We also introduced statistical way to analyze the strata in the initial roof caving and carried out reasonable classification.

采用统计学的方法进行了矿压分析和总结，根据初次放顶顶板情况进行了合理分类。

youdao

The deformation characters of the broken rocks are the important factors that affect the roof caving and surface subsidence above goaf in coal mining.

破碎岩石的变形性质是影响采空区覆岩垮落与地表沉陷的重要因素。

youdao

This paper introduces the design of light-duty roof caving coal hydraulic support equipped with flat tramcar and transportation on ground and under ground.

介绍轻型放顶煤液压支架(下文简称轻放支架)配套平板车的设计过程及轻放支架在煤矿地面、井下的运输过程。

youdao

There will be much negotiation to be done to stop the roof caving in on West Ham's plans but it would be hard to find more enthusiastic bidders as the process continues until a final shortlist is drawn up in March or April of 2011.

BBC: West Ham's grounds for optimism over Olympic Stadium

Now, I say all this not to re-litigate the past, but it's simply to state that the component parts of the Recovery Act are consistent with what many of you say are important things to do -- rebuilding our infrastructure, tax cuts for families and businesses, and making sure that we were providing states and individuals some support when the roof was caving in.

WHITEHOUSE: President Obama Takes Questions at GOP House Issues Conference | The White House

Thamrin Sihite, director general of minerals and coal at the Indonesian energy ministry, said workers were in the underground training room when the roof collapsed, caving in most of the room.

WSJ: Indonesian Mine Death Toll Rises, Miners Still Trapped