厚松散层及超薄覆岩条件下放顶煤开采防砂煤柱

Study of mining the safety pillar against sand by caving method under conditions of thick ravelly ground and super thin capping rock

为解放厚松散层及超薄覆岩条件下防砂煤柱储量 ,在掌握三隔、四含水文工程地质条件基础上 ,通过井下疏放四含水、合理确定允许放采比以及控制工作面两端覆岩剪切破坏 ,有效实践了“破坏四含、保护三含”的思路。项目自实施以来 ,已成功回采了 4 0多万t煤炭 ,直接经济效益 4 0 0 0多万元。

In order to mine the safety pillar against sand under the conditions of the thick ravelly ground and the superthin capping rock,we put into an effect idea of breaking the fourth aquifer and protecting the third aquifer of the Quaternary system on the basis of the hydrogeologic conditions of the third aquifuge and the fourth aquifer by means of mine dewatering from the fourth aquifer,reasonably determining the ratio of the caving height and the mining height and preventing the shearing break in the capping rock over the working face to control the roof stability effectively.The coal more than 4×10 5 t have been mined successfully since the study of the question,the profit of which is about 40 million Yuan.