The compound roof fall accident of the individual hydraulic prop face is analyzed. The accident mechanization and prevention method are pointed.

对单体支柱工作面复合型顶板推垮型事故进行了分析，提出了事故发生的机理和预防办法。

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A roof fall accident that was caused by bolt support is analyzed. The influence of the lane fault to bolt (cable) is pointed out. It has a certain reference for support selection of the same lanes.

对锚杆支护引起的一起冒顶事故进行了分析，指出了顺巷断层对锚杆(索)支护的影响，对同类巷道的支护选择具有一定的借鉴意义。

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Roof fall accident is one kind of dangerous accidents happened at underground mines and underground pressure management is the main task of mining safety management.

冒顶片帮事故是地下矿山危害最为严重的事故，矿山地压管理是地下开采矿山安全管理的重要任务。

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