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从开采煤层钻孔中涌出沼气与煤层的瓦斯含量、温度、煤层的透气性及随深度而变化的围岩应力有关。众所周知,温度和煤层中的瓦斯含量增加会导致沼气涌出量增大,而岩体应力增高,一方面会降低煤层的透气性,另一方面也能加速钻孔附近的煤层卸压,并加大瓦斯涌出。从实践中可知,重要的是要知道上述诸
Gas emission from the drilling of coal seams is related to the gas content, temperature, permeability of the coal seam and the surrounding rock stress that varies with depth. It is well-known that the increase of temperature and methane content in coal seam will lead to the increase of methane emission, while the stress of rock mass will increase. On the one hand, it will reduce the permeability of coal seam and on the other hand it can also accelerate the pressure relief of coal seam near borehole Large gas emission. From practice, it is important to know the above