rock surrounding a coal roadway
rock surrounding a coal roadway
煤矿巷道周围的岩石
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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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