控制顶板事故，防范冲击矿压的发生是开采埋深较大的孤岛煤柱工作面的重点和难点。
Controlling roof accidents and preventing the occurrence of bursting underground pressure are the priorities and difficulties to mine deeper isolated pillar face.
瓦斯含量与煤层埋深、煤层顶板泥岩厚度、煤厚呈正相关关系。
Gas content varies as depth of burial, the thickness of roof clay rocks, and working thickness.
结果表明，使用该方法可以很好地控制浅埋深难垮顶板。
The results show that the methods mentioned in this paper could be adopted to control the roof strata properly in certain case.
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