长壁逐巷胶结充填工作面关键参数设计

Design of Key Parameters of the Longwall-Roadway Cemented Filling Face

针对河南某矿老城区下压煤回采困难等问题,提出了应用长壁逐巷胶结充填采煤法回采老城区下煤炭资源。分析了充填工作面处于前、中、后3个充填时期的煤层-充填体相互作用状态,提出了胶结充填采煤工艺的3个关键参数;采用理论分析和数值模拟方法研究了充填工作面的应力分布及围岩变形特征;在数值模拟的基础上,建立了煤层-充填体控顶力学模型,得到了顶板下沉挠度曲线。研究表明:长壁逐巷胶结充填采煤的充填巷道宽度为5 m,间距为3倍掘巷宽度,充实率为90%时,能有效地避开上一条巷道开挖的应力增高区,顶板最终下沉位移为0.281 m,对顶板变形起到了良好的控制作用。

In view of the difficulties in the recovery of pressed coal in the old urban area of a coal mine in Henan Province,longwall-roadway cemented filling technology was proposed to recover the occupied resources in the old urban area.The interaction states of coal seam and filling body in the filling face in the first,middle and last filling periods were analyzed,and three key parameters of cemented filling mining technology were put forward.The stress distribution and surrounding rock deformation characteristics of the filling face were studied by means of theoretical analysis and numerical simulation.Then,the roof control mechanical model combining coal seam and filling body in the filling process was established on the basis of numerical simulation,and the roof subsidence deflection curve was obtained.The study shows that when the width of coal roadway in longwall-roadway cemented filling is 5 m,the distance is 3 times of the width of driving roadway,and the filling rate is 90%,the stress increase area of the previous roadway excavation can be effectively avoided.The final subsidence displacement of the roof is 0.281 m,with a good effect in controlling the roof deformation.