CN-121981594-A - Mining rock mass analysis method and system based on in-situ small hole detection

CN121981594ACN 121981594 ACN121981594 ACN 121981594ACN-121981594-A

Abstract

The invention provides a mining rock mass analysis method and system based on in-situ small hole detection, and belongs to the technical field of rock mass analysis. The method comprises the steps of correspondingly executing rock mass evaluation of target roadway surrounding rock based on crack development conditions and geomechanical parameters of the target roadway surrounding rock before/after mining influence to obtain rock mass comprehensive indexes of the target roadway surrounding rock before/after mining influence, respectively matching a stability evaluation grade of the surrounding rock before mining influence, a stability evaluation grade of the surrounding rock after mining influence and a mining influence effect grade based on the obtained rock mass comprehensive indexes before/after mining influence and change conditions of the rock mass comprehensive indexes before/after mining influence, and synthesizing matching results of all grades to obtain a mining rock mass analysis result of the target roadway surrounding rock. The method realizes the purpose of truly reflecting the rock mass distribution characteristics after mining influence and guiding the control of surrounding rocks of the roadway.

Inventors

LIU XIAOMING
GAO XIANGYU
DAI YONGGANG
DONG DINGYU
ZHANG YIJIN

Assignees

国家能源集团宁夏煤业有限责任公司
中国矿业大学

Dates

Publication Date: 20260505
Application Date: 20251229

Claims (10)

1. The mining rock mass analysis method based on in-situ small hole detection is characterized by comprising the following steps of: Correspondingly executing rock mass quality evaluation of the target roadway surrounding rock based on crack development conditions and geomechanical parameters of the target roadway surrounding rock before/after mining influence so as to obtain a rock mass comprehensive index of the target roadway surrounding rock before/after mining influence; Based on the obtained rock mass comprehensive indexes before/after mining influence and the change condition of the rock mass comprehensive indexes before/after mining influence, respectively matching the stability evaluation grade of surrounding rock before mining, the stability evaluation grade of surrounding rock after mining influence and the mining influence effect grade; And synthesizing the matching results of the levels to obtain the quality analysis result of the mining rock mass of the target roadway surrounding rock.
2. The method for analyzing the quality of the mined rock mass based on the in-situ pinhole detection as set forth in claim 1, wherein the rule for obtaining the rock mass comprehensive index of the target roadway surrounding rock before/after mining influence comprises: Respectively counting crack development conditions and geomechanical parameters of each evaluation interval of the target roadway surrounding rock before/after mining influence, wherein each evaluation interval is obtained by dividing according to detection depths for acquiring the crack development conditions and the geomechanical parameters; Matching rock mass quality evaluation rules based on the current historical data quantity of target roadway surrounding rocks, and executing rock mass quality evaluation of the corresponding evaluation interval before/after the mining influence by utilizing crack development conditions and geomechanical parameters of the same evaluation interval before/after the mining influence based on the matched rock mass quality evaluation rules; And correspondingly determining the rock mass comprehensive index of the surrounding rock of the target roadway before/after the mining influence based on rock mass quality evaluation results of each evaluation interval before/after the mining influence.
3. The method for analyzing the quality of the mined rock mass based on the in-situ pinhole detection as set forth in claim 2, wherein the matching of the current historical data quantity of the surrounding rock of the target roadway to the rock mass quality evaluation rule includes: Respectively aiming at the situation before/after mining influence, taking the crack development condition and geomechanical parameters of the same evaluation interval as surrounding rock quality evaluation index parameters of the corresponding evaluation interval; When the current historical data quantity of the target roadway surrounding rock is lower than a preset quantity threshold value, determining a rock mass evaluation rule to be data weights of surrounding rock mass evaluation index parameters in different threshold value ranges in the same evaluation interval by adopting a analytic hierarchy process, and constructing a comprehensive evaluation function by utilizing the determined data weights so as to execute rock mass evaluation of a corresponding evaluation interval by utilizing the comprehensive evaluation function; Otherwise, determining a rock mass quality evaluation rule to input surrounding rock quality evaluation index parameters of the same evaluation interval into a classification model trained based on the current historical data quantity of the surrounding rock of the target roadway to perform rock mass quality evaluation of the corresponding evaluation interval.
4. The method for analyzing the quality of the mined rock mass based on the in-situ pinhole detection as set forth in claim 3, wherein the step of determining the data weight of each surrounding rock mass evaluation index parameter located in different threshold ranges in the same evaluation interval by using a hierarchical analysis method includes: Sequencing all surrounding rock quality evaluation index parameters of the same type in the same evaluation interval according to the sequence from the large value to the small value, and dividing the sequenced all surrounding rock quality evaluation index parameters of the same type according to a plurality of preset threshold ranges to obtain all surrounding rock quality evaluation index parameters in all threshold ranges in the corresponding evaluation interval; And determining the data weight corresponding to each threshold range by adopting a hierarchical analysis method based on the difference between each threshold range in the same evaluation interval and the optimal threshold range and the worst threshold range, wherein the optimal threshold range is used for representing the threshold range of the surrounding rock quality evaluation index parameter with the best surrounding rock quality, and the worst threshold range is used for representing the threshold range of the surrounding rock quality evaluation index parameter with the worst surrounding rock quality.
5. The method for analyzing the quality of the mined rock mass based on the in-situ pinhole detection as set forth in claim 4, wherein the determining rules of the data weights corresponding to the threshold ranges include: assigning a highest score to the optimal threshold range and assigning a lowest score to the worst threshold range; the upper limit of each threshold range in the same evaluation interval is respectively compared with the upper limit of the optimal threshold range and the upper limit of the worst threshold range, and the score proportion of each threshold range is determined according to the comparison result; Weighting the difference value between the highest score and the lowest score by using the determined score proportion to obtain the score corresponding to each threshold range; based on the scores of the respective threshold ranges, data weights corresponding to the respective threshold ranges are constructed.
6. The method for analyzing the quality of the mined rock mass based on the in-situ pinhole detection as claimed in claim 3, wherein the surrounding rock mass evaluation index parameters at least comprise one or more of the number of cracks, the length of the cracks, the opening of the cracks and the strength of the surrounding rock; The data weight of the number of cracks is used for reflecting the rock mass integrity degree of surrounding rock; The data weight of the fracture length is used for reflecting the size of a potentially unstable block; the data weight of the fracture opening is used for reflecting the mechanical property and seepage capability of the fracture surface; the magnitude of the data weight of the surrounding rock strength is proportional to the rock mass integrity of the surrounding rock.
7. The method for analyzing the quality of the mined rock mass based on the in-situ pinhole detection as set forth in claim 1, wherein after obtaining the result of analyzing the quality of the mined rock mass of the target roadway surrounding rock, the method further comprises: And comparing the mining rock mass analysis result of the target roadway surrounding rock with the on-site actual situation so as to optimize the mining rock mass analysis result of the target roadway surrounding rock based on the comparison result.
8. A mining rock mass analysis system based on in-situ pinhole detection, comprising: The rock mass comprehensive index obtaining module is used for correspondingly executing rock mass quality evaluation of the target roadway surrounding rock based on crack development conditions and geomechanical parameters of the target roadway surrounding rock before/after the mining influence so as to obtain rock mass comprehensive indexes of the target roadway surrounding rock before/after the mining influence; The grade matching module is used for respectively matching the stability evaluation grade of the surrounding rock before mining, the stability evaluation grade of the surrounding rock after mining influence and the mining influence effect grade based on the obtained rock mass comprehensive indexes before/after mining influence and the change condition of the rock mass comprehensive indexes before/after mining influence; and the comprehensive analysis module is used for synthesizing the matching results of the levels to obtain the mining rock mass analysis result of the target roadway surrounding rock.
9. A machine-readable storage medium having instructions stored thereon, which when executed by a processor, cause the processor to be configured to perform the method of in situ pore detection based mined rock mass analysis of any of claims 1 to 7.
10. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method of in situ pore detection based mined rock mass analysis of any one of claims 1 to 7.

Description

Mining rock mass analysis method and system based on in-situ small hole detection Technical Field The invention relates to the technical field of rock mass analysis, in particular to a mining rock mass analysis method based on in-situ small hole detection, a mining rock mass analysis system based on in-situ small hole detection, a machine-readable storage medium and electronic equipment. Background The rock mass is a complex geologic body with a large number of randomly distributed structural planes, and the quality evaluation and classification are the basis of rock engineering design and are also important bases for predicting underground coal mine disasters. In the coal mining process, the stability of surrounding rock under the influence of mining is directly related to production safety and efficiency. The mechanical properties and structure of the mined rock mass are significantly degraded dynamically and spatially with mining activities as compared to the original rock mass. Therefore, the quality of the mining rock mass is accurately and quantitatively evaluated and classified, and the method is a key premise for realizing roadway support optimization, disaster early warning and safety production. Researchers have conducted a great deal of theoretical research and field practice on rock mass quality evaluation, and have proposed classical evaluation and classification methods such as "RQD" index, "RMR" index, and "Q" index according to different classification criteria. However, these methods mainly depend on the laboratory test results of the drilled core and static geological logging data, and although the methods are widely applied in engineering practice, the methods are static and empirical in nature, and are difficult to effectively capture the time-space evolution law of the rock strength and the crack development degree in the mining process. The methods are established for surrounding rocks and hard jointed rock bodies of shallow tunnels, have certain limitations in evaluating weak coal rock bodies with large burial depth, joint development and low strength, and are further complicated in crack and joint development in coal roadways due to the influence of mining activities, so that the conventional rock mass quality evaluation and classification method is not applicable to surrounding rock bodies of coal roadways. For coal mine roadways, most rock masses contain weak structural planes or interlayers, the strength of the coal masses is generally low, rocks with low strength are frequently encountered in coal-based strata, and the coal-based strata are not easy to prepare into test pieces. The best method is therefore to measure various mechanical indexes of the rock mass in situ to describe the mechanical properties of the rock mass more accurately. The drilling and shooting technology can directly observe the distribution of cracks on the wall of a drilling hole by means of an optical principle, has the advantages of simplicity and convenience in operation, high success rate and the like, and is widely applied to detection and evaluation of the quality of underground rock mass of a coal mine. However, the current research is mainly focused on the feasibility and accuracy of in-situ strength and drilling imaging technology test, but no specific evaluation criteria exists, so that the data obtained by the current in-situ test can only be qualitatively analyzed, but not quantitatively and quantitatively determined, so that the engineering requirements of engineering practice on dynamic, quantitative and fine evaluation of the mined rock mass cannot be met. In summary, the existing rock mass quality classification method is difficult to meet the engineering requirements of dynamic, quantitative and refined evaluation of the mined rock mass. Therefore, how to obtain the mechanical and structural parameters of the mining rock mass through in-situ small-aperture test and to realize the quantification and classification of the rock mass through the parameters has become an important technical problem to be solved in the field of mining engineering rock stratum control. Disclosure of Invention The embodiment of the invention aims to provide a mining rock mass analysis method and system based on in-situ small hole detection, so as to at least solve the problem of how to truly reflect the rock mass distribution characteristics after mining influence and guide the control of surrounding rocks of a roadway. In order to achieve the above object, a first aspect of the present invention provides a method for analyzing the quality of a mined rock mass based on in-situ pinhole detection, comprising: Correspondingly executing rock mass quality evaluation of the target roadway surrounding rock based on crack development conditions and geomechanical parameters of the target roadway surrounding rock before/after mining influence so as to obtain a rock mass comprehensive index of the target roadway surrounding r