控制工作面基本顶岩层稳定的临界充填高度

Critical Filling Height for Stability Controlling of Basic Roof Rock Stratum at Working Face

充填法处理采空区是实现绿色环保开采的有效措施。以冀中能源股份有限公司邢东矿充填开采工作面为背景,利用弹性理论及建立的"充填体-碎胀直接顶联合作用模型"计算控制基本顶岩层稳定的临界充填高度。用得到的临界充填高度指导邢东矿1126充填工作面充填工作,并实时监测1126工作面巷道顶板下沉量、巷道底鼓量及地面下沉量。结果表明:邢东矿主采2#煤层平均采高4.5m的条件下,工作面基本顶及以上岩层不发生断裂(地面不产生大的沉降变形)的临界充填高度在3.7m左右;1126工作面实际充填高度4m,其巷道顶板下沉量及底鼓量不大,上覆岩层未产生明显垮落,整个移动过程以缓慢下沉方式完成;地面沉降控制较好,最大下沉量仅20mm,对地面建筑结构影响小,达到了以填开采的目的。

Disposing goafs with fillings is an effective measure to realize the green mining with environmental protection.Against the filling mining working face in JZEG Xingdong mine,this paper calculates the critical filling height for controlling the stability of basic roof rock stratum applying the elastic theory and the combined effect model of filling mass-immediate roof after broken expanding.Filling work at the 1 1 2 6 working face in Xingdong mine was guided by the critical filling height,and roof subsidence and floor heave of coal roadway,ground subsidence of the working face were monitored in real time.The results indicate that under the condition of 2# coal seam in Xingdong mine whose average mining height is 4.5 m,the critical filling height is 3 .7 m,which prevents the working face roof and the strata above from breaking （the ground would not largely deform）;and that the actual filling height at the 1126 working face was 4 m,in which case the roof subsidence and floor heave of coal roadway were not large,obvious caving of the overlying strata did not occur.The whole mobile process of overlying strata was completed in a slowly sinking way.Ground subsidence was well controlled,with the largest surface subsidence less than 0mm,which had a slight influence on ground architectural structure.