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如何提高低透气性煤层的预抽瓦斯效果,除了在工程上增加钻孔密度、延长抽放时间外,在技术上是一直难以得到解决的问题。瓦斯抽放技术参数的确定,将是瓦斯抽放技术方法选择的基础。本研究测定了瓦斯压力、煤层瓦斯含量、煤层透气性系数,通过计算获得了可采煤层、不可采煤层以及围岩中所赋存的瓦斯储量、可抽量,选择了合适的抽放方法,最终确定了抽放率、抽放负压、抽放时间等抽放参数,从而为瓦斯抽放技术方法的应用提供技术保障。
How to improve the pre-drainage gas effect of low permeability coal seam is technically a problem which has been hard to be solved except for increasing the drilling density and prolonging the drainage time in engineering. Determination of gas drainage technical parameters, gas drainage technology will be the basis of choice. In this study, gas pressure, coal seam gas content and coal seam gas permeability coefficient were measured. The gas reserves stored in the recoverable coal seam, non-recoverable coal seam and surrounding rock were obtained by calculation, Method, the drainage parameters such as drainage rate, suction negative pressure and drainage time are finally determined, so as to provide technical support for the application of gas drainage technology.