The opening stability in soft weak coal layer is important to the safe production in a mine.

软弱煤层巷道的稳定性对煤矿正常安全生产起着重要作用。

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The time to produce damage deformation in surrounding rock and possible loosening area are obtained by analyzing in situ measurement of displacement in soft weak coal layer.

本文通过对软弱煤层巷道进行位移实测及数据分析，得到了西部某矿软弱煤层巷道围岩变形达破坏所需的时间和可能的变形松动区域。

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The surrounding rock of roadway is a compound structure consisted of roof, floor and sides. The sides of extraction opening are the weak coal mass, which affect the stability of floor directly.

巷道围岩是由顶板、底板、两帮组成的复合结构体，回采巷道两帮为软弱煤体，直接影响到底板的稳定性。

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CSX, the large railroad transportation company, posted first quarter earnings after the bell on Tuesday, beating profit and revenue estimates despite a weak coal market.

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The primary factor in the decline in stock price for the two firms was the weak demand for coal freight services, a trend which will affect CSX in Q4 2012 and will likely to do so over the next few quarters.

FORBES: CSX Earnings Preview: Modest Growth Expected

American demand for this type of metallurgical coal has been relatively weak recently, says Macquarie analyst Curt Woodworth.

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