Coal seam macroscopic fracture advantage development azimuth prediction method

Abstract

The invention discloses a coal seam macroscopic facture advantage development azimuth prediction method, and belongs to the technical field of the coal main security. The method comprises the following steps: step A, tracking advance of the mining working face, and performing facture photographing on the coal wall of the coal-mining working face and the coal wall of a transportation tunnel to acquire coal wall facture photos; B, processing the coal wall facture photos to highlight pixel display; C, importing the processed coal wall fracture photos into AutoCAD drawing software, and respectively measuring the coal wall facture trace dip information in the 0 to 90 DEG or 0 to -90 DEG according to preset reference azimuth angle; D, drawing the coal wall fracture trace dip angle rose pattern,and dividing the advantage development group; E, according to the advantage development group condition of the step D, predicting the possibly existent fracture face type of the coal seam space; F, establishing the fracture occurrence computation mathematic model according to the space relation between the coal wall of the coal-mining working face and the coal wall of the transportation tunnel; and G, selecting the underground representative coal wall fracture to measure, thereby providing theoretic reference for the coal seam efficient drainage design at a test area.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and in particular relates to a method for predicting the dominant development orientation of macroscopic cracks in coal seams. Background technique [0002] Coal seam fissures are divided into macroscopic fissures and microscopic fissures in scale. Macroscopic cracks directly lead to the anisotropy of coal seam permeability, resulting in the advantage of coal seam gas seepage, which is related to the underground coal seam gas drainage and the production efficiency of ground coal bed methane wells. According to the data of the US Bureau of Mines, due to the influence of the dominant development orientation of coal seam fractures, the ratio of coal seam permeability in different directions is as high as 17:1, and the difference in the amount of coalbed methane extraction is 3 to 10 times. The underground gas drainage test of Hanwang Coal Mine in Jiaozuo, my country shows that there are si...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a method for predicting the dominant development direction of coal seam macroscopic cracks in order to solve the difficult problem of coal seam macroscopic crack prediction technology existing in the above-mentioned prior art. The technical scheme adopted for achieving the above-mentioned purpose is:

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