Method and device for evaluating coal impact tendency based on acoustic emission energy

Abstract

The invention relates to the technical field of mine coal rock dynamic disaster prevention and control, in particular to a coal impact tendency evaluation method based on acoustic emission energy. The method comprises the following steps: under the condition that a first coal sample is loaded with a preset acting force, acquiring an elastic energy index of the first coal sample based on acoustic emission characteristics and stress-strain characteristics; acquiring an impact energy index of the first coal sample according to the stress-strain characteristics; according to a relation curve of stress and time of the coal sample, acquiring uniaxial compressive strength and damage duration of the first coal sample; and performing impact tendency evaluation on the first coal sample according to the elastic energy index, the impact energy index, the uniaxial compressive strength and the damage duration by adopting an impact tendency evaluation mode to obtain the impact tendency of the first coal sample. By adopting the method and the device, the accuracy and the convenience of coal sample impact tendency evaluation can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of coal and rock dynamic disaster prevention in mines, and particularly relates to a coal impact tendency evaluation method based on acoustic emission energy. BACKGROUND

[0002] The increasing mining depth and mining intensity of mines make the problem of coal bumping pressure increasingly serious, which hinders the safe and efficient mining of mines and threatens the life and property safety of underground miners. As the basis of bumping pressure prevention, before the construction of mines, the mining of new coal seams and the mining of new mining areas, sufficient impact tendency testing and evaluation need to be carried out. However, the impact tendency testing and evaluation need to be carried out through repeated loading and unloading tests, which makes the impact tendency evaluation procedure cumbersome and the evaluation accuracy and convenience poor. SUMMARY

[0003] The present disclosure provides a coal impact tendency evaluation method based on acoustic emission energy, which can improve the accuracy and convenience of coal sample impact tendency evaluation. The technical solution of the present disclosure is as follows:

[0004] According to a first aspect of the embodiments of the present disclosure, a coal impact tendency evaluation method based on acoustic emission energy is provided, which comprises:

[0005] Under the condition that the first coal sample is under a preset force, the elastic energy index of the first coal sample is obtained based on the acoustic emission characteristics and the stress-strain characteristics;

[0006] According to the stress-strain characteristics, the impact energy index of the first coal sample is obtained;

[0007] According to the stress-time relationship curve of the coal sample, the uniaxial compressive strength and the failure duration of the first coal sample are obtained;

[0008] According to the impact tendency evaluation method, the impact tendency of the first coal sample is evaluated according to the elastic energy index, the impact energy index, the uniaxial compressive strength and the failure duration.

[0009] According to some embodiments, under the condition that the first coal sample is under a preset force, the elastic energy index of the first coal sample is obtained based on the acoustic emission cumulative energy and the stress-strain characteristics, which comprises:

[0010] Under the condition that the first coal sample is under a preset force, the first input energy is obtained according to the stress-strain characteristics and the pre-peak data of the first coal sample;

[0011] According to the quantitative relationship between the acoustic emission cumulative energy corresponding to the pre-peak stage and the acoustic emission cumulative energy and the dissipated energy, the first dissipated energy of the first coal sample during the process of being under the preset force is obtained.

[0012] According to the first input energy and the first dissipation energy, a first elastic energy of the first coal sample in the process of loading the preset force is obtained.

[0013] According to the first elastic energy and the first dissipation energy, an elastic energy index of the first coal sample is obtained.

[0014] According to some embodiments, the method further comprises:

[0015] In a case that at least one second coal sample is under a uniaxial loading and unloading force condition, a quantitative relationship between acoustic emission cumulative energy and dissipation energy is obtained.

[0016] According to some embodiments, the obtaining, in a case that at least one second coal sample is under a uniaxial loading and unloading force condition, a quantitative relationship between acoustic emission cumulative energy and dissipation energy comprises:

[0017] In a case that at least one second coal sample is under a uniaxial loading and unloading force condition, according to a second input energy, an axial stress set and a strain set corresponding to any second coal sample are obtained.

[0018] According to the axial stress set, the strain set and an unloading stress-strain curve of the any second coal sample, a second elastic energy corresponding to the any second coal sample is obtained.

[0019] A third input energy corresponding to the any second coal sample under a uniaxial loading force condition is obtained.

[0020] According to the third input energy and the second elastic energy, a second dissipation energy of the any second coal sample under the uniaxial loading force condition is obtained.

[0021] According to the third input energy and the second dissipation energy, a quantitative relationship between acoustic emission cumulative energy and dissipation energy is obtained.

[0022] According to some embodiments, the obtaining, according to the stress-strain characteristic, an impact energy index of the first coal sample comprises:

[0023] According to the stress-strain characteristic, an elastic modulus of the first coal sample in the process of loading the preset force is obtained, wherein the elastic modulus is used to indicate a modulus value of the first input energy of the first coal sample in the process of loading the preset force.

[0024] A softening modulus corresponding to the first coal sample is obtained, wherein the softening modulus is used to indicate a modulus value of the first dissipation energy of the first coal sample in the process of loading the preset force.

[0025] a ratio of the elastic modulus and the softening modulus as an impact energy index of the first coal sample.

[0026] According to some embodiments, the method further comprises:

[0027] obtaining environmental information corresponding to the first coal sample;

[0028] correcting the impact tendency of the first coal sample by using the environmental information, to obtain a corrected impact tendency.

[0029] According to some embodiments, the method further comprises:

[0030] obtaining coal sample information corresponding to the first coal sample;

[0031] obtaining loading information corresponding to the first coal sample according to the coal sample information, wherein the loading information includes a force loading mode and the preset force.

[0032] According to a second aspect of the embodiments of the present disclosure, an evaluation device for coal impact tendency based on acoustic emission energy is provided, comprising:

[0033] an index obtaining unit, configured to obtain an elastic energy index of the first coal sample based on acoustic emission characteristics and stress-strain characteristics when the first coal sample is under a preset force loading;

[0034] The index obtaining unit is further configured to obtain an impact energy index of the first coal sample according to the stress-strain characteristics.

[0035] a data obtaining unit, configured to obtain uniaxial compressive strength and failure duration of the first coal sample according to a stress-time relationship curve of the coal sample.

[0036] a tendency evaluation unit, configured to evaluate the impact tendency of the first coal sample by using an impact tendency evaluation mode according to the elastic energy index, the impact energy index, the uniaxial compressive strength and the failure duration, to obtain the impact tendency of the first coal sample.

[0037] According to a third aspect of the embodiments of the present disclosure, an electronic device is provided, comprising:

[0038] a processor;

[0039] a memory for storing instructions executable by the processor;

[0040] The processor is configured to execute the instructions to implement the evaluation method for coal impact tendency based on acoustic emission energy according to any one of the preceding aspects.

[0041] According to a fourth aspect of the embodiments of the present disclosure, a storage medium is provided, which, when instructions in the storage medium are executed by a processor of an electronic device, enables the electronic device to perform the method for evaluating the coal impact tendency based on acoustic emission energy according to any one of the preceding aspects.

[0042] According to a fifth aspect of the embodiments of the present disclosure, a computer program product is provided, which comprises a computer program, which, when executed by a processor, implements the method according to any one of the preceding aspects.

[0043] The technical solutions provided by the embodiments of the present disclosure at least bring the following beneficial effects:

[0044] In some or related embodiments, by acquiring the elastic energy index of the first coal sample based on the acoustic emission characteristics and the stress-strain characteristics when the first coal sample is under a preset load force, the impact energy index of the first coal sample is acquired according to the stress-strain characteristics, the uniaxial compressive strength and the failure duration of the first coal sample are acquired according to the stress-time curve of the coal sample, and the impact tendency of the first coal sample is evaluated according to the elastic energy index, the impact energy index, the uniaxial compressive strength and the failure duration by using the impact tendency evaluation method. Therefore, the characteristic information can be acquired in advance, the evaluation parameters can be acquired, the impact tendency can be directly evaluated according to the corresponding evaluation parameters, the failure rate of repeated loading and unloading tests can be reduced, the cumbersome steps of the loading and unloading tests can be reduced, the efficiency of the impact tendency evaluation of the coal sample can be improved, the impact tendency evaluation according to the test results by manual operation can be reduced, the subjectivity and contingency of the impact tendency evaluation can be reduced, and the accuracy and convenience of the impact tendency evaluation of the coal sample can be improved.

[0045] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0046] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, serve to explain the principles of the present disclosure, and do not constitute an improper limitation on the present disclosure.

[0047] Figure 1 is a flowchart of a first method for evaluating the coal impact tendency based on acoustic emission energy provided by the embodiments of the present disclosure;

[0048] Figure 2 is a flowchart of a second method for evaluating the coal impact tendency based on acoustic emission energy provided by the embodiments of the present disclosure;

[0049] Figure 3 is a flowchart of a third coal impact tendency evaluation method based on acoustic emission energy provided by an embodiment of the present disclosure.

[0050] Figure 4 is an example schematic diagram of strain and stress provided by an embodiment of the present disclosure.

[0051] Figure 5 is an example schematic diagram of dissipated energy density and acoustic emission cumulative energy provided by an embodiment of the present disclosure.

[0052] Figure 6 is an example schematic diagram of elastic energy provided by an embodiment of the present disclosure.

[0053] Figure 7 is a block diagram of a deep coal rock mass instability dynamic multi-parameter evaluation device for microseismic according to an example embodiment.

[0054] Figure 8 is an example schematic diagram of an electronic device according to an example embodiment. DETAILED DESCRIPTION

[0055] In order for ordinary people in the art to better understand the technical solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings.

[0056] The embodiments of the present disclosure propose a coal impact tendency evaluation method, device, electronic device and storage medium based on acoustic emission energy. In some embodiments, the coal impact tendency evaluation method based on acoustic emission energy and the information processing method, communication method and other terms can be mutually replaced, the coal impact tendency evaluation device based on acoustic emission energy and the information processing device, communication device and other terms can be mutually replaced, and the information processing system, communication system and other terms can be mutually replaced.

[0057] The embodiments of the present disclosure are not exhaustive, but only illustrate some embodiments, and are not specific limitations on the protection scope of the present disclosure. In the case of no contradiction, each step in an embodiment can be implemented as an independent embodiment, and the steps can be combined arbitrarily, for example, the scheme after removing some steps in an embodiment can also be implemented as an independent embodiment, and the order of the steps in an embodiment can be exchanged arbitrarily, in addition, the optional implementation manners in an embodiment can be combined arbitrarily; in addition, the embodiments can be combined arbitrarily, for example, the steps of different embodiments or all steps of different embodiments can be combined arbitrarily, an embodiment can be combined with the optional implementation manners of other embodiments arbitrarily.

[0058] In the embodiments of the present disclosure, the terms and / or descriptions among the embodiments are consistent and can be mutually referred to if there is no special description and logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0059] The terms used in the embodiments of the present disclosure are only for the purpose of describing the specific embodiments and not as a limitation of the present disclosure.

[0060] In the embodiments of the present disclosure, unless otherwise specified, the elements expressed in singular form, such as "one", "a", "the", "above", "said", "preceding", "this", etc., can represent "one and only one", or can represent "one or more", "at least one", etc. For example, in the case of using articles such as "a", "an", "the" in English, the noun after the article can be understood as singular expression, or can be understood as plural expression.

[0061] In the embodiments of the present disclosure, "plurality" refers to two or more.

[0062] In some embodiments, the terms "at least one of", "one or more", "a plurality of", "multiple", and the like can be replaced with each other.

[0063] The prefix words "first", "second" and the like in the embodiments of the present disclosure are only used to distinguish different description objects, and do not constitute limitation on the position, order, priority, quantity or content of the description objects. The description of the description objects should refer to the description in the context of the claims or embodiments, and should not constitute redundant limitation because of the use of the prefix words. For example, the description object is "field", and the ordinal words before "field" in "first field" and "second field" do not limit the position or order between "fields", and "first" and "second" do not limit whether the "fields" modified thereby are in the same message or not, nor limit the order of "first field" and "second field". For another example, the description object is "level", and the ordinal words before "level" in "first level" and "second level" do not limit the priority between "levels". For another example, the quantity of the description object is not limited by the ordinal words, and can be one or more. For example, "first device", wherein the quantity of "device" can be one or more. In addition, the objects modified by different prefix words can be the same or different, for example, the description object is "device", and "first device" and "second device" can be the same device or different devices, and the types thereof can be the same or different; for another example, the description object is "information", and "first information" and "second information" can be the same information or different information, and the content thereof can be the same or different.

[0064] In some embodiments, a "terminal" or "terminal device" can be referred to as a "user equipment" (UE), a "user terminal," a "mobile station" (MS), a "mobile terminal" (MT), a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, etc.

[0065] In some embodiments, data, information, etc. can be acquired after consent from a user is obtained.

[0066] It should be noted that the terms "first", "second", and the like, herein do not necessarily have an ordinal, sequential, or chronologic implication, but are used to differentiate one element from another. It is to be understood that the terms so used in the description and the claims are interchangeable under appropriate circumstances. The implementations described herein are not meant to be an exhaustive list of all implementations which can be made in accordance with the disclosure. Rather, the implementations are merely illustrative and are not meant to limit the scope of the disclosure to these implementations. Rather, the scope of the disclosure is to be understood as not limited to the implementations described herein but rather parameterized by the claims below and their equivalents.

[0067] According to some embodiments, the impact tendency evaluation process may, for example, test indicators such as uniaxial compressive strength, dynamic failure time, elastic energy index, impact energy index, and the like, and requires complex testing on a large number of test samples. Although some embodiments provide simple test methods for impact tendency, such as simplified softening modulus-elastic modulus ratio, yield degree, brittleness index, and the like, such test methods are generally too simple, reducing the reliability of the evaluation results. The evaluation of impact tendency mainly focuses on the energy accumulation degree of the coal sample and its release rate. During the loading process, the coal sample accumulates energy while also dissipating part of the energy, the fracture development increases the dissipated energy, and the instability failure releases energy rapidly outward. Energy accumulation is mainly caused by elastic deformation in the pre-peak stage, but coal and rock are a kind of elastic-plastic material, and the plastic deformation energy is also dissipated outward while the energy is accumulated. The elastic energy index is the ratio of the accumulated elastic energy to the dissipated plastic energy in the pre-peak stage. Therefore, the technical solutions of some embodiments must be tested by repeated loading and unloading tests to obtain the ratio of the elastic energy to the plastic energy when the peak loading is about 80% of the peak strength. However, this method requires more accurate prediction of the peak strength, has a lower test failure rate, requires a large number of repeated tests, and the results obtained are accidental and subjective.

[0068] Figure 1 is a flowchart of a first evaluation method for coal impact tendency based on acoustic emission energy provided by the embodiments of the present disclosure, as shown in Figure 1 The evaluation method for coal impact tendency based on acoustic emission energy may be used in the scenario of coal impact tendency, and includes the following steps:

[0069] In step S11, the elastic energy index of the first coal sample is obtained based on the acoustic emission characteristics and the stress-strain characteristics when the first coal sample is under a preset force.

[0070] In some embodiments, the execution subject of the embodiments of the present disclosure may, for example, be an electronic device. The electronic device is not particularly limited to a fixed electronic device. For example, the electronic device may also change accordingly when the device identifier changes. For example, the electronic device may also change accordingly when the structure of the electronic device changes. The execution subject of the embodiments of the present disclosure may, for example, also be a server, which may, for example, be a single server or a server cluster, and the embodiments of the present disclosure do not limit the same.

[0071] In some embodiments, the first coal sample may, for example, be a coal sample to be evaluated for impact tendency. The first coal sample is not particularly limited to a fixed coal sample. For example, the first coal sample may also change accordingly when the shape of the first coal sample changes. For example, the first coal sample may also change accordingly when the composition of the first coal sample changes. For example, the first coal sample may also change accordingly when the coal sample identifier of the first coal sample changes.

[0072] According to some embodiments, the preset force may, for example, be used to indicate the pressure acting on the first coal sample. The preset force does not refer to a fixed force. For example, when the value of the preset force changes, the preset force may also change accordingly. For example, when the direction of the preset force changes, the preset force may also change accordingly.

[0073] According to some embodiments, the acoustic emission feature may, for example, be the corresponding feature generated by the first coal sample when the energy is rapidly released. The acoustic emission feature does not refer to a fixed feature. For example, when the specific feature included in the acoustic emission feature changes, the acoustic emission feature may also change accordingly.

[0074] In some embodiments, the stress and strain may, for example, be the general term of stress and strain. The stress may, for example, be "additional internal force per unit area". When an object is subjected to force and deformed, the deformation degree at each point in the object is generally not the same. The mechanical quantity used to describe the deformation degree at a point is the strain of the point.

[0075] According to some embodiments, the stress and strain feature may, for example, be a feature related to the first coal sample. The stress feature may, for example, be the additional internal force per unit area of the first coal sample.

[0076] According to some embodiments, the weighted elastic energy (WET) may, for example, be a key indicator for evaluating the impact tendency of the coal sample. For example, it may be the ratio of the elastic energy stored and the dissipated energy of the first coal sample during loading. The weighted elastic energy does not refer to a fixed index. For example, when the elastic energy or the dissipated energy changes, the weighted elastic energy may also change accordingly.

[0077] In some embodiments, the elastic energy index of the first coal sample is obtained based on the acoustic emission feature and the stress and strain feature when the first coal sample is subjected to the preset force.

[0078] In step S12, the impact energy index of the first coal sample is obtained according to the stress and strain feature;

[0079] According to some embodiments, the impact energy index may, for example, be a ratio of a modulus of the elastic energy and a modulus of the dissipated energy. The impact energy index does not refer to a fixed index. For example, when the strain-stress characteristic changes, the impact energy index may also change accordingly. For example, when the modulus of the elastic energy or the modulus of the dissipated energy obtained changes, the impact energy index may also change accordingly.

[0080] In some embodiments, the impact energy index of the first coal sample may be obtained according to the stress-strain characteristic.

[0081] In step S13, the uniaxial compressive strength and the failure duration of the first coal sample may be obtained according to the stress-time curve of the coal sample.

[0082] In some embodiments, the stress-time curve may, for example, be a curve obtained in advance for indicating the relationship between stress and time.

[0083] In some embodiments, the uniaxial compressive strength may, for example, be used to indicate the ability of the first coal sample to withstand a certain pressure or a certain acting force.

[0084] According to some embodiments, the failure duration may, for example, be a duration from when the first coal sample starts to be loaded with a preset acting force to when the first coal sample fails. The failure duration does not refer to a fixed duration. For example, when the preset acting force changes, the failure duration may also change accordingly.

[0085] In some embodiments, the uniaxial compressive strength and the failure duration of the first coal sample may be obtained according to the stress-time curve of the coal sample. Alternatively, the uniaxial compressive strength and the failure duration of the first coal sample may be obtained according to the stress-time curve of the coal sample.

[0086] In some embodiments, the uniaxial compressive strength and the failure duration of the first coal sample may be obtained according to the stress-time curve of the coal sample.

[0087] In step S14, the impact tendency of the first coal sample may be evaluated by using an impact tendency evaluation method according to the elastic energy index, the impact energy index, the uniaxial compressive strength and the failure duration, and the impact tendency of the first coal sample may be obtained.

[0088] According to some embodiments, the impact tendency evaluation mode may, for example, be an evaluation mode corresponding to the first coal sample. The impact tendency evaluation mode may, for example, change according to changes in the scenario information or change according to changes in the coal sample information of the first coal sample. The impact tendency evaluation mode is not specific to a fixed mode. For example, when the weight information corresponding to the impact tendency evaluation mode changes, the impact tendency evaluation mode may also change accordingly. For example, when the determination mode of the impact tendency evaluation mode changes, the impact tendency evaluation mode may also change accordingly.

[0089] According to some embodiments, the impact tendency may, for example, refer to a natural attribute of whether the coal rock mass can have a rock burst, and in embodiments of the present disclosure, the impact tendency may, for example, be an attribute of whether the first coal sample can have a rock burst. The impact tendency of the first coal sample is not specific to a fixed attribute. For example, when any one of the elastic energy index, the impact energy index, the uniaxial compressive strength, and the failure duration changes, the impact tendency of the first coal sample may also change accordingly.

[0090] In some embodiments, the impact tendency of the first coal sample is evaluated according to the elastic energy index, the impact energy index, the uniaxial compressive strength, and the failure duration by using the impact tendency evaluation mode.

[0091] In some or related embodiments, the elastic energy index of the first coal sample is obtained based on the acoustic emission characteristics and the stress-strain characteristics by loading the first coal sample with a preset force; the impact energy index of the first coal sample is obtained according to the stress-strain characteristics; the uniaxial compressive strength and the failure duration of the first coal sample are obtained according to the stress-time curve of the coal sample; and the impact tendency of the first coal sample is evaluated according to the elastic energy index, the impact energy index, the uniaxial compressive strength, and the failure duration by using the impact tendency evaluation mode. Therefore, the characteristic information can be obtained in advance, the evaluation parameters can be obtained, the impact tendency can be directly evaluated according to the corresponding evaluation parameters, the failure rate of the loading and unloading test can be reduced, the repeated test can be reduced, the cumbersome steps of the loading and unloading test can be reduced, the efficiency of the impact tendency evaluation of the coal sample can be improved, the determination of the impact tendency evaluation by the artificial according to the test results can be reduced, the subjectivity and contingency of the impact tendency evaluation can be reduced, the accuracy and convenience of the impact tendency evaluation of the coal sample can be improved.

[0092] Figure 2 is a flowchart of a second coal impact tendency evaluation method based on acoustic emission energy provided by the embodiments of the present disclosure, as shown in Figure 2As shown, the coal impact tendency evaluation method based on acoustic emission energy can be used in an evaluation scenario of coal impact tendency, and includes the following steps:

[0093] In step S21, under the condition that the first coal sample is subjected to a preset force, the first input energy is obtained according to the stress-strain characteristic and the pre-peak data of the first coal sample.

[0094] Details are as described above, and will not be repeated here.

[0095] In some embodiments, the stress-strain characteristic may, for example, be a characteristic obtained under the condition that the first coal sample is subjected to a preset force. The stress-strain characteristic may, for example, be a stress-strain curve. The pre-peak data may, for example, be data obtained before the peak value of the stress-strain curve. The pre-peak data is not limited to a fixed data. For example, when the coal sample or the preset force changes, the pre-peak data can also change accordingly.

[0096] In some embodiments, the first input energy may, for example, be energy input to the first coal sample during the process of loading the preset force. The first input energy is not limited to a fixed energy. For example, when the manner of obtaining the first input energy changes, the first input energy can also change accordingly. The first input energy is distinguished from the rest of the input energy, and is not limited to a fixed energy.

[0097] In some embodiments, the first input energy may, for example, be obtained according to the stress-strain characteristic and the pre-peak data of the first coal sample under the condition that the first coal sample is subjected to a preset force.

[0098] According to some embodiments, the method further includes:

[0099] Obtaining coal sample information corresponding to the first coal sample;

[0100] According to the coal sample information, obtaining loading information corresponding to the first coal sample, wherein the loading information includes a force loading manner and a preset force. Therefore, the loading information corresponding to the first coal sample can be obtained, the matching of the loading information and the coal sample is improved, and the accuracy of the impact tendency determination is improved.

[0101] In some embodiments, the coal sample information may, for example, be information related to the first coal sample. The coal sample information may, for example, include coal sample size, coal sample material, coal sample density, and coal sample shape, etc. For example, the first coal sample may, for example, be processed in advance to obtain a first coal sample with a preset shape. The preset shape may, for example, be a cylindrical shape. The present disclosure is not limited in this regard.

[0102] In some embodiments, Figure 3is a flowchart of a third coal impact tendency evaluation method based on acoustic emission energy provided by the embodiments of the present disclosure, as shown in Figure 3 As shown in the formula (1), the coal sample can be collected and processed into a standard cylindrical coal sample based on the rock mechanics test method and procedure, for example.

[0103] In step S22, according to the quantitative relationship between the acoustic emission cumulative energy corresponding to the pre-peak stage and the acoustic emission cumulative energy and the dissipated energy, the first dissipated energy of the first coal sample in the process of loading the preset acting force is obtained.

[0104] For example, the related description can be as described above, which will not be repeated here.

[0105] In some embodiments, the acoustic emission cumulative energy corresponding to the pre-peak stage can be calculated by detecting the stress-strain curve of the first coal sample. When the acoustic emission cumulative energy corresponding to the pre-peak stage is obtained, the first dissipated energy of the first coal sample in the process of loading the preset acting force can be obtained according to the quantitative relationship between the acoustic emission cumulative energy corresponding to the pre-peak stage and the acoustic emission cumulative energy and the dissipated energy. For example, the first dissipated energy of the first coal sample in the process of loading the preset acting force can be obtained according to the quantitative relationship between the acoustic emission cumulative energy corresponding to the pre-peak stage and the dissipated energy.

[0106] For example, when the acoustic emission cumulative energy corresponding to the pre-peak stage changes, the first dissipated energy can also change accordingly. For example, when the quantitative relationship changes, the first dissipated energy can also change accordingly. The first dissipated energy in the first dissipated energy is used to distinguish from the rest of the dissipated energy.

[0107] In step S23, according to the first input energy and the first dissipated energy, the first elastic energy of the first coal sample in the process of loading the preset acting force is obtained.

[0108] For example, the related description can be as described above, which will not be repeated here.

[0109] In some embodiments, when the first input energy and the first dissipated energy are obtained, the first elastic energy of the first coal sample in the process of loading the preset acting force can be obtained according to the first input energy and the first dissipated energy. For example, the difference between the first input energy and the first dissipated energy can be taken as the first elastic energy of the first coal sample in the process of loading the preset acting force.

[0110] According to some embodiments, the first elastic energy may, for example, be used to indicate the elastic energy accumulated by the first coal sample in the process of loading the preset force. The elastic energy may, for example, also be referred to as elastic energy. The first in the first elastic energy is used to distinguish from the rest of the elastic energy.

[0111] According to some embodiments, as shown in Figure 3 The dissipation energy and the acoustic emission cumulative energy of the coal sample in the loading and unloading process may, for example, be obtained through the loading and unloading test of monitoring the acoustic emission of a plurality of coal samples, and a quantitative display mathematical model of the dissipation energy and the acoustic emission cumulative energy, i.e., a quantitative relationship, is fitted.

[0112] According to some embodiments, the method further comprises:

[0113] In the case that at least one second coal sample is under the uniaxial loading and unloading force condition, the quantitative relationship between the acoustic emission cumulative energy and the dissipation energy is obtained. Therefore, the quantitative relationship can be obtained through the data of the uniaxial loading and unloading force condition, which can improve the accuracy of obtaining the quantitative relationship, improve the accuracy of obtaining the elastic energy in the process of loading the force, and improve the accuracy of obtaining the impact tendency.

[0114] According to some embodiments, the second coal sample may, for example, be a historical coal sample, i.e., a coal sample used to obtain the quantitative relationship between the acoustic emission cumulative energy and the dissipation energy. The number of the second coal sample may, for example, be a plurality. The at least one second coal sample may, for example, be subjected to a cyclic loading and unloading force operation.

[0115] According to some embodiments, in the case that at least one second coal sample is under the uniaxial loading and unloading force condition, the quantitative relationship between the acoustic emission cumulative energy and the dissipation energy is obtained, comprising:

[0116] In the case that at least one second coal sample is under the uniaxial loading and unloading force condition, the axial stress set and the strain set corresponding to any second coal sample are obtained according to the second input energy;

[0117] According to the axial stress set and the strain set corresponding to any second coal sample and the unloading stress-strain curve of any second coal sample, the second elastic energy corresponding to any second coal sample is obtained;

[0118] The third input energy corresponding to any second coal sample under the uniaxial loading force condition is obtained;

[0119] According to the third input energy and the second elastic energy, the second dissipation energy of any second coal sample under the uniaxial loading force condition is obtained;

[0120] According to the third input energy and the second dissipation energy, the quantitative relationship between the acoustic emission cumulative energy and the dissipation energy is obtained.

[0121] In some embodiments, the set of axial stresses may, for example, include stresses corresponding to a plurality of cyclic operations. The set of axial stresses may, for example, be a collective of at least one axial stress. The set of axial stresses does not refer to a fixed set. For example, when a certain axial stress in the set of axial stresses changes, the set of axial stresses may also change accordingly. An example schematic diagram of strain and stress may, for example, be as shown in FIG. 8. Figure 4 The elastic energy may, for example, also be referred to as elastic accumulation energy, and the dissipation energy may, for example, also be referred to as plastic dissipation energy.

[0122] According to some embodiments, the second input energy may, for example, be energy input in the process of loading and unloading of the second coal sample. The second input energy is distinguished from the rest of the input energy.

[0123] In some embodiments, the strain may, for example, correspond to stress. The set of strains may, for example, be a collective of at least one strain. The set of strains does not refer to a fixed set. For example, when the amount of data corresponding to the set of strains changes, the set of strains may also change accordingly. For example, when a certain strain in the set of strains changes, the set of strains may also change accordingly.

[0124] In some embodiments, the third input energy may, for example, be energy input in the process of loading of the second coal sample.

[0125] In some embodiments, the damage evolution of coal and rock is accompanied by the accumulation and dissipation of energy. Under cyclic loading and unloading, the coal sample undergoes four stages of initial compaction, stable deformation, damage deterioration, and failure instability, and the input of external energy and the accumulation, dissipation, and release of coal sample energy throughout the entire process. The input energy, elastic energy, dissipation energy, and thermal energy of the loaded coal and rock are mutually transformed, and the calculation of input energy, elastic energy, and irreversible dissipation energy is crucial for evaluating the impact tendency.

[0126] Embodiments of the present disclosure may, for example, be carried out in a pre-set closed system, which may, for example, also be referred to as a loading and unloading test system. The total energy U input by the external environment to the coal sample is generated by the work of the axial stress. Under the i-th cycle of loading, the input energy of loading will be divided into two parts, one part causes the elastic deformation of coal and rock to become elastic energy, and the other part causes the plastic deformation or crack sliding of coal and rock to be consumed. The stored elastic energy will be released during the unloading process along with the recovery of deformation.

[0127] According to some embodiments, the total input energy U under uniaxial loading and unloading conditions is generated by the work of the axial stress in the loading process, which may, for example, be as shown in formula (1).

[0128]

[0129] wherein σ 1j is the jth axial stress recorded in the ith cyclic loading, σ 1j-1 is the j-1th axial stress in the ith cyclic loading, ε 1j , and ε 1j-1 are the strains corresponding to the stresses, respectively, and n is the number of cyclic loadings.

[0130] In some embodiments, during the loading process, the accumulated elastic energy, i.e., the elastic energy U e and the dissipated energy U d cannot be directly calculated, but the accumulated elastic energy in the same cyclic loading is released by the negative work done by the loading plate during unloading. Therefore, the elastic energy during loading can be calculated by the work done during unloading, for example, the accurate elastic energy U e can be obtained by integrating the unloading stress-strain curve, for example, as shown in equation (2).

[0131]

[0132] wherein σ 1uj is the jth axial stress recorded in the ith cyclic unloading, σ 1uj-1 is the j-1th axial stress recorded in the ith cyclic unloading, ε 1uj , and ε 1uj-1 are the strains corresponding to the stresses, respectively.

[0133] In some embodiments, the dissipated energy U d during the loading process is the difference between the input energy U1 corresponding to the loading process and the accumulated elastic energy U e , for example, as shown in equation (3).

[0134]

[0135] According to some embodiments, since the elastic deformation includes linear elasticity and nonlinear elasticity, the simplified calculation method only considers the elastic energy generated by linear elastic deformation and ignores the elastic energy caused by nonlinear elastic deformation. This simplified calculation method overestimates the plastic energy of the loaded coal sample and underestimates the elastic energy, which underestimates the possibility of dynamic failure of the coal rock itself and brings risks and hidden dangers to the safe and efficient mining of the coal seam. In embodiments of the present disclosure, with peak stress loading, the plastic dissipated energy of the loaded and unloaded coal rock and the cumulative acoustic emission energy significantly increase. To accurately evaluate the energy evolution of the loaded coal rock, the relationship between the plastic energy and the acoustic emission energy of the H coal sample and the M coal sample tests is established, for example, as shown in equation (4). The H coal sample and the M coal sample are any two coal samples in at least one second coal sample.

[0136]

[0137] wherein U AE is the acoustic emission cumulative energy, U d is the dissipated energy. The specific numerical value can be replaced by other numerical values, and does not refer to a fixed numerical value. Wherein, Figure 5 An example of a dissipated energy density and acoustic emission (AE) cumulative energy is shown. The at least one second coal sample can include coal sample M-1, coal sample M-3 and coal sample H-4.

[0138] According to some embodiments, as Figure 3 shown, for example, a coal sample uniaxial compression test can be carried out to monitor the acoustic emission characteristics, to obtain the acoustic emission cumulative energy of the coal sample in the pre-peak stage, and to obtain the dissipated energy of the coal sample in the loading process according to the quantitative display mathematical model of the dissipated energy and the acoustic emission cumulative energy.

[0139] According to some embodiments, when assessing the impact tendency of the first coal sample, for example, the stress-strain curve of the loaded coal sample can be monitored to calculate the acoustic emission cumulative energy and the pre-peak input energy, and the dissipated energy of the loaded coal sample can be obtained according to the quantitative relationship between the acoustic emission characteristics and the dissipated energy, and the difference between the input energy U2 and the dissipated energy U d is the elastic accumulation energy U e , wherein the specific example can be as shown in Figure 6 .

[0140] Specifically, the acoustic emission cumulative energy in the uniaxial loading process and formula (4) can be obtained, and the first dissipated energy U d1 in the loading process can be obtained based on formula (5) through the relationship between the input energy, the dissipated energy and the elastic energy. e1 .

[0141]

[0142] In step S24, the elastic energy index of the first coal sample is obtained according to the first elastic energy and the first dissipated energy;

[0143] Wherein, the relevant description can be as described above, and will not be repeated here.

[0144] According to some embodiments, the specific calculation formula of the first elastic energy index can be as shown in formula (6):

[0145] W ET = U e / U d1 (6)

[0146] Wherein, W ETis a first elastic index.

[0147] According to some embodiments, as shown in FIG. 6, for example, the input energy can be obtained by integrating the pre-peak curve according to the stress-strain characteristic curve of the coal sample, the difference between the input energy and the dissipated energy is the elastic energy, the ratio of the elastic energy and the dissipated energy is calculated to obtain the elastic energy index. Figure 3

[0148] In step S25, the impact energy index of the first coal sample is obtained according to the stress-strain characteristic;

[0149] For example, the related descriptions can be as described above, which will not be repeated here.

[0150] The impact energy index of the first coal sample is obtained according to the stress-strain characteristic, including:

[0151] The elastic modulus of the first coal sample in the process of loading the preset force is obtained according to the stress-strain characteristic, wherein the elastic modulus is used to indicate the modulus value of the first input energy of the first coal sample in the process of loading the preset force;

[0152] The softening modulus corresponding to the first coal sample is obtained, wherein the softening modulus is used to indicate the modulus value of the first dissipated energy of the first coal sample in the process of loading the preset force;

[0153] The ratio of the elastic modulus and the softening modulus is taken as the impact energy index of the first coal sample. Therefore, the accuracy of obtaining the impact energy index can be improved, and the accuracy of determining the impact tendency of the coal sample can be improved.

[0154] In step S26, the uniaxial compressive strength and the failure duration of the first coal sample are obtained according to the stress-time relationship curve of the coal sample;

[0155] For example, the related descriptions can be as described above, which will not be repeated here.

[0156] In step S27, the impact tendency of the first coal sample is evaluated according to the elastic energy index, the impact energy index, the uniaxial compressive strength and the failure duration by using the impact tendency evaluation mode, and the impact tendency of the first coal sample is obtained.

[0157] For example, the related descriptions can be as described above, which will not be repeated here.

[0158] According to some embodiments, the method further includes:

[0159] The environmental information corresponding to the first coal sample is obtained;

[0160] The impact tendency of the first coal sample is corrected by using the environmental information, and the corrected impact tendency is obtained. Therefore, the impact tendency can be corrected by using the environmental information, and the accuracy of obtaining the impact tendency can be improved.​

[0161] The environmental information may include, for example, temperature, gas content, and the like.

[0162] According to some embodiments, as shown in Figure 3 For example, the uniaxial compressive strength, the failure time, the elastic modulus, the softening modulus, the post-peak energy loss, the impact energy index, and the impact tendency of the coal sample may be obtained according to the stress-time curve of the coal sample, the impact tendency evaluation method of the coal sample, and the uniaxial compressive strength, the failure time, the elastic energy index, and the impact energy index.

[0163] In one or related embodiments, when the first coal sample is under a preset force, the first input energy is obtained according to the stress-strain characteristics and the pre-peak data of the first coal sample; the first dissipated energy of the first coal sample under the preset force is obtained according to the cumulative acoustic emission energy corresponding to the pre-peak stage and the quantitative relationship between the cumulative acoustic emission energy and the dissipated energy; the first elastic energy of the first coal sample under the preset force is obtained according to the first input energy and the first dissipated energy; and the elastic energy index of the first coal sample is obtained according to the first elastic energy and the first dissipated energy. Thus, the elastic energy index can be determined according to the quantitative relationship, the test repeatability can be reduced, the test contingency and subjectivity can be reduced, the inaccuracy of the elastic energy index can be reduced, the accuracy of the elastic energy index can be improved, and the accuracy and convenience of the impact tendency evaluation of the coal sample can be improved.

[0164] A block diagram of an apparatus for evaluating the impact tendency of coal based on acoustic emission energy according to an example embodiment is shown. Referring to Figure 7 The apparatus 700 includes:

[0165] The index obtaining unit 701 is configured to obtain the elastic energy index of the first coal sample based on the acoustic emission characteristics and the stress-strain characteristics when the first coal sample is under a preset force.

[0166] The index obtaining unit 701 is further configured to obtain the impact energy index of the first coal sample according to the stress-strain characteristics.

[0167] The data obtaining unit 702 is configured to obtain the uniaxial compressive strength and the failure time of the first coal sample according to the stress-time curve of the coal sample.

[0168] The tendency evaluation unit 703 is configured to evaluate the impact tendency of the first coal sample according to the elastic energy index, the impact energy index, the uniaxial compressive strength, and the failure time using the impact tendency evaluation method, and obtain the impact tendency of the first coal sample.

[0169] According to some embodiments, the index obtaining unit 701 is specifically used for obtaining the elastic energy index of the first coal sample based on the acoustic emission cumulative energy and the stress-strain characteristics when the first coal sample is under the preset action force, and is specifically used for:

[0170] obtaining the first input energy according to the stress-strain characteristics and the peak-before data of the first coal sample when the first coal sample is under the preset action force;

[0171] obtaining the first dissipated energy of the first coal sample in the process of loading the preset action force according to the acoustic emission cumulative energy corresponding to the peak-before stage and the quantitative relationship between the acoustic emission cumulative energy and the dissipated energy;

[0172] obtaining the first elastic energy of the first coal sample in the process of loading the preset action force according to the first input energy and the first dissipated energy;

[0173] obtaining the elastic energy index of the first coal sample according to the first elastic energy and the first dissipated energy.

[0174] According to some embodiments, the index obtaining unit 701 is specifically used for:

[0175] obtaining the quantitative relationship between the acoustic emission cumulative energy and the dissipated energy when at least one second coal sample is under the uniaxial loading and unloading action force.

[0176] According to some embodiments, the index obtaining unit 701 is specifically used for obtaining the quantitative relationship between the acoustic emission cumulative energy and the dissipated energy when at least one second coal sample is under the uniaxial loading and unloading action force, and is specifically used for:

[0177] obtaining the axial stress set and the strain set corresponding to any second coal sample according to the second input energy when at least one second coal sample is under the uniaxial loading and unloading action force;

[0178] obtaining the second elastic energy corresponding to any second coal sample according to the axial stress set and the strain set corresponding to any second coal sample and the unloading stress-strain curve of any second coal sample;

[0179] obtaining the third input energy corresponding to any second coal sample under the uniaxial loading action force;

[0180] obtaining the second dissipated energy of any second coal sample under the uniaxial loading action force according to the third input energy and the second elastic energy;

[0181] obtaining the quantitative relationship between the acoustic emission cumulative energy and the dissipated energy according to the third input energy and the second dissipated energy.

[0182] According to some embodiments, the index obtaining unit 701 is configured to obtain the impact energy index of the first coal sample according to the stress-strain feature, and specifically configured to:

[0183] According to the stress-strain feature, obtain the elastic modulus of the first coal sample in the process of loading the preset force, wherein the elastic modulus is used to indicate the modulus value of the first input energy of the first coal sample in the process of loading the preset force;

[0184] Obtain the softening modulus corresponding to the first coal sample, wherein the softening modulus is used to indicate the modulus value of the first dissipation energy of the first coal sample in the process of loading the preset force;

[0185] Take the ratio of the elastic modulus and the softening modulus as the impact energy index of the first coal sample.

[0186] According to some embodiments, the index obtaining unit 701 is further configured to:

[0187] Obtain the environmental information corresponding to the first coal sample;

[0188] Correct the impact tendency of the first coal sample by using the environmental information, and obtain the corrected impact tendency.

[0189] According to some embodiments, the index obtaining unit 701 is further configured to:

[0190] Obtain the coal sample information corresponding to the first coal sample;

[0191] According to the coal sample information, obtain the loading information corresponding to the first coal sample, wherein the loading information includes the force loading mode and the preset force.

[0192] Regarding the device in the above embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments related to the method, and will not be described in detail here.

[0193] In some or related embodiments, the index acquisition unit is configured to acquire an elastic energy index of the first coal sample based on the acoustic emission characteristics and the stress-strain characteristics when the first coal sample is under the preset loading force; the index acquisition unit is further configured to acquire an impact energy index of the first coal sample according to the stress-strain characteristics; the data acquisition unit is configured to acquire the uniaxial compressive strength and the failure duration of the first coal sample according to the stress-time curve of the coal sample; and the tendency evaluation unit is configured to evaluate the impact tendency of the first coal sample according to the elastic energy index, the impact energy index, the uniaxial compressive strength and the failure duration by using the impact tendency evaluation method, so as to acquire the impact tendency of the first coal sample. Therefore, the characteristic information can be acquired in advance, the evaluation parameters can be acquired, the impact tendency can be directly evaluated according to the corresponding evaluation parameters, the repeated loading and unloading test is not needed, the situation that the failure rate of the loading and unloading test is high and the repeated test is needed is reduced, the cumbersome steps of the loading and unloading test are reduced, the efficiency of the impact tendency evaluation of the coal sample is improved, the situation that the impact tendency evaluation is determined by the artificial according to the test result is reduced, the subjectivity and the contingency of the impact tendency evaluation are reduced, the accuracy and the convenience of the impact tendency evaluation of the coal sample are improved.

[0194] Figure 8 A schematic block diagram of an example electronic device 800 that can be used to implement embodiments of the present disclosure is shown. The electronic device 800 is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital assistants, cellular telephones, smartphones, wearable devices, and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the present disclosure described and / or claimed in this document.

[0195] As Figure 8 shown, the electronic device 800 includes a computing unit 801 that can perform various suitable actions and processes in accordance with computer programs stored in a read-only memory (ROM) 802 or loaded into a random access memory (RAM) 803 from a storage unit 808. Various programs and data needed in operation of the electronic device 800 can also be stored in the RAM 803. The computing unit 801, the ROM 802, and the RAM 803 are connected to each other by a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0196] A plurality of components in the electronic device 800 are connected to the I / O interface 805, including: an input unit 806, such as a keyboard, a mouse, etc.; an output unit 807, such as various types of displays, speakers, etc.; a storage unit 808, such as a magnetic disk, an optical disk, etc.; and a communication unit 809, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 809 allows the electronic device 800 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0197] The computing unit 801 can be various general and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 801 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The computing unit 801 performs various methods and processes described above. For example, in some embodiments, the above-described methods can be implemented as a computer software program, which is tangibly embodied in a machine-readable medium, such as the storage unit 808. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 800 via the ROM 802 and / or the communication unit 809. When the computer program is loaded onto the RAM 803 and executed by the computing unit 801, one or more steps of the above-described methods can be performed. Alternatively, in other embodiments, the computing unit 801 can be configured to perform the above-described methods by any other appropriate means, such as by means of firmware.

[0198] Various implementations of the systems and techniques described above herein can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0199] Program code for carrying out methods of the present disclosure can be written in any combination of one or more programming languages. The program code can be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the program code, when executed by the processor or controller, produces the functions / operations specified in the flowcharts and / or block diagrams. The program code can be executed entirely on a machine, partially on a machine, partially on a machine as a standalone software package, or entirely on a remote machine or server.

[0200] In the context of the present disclosure, a machine-readable medium can be a tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include but is not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine-readable storage medium will include one or more lines of electrical connections, portable computer disks, hard disk drives, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or Flash memory), optical fibers, portable compact disc read-only memories (CD-ROMs), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0201] To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the computer. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0202] The systems and techniques described herein can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described herein), or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), the Internet, and a blockchain network.

[0203] The computer system can include clients and servers. The clients and the servers are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS (Virtual Private Server, or VPS for short) services. The server can also be a server of a distributed system, or a server combined with a blockchain.

[0204] It should be understood that various forms of flow shown above can be used with reordering, additions, or removals of steps. For example, each of the steps recited in the present disclosure can be performed in parallel or in sequence, in a different order, without limitation herein, as long as the desired results of the technology disclosed in the present disclosure are achieved.

[0205] The specific embodiments described above are not intended to be limiting, and persons skilled in the art will appreciate that various modifications, combinations, sub-combinations and alternatives can be made to the specific embodiments without departing from the spirit and principles of the disclosure. Any further modifications, equivalents or alternatives within the spirit and principles of the disclosure are to be considered as falling within the scope of the disclosure.

Claims

1. A method for evaluating coal impactability based on acoustic emission energy, characterized by, include: When the first coal sample is subjected to a preset loading force, the elastic energy index of the first coal sample is obtained based on acoustic emission characteristics and stress-strain characteristics. Based on the stress-strain characteristics, the impact energy index of the first coal sample is obtained; Based on the stress-time relationship curve of the coal sample, the uniaxial compressive strength and failure time of the first coal sample are obtained; An impact tendency evaluation method is adopted to evaluate the impact tendency of the first coal sample based on the elastic energy index, impact energy index, uniaxial compressive strength and failure time, so as to obtain the impact tendency of the first coal sample.

2. The method of claim 1, wherein, The step of obtaining the elastic energy index of the first coal sample based on the cumulative acoustic emission energy and stress-strain characteristics when the first coal sample is subjected to a preset loading force includes: When the first coal sample is subjected to a preset loading force, the first input energy is obtained based on the stress-strain characteristics and pre-peak data of the first coal sample. Based on the cumulative acoustic emission energy corresponding to the pre-peak stage and the quantitative relationship between the cumulative acoustic emission energy and the dissipated energy, the first dissipated energy of the first coal sample during the loading of the preset force is obtained. Based on the first input energy and the first dissipated energy, the first elastic energy of the first coal sample during the loading of a preset force is obtained; The elastic energy index of the first coal sample is obtained based on the first elastic energy and the first dissipated energy.

3. The method of claim 2, wherein, The method further includes: Under the condition that at least one second coal sample is subjected to uniaxial loading and unloading force, obtain the quantitative relationship between the cumulative acoustic emission energy and the dissipated energy.

4. The method of claim 3, wherein, The method of obtaining the quantitative relationship between the cumulative acoustic emission energy and the dissipated energy under the condition that at least one second coal sample is under uniaxial loading and unloading force includes: When at least one second coal sample is under uniaxial loading and unloading force conditions, the axial stress set and strain set corresponding to any second coal sample are obtained according to the second input energy. Based on the axial stress set, the strain set, and the unloading stress-strain curve of any second coal sample, the second elastic energy corresponding to any second coal sample is obtained. Obtain the third input energy corresponding to any second coal sample under uniaxial loading force; Based on the third input energy and the second elastic energy, obtain the second dissipated energy of any second coal sample under uniaxial loading force. Based on the third input energy and the second dissipated energy, a quantitative relationship between the cumulative acoustic emission energy and the dissipated energy is obtained.

5. The method of claim 1, wherein, The step of obtaining the impact energy index of the first coal sample based on the stress-strain characteristics includes: Based on the stress-strain characteristics, the elastic modulus of the first coal sample during the loading of a preset force is obtained, wherein the elastic modulus is used to indicate the modulus of the first input energy of the first coal sample during the loading of the preset force. Obtain the softening modulus corresponding to the first coal sample, wherein the softening modulus is used to indicate the modulus of the first dissipated energy of the first coal sample during the loading of a preset force; The ratio of the elastic modulus to the softening modulus is used as the impact energy index of the first coal sample.

6. The method of claim 1, wherein, The method further comprises: obtaining environmental information corresponding to the first coal sample; correcting the impact tendency of the first coal sample by using the environmental information to obtain a corrected impact tendency.

7. The method of claim 1, wherein, The method further comprises: obtaining coal sample information corresponding to the first coal sample; obtaining loading information corresponding to the first coal sample according to the coal sample information, wherein the loading information comprises a force loading mode and the preset force.

8. An apparatus for evaluating coal impactability based on acoustic emission energy, characterized by comprising: a coal impactability evaluation device according to any one of claims 1 to 7; and a coal impactability evaluation device according to any one of claims 1 to 7. It comprises: an index acquisition unit configured to acquire an elastic energy index of the first coal sample based on acoustic emission characteristics and stress-strain characteristics when the first coal sample is under a preset force loading; the index acquisition unit is further configured to acquire an impact energy index of the first coal sample according to the stress-strain characteristics; a data acquisition unit configured to acquire the uniaxial compressive strength and the failure duration of the first coal sample according to a stress-time relationship curve of the coal sample; a tendency evaluation unit configured to evaluate the impact tendency of the first coal sample according to the elastic energy index, the impact energy index, the uniaxial compressive strength and the failure duration by using an impact tendency evaluation method to obtain the impact tendency of the first coal sample.

9. An electronic device, comprising: It comprises: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to execute the instructions to implement the evaluation method of the coal impact tendency based on acoustic emission energy according to any one of claims 1 to 7.

10. A storage medium, the storage medium storing instructions, wherein, When the instructions run on the electronic device, the electronic device executes the evaluation method of the coal impact tendency based on acoustic emission energy according to any one of claims 1 to 7.

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