分层开采底板岩层移动的现场观测研究

煤层开采会诱发底板岩层的变形和破坏 ,由此导致许多煤矿灾害的发生 ,最引人注目的是底板承压水的突出。对于厚煤层分层开采 ,由于第二分层及以下各分层开采时工作面围岩应力场与第一分层时具有明显不同的特征 ,将导致煤层底板岩层移动呈现不同的规律。介绍了分层开采煤层底板岩层移动的观测方法 ,提供了试验观测数据 ,并给出了分层开采煤层底板岩层的移动变形规律。试验成果对防治底板承压水的突出具有较大的意义。

In situ measurement of floor strata displacements in slice mining

Coal mining induces deformation and failure of floor strata, which make many disasters take place. Among them, it is most serious that confined water in Ordovician limestone below coal seams floods into tunnels or working faces. For slice mining of thick coal seams, because the rock stress in the first slicing is different from that in the second slicing and below, this may induce different characteristics of strata displacements in slice mining. In this paper, authors introduce the method of measuring floor strata displacements in slice mining, present the experimental data, and finally, give the displacement laws of floor strata for slice mining. The results are of great significance for preventing floor water irruption.