长壁膏体充填开采覆岩运移特征及矿压显现规律研究

Study on overlying strata movement characteristics and strata behavior law in long wall paste filling mining

以古城煤矿1123充填工作面为研究对象,运用地质雷达、多点位移计、微震监测等方法研究深井长壁膏体充填开采覆岩运移特征及矿压显现规律。结果表明:(1)工作面超前采动影响距离为33~37 m,进风巷煤柱侧超前采动影响距离增至50 m,回风巷断层影响区超前采动影响距离呈现增长趋势;(2)充填工作面微震事件分布呈非对称、低能量、纵向发育高度小、底板集中、顶板分散等特征,以小能量事件居多;(3)充填工作面顶板以变形下沉为主,未发生大范围的破坏,说明充填开采可降低上覆岩层的运移模式和强度;(4)充填工作面推进到165.6 m时,地表未发生明显的沉降现象,表明充填开采对地表沉降具有较好抑制作用。

In order to reveal the characteristics of overlying rock migration and mining pressure manifestation in deep well long wall paste filling mining,the 1123 filling working face of Gucheng Coal Mine was taken as the research object,and geological radar,multi-point displacement meter,microseismic monitoring and other methods were used for research.The research results show that:(1)The range of influence of advanced mining in the working face is 33~37 m,and the range of influence of advanced mining on the coal pillar side of the intake roadway increases to 50 m.The range of influence of advanced mining in the fault affected area of the return airway shows an increasing trend;(2)The microseismic events in the filling working face exhibit distribution characteristics such as asymmetry,low energy,low vertical development height,concentrated bottom plate,and dispersed top plate,with a majority of small energy events;(3)The top plate of the filling working face is mainly deformed and sunk,without large-scale damage or major energy events,indicating that filling mining reduces the migration mode and strength of the overlying rock layers;(4)When the progress of filling the working face reached 165.6 meters,there was no significant subsidence on the surface,indicating that filling mining has a good inhibitory effect on surface subsidence.