Method and device for judging failure mode of coal-rock combination and electronic equipment

Abstract

The invention provides a method and a device for judging a failure mode of a coal-rock combination and electronic equipment. The method comprises the following steps: acquiring a coal-rock combination sample of a target research area, wherein the coal-rock combination sample comprises a coal-rock sample and a rock sample; based on the size information of the coal rock sample and the rock sample, determining the first instability strength of non-standard size coal and the first instability strength of non-standard size rock in the coal rock combination sample; determining the second instability strength of coal and the second instability strength of rock at the interface of the coal-rock combination sample based on the mechanical properties of the coal-rock combination sample; determining the shear instability strength of the coal-rock combination sample based on the fracture surface of the coal-rock combination sample; and based on the instability strength, determining a target instability failure mode of the coal-rock combination sample. Therefore, the scheme can provide reliable basic data for analyzing the damage characteristics of the coal and rock mass, so that the strength of the coal and rock mass is fully exerted, and the safety and stability of an engineering construction project are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of coal mining, and in particular to a method, device and electronic equipment for determining the failure mode of a coal-rock combination. Background Art

[0002] As the depth of coal mining increases, under the high confining pressure and mining action at depth, the combined structures of primary interfaces and cracks in the coal rock mass make the mechanical properties and deformation and failure modes of the coal rock mass more complex. Especially under the disturbance of large-scale and high-intensity coal mining, high stress loading and unloading drives the primary crack combined structure in the coal rock mass to continuously deform and rupture, resulting in frequent disasters such as water inrush and impact in deep mining, which seriously threatens the safe production of mines and the safety of life and property of employees. Summary of the invention

[0003] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, the first purpose of this application is to propose a method for determining the failure mode of a coal-rock combination, so as to provide reliable basic data for analyzing the failure characteristics of the coal-rock combination, thereby giving full play to the strength of the coal-rock combination itself and ensuring the safety and stability of the engineering construction project.

[0005] The second purpose of the present application is to provide a device for determining the failure mode of a coal-rock combination.

[0006] The third objective of the present application is to provide an electronic device.

[0007] A fourth objective of the present application is to provide a computer-readable storage medium.

[0008] A fifth object of the present application is to provide a computer program product.

[0009] To achieve the above-mentioned purpose, the first aspect of the present application proposes a method for determining the failure mode of a coal-rock combination, comprising: obtaining a coal-rock combination sample in a target study area, the coal-rock combination sample comprising a coal rock body and a rock sample; determining a first instability strength of non-standard-sized coal and a first instability strength of non-standard-sized rock in the coal-rock combination sample based on size information of the coal rock body and the rock sample; determining a second instability strength of coal and a second instability strength of rock at the interface of the coal-rock combination sample based on the mechanical properties of the coal-rock combination sample; determining the shear instability strength of the coal-rock combination sample based on the fracture surface of the coal-rock combination sample; and determining a target instability failure mode of the coal-rock combination sample based on the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength.

[0010] To achieve the above-mentioned purpose, the second embodiment of the present application proposes a device for determining the failure mode of a coal-rock combination, comprising: an acquisition module, used to acquire a coal-rock combination sample in a target research area, the coal-rock combination sample comprising a coal rock sample and a rock sample; a first determination module, used to determine the first instability strength of non-standard-sized coal and the first instability strength of non-standard-sized rock in the coal-rock combination sample based on the size information of the coal rock sample and the rock sample; a second determination module, used to determine the second instability strength of coal and the second instability strength of rock at the interface of the coal-rock combination sample based on the mechanical properties of the coal-rock combination sample; a third determination module, used to determine the shear instability strength of the coal-rock combination sample based on the fracture surface of the coal-rock combination sample; and a fourth determination module, used to determine the target instability failure mode of the coal-rock combination sample based on the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength.

[0011] To achieve the above-mentioned purpose, the third aspect embodiment of the present application proposes an electronic device, comprising: a processor; and a memory connected to the processor in communication; the memory stores computer execution instructions; the processor executes the computer execution instructions stored in the memory, so that the processor can execute the method for determining the failure mode of the coal-rock combination described in the first aspect embodiment.

[0012] To achieve the above-mentioned purpose, the fourth aspect of the present application proposes a computer-readable storage medium on which a computer program is stored, and the computer instructions are used to enable the computer to execute the method for determining the coal-rock combination failure mode described in the first aspect of the embodiment.

[0013] To achieve the above-mentioned purpose, the fifth embodiment of the present application proposes a computer program product, including a computer program, which, when executed by a processor, implements the method for determining the failure mode of a coal-rock combination as described in the first embodiment above.

[0014] The method, device and electronic equipment for determining the failure mode of a coal-rock combination provided in the present application can obtain coal-rock combination samples in the target research area and calculate the first instability strength of coal, the first instability strength of rock, the second instability strength of coal, the second instability strength of rock, and the shear instability strength based on the size information, mechanical properties and generated fracture surfaces of the coal-rock combination samples themselves. Then, the target instability failure mode of the coal-rock combination sample can be determined based on the instability strength, which can provide reliable basic data for analyzing the failure characteristics of the coal rock mass, thereby giving full play to the strength of the coal rock mass itself and ensuring the safety and stability of the engineering construction project.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0017] Figure 1 A schematic flow chart of a method for determining a failure mode of a coal-rock combination provided in an embodiment of the present application;

[0018] Figure 2 A schematic flow chart of another method for determining a failure mode of a coal-rock combination provided in an embodiment of the present application;

[0019] Figure 3 A schematic flow chart of another method for determining a failure mode of a coal-rock combination provided in an embodiment of the present application;

[0020] Figure 4 A schematic flow chart of another method for determining a failure mode of a coal-rock combination provided in an embodiment of the present application;

[0021] Figure 5 A schematic flow chart of another method for determining a failure mode of a coal-rock combination provided in an embodiment of the present application;

[0022] Figure 6 A schematic diagram of a process for determining the instability and failure mode of a coal-rock combination provided in an embodiment of the present application;

[0023] Figure 7 A schematic diagram of the structure of a device for determining the failure mode of a coal-rock combination provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0025] The following describes the method and device for determining the failure mode of a coal-rock combination according to an embodiment of the present application with reference to the accompanying drawings.

[0026] Figure 1 is a flow chart of a method for determining a coal-rock combination failure mode according to an exemplary embodiment. Figure 1 As shown, the method for determining the failure mode of the coal-rock combination in the embodiment of the present application includes but is not limited to the following steps:

[0027] S101, obtaining coal-rock combination samples in the target study area, the coal-rock combination samples including coal rock and rock samples.

[0028] It should be noted that the execution subject of the method for determining the failure mode of a coal-rock combination provided in the embodiment of the present application is an electronic device, which may be a terminal device. Optionally, the terminal device may be a mobile electronic device or a non-mobile electronic device. Exemplarily, the mobile electronic device may be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a personal digital assistant (PDA), etc., and the non-mobile electronic device may be a personal computer (PC), etc. The embodiment of the present application is not specifically limited.

[0029] In some implementations, by determining a target study area to be studied underground in a coal mine and collecting coal and rock in the target study area, a coal-rock combination sample of the target study area can be obtained, and the sample includes coal rock and rock samples.

[0030] S102, based on the size information of the coal rock and the rock sample, determine the first instability strength of the non-standard size coal and the first instability strength of the non-standard size rock in the coal-rock assembly sample.

[0031] In some implementations, the proportions of coal and rock contained in the coal-rock combination sample are different, that is, the coal-rock combination sample is composed of coal and rock samples of different volumes. Since the total volume and diameter of the coal-rock combination sample remain unchanged, the height of the coal sample and the height of the rock sample can be determined according to their respective volumes, and then the first instability strength of non-standard size coal and the first instability strength of non-standard size rock can be calculated according to the height of the coal sample and the height of the rock sample.

[0032] S103, based on the mechanical properties of the coal-rock combination sample, determine the second instability strength of the coal and the second instability strength of the rock at the interface of the coal-rock combination sample.

[0033] It can be understood that the coal sample and the rock sample at the interface of the coal-rock combination sample are subjected to radial deformation and constrained to each other, resulting in changes in the pressure on the coal and rock sides at the interface. Since there is a mutually constrained force between the coal sample and the rock sample, the instability strength can be calculated based on the mechanical properties of the coal-rock combination sample.

[0034] Optionally, the second instability strength of coal and the second instability strength of rock at the interface of the coal-rock assembly sample may be calculated based on the cohesion and internal friction of the coal-rock assembly sample.

[0035] S104, determining the shear instability strength of the coal-rock assembly sample based on the fracture surface of the coal-rock assembly sample.

[0036] It is understandable that under the action of compression, the low-strength coal far from the interface first produces the main fracture crack. Under the fracture extension of this main fracture, the combination produces fracture instability along the coal, rock and their interface, which is equivalent to the rock part being disturbed by the tip of the main fracture that has developed in the low-strength coal, and then breaking, which leads to the overall instability of the combination.

[0037] In other words, the shear instability strength of the coal-rock assembly sample depends on the cracks in the rock and the compressive shear fracture strength of the rock, and conforms to the rock strength theory of fractured structural surfaces derived based on the yield criterion. Therefore, the shear instability strength of the coal-rock assembly sample can be calculated based on the fracture surfaces of the coal-rock assembly sample.

[0038] Alternatively, the shear instability strength can be calculated based on the cohesion and internal friction angle of the fracture surface and the confining pressure to which the coal-rock combination sample is subjected.

[0039] S105, determining a target instability failure mode of the coal-rock combination sample based on the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength.

[0040] In some implementations, the instability failure modes include, but are not limited to: coal instability, rock instability, coal instability at the interface, rock instability at the interface, low-strength coal driving high-strength rock instability, and no instability. The target instability strength of the coal-rock combination sample can be determined by determining the corresponding relationship between different instability failure modes and instability strengths, and from the first instability strength, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength, and then according to the above corresponding relationship, the target instability failure mode of the coal-rock combination sample can be determined.

[0041] In the method for determining the failure mode of a coal-rock combination provided in an embodiment of the present application, by obtaining coal-rock combination samples in the target research area, and based on the size information, mechanical properties and generated fracture surfaces of the coal-rock combination samples themselves, the first instability strength of coal, the first instability strength of rock, the second instability strength of coal, the second instability strength of rock, and the shear instability strength can be calculated. Then, the target instability failure mode of the coal-rock combination sample can be determined based on the instability strength, which can provide reliable basic data for analyzing the failure characteristics of the coal rock mass, thereby giving full play to the strength of the coal rock mass itself and ensuring the safety and stability of the engineering construction project.

[0042] Figure 2 is a flow chart of a method for determining a coal-rock combination failure mode according to an exemplary embodiment. Figure 2 As shown, the method for determining the failure mode of the coal-rock combination in the embodiment of the present application includes but is not limited to the following steps:

[0043] S201, obtaining coal-rock combination samples in the target study area, the coal-rock combination samples including coal rock and rock samples.

[0044] In the embodiment of the present application, the implementation method of step S201 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0045] S202, based on the size information of the coal rock and the rock sample, determine the first instability strength of the non-standard size coal and the first instability strength of the non-standard size rock in the coal-rock assembly sample.

[0046] In the embodiment of the present application, the implementation method of step S202 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0047] S203, based on the mechanical properties of the coal-rock combination sample, determine the second instability strength of the coal and the second instability strength of the rock at the interface of the coal-rock combination sample.

[0048] In the embodiment of the present application, the implementation method of step S203 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0049] S204: Determine the shear instability strength of the coal-rock assembly sample based on the fracture surface of the coal-rock assembly sample.

[0050] In the embodiment of the present application, the implementation method of step S204 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0051] S205, compare the first instability strength of coal, the first instability strength of rock, the second instability strength of coal, the second instability strength of rock, and the shear instability strength, and select the minimum instability strength as the target instability strength of the coal-rock combination sample.

[0052] In some implementations, the range of target instability strength can be determined by comparing and analyzing the first instability strength of coal, the first instability strength of rock, the second instability strength of coal, the second instability strength of rock, and the shear instability strength, and then the minimum instability strength can be selected from the range as the target instability strength of the coal-rock combination sample.

[0053] Optionally, the range of target instability intensity is as follows:

[0054] σ CR =min{σ C ,σ R ,σ 1CG ,σ 1RG ,σ 1R '} (1)

[0055] Among them, σ CR represents the target instability intensity, σ C represents the first instability strength of coal, σ R represents the first instability strength of rock, σ 1CG represents the second instability strength of coal, σ 1RG represents the second instability strength of rock, σ 1R ' represents the shear instability strength.

[0056] S206, determining a target instability failure mode of the coal-rock combination sample based on the target instability strength.

[0057] In some implementations, the target instability failure mode of the coal-rock combination sample can be determined from multiple instability failure modes according to the correspondence between the instability intensity and the instability failure mode and according to the target instability intensity.

[0058] Optionally, in response to the target instability intensity being the first instability intensity of coal, the target instability failure mode is determined to be coal instability; in response to the target instability intensity being the first instability intensity of rock, the target instability failure mode is determined to be rock instability; in response to the target instability intensity being the second instability intensity of coal, the target instability failure mode is determined to be coal instability at the interface; in response to the target instability intensity being the second instability intensity of rock, the target instability failure mode is determined to be rock instability at the interface; in response to the target instability intensity being the shear instability intensity, the target instability failure mode is determined to be low-strength coal driving high-strength rock instability.

[0059] That is, according to formula (1), when σ CR =σ C When σ CR =σ R When σ CR =σ 1CG When σ CR =σ 1RG When σ CR =σ 1R', the coal-rock combination sample is dominated by the low-strength coal driving the high-strength rock to become unstable.

[0060] In the method for determining the failure mode of a coal-rock combination provided in an embodiment of the present application, by obtaining coal-rock combination samples in the target study area, and based on the size information, mechanical properties and generated fracture surfaces of the coal-rock combination samples themselves, the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength can be calculated, and then the minimum instability strength can be determined as the target instability strength, and the target instability failure mode of the coal-rock combination sample can be determined based on the target instability strength, which can provide reliable basic data for analyzing the failure characteristics of the coal rock mass, thereby giving full play to the strength of the coal rock mass itself and ensuring the safety and stability of the engineering construction project.

[0061] Figure 3 is a flow chart of a method for determining a coal-rock combination failure mode according to an exemplary embodiment. Figure 3 As shown, the method for determining the failure mode of the coal-rock combination in the embodiment of the present application includes but is not limited to the following steps:

[0062] S301, obtaining coal-rock combination samples in the target study area, the coal-rock combination samples including coal rock and rock samples.

[0063] In the embodiment of the present application, the implementation method of step S301 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0064] S302, determining the height of the coal sample and the height of the rock sample based on the proportion information of the coal sample and the proportion information of the rock sample in the coal-rock combination sample, as well as the diameter and total height of the coal-rock combination sample.

[0065] In some implementations, the volume of the coal sample and the volume of the rock sample in the coal-rock combination sample are determined, and the respective volumes are used as the proportion information of the coal sample and the proportion information of the rock sample. If the total volume, total height and diameter of the coal-rock combination sample remain unchanged, the height of the coal sample and the height of the rock sample can be calculated according to the volume calculation formula.

[0066] S303, determining a first instability strength of the coal and a first instability strength of the rock based on the height of the coal sample and the height of the rock sample and the compressive strength of a standard coal-rock combination.

[0067] In some implementations, the compressive strength of the non-standard-sized coal-rock assembly may be calculated based on the diameter and height of the non-standard-sized coal-rock assembly combined with the compressive strength of a standard-sized coal-rock assembly sample, and the compressive strength may be used as the instability strength.

[0068] Alternatively, the formula for calculating the compressive strength of a coal-rock assembly sample of non-standard size is as follows:

[0069] σ NS =(7+2D / H NS )σ S / 8 (2)

[0070] Among them, σ NS represents the compressive strength of coal-rock combination samples of non-standard size, σ S Indicates the compressive strength of coal-rock combination samples of standard size, D, H NS They represent the diameter and height of the non-standard size coal-rock combination. When the coal-rock combination is a standard size sample, H NS / D=2.

[0071] Optionally, based on formula (2), the first instability strength of coal and the first instability strength of rock can be calculated in combination with the height of the coal sample and the height of the rock sample, and the compressive strength of the standard coal-rock combination. The calculation formula is as follows:

[0072] σ C =[7+2D / (P C H)]σ CS / 8 (3)

[0073] σ R =[7+2D / (P R H)]σ RS / 8 (4)

[0074] Among them, σ C represents the first instability strength of coal, σ R represents the first instability strength of rock, D represents the diameter of the coal-rock combination sample, P C H represents the high of coal sample, P R H represents the height of the rock sample, σ CS Indicates the compressive strength of standard size coal, σ RS Indicates the compressive strength of rock of standard size.

[0075] Alternatively, the compressive strength of coal of standard size and the compressive strength of rock of standard size can be determined by performing triaxial compression test on the coal-rock combination of standard size. Alternatively, the triaxial compression test can be performed on the coal-rock combination according to the confining pressure σ3 of the target research area itself to obtain σ CS and σ RS .

[0076] Alternatively, when the height to diameter ratio H / D=2, based on formula (3) and formula (4), the compressive strength of the non-standard sized coal-rock assembly sample can be determined to be higher than the compressive strength of the standard sized coal-rock assembly.

[0077] S304, based on the mechanical properties of the coal-rock combination sample, determine the second instability strength of the coal and the second instability strength of the rock at the interface of the coal-rock combination sample.

[0078] In the embodiment of the present application, the implementation method of step S304 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0079] S305, determining the shear instability strength of the coal-rock assembly sample based on the fracture surface of the coal-rock assembly sample.

[0080] In the embodiment of the present application, the implementation method of step S305 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0081] S306, determining a target instability failure mode of the coal-rock combination sample based on the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength.

[0082] In the embodiment of the present application, the implementation method of step S306 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0083] In the method for determining the failure mode of a coal-rock combination provided in an embodiment of the present application, by acquiring coal-rock combination samples in a target study area and determining the height of the coal sample and the height of the rock sample based on the proportion information of the coal-rock combination samples, the first instability strength of the coal and the first instability strength of the rock can be calculated. According to the mechanical properties of the coal-rock combination samples and the resulting fracture surface, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength can be calculated. According to the instability strength, the target instability failure mode of the coal-rock combination sample can be determined, which can provide reliable basic data for analyzing the failure characteristics of the coal rock mass, thereby giving full play to the strength of the coal rock mass itself and ensuring the safety and stability of the engineering construction project.

[0084] Figure 4 is a flow chart of a method for determining a coal-rock combination failure mode according to an exemplary embodiment. Figure 4 As shown, the method for determining the failure mode of the coal-rock combination in the embodiment of the present application includes but is not limited to the following steps:

[0085] S401, obtaining coal-rock combination samples in the target study area, the coal-rock combination samples including coal rock and rock samples.

[0086] In the embodiment of the present application, the implementation method of step S401 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0087] S402, based on the size information of the coal rock and the rock sample, determine the first instability strength of the non-standard size coal and the first instability strength of the non-standard size rock in the coal-rock assembly sample.

[0088] In the embodiment of the present application, the implementation method of step S402 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0089] S403, determine the cohesion and internal friction characteristic coefficients of the coal-rock combination sample.

[0090] In some implementations, a triaxial compression test can be performed on the coal-rock combination sample to determine the first compressive strength and the second compressive strength of the coal-rock combination sample under any confining pressure and the confining pressure of the target study area itself, respectively. Based on the first compressive strength and the second compressive strength, the influence coefficient of the confining pressure on the compressive strength can be calculated, and based on the influence coefficient, the internal friction angle of the coal-rock combination sample can be calculated, and based on the internal friction angle and the uniaxial compressive strength of the coal-rock combination sample, the cohesion of the coal-rock combination sample can be calculated.

[0091] For example, let any confining pressure be σ 30 , the confining pressure of the target study area itself is σ3, and the uniaxial compressive strength is σ c , the first compressive strength is σ 10 , the second compressive strength is σ1. Then, the influence coefficient k of the confining pressure on the compressive strength can be calculated, and k = (σ1-σ 10 ) / (σ3-σ 30 ).

[0092] Furthermore, the internal friction angle can be calculated based on the influence coefficient k: The calculation formula is as follows:

[0093]

[0094] Furthermore, based on the internal friction angle and uniaxial compressive strength σ c , calculate the cohesion c j , the calculation formula is as follows:

[0095]

[0096] Among them, j can indicate C and R, C represents coal and R represents rock.

[0097] In some implementations, after determining the internal friction angle, the internal friction characteristic coefficient of the coal-rock combination sample can be calculated according to the internal friction angle of the coal-rock combination sample. Alternatively, the internal friction characteristic coefficient of the coal sample and the internal friction characteristic coefficient of the rock sample can be calculated separately.

[0098] For example, assume that the internal friction coefficient of the coal sample is A C , the internal friction coefficient of the rock sample is A R , then according to the internal friction angle Calculate A C and A R ,

[0099] S404, determine the deformation bond constraint coefficient of the coal-rock combination sample.

[0100] In some implementations, the deformation bond constraint coefficient of the coal-rock combination sample can be calculated based on the elastic modulus and Poisson's ratio of the coal-rock combination sample. Optionally, by performing a uniaxial compression test on the coal-rock combination sample, the elastic modulus of the coal sample, the elastic modulus of the rock sample, the Poisson's ratio of the coal sample, and the Poisson's ratio of the rock sample when the coal-rock combination sample is destroyed are determined respectively. Then, the deformation bond constraint coefficient can be determined based on the elastic modulus of the coal sample, the elastic modulus of the rock sample, the Poisson's ratio of the coal sample, and the Poisson's ratio of the rock sample.

[0101] Optionally, the formula for calculating the deformation bond constraint coefficient is as follows:

[0102]

[0103] Among them, k i represents the deformation bond constraint coefficient, i=1,2,3, E C represents the elastic modulus of the coal sample, E R represents the elastic modulus of the rock sample, μ C represents the Poisson's ratio of the coal sample, μ R represents the Poisson's ratio of the rock sample, and E C <E R , μ C >μ R .

[0104] S405, determining the second instability strength of coal and the second instability strength of rock based on the cohesion, the internal friction characteristic coefficient and the deformation adhesion constraint coefficient.

[0105] Optionally, the formula for calculating the second instability strength of coal and the second instability strength of rock is as follows:

[0106]

[0107] Among them, σ 1CG represents the second instability strength of coal, σ 1RG Indicates the second instability strength of rock, k i represents the deformation bond constraint coefficient, i=1,2,3, C C , C R Respectively represent the cohesion of coal sample and rock sample, A C , A R Represent the internal friction characteristic coefficients of coal samples and rock samples respectively.

[0108] In some implementations, formula (8) calculates the instability strength at the interface. If the coal-rock combination sample is far away from the interface, the confining pressure of the coal-rock combination sample is no longer affected by the radial deformation and bonding constraints of the interface, then the instability strengths of the coal sample and the rock sample still meet the yield strength conditions. Let the instability strength of the coal far away from the interface be σ 1C * , the instability strength of the rock far away from the interface is σ 1R * , then the calculation formula of the instability strength is as follows:

[0109] σ 1C * =σ CS , σ 1R * =σ RS (9)

[0110] Among them, σ CS , σ RS They represent the compressive strength of standard-sized coal and standard-sized rock respectively.

[0111] S406, determining the shear instability strength of the coal-rock assembly sample based on the fracture surface of the coal-rock assembly sample.

[0112] In the embodiment of the present application, the implementation method of step S406 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0113] S407, determining a target instability failure mode of the coal-rock combination sample based on the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength.

[0114] In the embodiment of the present application, the implementation method of step S407 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0115] In the method for determining the failure mode of a coal-rock combination provided in an embodiment of the present application, by acquiring coal-rock combination samples in the target study area and based on the size information of the coal-rock combination samples themselves, the first instability strength of the coal and the first instability strength of the rock can be calculated, and based on the cohesion and internal friction characteristic coefficients, the second instability strength of the coal and the second instability strength of the rock can be calculated, and based on the fracture surface generated by the coal-rock combination samples, the shear instability strength can be calculated, and then the target instability failure mode of the coal-rock combination sample can be determined based on the instability strength, which can provide reliable basic data for analyzing the failure characteristics of the coal rock mass, thereby giving full play to the strength of the coal rock mass itself and ensuring the safety and stability of the engineering construction project.

[0116] Figure 5 is a flow chart of a method for determining a coal-rock combination failure mode according to an exemplary embodiment. Figure 5 As shown, the method for determining the failure mode of the coal-rock combination in the embodiment of the present application includes but is not limited to the following steps:

[0117] S501, obtaining coal-rock combination samples in the target study area, the coal-rock combination samples including coal rock and rock samples.

[0118] In the embodiment of the present application, the implementation method of step S501 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0119] S502, based on the size information of the coal rock and the rock sample, determine the first instability strength of the non-standard size coal and the first instability strength of the non-standard size rock in the coal-rock assembly sample.

[0120] In the embodiment of the present application, the implementation method of step S502 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0121] S503, based on the mechanical properties of the coal-rock combination sample, determine the second instability strength of the coal and the second instability strength of the rock at the interface of the coal-rock combination sample.

[0122] In the embodiment of the present application, the implementation method of step S503 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0123] S504, determine the cohesion and internal friction angle of the crack surface.

[0124] In some implementations, the cohesion of the coal-rock combination sample can be calculated based on the above formula (6) as the cohesion of the fracture surface, and the internal friction angle of the coal-rock combination sample can be calculated according to the above formula (5) as the internal friction angle of the fracture surface.

[0125] S505, determining the angle between the fracture surface and the target research area.

[0126] S506, determining the shear instability strength based on the cohesion, the internal friction angle and the included angle.

[0127] In some implementations, triaxial compression tests can be performed on coal-rock assembly samples according to the confining pressure of the target study area itself, where the confining pressure has a direction, representing the stress in the horizontal direction. The angle between the fracture surface and the horizontal stress can be obtained, and the angle can be used as the angle between the fracture surface and the target study area.

[0128] Further, the shear instability strength can be calculated based on the cohesion, internal friction angle and included angle. Optionally, the formula for calculating the shear instability strength is as follows:

[0129]

[0130] Among them, σ 1R ' represents the shear instability strength, c j represents cohesion, β represents the angle between the fracture surface and the target research area, represents the internal friction angle, and σ3 represents the confining pressure in the target study area.

[0131] S507, determining a target instability failure mode of the coal-rock combination sample based on the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength.

[0132] In the embodiment of the present application, the implementation method of step S507 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0133] In some implementations, it is also possible to determine whether the coal-rock combination sample is unstable based on the angle between the fracture surface of the coal-rock combination sample and the target research area. Optionally, it is possible to determine whether the coal-rock combination sample is unstable by comparing the angle with an angle threshold. In response to the angle being greater than a first angle threshold, or the angle being less than a second angle threshold, it is determined that the coal-rock combination sample is not unstable.

[0134] In the method for determining the failure mode of a coal-rock combination provided in an embodiment of the present application, by obtaining coal-rock combination samples in the target research area, and based on the size information, mechanical properties and generated fracture surfaces of the coal-rock combination samples themselves, the first instability strength of coal, the first instability strength of rock, the second instability strength of coal, the second instability strength of rock, and the shear instability strength can be calculated. Then, the target instability failure mode of the coal-rock combination sample can be determined based on the instability strength, which can provide reliable basic data for analyzing the failure characteristics of the coal rock mass, thereby giving full play to the strength of the coal rock mass itself and ensuring the safety and stability of the engineering construction project.

[0135] like Figure 6 The schematic diagram of the process of determining the instability failure mode of coal-rock combination is shown in FIG. Figure 6 As shown, the calculation method for calculating different instability strengths can be predetermined and built into a microcomputer. By obtaining the confining pressure, axial stress and other conditions of the coal-rock combination whose instability failure mode is to be determined, the instability strength of the coal and rock in each part of the coal-rock combination can be quickly calculated by the computer, and the instability failure mode can be determined based on its size.

[0136] By selecting the target research area and collecting coal-rock combination samples in the target research area, the axial stress and mechanical parameters of coal and rock are determined through experiments. Among them, the axial stress includes: uniaxial compressive strength, triaxial compressive strength; the mechanical parameters include but are not limited to: elastic modulus, Poisson's ratio, internal friction angle, cohesion, etc.

[0137] Furthermore, the calculation method of determining the first instability strength of non-standard size coal and the first instability strength of non-standard size rock in the coal-rock combination sample, the calculation method of determining the second instability strength of coal and the second instability strength of rock at the interface of the coal-rock combination sample, and the calculation method of determining the shear instability strength of the coal-rock combination sample. The above method is embedded in the computer by writing a calculation program, and the instability strength of each part of the coal-rock combination is quickly calculated by the computer, and its instability failure mode can be determined according to its size.

[0138] In order to implement the above-mentioned embodiment, the present application also proposes a device for determining the failure mode of a coal-rock combination.

[0139] Figure 7 A schematic diagram of the structure of a device for determining the failure mode of a coal-rock combination provided in an embodiment of the present application.

[0140] like Figure 7 As shown, the coal-rock combination failure mode determination device 700 includes:

[0141] An acquisition module 701 is used to acquire coal-rock combination samples in a target research area, wherein the coal-rock combination samples include coal-rock bodies and rock samples;

[0142] A first determination module 702 is used to determine the first instability strength of non-standard size coal and the first instability strength of non-standard size rock in the coal-rock combination sample based on the size information of the coal-rock sample and the rock sample;

[0143] A second determination module 703 is used to determine the second instability strength of coal and the second instability strength of rock at the interface of the coal-rock combination sample based on the mechanical properties of the coal-rock combination sample;

[0144] A third determination module 704 is used to determine the shear instability strength of the coal-rock combination sample based on the fracture surface of the coal-rock combination sample;

[0145] The fourth determination module 705 is used to determine the target instability failure mode of the coal-rock combination sample based on the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength.

[0146] In a possible implementation of an embodiment of the present application, the fourth determination module 705 is also used to: compare the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength, and select the minimum instability strength therefrom as the target instability strength of the coal-rock combination sample; based on the target instability strength, determine the target instability failure mode of the coal-rock combination sample.

[0147] In a possible implementation of the embodiment of the present application, the fourth determination module 705 is also used to: in response to the target instability intensity being the first instability intensity of coal, determine the target instability failure mode as coal instability; in response to the target instability intensity being the first instability intensity of rock, determine the target instability failure mode as rock instability; in response to the target instability intensity being the second instability intensity of coal, determine the target instability failure mode as coal instability at the interface; in response to the target instability intensity being the second instability intensity of rock, determine the target instability failure mode as rock instability at the interface; in response to the target instability intensity being the shear instability intensity, determine the target instability failure mode as low-strength coal driving high-strength rock instability.

[0148] In a possible implementation of the embodiment of the present application, the first determination module 702 is further used to: determine the height of the coal sample and the height of the rock sample based on the proportion information of the coal sample and the proportion information of the rock sample in the coal-rock combination sample, and the diameter and total height of the coal-rock combination sample; determine the first instability strength of the coal and the first instability strength of the rock based on the height of the coal sample and the height of the rock sample, and the compressive strength of the standard coal-rock combination.

[0149] In a possible implementation of an embodiment of the present application, the second determination module 703 is also used to: determine the cohesion and internal friction characteristic coefficients of the coal-rock combination sample; determine the deformation adhesion constraint coefficient of the coal-rock combination sample; and determine the second instability strength of the coal and the second instability strength of the rock based on the cohesion, the internal friction characteristic coefficient and the deformation adhesion constraint coefficient.

[0150] In a possible implementation of an embodiment of the present application, the third determination module 704 is also used to: determine the cohesion and internal friction angle of the fracture surface; determine the angle between the fracture surface and the target research area; and determine the shear instability strength based on the cohesion, the internal friction angle and the angle.

[0151] In a possible implementation of the embodiment of the present application, the device also includes: judging whether the coal-rock combination sample is unstable based on the angle between the fracture surface of the coal-rock combination sample and the target research area; in response to the angle being greater than a first angle threshold, or the angle being less than a second angle threshold, determining that the coal-rock combination sample is not unstable.

[0152] In the device for determining the failure mode of a coal-rock combination provided in the embodiment of the present application, by acquiring coal-rock combination samples in the target research area and based on the size information, mechanical properties and generated fracture surfaces of the coal-rock combination samples themselves, the first instability strength of coal, the first instability strength of rock, the second instability strength of coal, the second instability strength of rock, and the shear instability strength can be calculated. Then, the target instability failure mode of the coal-rock combination sample can be determined based on the instability strength, which can provide reliable basic data for analyzing the failure characteristics of the coal rock mass, thereby giving full play to the strength of the coal rock mass itself and ensuring the safety and stability of the engineering construction project.

[0153] It should be noted that the above explanation of the embodiment of the method for determining the failure mode of a coal-rock combination is also applicable to the device for determining the failure mode of a coal-rock combination in this embodiment, and will not be repeated here.

[0154] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the above embodiments.

[0155] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0156] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0157] The collection, storage, use, processing, transmission, provision and application of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0158] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0159] This application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, this application is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, risks can be minimized by limiting data collection and deleting data. In addition, when applicable, personal identifiers are removed from such personal information to protect the privacy of users.

[0160] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0161] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0162] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0163] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0164] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0165] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0166] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0167] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for determining the failure mode of a coal-rock combination, characterized in that: The method comprises: Obtaining coal-rock combination samples in the target study area, wherein the coal-rock combination samples include coal rock and rock samples; Determine the first instability strength of non-standard size coal and the first instability strength of non-standard size rock in the coal-rock assembly sample based on the size information of the coal-rock sample and the rock sample; Determine the second instability strength of coal and the second instability strength of rock at the interface of the coal-rock combination sample based on the mechanical properties of the coal-rock combination sample; Determining the shear instability strength of the coal-rock assembly sample based on the fracture surface of the coal-rock assembly sample; Based on the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength, a target instability failure mode of the coal-rock assembly sample is determined.

2. The method according to claim 1, characterized in that The method of determining a target instability failure mode of the coal-rock combination sample based on the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength comprises: Compare the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength, and select the minimum instability strength as the target instability strength of the coal-rock combination sample; Based on the target instability strength, a target instability failure mode of the coal-rock assembly sample is determined.

3. The method according to claim 2, characterized in that Determining a target instability failure mode of the coal-rock combination sample based on the target instability strength includes: In response to the target instability intensity being the first instability intensity of coal, determining the target instability failure mode to be coal instability; In response to the target instability intensity being the first instability intensity of rock, determining the target instability failure mode to be rock instability; In response to the target instability intensity being the second instability intensity of coal, determining the target instability failure mode to be coal instability at the interface; In response to the target instability intensity being the second instability intensity of rock, determining the target instability failure mode to be rock instability at the interface; In response to the target instability strength being the shear instability strength, the target instability failure mode is determined to be low-strength coal driving high-strength rock instability.

4. The method according to any one of claims 1 to 3, characterized in that The determining, based on the size information of the coal and rock sample and the rock sample, the first instability strength of the non-standard size coal and the first instability strength of the non-standard size rock in the coal-rock combination sample comprises: Determine the height of the coal sample and the height of the rock sample based on the proportion information of the coal sample and the proportion information of the rock sample in the coal-rock combination sample, as well as the diameter and the total height of the coal-rock combination sample; Based on the height of the coal sample and the height of the rock sample, and the compressive strength of a standard coal-rock combination, a first buckling strength of the coal and a first buckling strength of the rock are determined.

5. The method according to any one of claims 1 to 3, characterized in that: The method of determining the second instability strength of coal and the second instability strength of rock at the interface of the coal-rock combination sample based on the mechanical properties of the coal-rock combination sample comprises: determining the internal cohesion and internal friction characteristic coefficients of the coal-rock combination sample; determining a deformation bond constraint coefficient of the coal-rock combination sample; Based on the cohesion, the internal friction characteristic coefficient and the deformation bonding constraint coefficient, the second instability strength of the coal and the second instability strength of the rock are determined.

6. The method according to any one of claims 1 to 3, characterized in that The method of determining the shear instability strength of the coal-rock assembly sample based on the fracture surface of the coal-rock assembly sample comprises: determining the cohesion and internal friction angle of the fracture surface; Determining the angle between the fracture surface and the target research area; The shear instability strength is determined based on the cohesion, the internal friction angle and the included angle.

7. The method according to claim 1, characterized in that The method further comprises: Based on the angle between the fracture surface of the coal-rock combination sample and the target research area, judging whether the coal-rock combination sample is unstable; In response to the angle being greater than a first angle threshold, or the angle being less than a second angle threshold, it is determined that the coal-rock combination sample is not unstable.

8. A device for determining the failure mode of a coal-rock combination, characterized in that: The device comprises: An acquisition module is used to acquire coal-rock combination samples in a target research area, wherein the coal-rock combination samples include coal-rock bodies and rock samples; A first determination module is used to determine the first instability strength of non-standard size coal and the first instability strength of non-standard size rock in the coal-rock combination sample based on the size information of the coal-rock sample and the rock sample; A second determination module is used to determine the second instability strength of coal and the second instability strength of rock at the interface of the coal-rock combination sample based on the mechanical properties of the coal-rock combination sample; A third determination module is used to determine the shear instability strength of the coal-rock combination sample based on the fracture surface of the coal-rock combination sample; The fourth determination module is used to determine the target instability failure mode of the coal-rock combination sample based on the first instability strength of the coal, the first instability strength of the rock, the second instability strength of the coal, the second instability strength of the rock, and the shear instability strength.

9. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 7 when executed by a processor.

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