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为解决下沟煤矿ZF301工作面切眼瓦斯异常涌出的问题,通过采用瓦斯地质理论对瓦斯异常涌出现象的原因进行研究,推断因切眼附近断层的存在,该区域煤层裂隙发育,煤体孔隙率增大,大量游离瓦斯储存在裂隙中,形成了瓦斯富集区;由于受到切眼掘进活动的扰动,煤柱侧煤壁产生了裂隙并与瓦斯富集区沟通,因受到通风方式等采掘技术因素的影响,其内的游离瓦斯经裂隙集中释放到巷道内,造成切眼瓦斯涌出异常。据此从地质因素和采掘技术因素2个方面分析了切眼瓦斯涌出异常的原因,并有针对性的提出了采用煤壁封堵与瓦斯抽采相结合的防治措施。
In order to solve the problem of abnormal gas gushing through the face of ZF301 working face in Xiagou coal mine, the reason of abnormal gas gushing through gas geological theory is studied. It is deduced that the fractures of coal seams in this area are developed due to the presence of fault near the cut eye, A large amount of free gas is stored in the fractures and a gas-rich area is formed. Due to the disturbances caused by cutting activities in the cut eye, fissures are generated on the coal wall on the coal pillar and communicate with the gas-enriched area. Due to the ventilation method and the like Mining technology factors, the free gas within the fissure concentrated release into the roadway, resulting in cut eye gas emission anomaly. Based on the above analysis, the causes of abnormal gas emission from cut-off gas are analyzed from two aspects of geological factors and mining technology, and the prevention and control measures combining coal wall sealing with gas drainage are put forward in a targeted way.