论文部分内容阅读
瓦斯在煤层中的含量各不相同,其在煤层中含量的百分比跟成煤的地质条件,主要是与煤层上覆和下伏岩层的透气性相关。煤层被透气性很低的岩层包围,煤层中的瓦斯放散不出去,瓦斯含量就高,反之,瓦斯含量就低。在接近煤层露头和埋藏较浅的煤层中,瓦斯含量相对较低。随着煤层埋藏深度增加,瓦斯压力和含量按照瓦斯压力梯度参数相应增加。根据矿井开采先上后下、由浅至深的开采顺序,我国煤矿瓦斯事故防治的压力将越来越大。
The content of gas in the coal seam varies. The percentage of gas in the coal seam is related to the geological conditions of the coal, mainly related to the permeability of coal seam overlying and underlying rock formations. The coal seam is surrounded by rock formations with very low gas permeability. The gas in the coal seam can not be discharged and the gas content is high. On the contrary, the gas content is low. Near the coal outcrop and buried shallow coal seam, the gas content is relatively low. As the burial depth of the coal seam increases, the gas pressure and content increase correspondingly with the gas pressure gradient parameters. According to mine mining first and last, mining order from shallow to deep, China’s coal mine gas accident prevention and control pressure will be more and more.