coal wall caving 煤壁片帮
wall caving prevention 巷壁崩落的预防
short wall caving mining 短壁崩落法
The following research results are obtained: the top coal caving technique and increasing the resistance of the support can reduce the pressure on the coal wall.
研究表明：放顶煤开采、提高支架工作阻力可以减缓煤壁压力，煤体合理注水可以提高煤体黏聚力与抗剪强度，它们是防治极软煤层煤壁片帮的有效措施。
During the drivage of main-gate in long-wall face with fully mechanized caving mining, the gate is hard to support due to its loose and broken roof, large cross-section and long span.
在综采放顶煤工作面顺槽掘进过程中，由于顺槽煤层顶板松动破碎，并且顺槽采用矩形断面，顶板跨距较大，不利于巷道支护。
The formation is unstable and the wall caving are severe.
地层不稳定，井壁垮塌严重。
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