采高变化对覆岩移动变形的影响分析

Analysis on the Influence of Mining Height on the Movement Deformation of Overburden

以河南新登煤矿31071综采工作面为工程背景,建立覆岩移动变形的Flac3D数值模拟计算模型,研究开采不同采高条件下覆岩位移及应力的变形破坏情况。结果表明:上覆岩层的塌落带、裂隙带范围相应增大,且变化明显,同时,煤层顶板上方应力得以重新分布的距离随着采高增大也逐渐增加。

The Flac^3D of movement deformation of overburden rock is built, so as to do some relative research on the 31071 fully mechanized coal face of Henan Xindeng coal mine. The deformation and failure of the stress and displacement of strata under the condition of different mining height are studied in detail. The research findings show that, the overburden of caving zone, fracture zone increases accordingly, and the changes is obvious. At the same time, the distance of above the coal seam roof stress to redistribute also increased gradually with the increasing mining height.