Cause analysis and prevention of spontaneous combustion in deep coal seam drilling

doi:10.16265/j.cnki.issn1003-3033.2019.01.007

Abstract

Abstract: To avoid spontaneous combustion of extraction boreholes in deep coal seam, the drilling of 24100 working face of Pingmei No. 10 coal mine was taken as the research object, the causes of spontaneous combustion of extraction boreholes were studied by means of theoretical calculation and numerical simulation. The radii of both fracture zone and plastic zone around the plugging section of the extraction borehole were determined by means of theoretical analysis. Based on the numerical simulation method, the sealing depth and suction negative pressure of the gas drainage hole of 24100 working face were optimized according to the minimum wind speed of spontaneous combustion of coal. The results were verified with the engineering experiment in 24100 working face. The results show that the radius of plastic zone around the plugging section of borehole is 0.22 m, which provides a leak passage for the extraction borehole, and that the optimum sealing depth of the extraction borehole in 24100 working face is 17 m and the negative pressure of the extraction is 25 kPa, which can prevent the spontaneous combustion of the extraction borehole.

Key words: spontaneous combustion of extraction boreholes, minimum ignition wind velocity, stress distribution, numerical simulation, sealing depth, vacuum

CLC Number:

X936

QI Qingjie, ZHAO Youxin, JIA Xinlei, ZHOU Xinhua. Cause analysis and prevention of spontaneous combustion in deep coal seam drilling[J]. China Safety Science Journal, 2019, 29(1): 37-42.

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