Coal seam macroscopic fracture dominant development orientation prediction method

Abstract

The invention belongs to the technical field of coal seam macroscopic fracture prediction, and particularly relates to a coal seam macroscopic fracture dominant development orientation prediction method, which comprises the steps of 1, selecting a coal wall picture, processing an original coal wall image by adopting different gray thresholds, taking white as an area with a gray value smaller thanq, and taking black as other parts; 2, carrying out information input and output, including single fracture picture input, multiple fracture picture input and fracture information output; 3, preprocessing the image, wherein as the underground shooting condition is limited, crack pictures often have poor definition and are reasonable in structure, and noise reduction processing, binarization optimization, image edge detection and the like can be automatically carried out on the preprocessed pictures, so that the digital pictures reach the actual application standard, the tedious workload of workers can be greatly reduced, and the efficiency and accuracy of field recognition are improved.

Description

technical field [0001] The invention relates to the technical field of coal seam macroscopic fissures, in particular to a method for predicting the dominant development orientation of coal seam macroscopic fissures. Background technique [0002] People have a long history of research on coal seam macro-fractures. It has been found that in the same geological unit, the development of coal seam macro-fractures has a certain statistical law; coal seam fractures can directly lead to coal seam permeability anisotropy. According to the data of the US Bureau of Mines, due to the influence 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. Underground gas drainage tests in coal mines in my country have shown that there are significant differences in the gas extraction efficiency of gas drainage boreholes in different directions in the same coal seam. ...

AI Technical Summary

Problems solved by technology

However, the traditional method of measuring coal seam fractures with the help of compass and other tools is laborious and time-consuming, and it is difficult to effectively observe the coal seam macroscopic fractures and obtain the important development orientation of coal seam macroscopic fractures due to the limitation of underground space or magnetic field interference. As a result, the current gas drainage engineering design of coal mines in my country does not take into account the influence of the development characteristics of macroscopic cracks in coal seams on the drainage efficiency.

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