该措施不仅保证了综采工作面支架安全、快速回收，而且还大幅度降低了撤面的费用。

This measure can not only ensure the safe and rapid withdrawal of powered support from the face, but also largely reduce the removal cost of the face.

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依据浅埋煤层矿压显现特征，给出浅埋煤层长壁开采工作面支架合理工作阻力及安全界限的确定方法。

Base on the weighing feature of the shallow coal bed, the specifying method of the support working resistance and safety margin is presented in the shallow coal bed.

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论述了顶煤介质状态转化对工作面支架的作用，不同强度顶煤在工作面控顶区上方的性态分布和放顶煤线处的垮落特点；

The loading affection on supports in process of transformation. the roof coal behaviour on the face zone and its caving character at cavity edge are expounded.

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