The main causes of shaft wall fracture contain the reverse friction force and the temperature stress.

分析研究表明导致立井壁破坏的主要原因是井壁负摩擦力和温度应力。

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The obtained results can be applied to the design of shaft in mine and the identification of fracture accident of shaft wall.

所得结果不仅可用于煤矿立井井壁的设计，而且还可用于立井井壁破裂原因的分析及相应事故的鉴定。

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It has some real meaning for stress calculating and fractures zone forecasting on shaft wall in drainage settlement coal field.

该模型的建立将对疏水沉降矿区井壁的受力计算和井壁破裂预测具有现实的意义。

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If you're caught you will get sent to D-Block solitary, a tiny cube where days are marked by a light shaft travelling across the wall - or you might be interrogated using techniques only alluded to in the otherwise thorough Alcatraz audio tour, with first-hand accounts by prison guards and prisoners of the Rock.

BBC: A tour of San Francisco��s Alcatraz

He also plans to transform the 28m-long ventilation shaft into a subterranean climbing wall.

BBC: Reawakening the Underground

If we managed to dig a several hundred foot vertical shaft and the soil was feeling generous, not collapsing inward and waiting for us to build the wall, the challenge of casting this concrete would still be great.

FORBES: Why Can't We Start Building The World's Deepest Building?