Coal mine rock burst risk grading prediction method based on drilling cutting monitoring
A technology of rock burst and prediction method, which is applied in the fields of prediction, surface mining, mining equipment, etc., and can solve problems such as the inability to achieve quantitative prediction of impact risk classification and so on.
Inactive Publication Date: 2021-02-26
CHANGZHOU INST OF TECH
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[0004] In view of the above problems, the present invention provides a coal mine rockburst risk classification prediction method based on drill cuttings monitoring, which effectively solves the technical problem that the existing rockburst drilling cuttings monitoring method cannot realize the graded and quantitative prediction of rock burst risk. Construct pulverized coal supercritical index rate c i This new index realizes the graded and quantitative prediction of the risk of rock burst, in order to provide some reference for the prevention and control of rock burst in coal mines
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[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these drawings and obtain other implementations.
[0016] Such as figure 1 Shown is the coal mine rock burst risk classification prediction method based on drilling cuttings monitoring provided by the present invention. As can be seen from the figure, the coal mine rock burst risk classification prediction method includes:
[0017] S10 Arrange multiple cuttings holes in the normal stress area of the mining working face to be monitored, measure the amount of pulverized coal per meter of each cuttings hole and calculate the averag...
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The invention provides a coal mine rock burst risk grading prediction method based on drilling cutting monitoring, and the method comprises the steps: S10, arranging a plurality of drilling cutting holes in a normal stress region of a to-be-monitored excavation working surface, measuring the pulverized coal quantity per meter of each drilling cutting hole, calculating to obtain an average value ofthe pulverized coal quantity per meter, and taking the average value as the normal pulverized coal quantity M < normal i > per meter of the working surface drilling cutting hole; while recording possible dynamic phenomena and drilling depths S20, calculating according to the M normal i and the drilling powder rate index b for evaluating the impact risk of the working place to obtain the criticalcoal powder quantity M critical i of each meter of the drilling cutting hole; S30, in the normal excavation period of the excavation working face to be monitored, forming drilling cutting monitoring holes in the mining influence range of the working face, and measuring the actual coal dust amount M actual i per meter of the drilling cutting monitoring holes; S40, obtaining a supercritical index rate ci of each meter of pulverized coal based on the M critical i and the M actual i; and S50, comprehensively predicting the rock burst danger level of the mining working face according to ci and thedynamic phenomenon occurring in the drilling process, and simply, practically and quantitatively predicting the rock burst danger of the working face.
Description
technical field [0001] The invention relates to the technical field of coal mine mining and coal mine safety, in particular to a method for grading and predicting the risk of rock burst in coal mines. Background technique [0002] The drilling cuttings method is a method to predict the risk of rockburst based on the amount of pulverized coal discharged when drilling a hole (diameter 42-50mm) in the coal seam and the related dynamic effects. The theoretical basis of this method is that the amount of pulverized coal drilled has a positive correlation with the stress state of the coal body, that is, the greater the pulverized coal discharge per unit length, the higher the stress concentration and impact risk of the coal body. The drilling cuttings method has the advantages of simple equipment, intuitive detection results, and convenient on-site operation. It is still one of the most direct and effective methods for on-site rockburst prediction in coal mines. [0003] Based on ...
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IPC IPC(8): G06Q10/04G06Q10/06G06F17/18E21F17/18E21C41/18
CPCE21C41/18E21F17/18G06F17/18G06Q10/04G06Q10/0635G06Q10/06393
Inventor 王正义
Owner CHANGZHOU INST OF TECH