CN110991824B - Method, device and storage medium for identifying coal rock impact tendency - Google Patents
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Abstract
The invention discloses a method, a device and a storage medium for identifying the impact tendency of coal and rock, and relates to the field of geotechnical engineering and mining engineering. Comprising the following steps: determining an identification standard for identifying the impact tendency of the coal rock through the cohesive force of the coal rock; measuring cohesion of coal rock to be identified; and comparing the cohesive force with a preset threshold value, and identifying the impact tendency of the coal rock according to the identification standard. The method provided by the invention is suitable for identifying the impact tendentiousness of the coal rock, has the advantages of simple and efficient identification process, and improves the accuracy of identifying the impact tendentiousness of the coal rock.
Description
Technical Field
The present invention relates to the field of geotechnical engineering and mining engineering, and more particularly, to a method, apparatus and storage medium for identifying coal rock impact tendencies.
Background
The rock burst problem of deep coal rock is an important problem in the deep rock mass mechanics of mines, the rock burst is the dynamic phenomenon that the coal rock around a roadway or a working surface is suddenly and severely damaged due to the instant release of elastic deformation energy, and the rock burst is very strong in destructiveness and is one of the serious disasters of the coal mine.
At present, rock burst can be described by impact tendencySaid. In the current standard of the coal industry, the impact propensity of coal rock is determined by measuring the following indicators, including: uniaxial compressive Strength R C Impact energy index K E Elastic energy index W ET And dynamic destruction time D T However, current methods of identifying coal rock impact tendencies have the following disadvantages:
firstly, the elastic energy index only considers the part of the coal sample before reaching the peak value in the uniaxial compression process, the dynamic destruction time only considers the part of the coal sample after reaching the peak value in the uniaxial compression process, and the uniaxial compression strength only considers one point of the peak value. All three indexes cannot comprehensively consider the whole process of the stress-strain curve of the coal; secondly, the above indexes only consider the single aspect of impact tendency, wherein some indexes show that coal samples are strong impact, and some indexes show that the coal samples are weak impact and even no impact, so that the coal is used for identifying, the phenomena of large discreteness or contradictory results can exist, when the indexes are particularly dangerous, the indexes can be averaged by other indexes, the phenomena of underestimation exist in the evaluation, and the impact tendency of the coal obtained by identification is not accurate and objective enough.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method, a device and a storage medium for identifying the impact tendency of coal and rock aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows:
a method for identifying coal rock impact tendencies comprising:
identifying the cohesion of the coal rock to be identified;
and comparing the cohesive force with a preset threshold value, and obtaining the impact tendency of the coal rock according to a comparison result.
The beneficial effects of the invention are as follows: compared with the traditional coal rock impact tendency identification method, the method provided by the invention does not need a plurality of indexes to carry out measurement, has the advantage of quick identification process, has a certain functional relation with the traditional indexes for measuring the coal rock impact tendency, can fully reflect the multi-aspect influence of the traditional indexes on the coal rock impact tendency, and further improves the accuracy of coal rock impact tendency identification.
The other technical scheme for solving the technical problems is as follows:
a storage medium having instructions stored therein which, when read by a computer, cause the computer to perform a method for identifying a coal rock impact propensity according to the above described aspects.
The other technical scheme for solving the technical problems is as follows:
an apparatus for identifying coal rock impact tendencies comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement the method for identifying the impact tendency of coal and rock according to the technical scheme.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic flow chart provided by an embodiment of a method of the present invention for identifying coal rock impact tendencies;
FIG. 2 is a schematic diagram of a pre-peak curve and a pressure relief curve of a coal sample provided by an embodiment of a method for identifying coal-rock impact tendencies of the present invention;
FIG. 3 is a graphical illustration of a full stress strain curve of a coal sample provided by an embodiment of a method of the present invention for identifying coal rock impact tendencies;
FIG. 4 is a graphical representation of uniaxial compressive strength versus cohesion provided by other embodiments of the method of the present invention for identifying coal rock impact tendencies;
FIG. 5 is a graphical representation of impact energy index versus cohesion provided by other embodiments of the method of the present invention for identifying coal rock impact tendencies;
FIG. 6 is a graphical representation of the elastic energy index versus cohesion provided by other embodiments of the method of the present invention for identifying coal rock impact tendencies;
FIG. 7 is a graphical representation of dynamic failure time versus cohesion provided by other embodiments of the method for identifying coal rock impact tendencies of the present invention;
fig. 8 is a schematic view of a structural framework provided by an embodiment of the apparatus for identifying coal rock impact tendencies of the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the illustrated embodiments are provided for illustration only and are not intended to limit the scope of the present invention.
As shown in fig. 1, a schematic flow chart is provided for an embodiment of a method for identifying coal rock impact tendencies according to the present invention, the method comprising:
s1, determining an identification standard for identifying the impact tendency of the coal rock through the cohesion of the coal rock.
S2, measuring the cohesion of the coal rock to be identified.
And S3, comparing the cohesive force with a preset threshold value, and identifying the impact tendency of the coal rock according to the identification standard.
It should be understood that the coal rock described herein may refer to a cylindrical briquette or rock sample of 50mm diameter and 100mm height for use in impact predisposition identification tests.
The preset threshold value can be determined according to an identification standard. For example, assuming that the preset threshold may include a first threshold and a second threshold, when the cohesion is less than the first threshold, the impact tendency of the resulting coal rock is no impact; when the cohesive force is larger than or equal to a first threshold value and smaller than a second threshold value, the impact tendency of the coal rock is obtained to be weak impact; when the cohesive force is larger than the second threshold value, the impact tendency of the obtained coal rock is strong impact.
It should be noted that, the method for identifying the cohesion of the coal rock to be identified may select an existing cohesion identification and measurement method according to actual requirements, for example, the cohesion of the coal rock to be identified may be measured through a triaxial compression experiment, which is not described herein.
In the current standard of coal industry in China, the indexes for representing the impact tendency of coal and rock are 4, namely the uniaxial compressive strength R C Impact energy index K E Elastic energy index W ET And dynamic destruction time D T The method comprises the steps of carrying out a first treatment on the surface of the In the uniaxial compression experiment, the uniaxial compressive strength is the peak strength of the stress-strain curve; the dynamic failure time refers to the time from the ultimate strength to the complete failure of the coal test piece, the elastic energy index refers to the complete unloading of the coal test piece in a uniaxial compression state when the stress reaches 75% -85% of the strength, the ratio of the elastic deformation energy to the plastic deformation energy, and the impact energy index refers to the ratio of the deformation energy accumulated before the peak value to the deformation energy lost after the peak value in a full stress strain curve of the coal test piece in the uniaxial compression state.
The impact tendency of coal and rock is comprehensively measured according to the four indexes, but the current assessment method has the following defects: firstly, the elastic energy index only considers the partial deformation of the coal rock before reaching the peak value in the uniaxial compression process; the dynamic destruction time only considers the part of the coal rock after reaching the peak value in the uniaxial compression process; the uniaxial compressive strength only considers one point of the peak value of the stress-strain curve; impact energy index although considering mechanical properties before and after the peak of the stress-strain curve, it is not easy to obtain the full stress-strain curve. Therefore, the existing four indexes for judging the impact tendency have limitations; and secondly, each index only unilaterally evaluates the intensity of the impact tendency of the coal and rock, so that the evaluation result may have the phenomenon of larger discreteness or contradictory results. Although a fuzzy evaluation method can be adopted, when the index shows that the impact tendency is particularly dangerous, the impact tendency can be averaged by other indexes, so that the underestimation phenomenon exists in the evaluation, and the objective accuracy of measuring the impact tendency is lost.
Based on the above, the inventor performs a lot of experiments to find that a certain functional relationship exists between the cohesive force and the 4 indexes, so in order to more accurately measure the impact tendency of the coal rock, the invention provides a novel method for measuring the impact tendency of the coal rock, namely, the impact tendency of the coal rock is evaluated by using the cohesive force of a single index, and the impact tendency of the coal rock can be conveniently and accurately obtained by measuring the cohesive force of the coal rock.
The principle by which cohesion can be used to evaluate the impact propensity of coal rock will be described below with reference to fig. 2 and 3, taking a coal sample as an example.
As shown in fig. 2, a graph of a pre-peak curve and a pressure relief curve of a coal sample is shown, and as shown in fig. 3, a graph of a full stress strain curve of the coal sample is shown, and the graph can be divided into a pre-peak portion and a post-peak portion. The functional relations between the pre-peak curve, the pressure relief curve, the post-peak curve and the uniaxial compression strength of the uniaxial compression of the coal sample can be set according to the image are respectively as follows:
y＝E 1 x
y＝E 2 x-b 2
y＝-E 3 x+b 3
wherein E is 1 ，E 2 ，E 3 Slope of curve b 2 、b 3 Is a constant coefficient of the equation;
the invention establishes a coal sample parameter database by analyzing the physical and mechanical parameters and impact tendency identification indexes of a plurality of coal sample samples, and can obtain E 1 ，E 2 ，E 3 With uniaxial compressive strength R C The relations between the two are respectively:
E 1 ＝k 1 R c +e 1
E 2 ＝k 2 R c +e 2
wherein k is 1 ，k 2 ，k 3 ，e 1 ，e 2 And e 3 Is a constant coefficient of these three equations.
On the basis, the invention establishes an impact energy index K E Elastic energy index W ET And post-peak strain amount ε post Relationship with the cohesion C of the physical mechanical parameters,the relationship is as follows:
wherein,,
is the friction angle.
It should be appreciated that post-peak strain ε post And D t The direct proportion relation exists between two parameters in the span from the peak value to the complete destruction of the coal sample, so D t The relation with cohesion C can be used epsilon post Relationship with cohesion C.
Also known is uniaxial compressive strength R C The relationship with cohesion C is:
therefore, four impact tendency identification indexes of uniaxial compression strength R can be obtained by combining the above C Impact energy index K E Elastic energy index W ET And dynamic destruction time D T The relation with the cohesive force C is the theoretical basis for evaluating the impact tendency of coal and rock by using the cohesive force.
Compared with the traditional coal rock impact tendency identification method, the method provided by the embodiment does not need a plurality of indexes to be measured by identifying the cohesive force of the coal rock and then determining the impact tendency of the coal rock according to the identified cohesive force, has the advantage of quick identification process, has a certain functional relation with the traditional indexes for measuring the impact tendency of the coal rock, and can fully reflect the multi-aspect influence of the existing indexes on the impact tendency of the coal rock, thereby improving the accuracy of the coal rock impact tendency identification.
Optionally, in some embodiments, the determination of the cohesion of the coal rock to be identified specifically includes:
and measuring the coal rock to be identified through a triaxial compression test to obtain the cohesion of the coal rock to be identified.
Optionally, in some embodiments, comparing the cohesion to a preset threshold value, and identifying the impact propensity of the coal rock according to the identification criteria specifically includes:
respectively comparing the cohesive force with a preset first threshold value and a preset second threshold value, wherein the first threshold value and the second threshold value are determined according to the identification standard;
when C is less than T 1 When the impact tendency of the coal rock is no impact;
when T is 1 ≤C＜T 2 When the impact tendency of the obtained coal rock is weak impact;
when C is greater than or equal to T 2 When the impact tendency of the coal rock is strong impact;
wherein T is 1 Is a first threshold value, T 2 Is a second threshold value, and T 1 ＜T 2 C is cohesion.
For example, as shown in table 1, an exemplary impact tendency judgment criterion is given.
TABLE 1 impact tendency judgment criteria
As can be seen from table 1, when the cohesion is less than 1.5MPa, it is shown that the coal rock to be identified at this time has no impact tendency; when the cohesion is between 1.5MPa and 4.0MPa, the coal rock to be identified has weaker impact tendency; when the cohesive force is more than 4.0MPa, the coal rock to be identified has stronger impact tendency.
It should be understood that the present invention focuses on identifying the impact tendency of the coal rock through the cohesive force, and how much specific cohesive force corresponds to which level of impact tendency can be set according to the actual requirement, for example, the impact tendency can also be divided into 4 levels, namely no impact, weaker impact, stronger impact and extremely strong impact, respectively corresponding to different cohesive force ranges, which can be set according to the actual requirement, and will not be repeated herein.
In addition, in addition to the quantitative result of impact tendency, the tendency of impact can be reflected by the value of cohesive force, and the larger the cohesive force value is, the larger the impact tendency of coal rock is indicated.
Optionally, in some embodiments, the preset threshold is determined according to the following steps:
carrying out a uniaxial compression experiment on target coal rock, and determining preset indexes of the target coal rock, wherein the preset indexes are the existing national standards for evaluating the impact tendency of the coal rock; determining the corresponding relation between the cohesive force and the impact tendency according to the corresponding relation between the preset index and the cohesive force;
and determining a preset threshold according to the corresponding relation between the cohesive force and the impact tendency.
For uniaxial compressive strength R C When R is C At < 7.0, the impact tendency is no impact; when R is 7.0 to less than or equal to R C At < 14.0, the impact tendency is weak impact; when R is C At > 14.0, the impact tendency is strong.
When R is C When=7.0, the corresponding cohesion c=1.9; when R is C When=14.0, the corresponding cohesion c=3.8.
For impact energy index K E When K is E When the impact tendency is less than 1.5, the impact is no impact; when K is 1.5 to less than or equal to K E When less than 5.0, the impact tendency is weak impact; when K is E At > 5.0, the impact tendency is strong.
When K is E When=1.5, the corresponding cohesion c=1.8; when K is E When=5.0, the corresponding cohesion c=4.1.
For the elastic energy index W ET When W is ET When less than 2.0, the impact tendency isNo impact; when W is more than or equal to 2.0 ET When less than 5.0, the impact tendency is weak impact; when W is ET At > 5.0, the impact tendency is strong.
When W is ET When=2.0, the corresponding cohesion c=1.5; when W is ET When=5.0, the corresponding cohesion c=3.9.
For dynamic destruction time D T When D T At < 50, the impact tendency is no impact; when 50 is less than or equal to D T When the impact tendency is less than 500, the impact tendency is weak; when D is T At > 500, the impact tendency is strong.
When D is T When=50, the corresponding cohesion c=1.8; when D is T When=500, the corresponding cohesion c=4.1. Then, according to the relation between the 4 indexes and the cohesive force, the cohesive force identification standard can be obtained after comprehensive analysis treatment: when C is less than 1.5, the impact tendency is no impact; when C is more than or equal to 1.5 and less than 4.0, the impact tendency is weak impact; when C > 4.0, the impact tendency is strong impact.
For example, the weight may be determined according to the influence degree of 4 indexes on the impact tendency, and the cohesive force identification standard may be determined according to the weight, or a more accurate cohesive force identification standard may be obtained by other data processing methods, which will not be described herein.
It should be understood that the foregoing is illustrative only and does not represent actual numerical values.
Optionally, in some embodiments, the preset index includes: uniaxial compressive strength, impact energy index, elastic energy index or dynamic failure time.
As shown in FIGS. 4 to 7, uniaxial compressive strength R is given in order C Impact energy index K E Elastic energy index W ET And dynamic destruction time D T Graph of the corresponding cohesion.
In FIGS. 4 to 7, the horizontal axis represents cohesive force C in MPa, and the vertical axis of FIG. 4 represents uniaxial compressive strength R C Impact energy index K of FIG. 5 E The vertical axis of FIG. 6 is the elastic energy index W ET The vertical axis of FIG. 7 shows the dynamic destruction time D T 。
Discrete points in each graph are measured values obtained through a uniaxial compression experiment, solid lines are curves obtained through fitting, and broken lines are fitted curves of theoretical values. According to impact tendency evaluation criteria of each index, three areas, namely a strong impact area, a weak impact area and a no impact area, can be divided into corresponding numerical values in the figure through dotted lines from top to bottom. Finding the intersection point of the fitting curve and the region boundary on the position of the horizontal axis, the corresponding relation between cohesive force and impact tendency can be obtained through comprehensive analysis, and therefore the threshold value is determined.
Optionally, in some embodiments, determining the correspondence between cohesive force and impact tendency according to the correspondence between the preset index and impact tendency specifically includes:
establishing a functional relation between a preset index of target coal rock and corresponding cohesive force, and drawing a relation graph of the preset index and the corresponding cohesive force;
marking a preset index and an evaluation range of impact tendency in a graph;
and according to the evaluation range, determining the corresponding relation between the cohesive force and the impact tendency.
Optionally, in some embodiments, determining the preset threshold according to the correspondence between cohesive force and impact tendency specifically includes:
and taking the cohesive force value at the end point of the evaluation range as a preset threshold value.
It is to be understood that in some embodiments, some or all of the alternatives described in the various embodiments above may be included.
In other embodiments of the present invention, there is also provided a storage medium having instructions stored therein, which when read by a computer, cause the computer to perform the method for identifying a coal rock impact propensity as described in any of the embodiments above.
As shown in fig. 8, in other embodiments of the present invention, there is also provided an apparatus for identifying a coal rock impact tendency, including:
a memory 1 for storing a computer program;
a processor 2 for executing a computer program implementing a method for identifying a coal rock impact propensity according to any of the embodiments described above.
The reader will appreciate that in the description of this specification, a description of terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the method embodiments described above are merely illustrative, e.g., the division of steps is merely a logical function division, and there may be additional divisions of actual implementation, e.g., multiple steps may be combined or integrated into another step, or some features may be omitted or not performed.
The above-described method, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention is essentially or a part contributing to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-only memory (ROM), a random access memory (RAM, randomAccessMemory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The present invention is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and these modifications and substitutions are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (5)
1. A method for identifying coal rock impact tendencies comprising:
determining an identification standard for identifying the impact tendency of the coal rock through the cohesive force of the coal rock;
measuring cohesion of coal rock to be identified;
comparing the cohesion with a preset threshold value, and identifying the impact tendency of the coal rock according to the identification standard;
wherein the preset threshold is determined by:
carrying out a uniaxial compression experiment on target coal rock, and determining preset indexes of the target coal rock, wherein the preset indexes are existing national standards for evaluating the impact tendency of the coal rock, and comprise uniaxial compressive strength, impact energy index, elastic energy index or dynamic destruction time;
determining the corresponding relation between the cohesive force and the impact tendency according to the corresponding relation between the preset index and the cohesive force;
determining the preset threshold according to the corresponding relation between cohesive force and impact tendency;
wherein, the determining the corresponding relation between the cohesive force and the impact tendency according to the corresponding relation between the preset index and the cohesive force comprises:
establishing a functional relation between a preset index of the target coal rock and the corresponding cohesive force, and drawing a relation graph of the preset index and the corresponding cohesive force;
marking the evaluation range of the preset index and the impact tendency in the graph;
according to the evaluation range, determining the corresponding relation between cohesive force and impact tendency;
wherein the determining the preset threshold according to the correspondence between cohesive force and impact tendency includes:
taking the cohesive force value at the end point of the evaluation range as a preset threshold value;
the functional relation between the preset index of the target coal rock and the corresponding cohesive force is as follows:
wherein R is c Represents the uniaxial compressive strength, C represents the cohesive force,
represents the friction angle, K E Representing the impact energy index, k 1 、k 2 、k 3 、e 1 、e 2 And e 3 All are constant coefficients, W ET Representing the elastic energy index, ε post Representation ofThe dynamic destruction time, E 3 The slope of the curve representing the curve after the peak of the coal rock.
2. The method for identifying coal rock impact tendencies according to claim 1, wherein the determination of the cohesion of the coal rock to be identified specifically comprises:
and measuring the coal rock to be identified through a triaxial compression test to obtain the cohesion of the coal rock to be identified.
3. The method for identifying a coal rock impact propensity according to claim 1, wherein the cohesion is compared with a preset threshold value, and wherein the identification of the impact propensity of the coal rock according to the identification criteria comprises in particular:
comparing the cohesive force with a preset first threshold value and a preset second threshold value respectively, wherein the first threshold value and the second threshold value are determined according to the identification standard;
when C is less than T 1 When the impact tendency of the coal rock is no impact;
when T is 1 ≤C＜T 2 When the impact tendency of the coal rock is weak impact;
when C is greater than or equal to T 2 When the impact tendency of the coal rock is strong impact;
wherein T is 1 Is a first threshold value, T 2 Is a second threshold value, and T 1 ＜T 2 C is cohesion.
4. A storage medium having instructions stored therein which, when read by a computer, cause the computer to perform the method for identifying coal rock impact tendencies of any one of claims 1 to 3.
5. An apparatus for identifying coal rock impact tendencies comprising:
a memory for storing a computer program;
a processor for executing the computer program for implementing the method for identifying coal rock impact tendencies according to any one of claims 1 to 3.
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