Some mining families resorted to scavenging for coal on slag heaps, a desperate move as most of the "slag" was very dangerous and liable to tip.
一些矿工家庭靠捡矿渣堆中的煤块解燃眉之急，这是一个绝望之举，因为大多数“矿渣”十分危险，极易倒塌。
The formation of thin coal shell that is formed by aerofoil cracks engendered at the tip of primary cracks in the entry's surrounding coal is analysed.
分析了平巷煤壁中预存裂纹尖端产生翼型张裂纹，形成薄煤层壳，薄煤层壳弯曲变形失稳引发冲击地压的机理。
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