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煤层瓦斯压力是评价一块煤层是否具有突出危险性的一个重要指标,但煤层瓦斯压力受不同的测定方法以及不同的地质条件影响,真实的煤层瓦斯压力很难得到有效的测定。利用穿层钻孔测定煤层瓦斯压力时,若岩层裂隙发育或封孔工艺落后,在实际测定中很容易导致钻孔内瓦斯大量溢出,这是造成压力显现失真的主要原因。
Gas pressure in coal seam is an important index to evaluate whether a coal seam has outstanding danger. However, the gas pressure in coal seam is affected by different measurement methods and different geological conditions, and the real coal seam gas pressure can hardly be effectively measured. When measuring the coal seam gas pressure by using the stratum penetrating borehole, if the rock fracture develops or the sealing process lags behind, it is easy to cause a large amount of gas in the borehole to overflow in the actual measurement, which is the main reason that causes the pressure to appear distorted.