Through analysis of lithologic character and composite structure of roof rock of No. 6 coal layer in Liuqiao Coal Mine, the stability of roof rock in different zones are assessed.
通过对刘桥矿区6煤层顶板岩层的岩性和岩性组合结构的分析，确定了不同区域的稳定性情况。
The coal seam roof of Huojitu mine is the burnt rock, which is the water impregnated aquifer, is dangerous to mine safety.
烧变岩是活鸡兔矿井的顶板充水含水层，直接威胁着矿井的生产安全。
To counter the effects of joints on the production of coal mine, the paper advances a new method to forecast the frequency of joints in coal bed and its roof.
针对节理对煤矿生产的影响。本文提出一种预测煤层及其顶板节理频率的新方法。
应用推荐