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| 11. | Looking through an accident from rock roof falling this paper puts forward the importancc and necessity |
| 现针对一起岩巷冒顶事故分析，提出加强施工技术管理的重要性和必要性。 |
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| 12. | Collapses in Mengshan area are caused by the weightless rock mass falling down rapidly due to the interaction |
| 崩塌是在陡崖或坡度陡峻的斜坡地带因岩体节理裂隙发育，受冻融、雨水等风化作用和重力作用，造成岩体失稳快速下落的现象。 |
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