The II3123 face is a light type caving face of three-soft coal seam. the roof is cracked, sloughing and roof fall often occur.

前言： 石台煤矿II3123工作面为“三软”煤层轻放工作面，顶板破碎易掉，片帮、冒顶时常发生。

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The sound emission characteristics and the causes for incorrect prediction of the stope roof fall at Tonglushan Mine were analysed.

对铜绿山矿采场冒顶的声发射特征和预报不准的原因进行了分析。

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Analysing the roof-fall cause of end face and support system, an effective way to reduce roof fall sensitivity and improving production efficiency are pointed out.

通过对工作面端面冒顶原因及支护系统的分析得出，加大液压支架的流量可以加快移架速度，降低冒顶事故率，提高生产效率。

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But it sure can dish up some compensating amusement while we wait for the roof to fall in.

FORBES: Chronicling The Decline And Fall Of Entitlement Democracy

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.

ECONOMIST: Green.view: Finger on the spot | The

Partly because of his stammer, brought on by a fall through a roof as a lad, and partly because people from Hesket didn't talk too much as a rule, he didn't care to meet strangers.

ECONOMIST: Edward Stobart