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为认清海孜煤矿Ⅱ101和Ⅲ101采区强矿震频发的成因,据以制定针对性的防治对策,应用震源机制解答方法,反演9个强矿震的采动岩体破裂机制,结合现场调查、地应力测量和震源定位数据分析,得出强矿震的发生机制为:1)强矿震岩体破裂应力场具有继承性,受矿区构造应力场的显著控制;2)Ⅱ101采空区强矿震的发生极活跃,是由于Ⅲ1012工作面开采,使得采空区悬顶总面积超临界平衡状态;3)导致顶板向下滑动势增大,沿原有断层滑动活化;4)造成煤柱区底板采动应力场与原岩应力场叠加过载,克服原有断层的摩擦阻力运动活化或产生新断层。防治对策为:控制采空区面积过大;Ⅱ101老空区局部填充;Ⅲ101新采区由无煤柱开采修改为条带煤柱开采方式。
In order to find out the cause of strong ore-bearing frequent earthquakes in Ⅱ101 and Ⅲ101 mining areas of Haizi Coal Mine, aiming at making countermeasures for prevention and control, a focal mechanism solution method was applied to inverse the fracture mechanism of the nine strong mining earthquakes, Field investigation, geostress measurement and source positioning data analysis show that the occurrence mechanism of strong mine shocks is as follows: 1) the fracture stress field of strong rock mass is inherited and controlled by the tectonic stress field; 2) The strong occurrence of strong earthquakes in the area is due to the mining of Ⅲ1012 working face, which makes the total area of the suspended roof in the goaf to be in a supercritical equilibrium state; 3) the slide-down of the roof increases and slides along the original faults; 4) The coal mining floor floor mining stress field superimposed with the original rock stress field overload, overcome the frictional resistance of the original fault movement activation or a new fault. Prevention and control measures are as follows: controlling the area of goaf area is too large; Ⅱ101 is partially filled with old space; Ⅲ101 new mining area is changed from non-coal pillar mining to strip coal pillar mining method.