... extraction non-return valve 抽汽逆止阀 extraction opening 抽汽口 extraction point 抽汽口，抽汽点 ...
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Due to the increase in access space, the stress concentration state of roadway is improved and the stability of extraction opening is increased.
大间距无底柱由于加大了进路间距，改善了巷道的应力集中状态，提高了回采巷道的稳定性。
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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