汪家寨煤矿煤与瓦斯突出规律及其主控因素分析

汪家寨煤矿是严重的煤与瓦斯突出矿井,依据矿区实际瓦斯地质资料,运用瓦斯地质理论和构造演化理论,研究了区域和井田构造控制特征。分析认为该矿主要以中小型突出、倾出为主,压出为辅;随煤层埋深的增加突出强度增大;C409煤突出最为严重;突出多发生在煤巷掘进面及断层影响带。分析了埋藏深度、顶底板岩性、煤厚及其变化、软分层、地质构造等因素对煤矿煤与瓦斯突出的影响,认为断层及其影响带、厚煤尤其是其增厚部位是煤与瓦斯突出的易发区域,因此断层构造和煤层厚度及其变化控制着该矿突出的发生和分布规律,为煤与瓦斯突出的主控因素。研究成果为矿井突出防治工作提供了理论指导。

Coal and Gas Outburst Pattern and Main Controlling Factor Analysis in Wangjiazhai Coalmine

The Wangjiazhai coalmine is a high coal and gas outburst hazardous mine.Using gas geological theory and tectonic evolution theory,the paper has studied regional and minefield structural control characteristics.The analysis considered that： the hazards are mainly medium to small outbursts and dumping out,while pressing out subsidiary;outburst intensity increasing along with coal buried depth increasing;outburst hazard of coal C409 is most serious;most outbursts happen in coal road heading faces and fault impacted zones.After analyzed impacts from coal buried depth,roof and floor lithology,thickness and its variation,soft slices,geological structures on coal and gas outburst,have considered that fault and its impact zone,thick coal especially its thickening position are susceptible area of outbursts.Thus fault structure and coal thickness and its variation have controlled outburst happening and distribution and the main controlling factors.The result has provided theoretic guidance for coalmine coal and gas outburst controlling works.