采动过程中覆岩破碎区碎胀性走向分布特征

为了探究采动过程中覆岩破碎区碎胀性在走向分布规律,采用UDEC数值模拟及相似模拟手段分析了煤层顶板运移规律及碎胀系数分布特征。结果表明：随着采空区上覆岩层空间结构发展的演化,煤层顶板下沉量由下至上逐层降低,并最终趋于稳定；在工作面推进方向上,碎胀系数不断降低,且呈现出一定的分区特性,随回采呈现动态变化的周期性前移,其在走向上划分为三个区域,即：自然堆积区、载荷影响区、逐渐压实区。最后,确定浆体充填滞后距离为60m,现场试验邻位注浆充填效果良好。

Distribution characteristics of dilatancy in overburden fracture zone during mining

In order to explore the trend distribution law of the dilatancy in the fractured area of overburden during mining, the migration law of coal seam roof and the distribution characteristics of the dilatancy coefficient were analyzed by UDEC numerical simulation and similar simulation. The results show that with the evolution of the spatial structure of the overlying strata in the goaf, the subsidence of the coal seam roof decreases layer by layer from bottom to top, and finally tends to be stable. In the advancing direction of the working face, the coefficient of dilatancy decreases continuously, and presents certain zoning characteristics, showing a periodic forward movement of dynamic changes with the mining. It is divided into three areas in strike, namely natural accumulation area, load affected area and gradual compaction area. Finally, it is determined that the lag distance of slurry filling is 60m, and the effect of adjacent grouting filling is good in the field test.