094] τ = σ n e (A-Bx) + C.

[0095] By inputting the measured at least three groups of shear strength values, normal stress values and shear width values into the shear strength correction model, the specific values of the fitting coefficients A, B and C can be determined.

[0096] In one example, the measured three groups of shear strength values, normal stress values and shear width values are inputted into the shear strength correction model, and based on the obtained fitting coefficients A, B and C, the initial mapping relationship between the shear strength, the normal stress and the shear width is determined.

[0097] In another example, more than three groups of measured shear strength values, normal stress values and shear width values are inputted into the shear strength correction model, the fitting coefficients A, B and C are obtained based on the principle of nonlinear least squares method, and based on this, the initial mapping relationship between the shear strength, the normal stress and the shear width is determined.

[0098] In some embodiments, the second determination module 330 is specifically further configured to:

[0099] Based on the corrected mapping relationship, at least two groups of shear strength values and corresponding normal stress values are determined.

[0100] The shear strength values and the normal stress values are inputted into a preset shear model to determine the mechanical parameters of the rock to be measured, and the mechanical parameters include the cohesion and the internal friction angle of the rock to be measured.

[0101] In an optional embodiment, the preset shear model is:

[0102]

[0103] wherein τ represents the shear strength, σ n represents the normal stress, represents the internal friction angle, and c represents the cohesion of the rock to be measured.

[0104] As described in Table 1 above, at least two groups of shear strength values and corresponding normal stress values are inputted into the preset shear model, so that the cohesion and the internal friction angle of the rock to be measured can be determined to reflect the mechanical properties of the rock to be measured.

[0105] It should be noted that the description of the above shear strength determination device embodiments is similar to the description of the above shear strength determination method embodiments, and has similar beneficial effects as the shear strength determination method embodiments. For technical details not disclosed in the shear strength determination device embodiments of the present application, please refer to the description of the shear strength determination method embodiments of the present application for understanding, which will not be described one by one here.

[0106] The embodiments of the third aspect of the present application provide an electronic device, please refer to Figure 4 , Figure 4A structural diagram of an electronic device is provided in the embodiments of the present application. The electronic device includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor executes the steps of the method of the first aspect.

[0107] The electronic device can be a terminal, a server or similar computing device. The electronic device can have a large difference due to different configurations or performances. The electronic device can include one or more central processing units (CPUs), including but not limited to a microprocessor MCU or a programmable logic device FPGA, a memory for storing data, and one or more storage media (for example, one or more mass storage devices) for storing application programs or data. The memory and the storage medium can be temporary storage or persistent storage. The program stored in the storage medium can include one or more modules, each of which can include a series of instruction operations in the electronic device. Furthermore, the central processing unit can be configured to communicate with the storage medium and execute a series of instruction operations in the storage medium on the electronic device. The electronic device can also include one or more power supplies, one or more wired or wireless network interfaces, one or more input / output interfaces, and / or one or more operating systems, such as Windows Server, Mac OS X, Unix, Linux, FreeBSD, etc. The input / output interface can be used to receive or send data via a network. Specific examples of the above network can include a wireless network provided by a communication provider of the electronic device.

[0108] In one example, the input / output interface includes a network interface controller (NIC) that can be connected to other network devices through a base station so as to communicate with the Internet. In an exemplary embodiment, the input / output interface can be a radio frequency (RF) module for communicating with the Internet in a wireless manner.

[0109] Those of ordinary skill in the art can understand that Figure 4 The structure shown is only a schematic and does not limit the structure of the above-mentioned electronic device. For example, the electronic device can include more or fewer components than those shown in Figure 4 or have a different configuration than that shown in Figure 4 .

[0110] In some embodiments, the embodiments of the present application provide a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the above shear strength determination method are implemented.

[0111] It should be noted that the above electronic device embodiments and storage medium embodiments are similar to the above anti-shear strength determination method embodiments, and have similar beneficial effects as the anti-shear strength determination method embodiments. For technical details not disclosed in the electronic device embodiments and storage medium embodiments of the present application, please refer to the description of the anti-shear strength determination method embodiments of the present application for understanding, which will not be repeated here.

[0112] In several embodiments provided in the present application, it should be understood that the disclosed anti-shear strength determination method, device, system and storage medium can be implemented in other ways. The above described method, device and system embodiments are only illustrative.

[0113] The anti-shear strength determination method, device, electronic device and storage medium described in the embodiments of the present application are only taken as examples, but are not limited thereto, as long as the anti-shear strength determination method, device, electronic device and storage medium are within the protection scope of the present application.

[0114] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the sequence number of the above processes does not mean the execution order, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above sequence number of the embodiments of the present application is only for description, not representing the advantages or disadvantages of the embodiments.

[0115] It should be noted that in this document, the term "comprising" or "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0116] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the modification or replacement within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of determining the shear strength of a material, characterized by, The method comprises the following steps: creating a shear strength correction model; the shear strength correction model is: ; The correction factor of the shear strength correction model comprises shear strength, normal stress and shear width; wherein characterize the shear strength, characterize the normal stress, characterize the shear width, A, B, C are different types of fitting coefficients, and are constants; wherein, the fitting coefficient A reflects the sensitivity degree of the rock shear strength to the sample shear width; the fitting coefficient B characterizes the correlation between the rock shear strength and the sample shear width, and when B>0, the correlation is negative, when B<0, the correlation is positive, and when B=0, there is no correlation; the fitting coefficient C characterizes the gradual linear strength of the shear strength with the increase of the shear width under the same normal stress; based on the shear strength correction model, determining the correction mapping relationship between the shear strength and the normal stress when the shear width is zero, comprising: introducing at least three groups of test data into the shear strength correction model, determining the initial mapping relationship between the shear strength, the normal stress and the shear width; based on the initial mapping relationship, determining the correction mapping relationship between the shear strength and the normal stress when the shear width is zero; based on the correction mapping relationship, determining the shear strength value of the rock to be tested, comprising: based on the correction mapping relationship, determining at least two groups of shear strength values and the normal stress values corresponding to the shear strength values; introducing the shear strength values and the normal stress values into a preset shear model to determine the mechanical parameters of the rock to be tested; the mechanical parameters include the cohesion and internal friction angle of the rock to be tested; wherein the preset shear model is: ; wherein, characterizing the shear strength, characterizing the normal stress, characterizing the internal friction angle, characterizing the cohesion of the rock under test.

2. A shear strength determination apparatus characterized by, The method comprises the following steps: creating a shear strength correction model; the shear strength correction model is: ; The correction factor of the shear strength correction model comprises shear strength, normal stress and shear width; wherein characterize the shear strength, characterize the normal stress, characterize the shear width, A, B, C are different types of fitting coefficients, and are constants; wherein, the fitting coefficient A reflects the sensitivity of the rock shear strength to the shear width of the sample; the fitting coefficient B characterizes the correlation between the rock shear strength and the shear width of the sample, and when B>0, the correlation is negative, when B<0, the correlation is positive, and when B=0, there is no correlation; the fitting coefficient C characterizes the gradual linear strength of the shear strength with the increase of the shear width under the same normal stress; a first determining module for determining the correction mapping relationship between the shear strength and the normal stress when the shear width is zero based on the shear strength correction model; the first determining module is specifically configured to: introduce at least three groups of test data into the shear strength correction model, determine the initial mapping relationship between the shear strength, the normal stress and the shear width; based on the initial mapping relationship, determine the correction mapping relationship between the shear strength and the normal stress when the shear width is zero; a second determining module for determining the shear strength value of the rock to be tested based on the correction mapping relationship; the second determining module is specifically configured to: based on the correction mapping relationship, determine at least two groups of shear strength values and the normal stress values corresponding to the shear strength values; introduce the shear strength values and the normal stress values into a preset shear model to determine the mechanical parameters of the rock to be tested; the mechanical parameters include the cohesion and internal friction angle of the rock to be tested; wherein the preset shear model is: ; wherein, characterizing the shear strength, characterizing the normal stress, characterizing the internal friction angle, characterizing the cohesion of the rock under test.

3. An electronic device comprising a memory and a processor, the memory storing a computer program, the computer program being executed by the processor to perform the steps of the method of claim 1.

4. A computer readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the steps of the method of claim 1.

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