roof fall

基本解释

Thin rock strata of roof fall by full thick, procreant cranny reach the earth's surface and have clearly sidesteppedsubsidence.
在回采过程中，工作面矿压显现比较明显，顶板基岩沿全厚切落，产生的裂隙通达地表并有明显的台阶下沉。
Many problems existed when the original shallow hole shrinkage method was used in Gaobaoshan Gold Mine, roof fall in particular, because of the complex geology of its mining area.
高宝山金矿矿区地质复杂，原有浅孔留矿法在生产中存在较多问题，特别是顶板塌落。
Based on the local, migratory and subsection characteristics of main roof fall of longwall face, the main roof was divided into some plate group, and plate group mechanical model was established.
针对长壁工作面顶板垮落具有局部、分段、迁移的时空特征，将长壁工作面采场顶板划分成若干个相互铰接的薄板，建立了薄板组力学模型。

But it sure can dish up some compensating amusement while we wait for the roof to fall in.
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Biologists are still running modelling experiments to determine whether to save the Wedgwood or leaded crystal as the house smoulders and timbers fall from the roof.
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