复杂地质高强度开采工作面矿压规律研究

Study on the Law of Ore Pressure in Complex Geological High-intensity Mining Face

工作面开采强度过高易诱发冲击地压等动力灾害,严重影响矿井安全生产。以余吾煤业N2105工作面为研究对象,采用理论分析及现场工业性试验相结合的综合分析方法,分析了复杂地质条件高强度开采工作面矿压规律,探究了特殊地质构造下的应力演化和微震分布特征。研究结果表明:(1)N2105工作面的顶板结构属于“悬臂梁”的结构类型,地质构造、开采深度、煤柱宽度以及瓦斯效应都是影响冲击地压发生的重要因素;(2)采空区侧向支承压力随工作面推进而增加,当滞后距离达到300 m时,应力变化趋于稳定;(3)微震事件主要分布在采空区边缘煤层,且工作面前方微震事件多于后方。

The high mining strength of the working face is easy to induce dynamic disasters such as rock burst,which seriously affects the safe production of the mine.Taking the N2105 working face of Yuwu Mining Industry as the research object,this paper analyzes the ore pressure law of the working face with high intensity under complex geological conditions and explores the stress evolution and micro-seismic distribution characteristics under special geological structure by using the comprehensive analysis method combining theoretical analysis and field industrial test.The results show that:①the roof structure of N2105 working face belongs to the structure type of"can-tilever beam",and the geological structure,mining depth,coal pillar width and gas effect are all important factors affecting the occur-rence of rock burst;②the lateral abutment pressure in the goaf increases with the advance of the working face,and when the lag dis-tance reaches 300 m,the stress changes tend to be stable;③microseismic events are mainly distributed in the coal seam at the edge of the goaf,and there are more microseismic events in front of the working face than behind it.