综采工作面分段充填过空巷技术研究

Research on Technology of Segmented Filling of Empty Roadway in Fully Mechanized Coal Mining Face

针对益东矿1107工作面过前方空巷问题,建立了空巷基本顶失稳力学模型,分析了过空巷基本顶失稳机理,确定了保持空巷围岩稳定条件下所需临界支护阻力。基于高水速凝材料承压特性,提出分段阻隔充填空巷,避免回采时受顶板下沉而出现压架现象;使用FLAC^(3D)分析空巷差异化充填宽度时其周围应力及位移分布状态,确定保持空巷围岩稳定时的合理宽度。结果表明:控制空巷基本顶不失稳的支护阻力需高于4.63 MPa;分段充填改善超前支承压力对工作面顶板和空巷围岩的影响,支架压力增幅仅为9.3%;回采过空巷时,顶板下沉量仅为163 mm,小于支架可伸缩量,未出现压架现象,保证了工作面顺利开采。

Based on the background of 1107 working face passing through an empty roadway ahead in Yidong coal mine,the mechanical model of the instability of the basic roof of the empty roadway is established,the instability mechanism of the basic roof of the empty roadway is analyzed,and the critical support resistance required under the condition of maintaining the stability of the surrounding rock of the empty roadway is determined.Based on the pressure bearing characteristics of high water quick setting material,put forward the sublevel barrier filling empty roadway to avoid the phenomenon of frame crushing caused by roof subsidence during mining;FLAC^(3D) is used to analyze the distribution of stress and displacement around the roadway with different filling width,so as to determine the reasonable width to maintain the stability of surrounding rock.The results show that the support resistance to control the instability of the basic roof of the goaf should be higher than 4.63 MPa;segmented filling can improve the influence of advance abutment pressure on the roof and surrounding rock of the working face,and the increase of support pressure is only 9.3%;when the stope passes through the empty roadway,the roof subsidence is only 163 mm,which is less than the telescopic amount of the support,and there is no support crushing phenomenon,which ensures the orderly mining of the working face.