Fracture evolution characteristics of overburden rock on fully mechanized mining face under different advancing speeds
In order to study the evolution law of gas transportation and storage area under different advancing speeds on fully mechanized mining face,3DEC simulation software was used to simulate and analyze the evolution law of fractal dimension of mining overburden fracture under different advancing speeds.Based on the fractal dimension,the pressure relief gas trans-portation and storage area was identified and divided,and the distribution and evolution law of pressure relief gas transporta-tion and storage area under different advancing speeds were obtained.The on-site high-level extraction drilling is optimized.The results show that the fractal dimension of overburden fracture on fully mechanized mining face decreases with the in-crease of advancing speed.According to the research results,the pressure relief gas drainage boreholes on the test face are optimized.During the coal seam mining,the maximum gas volume fraction of the extraction boreholes in the high and low ad-vancing speed areas of the test working face is over 30％.The gas volume fractions of the working face,the return airway and the upper corner are 0.18％～0.46％,0.2％～0.46％and 0.25％～0.84％,respectively,which are below 1％,indica-ting that the layout method is more reasonable.
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