孤岛综放面穿越顶分层煤柱区煤体应力变化规律

Study on the changing law of stress in coal pillar of top slice face passed by isolatedface adopted longwall with top-coal caving mining

巨厚砾岩下孤岛综放面穿越顶分层煤柱区时,随着工作面向前推移,煤柱上的支承压力越来越大,煤体失稳破坏的危险性也逐步加大。根据钻孔应力测试原理,采用钻孔应力计测试了煤体的应力,分析了煤柱区煤体应力的变化规律,确定了煤柱区煤体的危险程度;在此基础上给出了工作面矿压和上下巷变形控制的措施。

The abutment stress in coal pillars and the dangerous degree of the instability of coal body will be more and more serious when isolated face adopted longwall with top-coal caving passes coal pillars of top slice face under extra-thick conglomerate stratum. According to the theory of stress measure in drilling hole, the paper puts forward the roof pressure of working face and the measures to control the deformation in upper and lower roadways on the basis of the stress measuring of coal body and the analysis of the changing law of stress in coal pillar and the deciding of the dangerous degree.