Gas, water, fire, dust, coal mine roof five kinds of typical accident fault tree diagram have been given by use of systems analysis from human, machine, environment, and management four elements.
运用系统分析方法从人、机、环境、管理四个要素出发给出瓦斯、水、火、煤尘、顶板五种煤矿典型事故的事故树图。
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。
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