roof fall

基本解釋

Thin rock strata of roof fall by full thick, procreant cranny reach the earth's surface and have clearly sidesteppedsubsidence.
在回采過(guò)程中，工作面礦壓顯現(xiàn)比較明顯，頂板基巖沿全厚切落，產(chǎn)生的裂隙通達(dá)地表并有明顯的臺(tái)階下沉。
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.
高寶山金礦礦區(qū)地質(zhì)復(fù)雜，原有淺孔留礦法在生產(chǎn)中存在較多問(wèn)題，特別是頂板塌落。
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.
針對(duì)長(zhǎng)壁工作面頂板垮落具有局部、分段、遷移的時(shí)空特征，將長(zhǎng)壁工作面采場(chǎng)頂板劃分成若干個(gè)相互鉸接的薄板，建立了薄板組力學(xué)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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