Study on the Influence of Surface Drilling Extraction on Spontaneous Combustion Dangerous Area in Goaf
In order to study the influence of surface drilling extraction on the dangerous area of coal spontaneous combustion in goaf,taking the fully mechanized mining face of a mine as the research background,the beam tube monitoring system and SF6 tracer gas were used to measure the spontaneous combustion dangerous area of residual coal in goaf and the air leakage in goaf.The distribution of spontaneous combustion dangerous area in goaf with or without surface drilling and the influences of different extraction amounts of surface drilling on the distribution of oxygen ancentration in goal were studied by numerical simulation.The results show that the maximum width of the oxidation zone in the goaf is 72.2 m,and the minimum daily propulsion degree is 1.08 m.The ratio of the maximum concentration of SF6 measured by tracer gas between the wind tunnel measuring point and the ground drilling measuring point is 8∶1.The numerical simulation results show that the extraction of ground drilling is conductive to increasing the range of spontaneous combustion dangerous area in goaf,and the spontaneous combustion dangerous area expands with the increase of extraction amount.
万方数据
维普
