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为探究重复采动条件下断层滑移特征及其与冲击地压的关系,以老虎台矿83003综放工作面为研究对象,采用数值计算、现场监测和理论分析多种方法进行研究。采用UDEC数值模拟软件和预应力锚索的工作阻力监测,对重复采动条件下断层运动特征以及断层运动与冲击地压或矿震关系进行分析。研究表明,重复采动使断层活化,83003综放工作面开采后F25断层上盘的滑移量达到5~8 m;锚索工作阻力突变值大于5 k N时,将在33 h内发生能量较大(大于106J)的矿震,对冲击地压的发生具有预警作用。覆岩破坏、断层滑移、断层应力场和采动应力场耦合作用是83003综放工作面冲击地压频繁发生的根源。
In order to explore the characteristics of fault slip under repeated mining conditions and its relationship with rockburst, taking the 83003 fully mechanized coal caving face in Laohutai Mine as the research object, numerical methods, on-site monitoring and theoretical analysis were used to study the relationship. UDEC numerical simulation software and prestressed anchor cable work resistance monitoring are used to analyze the fault movement characteristics and the relationship between fault movement and rockburst or mining under repeated mining conditions. The research shows that the repeated mining can activate the fault, and the slip of the F25 fault upper plate after the mining of 83003 fully mechanized top coal caving face reaches 5 ~ 8 m. When the working resistance of anchor rope is greater than 5 kN, the energy will be generated within 33 h Larger (greater than 106J) mine shocks have an early warning effect on the occurrence of rock burst. The coupling of overlying rock failure, fault slip, fault stress field and mining stress field is the root cause of rockburst in 83003 fully mechanized caving mining face.