Analysis Method, Device and Electronic Equipment for Intensity of Coal and Rock Ejection

Abstract

The present invention provides a method, device and electronic equipment for analyzing the severity of coal and rock ejection. The method for analyzing the severity of coal and rock ejection includes: obtaining the axial strain value, axial stress value and time data of a coal and rock sample during the pressure loading process, and then calculating the dynamic failure time of the coal and rock sample; further, according to the axial stress value and its corresponding axial strain value, obtaining the slope corresponding to each axial stress value in the stage of the axial stress decreasing with the axial strain; if the absolute values of the slopes of a continuous plurality of axial stress values are all greater than or equal to a preset change threshold, recording the change duration experienced by the continuous decreasing stage corresponding to the plurality of axial stress values; based on the time factor operation model, processing the dynamic failure time and the change duration to obtain a dynamic time factor. The present invention can quantitatively and standardly reflect the severity of the ejection dynamic disaster of coal and rock, and improve the early warning accuracy rate of dynamic disaster accidents such as rock bursts.

Description

Technical Field

[0001] The present invention relates to the technical field of rock mechanics analysis, and particularly relates to a method for analyzing the severity of coal and rock ejection, a device for analyzing the degree of coal and rock ejection, and an electronic device. Background Art

[0002] During the coal mining process, when coal has a high impact tendency, a large amount of elastic energy will accumulate inside it. Once the energy reaches the critical value, the coal and rock will suddenly break, accompanied by a strong ejection phenomenon, which will not only damage the coal mining equipment but also pose a serious threat to the lives and safety of workers. Therefore, analyzing the ejection degree of coal and rock can predict the impact tendency and intensity of rock bursts, which helps to formulate preventive measures. Summary of the Invention

[0003] The present invention is based on the inventor's discovery and recognition of the following facts and problems:

[0004] In the process of rock mechanics analysis, the operator can capture the ejection process during the loading process through a high-speed camera or a laser velocity measurement device to obtain the velocity data of the ejected blocks. At the same time, the ejection distance of the ejected blocks can also be marked to infer the severity of the ejection. Generally speaking, a long ejection distance indicates high energy and a high severity. Even in some experiments, the operator can judge the severity of the ejection behavior by the degree of fragmentation of the coal and rock after fragmentation. The higher the degree of fragmentation, the more severe the ejection is reflected indirectly. However, the judgment based on the ejection distance and fragment size after fragmentation, although it can have a certain observation and understanding of the ejection phenomenon and results, ignores the evolution process of the ejection behavior on the time scale, limiting the in-depth understanding and prediction of the essence of the ejection severity.

[0005] Therefore, the embodiments of the present invention provide a method for analyzing the severity of coal and rock ejection, a device for analyzing the degree of coal and rock ejection, and an electronic device, which can quantitatively and standardly reflect the severity of the ejection dynamic disaster of coal and rock, improve the early warning accuracy of dynamic disaster accidents such as rock bursts, and make early safety protection preparations.

[0006] The method for analyzing the severity of coal and rock ejection provided by the embodiments of the present invention includes the following steps:

[0007] Obtain the axial strain value, axial stress value, and time data of the coal and rock sample during the pressure loading process, and the axial stress value corresponds to the axial stress value one by one;

[0008] Calculate the dynamic failure time of the coal and rock sample according to the axial stress value and the time data;

[0009] According to the axial stress value and its corresponding axial strain value, obtain the slope corresponding to each axial stress value in the stage where the axial stress decreases with the axial strain.

[0010] If the absolute values of the slopes of continuously multiple axial stress values are all greater than or equal to a preset change threshold, record the change duration experienced in the continuous decline stage corresponding to the multiple axial stress values.

[0011] Based on a preset time factor operation model, process the dynamic failure time and the change duration to obtain the dynamic time factor of the coal and rock sample. The dynamic time factor of the coal and rock sample is proportional to the intensity of ejection of the coal and rock sample.

[0012] In summary, the method for analyzing the intensity of coal and rock ejection provided by the embodiments of the present invention reflects the intensity of the ejection dynamic disaster of coal and rock through the dynamic time factor, and can use quantification and standardization to reflect the intensity of the ejection dynamic disaster of coal and rock, improve the early warning accuracy of dynamic disaster accidents such as rock bursts, and make safety protection preparations in advance.

[0013] In some embodiments, the step of obtaining the axial strain value, axial stress value, and time data of the coal and rock sample during the pressure loading process includes:

[0014] Obtain the axial pressure value borne by the coal and rock sample during the pressure loading process and the cross-sectional area value of the coal and rock sample.

[0015] According to the axial pressure value and the cross-sectional area value, calculate the axial stress value borne by the coal and rock sample during the pressure loading process. The axial stress value is the ratio of the axial pressure value to the cross-sectional area value.

[0016] And / or, the step of calculating the dynamic failure time of the coal and rock sample according to the axial stress value and the time data includes:

[0017] According to the axial strain value and time data of the coal and rock sample during the pressure loading process, obtain the axial stress peak value and the peak time corresponding to the axial stress peak value.

[0018] According to the axial strain value and time data of the coal and rock sample during the pressure loading process, obtain the critical time when the axial stress value is zero.

[0019] According to the peak time and the critical time, calculate the dynamic failure time of the coal and rock sample. The dynamic failure time is the time difference between the peak time and the critical time.

[0020] In some embodiments, the time factor operation model at least includes a dynamic time factor algorithm, and the dynamic time factor algorithm includes that the dynamic time factor is the ratio of the sum of all change durations in the axial stress drop stage of the coal and rock sample to the dynamic failure time with respect to the axial strain.

[0021] In some embodiments, the method for analyzing the severity of coal and rock ejection further includes the steps of:

[0022] Obtain the stress peak value and the elastic modulus of the coal and rock sample according to the axial stress value and its corresponding axial strain value of the coal and rock sample during the pressure loading process;

[0023] According to the stress peak value, obtain the first continuous decline stage after the stress peak value in multiple continuous decline stages of the coal and rock sample during the pressure loading process, and determine the stress value and strain value at the end point of the first continuous decline stage;

[0024] Calculate the unloading modulus of the coal and rock sample according to the stress value and strain value at the end point of the first continuous decline stage;

[0025] Based on a preset ejection impact model, process the stress value at the end point of the first continuous decline stage, the unloading modulus, the elastic modulus, and the change duration corresponding to the first continuous decline stage to obtain the ejection impact rate of the coal and rock sample within the first continuous decline stage, and the ejection impact rate is proportional to the severity of the coal and rock sample.

[0026] In some embodiments, the ejection impact model at least includes an impact rate operation formula, and the impact rate operation formula is set as:

[0027] ;

[0028] In the formula: is the ejection impact rate; is the stress value at the starting end point of the first continuous decline stage; is the stress value at the termination end point of the first continuous decline stage; E is the elastic modulus; is the unloading modulus.

[0029] In some embodiments, the step of obtaining the stress peak value and the elastic modulus of the coal and rock sample according to the axial stress value and its corresponding axial strain value of the coal and rock sample during the pressure loading process includes:

[0030] Obtain 4 groups of axial stress values and their corresponding axial strain values according to the axial stress value and the corresponding axial strain value;

[0031] Based on four sets of axial stress values and the corresponding axial strain values, calculate the stage elastic moduli between adjacent pairs among the four sets of axial stress values and the corresponding axial strain values;

[0032] According to the stage elastic moduli, calculate the elastic modulus of the coal and rock sample, and the elastic modulus is the average value of the stage elastic moduli.

[0033] In some embodiments, the method for analyzing the severity of coal and rock ejection further includes the steps of:

[0034] Obtain the dynamic time factors of two coal and rock samples;

[0035] If the dynamic time factor of one of the two coal and rock samples is within the offset range of the dynamic time factor of the other, then perform the step of processing the stress values at the two endpoints of the first continuous descent stage, the unloading modulus, and the elastic modulus based on a preset ejection impact model to obtain the ejection impact rate of the coal and rock sample within the first continuous descent stage, where the offset range is set between (1 - a) times the dynamic time factor and (1 + a) times the dynamic time factor, and a is not equal to zero.

[0036] In some embodiments, the step of obtaining the slope corresponding to each axial stress value in the stage where the axial stress decreases with the axial strain according to the axial stress value and its corresponding axial strain value includes:

[0037] Construct a relationship line between axial stress and axial strain according to the axial stress value and the axial strain value corresponding to the axial stress value;

[0038] According to the relationship line between axial stress and axial strain, determine the stage where the axial stress value decreases with the axial strain value during the pressure loading process of the coal and rock sample, and calculate the slope corresponding to each axial stress value in the descent stage.

[0039] In addition, the device for analyzing the severity of coal and rock ejection provided by the embodiments of the present invention includes:

[0040] An acquisition module, which is used to acquire the axial strain value, axial stress value, and time data of the coal and rock sample during the pressure loading process, and the axial stress value corresponds to the axial stress value one by one;

[0041] A dynamic failure time calculation module, which is used to calculate the dynamic failure time of the coal and rock sample according to the axial stress value and the time data;

[0042] A variable duration calculation module, which is configured to obtain the slope corresponding to each axial stress value in the stage of the axial stress decreasing with the axial strain according to the axial stress value and its corresponding axial strain value; if the absolute values of the slopes of a continuous plurality of axial stress values are greater than or equal to a preset change threshold, record the change duration experienced in the continuous decreasing stage corresponding to the plurality of axial stress values.

[0043] A time factor calculation module, which is provided with a time factor calculation model. The time factor calculation module is configured to process the dynamic failure time and the change duration according to the time factor calculation model to obtain the dynamic time factor of the coal and rock sample, and the dynamic time factor of the coal and rock sample is proportional to the intensity of ejection of the coal and rock sample.

[0044] In addition, the electronic device provided in the embodiment of the present invention includes a processor and a memory. The memory stores machine-readable instructions executable by the processor. When the machine-readable instructions are executed by the processor, the steps in the coal and rock ejection intensity analysis method provided in any one of the above embodiments are executed. Description of the Drawings

[0045] Figure 1 is a schematic flowchart of the coal and rock ejection intensity analysis method provided in an embodiment of the present invention.

[0046] Figure 2 is a schematic diagram of the axial stress and axial strain curve in the coal and rock ejection intensity analysis method provided in an embodiment of the present invention.

[0047] Figure 3 is a schematic diagram of the division of the continuous decreasing stage in the coal and rock ejection intensity analysis method provided in an embodiment of the present invention.

[0048] Figure 4 is a schematic diagram of the division of the first continuous decreasing stage in the coal and rock ejection intensity analysis method provided in an embodiment of the present invention.

[0049] Figure 5 is a schematic structural diagram of the coal and rock ejection intensity analysis device provided in an embodiment of the present invention.

[0050] Figure 6 is a schematic structural diagram of the electronic device provided in an embodiment of the present invention.

[0051] Reference Signs:

[0052] 110, acquisition module; 120, dynamic failure time calculation module; 130, variable duration calculation module; 140, time factor calculation module;

[0053] 210. Processor; 220. Memory; 230. Communication interface; 240. Communication bus. Detailed implementation manners

[0054] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0055] Referring to Figure 1 , which is a schematic flowchart of a method for analyzing the severity of coal and rock ejection provided by an embodiment of the present invention. The method for analyzing the severity of coal and rock ejection provided by the embodiment of the present invention includes the following steps:

[0056] S10. Obtain the axial strain value, axial stress value and time data of the coal and rock sample during the pressure loading process, and the axial stress value corresponds to the axial stress value one by one.

[0057] Among them, during the pressure loading process, by applying a gradually increasing pressure to the coal and rock sample and recording the axial strain value, axial stress value and time data during the whole process, it is convenient to analyze the severity of the coal and rock sample ejection subsequently.

[0058] S20. Calculate the dynamic failure time of the coal and rock sample according to the axial stress value and the time data.

[0059] Among them, the dynamic failure time is the time experienced by the axial stress value of the coal and rock sample from the stress peak to zero during the pressure loading process. The dynamic failure time can reflect the speed of the coal and rock sample to resist external forces until failure.

[0060] S30. Obtain the slope corresponding to each axial stress value in the stage of the axial stress decreasing with the axial strain according to the axial stress value and its corresponding axial strain value.

[0061] Among them, the slope corresponding to each axial stress value, that is, the slope of each axial stress value relative to its previous stress value during the decreasing process, and the slope can reflect the rate of change of the axial stress with the axial strain.

[0062] S40. If the absolute values of the slopes of a continuous plurality of axial stress values are all greater than or equal to a preset change threshold, record the change duration experienced by the continuous decreasing stage corresponding to the plurality of axial stress values.

[0063] That is to say, based on the slope analysis, a preset change threshold is set to identify the area where the slope changes significantly in the stress-strain relationship. When the absolute values ​​of the slopes of multiple consecutive axial stress values ​​are greater than or equal to this threshold, it is considered that the coal rock sample is in a violent stress release and destruction process, and the length of time experienced in the continuous decline phase corresponding to these axial stress values ​​is recorded, that is, the duration of violent changes.

[0064] Optionally, the change threshold may be set to 1, 1.2, 1.5, etc. In this embodiment, the change threshold is set to 1.

[0065] S50, based on a preset time factor calculation model, the dynamic destruction time and the change duration are processed to obtain the dynamic time factor of the coal rock sample, and the dynamic time factor of the coal rock sample is proportional to the severity of the ejection of the coal rock sample.

[0066] That is to say, in step S50, the dynamic destruction time and the duration of the violent change are processed as input parameters in combination with the preset time factor calculation model, and the dynamic time factor of the coal rock sample is obtained through complex mathematical calculations. This factor comprehensively considers the speed and intensity of coal rock destruction. The larger its value, the higher the intensity of the ejection of the coal rock sample when it is destroyed.

[0067] In summary, the method for analyzing the severity of coal rock ejection provided in an embodiment of the present invention reflects the severity of coal rock ejection dynamic disasters through a dynamic time factor, and can use quantification and standardization to reflect the severity of coal rock ejection dynamic disasters, thereby improving the accuracy of early warning of dynamic disasters such as impact ground pressure, and taking safety precautions in advance.

[0068] Especially in the mining planning stage, the mining sequence, mining speed and mining method can be reasonably adjusted according to the characteristics of coal and rock ejection in different areas, and targeted tunnel support design can be carried out to reduce the possibility of coal and rock ejection and reduce the destructiveness of coal and rock dynamic disasters.

[0069] In some embodiments, the coal rock sample can be placed on a uniaxial ballast device. The uniaxial ballast device can provide stable and controllable pressure loading conditions. During the implementation of the coal rock ejection severity analysis method, the loading speed and pressure of the uniaxial ballast device can be adjusted to simulate different mining conditions and stress environments, thereby deeply studying the occurrence mechanism of coal rock ejection dynamic disasters.

[0070] Further, in the implementation process of the coal and rock ejection severity analysis method, strain gauges can be first pasted on the surface of the coal and rock sample, and the axial strain values during the pressure loading process are collected through the strain gauges. That is, before step S10, there is also a step of pasting strain gauges on the surface of the coal and rock sample, and the strain gauges are used to collect the axial strain values of the coal and rock sample during the pressure loading process.

[0071] In this embodiment, the step of obtaining the slope corresponding to each axial stress value in the stage where the axial stress decreases with the axial strain according to the axial stress value and its corresponding axial strain value includes:

[0072] Construct a relationship line between the axial stress and the axial strain according to the axial stress value and the axial strain value corresponding to the axial stress value;

[0073] According to the relationship line between the axial stress and the axial strain, determine the stage where the axial stress value of the coal and rock sample decreases with the axial strain value during the pressure loading process, and calculate the slope corresponding to each axial stress value in the decreasing stage.

[0074] Specifically, the relationship line between the axial stress and the axial strain constructed in the step of constructing the relationship line between the axial stress and the axial strain according to the axial stress value and the axial strain value corresponding to the axial stress value is Figure 2 the axial stress and axial strain curve shown in. The relationship line between the axial stress and the axial strain can be divided into a continuously decreasing type after the stress peak, a stepwise decreasing type after the stress peak, and a rapidly decreasing type after the stress peak according to the trend after the peak. Among them, Figure 2 a in is the continuously decreasing type after the stress peak; b is the stepwise decreasing type after the stress peak; c is the rapidly decreasing type after the stress peak.

[0075] Furthermore, in the step of recording the change duration experienced in the continuously decreasing stage corresponding to the plurality of axial stress values if the absolute values of the slopes of a plurality of consecutive axial stress values are greater than or equal to a preset change threshold, the continuously decreasing stage that satisfies the absolute value of the slope being greater than or equal to the preset change threshold is Figure 3 the corresponding stages shown respectively. Among them, are the change durations corresponding to the continuously decreasing stages respectively.

[0076] In some embodiments, the step of obtaining the axial strain value, axial stress value, and time data of the coal and rock sample during the pressure loading process includes:

[0077] Obtain the axial pressure value borne by the coal and rock sample and the cross-sectional area value of the coal and rock sample during the pressure loading process;

[0078] According to the axial pressure value and the cross-sectional area value, the axial stress value borne by the coal and rock sample during the pressure loading process is calculated, and the axial stress value is the ratio of the axial pressure value to the cross-sectional area value.

[0079] Further, the step of obtaining the axial strain value, axial stress value and time data of the coal and rock sample during the pressure loading process further includes an axial stress operation algorithm, and the axial stress operation algorithm includes the following formula:

[0080] ;

[0081] In the formula, is the axial stress value; F is the axial pressure value; A is the cross-sectional area value of the coal and rock sample.

[0082] In this embodiment, the shape of the coal and rock sample can be a cylinder or a cuboid. When the coal and rock sample is a cylinder, then , where r is the cross-sectional radius of the coal and rock sample; is the pi. When the coal and rock sample is a cuboid, then , where b is the side length of the cross-section of the coal and rock sample.

[0083] It should be noted that when selecting coal and rock with impact tendency to make standard coal and rock samples, the height-diameter ratio of the cylinder and the ratio of the height to the cross-section side length of the cuboid are both set to 2:1 to meet the sample requirements of the International Society for Rock Mechanics for uniaxial compression tests. And it is required that the maximum unevenness error of the end face does not exceed 0.02 mm, and the unevenness of the side face does not exceed 0.3 mm.

[0084] In some embodiments, the dynamic failure time is the time experienced by the coal sample from the stress peak to zero in the axial stress value during the pressure loading process. The step of calculating the dynamic failure time of the coal and rock sample according to the axial stress value and the time data includes:

[0085] Obtain the axial stress peak and the peak time corresponding to the axial stress peak according to the axial strain value and time data of the coal and rock sample during the pressure loading process;

[0086] Obtain the critical time when the axial stress value is zero according to the axial strain value and time data of the coal and rock sample during the pressure loading process;

[0087] Calculate the dynamic failure time of the coal and rock sample according to the peak time and the critical time, and the dynamic failure time is the time difference between the peak time and the critical time.

[0088] Specifically, during the confirmation process of the dynamic failure time, first, based on the axial strain values and time data of the coal and rock sample during the pressure loading process, the peak axial stress and its corresponding peak time can be determined. The peak axial stress can mark the ultimate bearing capacity of the internal structure of the coal and rock sample and is also an omen of its impending failure. Then, determine the critical time when the axial stress value drops to zero, which means that the coal and rock sample has completely lost its bearing capacity and its internal structure has undergone significant damage.

[0089] Then, according to the time difference from the peak time to the critical time, the dynamic failure time of the coal and rock sample can be calculated. The dynamic failure time is the time period that the coal and rock sample experiences from when the axial stress reaches the stress peak to complete failure, and it can reflect the failure speed of the coal and rock sample during the pressure loading process. Among them Figure 2 DT represents the stage where the coal and rock sample goes from the axial stress reaching the stress peak to complete failure, and the time period corresponding to this stage is the dynamic failure time.

[0090] During the execution of the method for analyzing the severity of coal and rock ejection provided in an embodiment of the present invention, first, select coal and rock with impact tendency and make standard coal and rock samples; place the coal and rock samples in a uniaxial loading device, and paste strain gauges on the surface of the coal and rock samples. The strain gauges can be connected to external devices to facilitate collecting the axial strain values of the coal and rock samples during the pressure loading process; then, according to the axial pressure value applied to the coal and rock samples by the uniaxial loading device and the cross-sectional area value of the coal and rock samples, calculate the axial stress value of the coal and rock samples during the pressure loading process; then, based on the axial stress value and the axial strain value, construct a relationship line between the axial stress and the axial strain; then, according to the relationship line between the axial stress and the axial strain, determine the stage where the axial stress value of the coal and rock sample decreases with the axial strain value during the pressure loading process, and calculate the slope corresponding to each axial stress value in the decreasing stage; then, determine whether the absolute values of the slopes of consecutive multiple axial stress values are all greater than or equal to a preset change threshold, and record the change duration experienced by the consecutive decreasing stage corresponding to the multiple axial stress values.

[0091] Finally, according to the relationship line between the axial stress and the axial strain and the corresponding time data, determine the dynamic failure time of the coal and rock sample, and then use the time factor operation model to process the dynamic failure time and the transformation duration to obtain the dynamic time factor of the coal and rock sample.

[0092] In addition, in some embodiments, the method for analyzing the severity of coal and rock ejection further includes the steps of:

[0093] Based on the axial stress value of the coal and rock sample and its corresponding axial strain value during the pressure loading process, obtain the stress peak and the elastic modulus of the coal and rock sample;

[0094] Based on the stress peak value, obtain the first continuous decline stage after the stress peak value in multiple continuous decline stages during the pressure loading process of the coal and rock sample, and determine the stress value and strain value at the end point of the first continuous decline stage;

[0095] Calculate the unloading modulus of the coal and rock sample according to the stress value and strain value at the end point of the first continuous decline stage;

[0096] Based on a preset ejection impact model, process the stress value at the end point of the first continuous decline stage, the unloading modulus, the elastic modulus, and the change duration corresponding to the first continuous decline stage to obtain the ejection impact rate of the coal and rock sample within the first continuous decline stage, and the ejection impact rate is proportional to the severity of the coal and rock sample.

[0097] Furthermore, the ejection impact model at least includes an impact rate calculation formula, and the impact rate calculation formula is set as:

[0098] ;

[0099] In the formula: is the ejection impact rate; is the stress value at the starting end point of the first continuous decline stage; is the stress value at the termination end point of the first continuous decline stage; E is the elastic modulus; is the unloading modulus.

[0100] Even further, the step of processing the stress value at the end point of the first continuous decline stage, the unloading modulus, the elastic modulus, and the change duration corresponding to the first continuous decline stage based on a preset ejection impact model to obtain the ejection impact rate of the coal and rock sample within the first continuous decline stage further includes:

[0101] Based on a preset ejection impact model, process the stress value at the end point of the first continuous decline stage, the unloading modulus, and the elastic modulus to obtain the elastic strain energy released by the coal and rock sample in the first continuous decline stage;

[0102] Calculate the ejection impact rate of the coal and rock sample within the first continuous decline stage according to the elastic strain energy and the change duration corresponding to the first continuous decline stage.

[0103] In this application, as Figure 4As shown, for the convenience of describing the specific process of the ejection impact rate of the coal and rock sample in the first continuous descending stage, the two end points of the first continuous descending stage are defined as the stress peak point a and the stage end point b. The axial stress value and axial strain value corresponding to the stress peak point are , and the axial stress value and axial strain value corresponding to the stage end point are .

[0104] Furthermore, the ejection impact model at least includes the formula:

[0105] ;

[0106] .

[0107] In the formula is the ejection impact rate; is the elastic strain energy released by the coal and rock sample in the first continuous descending stage; is the potential energy absorbed by the coal and rock sample in the first continuous descending stage; is the elastic strain energy of the coal and rock sample at the stress peak point; is the elastic strain energy of the coal and rock sample at the stage end point.

[0108] Even further, the potential energy absorbed by the coal and rock sample in the first continuous descending stage ; the elastic strain energy of the coal and rock sample at the stress peak point ; the elastic strain energy corresponding to the coal and rock sample at the stage end point is .

[0109] In this embodiment, in the process of solving the ejection impact rate of the coal and rock sample in the first continuous descending stage, first, according to the axial stress value and axial strain value at the two end points of the first continuous descending stage of the coal and rock sample, calculate the elastic strain energy of the coal and rock sample at the stress peak point, the elastic strain energy U b corresponding to the coal and rock sample at the stage end point, and the potential energy absorbed by the coal and rock sample in the first continuous descending stage. Then, according to the elastic strain energy , the elastic strain energy U b and the potential energy , calculate the elastic strain energy released by the coal and rock sample in the first continuous descending stage; and then, according to the elastic strain energy and the change duration corresponding to the first continuous descending stage, calculate the ejection impact rate of the coal and rock sample in the first continuous descending stage.

[0110] In some embodiments, the method for analyzing the severity of coal and rock ejection further includes the steps of:

[0111] Obtain the dynamic time factors of two coal and rock samples;

[0112] If the dynamic time factor of one of the two coal and rock samples is within the offset range of the dynamic time factor of the other, then perform the step of processing the stress values at the two endpoints of the first continuous descent stage, the unloading modulus, and the elastic modulus based on a preset ejection impact model to obtain the ejection impact rate of the coal and rock sample within the first continuous descent stage, where the offset range is set to be between (1 - a) times the dynamic time factor and (1 + a) times the dynamic time factor, and a is not equal to zero.

[0113] Specifically, during the comparison of the ejection severity of two coal and rock samples, if the dynamic time factor of one of the two coal and rock samples is within the offset range of the dynamic time factor of the other, it indicates that the ejection severity of the two coal and rock samples cannot be accurately compared only based on the dynamic time factor. Then, the step of processing the stress values at the two endpoints of the first continuous descent stage, the unloading modulus, and the elastic modulus based on a preset ejection impact model can be performed to obtain the ejection impact rate of the coal and rock sample within the first continuous descent stage. Furthermore, by comparing the ejection impact rates of the two coal and rock samples within the first continuous stage, the ejection severity of the coal and rock samples can be accurately compared.

[0114] It should be noted that a can be defined as an offset weight parameter, and the offset weight parameter can be set according to requirements. For example, a can be set to values such as 5%, 7%, 8%, 10%, etc.

[0115] In some embodiments, the step of obtaining the stress peak value and the elastic modulus of the coal and rock sample according to the axial stress value and the corresponding axial strain value of the coal and rock sample during the pressure loading process includes:

[0116] According to the axial stress value and the corresponding axial strain value, obtain 4 sets of axial stress values and corresponding axial strain values;

[0117] According to the axial stress value and the corresponding axial strain value, obtain 4 sets of axial stress values and corresponding axial strain values;

[0118] Based on the 4 sets of axial stress values and corresponding axial strain values, calculate the stage elastic modulus between adjacent pairs of the 4 sets of axial stress values and corresponding axial strain values;

[0119] According to the stage elastic modulus, calculate the elastic modulus of the coal and rock sample, and the elastic modulus is the average value of the stage elastic modulus.

[0120] Specifically, based on the axial stress values and the corresponding axial strain values, 4 groups of axial stress values and the corresponding axial strain values can be obtained. The 4 groups of axial stress values and the corresponding axial strain values can be defined as , , , . The stage elastic moduli between adjacent pairs among the 4 groups of axial stress values and the corresponding axial strain values can be set as: , , ; then, based on the stage elastic modulus , the elastic modulus E is calculated, .

[0121] Refer to Figure 5 , which is a schematic structural diagram of a device for analyzing the severity of coal and rock ejection provided by an embodiment of the present invention. The device for analyzing the severity of coal and rock ejection includes an acquisition module 110, a dynamic failure time calculation module 120, a change duration calculation module 130, and a time factor calculation module 140. The above-mentioned modules are electrically connected to each other to realize the transmission and reception of information.

[0122] Among them, the acquisition module 110 is used to acquire the axial strain value, axial stress value, and time data of the coal and rock sample during the pressure loading process, and the axial stress value corresponds to the axial stress value one by one;

[0123] The dynamic failure time calculation module 120 is used to calculate the dynamic failure time of the coal and rock sample according to the axial stress value and the time data;

[0124] The change duration calculation module 130 is used to obtain the slope corresponding to each axial stress value in the stage where the axial stress decreases with the axial strain according to the axial stress value and its corresponding axial strain value; if the absolute values of the slopes of consecutive multiple axial stress values are greater than or equal to a preset change threshold, record the change duration experienced by the consecutive decrease stage corresponding to the multiple axial stress values;

[0125] The time factor calculation module 140 is provided with a time factor calculation model. The time factor calculation module 140 is used to process the dynamic failure time and the change duration according to the time factor calculation model to obtain the dynamic time factor of the coal and rock sample. The dynamic time factor of the coal and rock sample is proportional to the severity of the coal and rock sample ejection.

[0126] It should be noted that the device for analyzing the severity of coal and rock ejection provided in the embodiments of the present application has the same implementation principle and technical effects as those of the foregoing embodiments of the method for analyzing the severity of coal and rock ejection. For the sake of brief description, for the parts not mentioned in the device embodiments, reference may be made to the corresponding content in the foregoing embodiments of the method for analyzing the severity of coal and rock ejection.

[0127] Reference Figure 6 , which is a schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present invention. The electronic device provided in this embodiment includes a processor 210 and a memory 220. The memory 220 stores machine-readable instructions executable by the processor 210. When the machine-readable instructions are executed by the processor 210, the steps in the method for analyzing the severity of coal and rock ejection described in any of the foregoing embodiments are executed. Among them, there is at least one of the processor 210 and the memory 220.

[0128] In this embodiment, the electronic device further includes a communication interface 230 and a communication bus 240. Among them, the processor 210, the memory 220, and the communication interface 230 are connected to each other through the communication bus 240. The communication bus 240 can be divided into an address bus, a data bus, a control bus, etc. For the sake of convenience of representation, Figure 3 only a thick line is used to represent the communication bus 240 in, but it does not mean that there is only one communication bus 240 or one type of communication bus 240. The processor 210 can also be called a controller, and there is no restriction on the name.

[0129] In the embodiments of the present application, the memory 220 stores instructions executable by at least one processor 210. By executing the instructions stored in the memory 220, at least one processor 210 can execute the steps in the method for analyzing the severity of coal and rock ejection discussed above. The processor 210 can implement Figure 3 the functions of each module in the device shown.

[0130] Among them, the processor 210 is the control center of the device. It can connect various parts of the entire control device through various interfaces and lines. By running or executing the instructions stored in the memory 220 and calling the data stored in the memory 220, various functions of the device and process data, so as to monitor the device as a whole.

[0131] In a possible design, the processor 210 may include one or more processing units. The processor 210 may integrate an application processor and a modem processor. Among them, the application processor mainly processes the operating system, the operating body interface, and application programs, etc., and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor may not be integrated into the processor. In some embodiments, the processor 210 and the memory 220 can be implemented on the same chip or separately on independent chips.

[0132] The processor 210 may be a general-purpose processor, such as a central processing unit (CPU), a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method for analyzing the severity of coal and rock ejection disclosed in combination with the embodiments of the present application can be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.

[0133] As a non-volatile computer-readable storage medium, the memory 220 can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The memory 220 may include at least one type of storage medium, for example, it may include flash memory, a hard disk, a multimedia card, a card-type memory, a random access memory (RAM), a static random access memory (SRAM), a programmable read-only memory (PROM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic memory, a magnetic disk, an optical disk, etc. The memory 220 is any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 220 in the embodiments of the present application may also be a circuit or any other device capable of implementing a storage function, for storing program instructions and / or data.

[0134] By designing and programming the processor 210, the code corresponding to the method for analyzing the severity of coal and rock ejection introduced in the foregoing embodiments can be solidified into the chip, so that the chip can execute Figure 2 the steps of the method for analyzing the severity of coal and rock ejection shown in the embodiments. How to design and program the processor 210 is a well-known technology to those skilled in the art and will not be elaborated here.

[0135] In addition, an embodiment of the present application further provides a computer-readable storage medium. Computer-executable instructions are stored in the computer-readable storage medium. When the computer-executable instructions are executed by the processor 210, they are used to implement the coal and rock ejection severity analysis method described in any of the foregoing embodiments. Therefore, details will not be repeated here. In addition, the description of the beneficial effects of the same method will not be repeated either. For the technical details not disclosed in the embodiments of the computer storage medium involved in the present invention, please refer to the description of the method embodiments of the present invention.

[0136] In some possible implementation manners, each aspect of the coal and rock ejection severity analysis method provided by the present application can also be implemented in the form of a program product, which includes program code. When the program product runs on a device, the program code is used to cause the control device to execute the steps in the coal and rock ejection severity analysis method according to various exemplary implementation manners of the present application described above in this specification.

[0137] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0138] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the specified functions in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0139] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device that implements the specified functions in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0140] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus, causing a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, so that the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one process or a plurality of processes and / or blocks Figure 1 one or more processes and / or blocks Figure 1 steps for implementing the functions specified in one block or a plurality of blocks.

[0141] In addition, any process or method description in a flowchart or described otherwise herein may be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a customized logic function or process, and the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be executed in a substantially simultaneous manner or in an order opposite to that shown or discussed, according to the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0142] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that those of ordinary skill in the art may make changes, modifications, substitutions, and variations within the scope of the present invention to the above embodiments.

Claims

1. A method for analyzing the severity of coal-rock ejection, characterized in that: The steps include: Acquire the axial strain value, axial stress value and time data of the coal rock sample during the pressure loading process, wherein the axial strain value corresponds to the axial stress value one by one; Calculating the dynamic failure time of the coal rock sample according to the axial stress value and the time data; According to the axial stress value and the corresponding axial strain value, a slope corresponding to each axial stress value in the stage where the axial stress decreases with the axial strain is obtained; If the absolute values ​​of the slopes of the consecutive multiple axial stress values ​​are all greater than or equal to the preset change threshold, then the change durations of the consecutive decreasing stages corresponding to the consecutive multiple axial stress values ​​are recorded; Based on a preset time factor calculation model, the dynamic destruction time and the change duration are processed to obtain a dynamic time factor of the coal rock sample, and the dynamic time factor of the coal rock sample is proportional to the severity of the ejection of the coal rock sample; The time factor calculation model at least includes a dynamic time factor algorithm, and the dynamic time factor algorithm includes that the dynamic time factor is the ratio of the sum of all change durations of the axial stress of the coal rock sample in the stage of decreasing the axial strain to the dynamic failure time.

2. The coal-rock ejection severity analysis method according to claim 1 is characterized in that: The step of obtaining the axial strain value, axial stress value and time data of the coal rock sample during the pressure loading process comprises: Obtain the axial pressure value borne by the coal-rock sample during the pressure loading process and the cross-sectional area value of the coal-rock sample; According to the axial pressure value and the cross-sectional area value, the axial stress value borne by the coal rock sample during the pressure loading process is calculated, and the axial stress value is the ratio of the axial pressure value to the cross-sectional area value; And / or, the step of calculating the dynamic failure time of the coal rock sample according to the axial stress value and the time data comprises: According to the axial strain value and time data of the coal rock sample during the pressure loading process, the axial stress peak value and the peak time corresponding to the axial stress peak value are obtained; According to the axial strain value and time data of coal rock samples during pressure loading, the critical time when the axial stress value is zero is obtained; The dynamic failure time of the coal rock sample is calculated based on the peak time and the critical time, and the dynamic failure time is the time difference between the peak time and the critical time.

3. The method for analyzing the severity of coal-rock ejection according to claim 1, characterized in that: The coal-rock ejection severity analysis method further comprises the steps of: According to the axial stress value and the corresponding axial strain value of the coal-rock sample during the pressure loading process, the stress peak value and the elastic modulus of the coal-rock sample are obtained; According to the stress peak value, a first continuous descending stage located after the stress peak value in a plurality of continuous descending stages of the coal rock sample during the pressure loading process is obtained, and a stress value and a strain value at an end point of the first continuous descending stage are determined; The unloading modulus of the coal rock sample is calculated according to the stress value and the strain value at the end point of the first continuous descending stage; Based on the preset ejection impact model, the stress value at the endpoint of the first continuous descent stage, the unloading modulus, the elastic modulus and the change time corresponding to the first continuous descent stage are processed to obtain the ejection impact rate of the coal rock sample in the first continuous descent stage. The ejection impact rate is proportional to the intensity of the coal rock sample.

4. The coal-rock ejection severity analysis method according to claim 3 is characterized in that: The ejection impact model at least includes an impact rate calculation formula, and the impact rate calculation formula is set to: ； Where: is the ejection impact velocity; is the stress value at the starting endpoint of the first continuous descending stage; is the stress value at the end point of the first continuous descending stage; E is the elastic modulus; is the unloading modulus.

5. The method for analyzing the severity of coal-rock ejection according to claim 3, characterized in that: The step of obtaining the stress peak value and the elastic modulus of the coal rock sample according to the axial stress value and the corresponding axial strain value of the coal rock sample during the pressure loading process includes: According to the axial stress value and the corresponding axial strain value, four groups of axial stress values ​​and corresponding axial strain values ​​are obtained; Based on the four groups of axial stress values ​​and the corresponding axial strain values, the stage elastic modulus between the adjacent two of the four groups of axial stress values ​​and the corresponding axial strain values ​​is calculated; The elastic modulus of the coal rock sample is calculated based on the elastic modulus of the stage, and the elastic modulus is the average value of the elastic modulus of the stage.

6. The method for analyzing the severity of coal-rock ejection according to claim 3, characterized in that: Also includes the steps: Obtain the dynamic time factor of two coal and rock samples; If the dynamic time factor of one of the two coal and rock samples is within the offset range of the dynamic time factor of the other, a step is performed based on a preset ejection impact model to process the stress values ​​at the two endpoints of the first continuous descent stage, the unloading modulus and the elastic modulus to obtain the ejection impact rate of the coal and rock sample in the first continuous descent stage, wherein the offset range is set between (1-a) times the dynamic time factor and (1+a) times the dynamic time factor, where a is not equal to zero.

7. The method for analyzing the severity of coal-rock ejection according to claim 1, characterized in that: The step of obtaining the slope corresponding to each axial stress value in the stage where the axial stress decreases with the axial strain according to the axial stress value and the axial strain value corresponding thereto comprises: Constructing a relationship line between axial stress and axial strain according to the axial stress value and the axial strain value corresponding to the axial stress value; According to the relationship line between axial stress and axial strain, the stage in which the axial stress value of the coal rock sample decreases along with the axial strain value during the pressure loading process is determined, and the slope corresponding to each axial stress value in the decreasing stage is calculated.

8. A device for analyzing the severity of coal-rock ejection, characterized in that: include: An acquisition module, the acquisition module is used to acquire the axial strain value, axial stress value and time data of the coal rock sample during the pressure loading process, the axial strain value and the axial stress value corresponding one to one; A dynamic failure time calculation module, which is used to calculate the dynamic failure time of the coal rock sample according to the axial stress value and the time data; A change time calculation module, wherein the change time calculation module is used to obtain the slope corresponding to each axial stress value in the stage where the axial stress decreases with the axial strain according to the axial stress value and the axial strain value corresponding thereto; if the absolute values ​​of the slopes of multiple consecutive axial stress values ​​are greater than or equal to a preset change threshold, then the change time experienced by the continuous decrease stage corresponding to the multiple axial stress values ​​is recorded; A time factor calculation module is provided with a time factor calculation model, and the time factor calculation module is used to process the dynamic destruction time and the change duration according to the time factor calculation model to obtain the dynamic time factor of the coal rock sample, and the dynamic time factor of the coal rock sample is proportional to the intensity of the ejection of the coal rock sample.

9. An electronic device, characterized in that: It comprises a processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the machine-readable instructions are executed by the processor, the steps in the method for analyzing the severity of coal and rock ejection provided in any one of claims 1-7 are executed.

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