平煤十一矿艾山逆断层瓦斯异常区范围划定研究

Delineation of Gas Abnormal Area of Aishan Reverse Fault of Pingmei No.11 Mine

以平煤十一矿中型艾山逆断层为例,研究断层周围的应力场分布、伴生构造的发育程度、瓦斯异常分布等,确定断层带瓦斯异常区的范围,为防治瓦斯措施提供基础数据。结果表明:艾山逆断层上盘是主动盘,受到的剪切作用强,煤体的破碎程度、瓦斯富集程度都优于下盘;断层尖灭端受相邻断层扰动影响形成应力异常集中区,尖灭端60 m内为瓦斯异常区,大于断层其他部位控制区,断层带瓦斯异常区范围的划定提高了采区工作面防突预测效率。

This paper takes the middle Aishan reverse fault of Pingdingshan No.11 Mine as an example, and studies the aspects of ground stress distribution in range of fault, structure coal development and gas abnormal distribution, and determines the scope of the gas anomaly zones in fault zone, then to provide basic data for prevention and control measures of gas. The results show that the hanging wall of Aishan fault is the active plate which is sheared and damaged seriously, the breaking degree of coal and gas enrichment degree are better than the footwall; the fault pinchout end is impacted by the disturbance of adjacent faults and forms an abnormal stress concentration area, the gas within 60 m of the abnormal area is greater than the control area of other parts of fault. The delineation of gas abnormal area in fault zone improves the prediction efficiency of outburst prevention in working face of mining area.