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煤层透气性的好坏是判断煤层抽放与突出可能性的重要指标之一,过去曾介绍过一些现场与实验室的测定方法(详见《煤矿抽放瓦斯》一书),但因其操作复杂,计算困难,至今未在全国推广使用。本文介绍两种苏联使用的方法,结合我国的情况,提出利用测压钻孔瓦斯压力上升与时间的关系,计算煤层透气性的方法,其中有些操作将比原文有所改进。
The permeability of the coal seam is one of the important indexes to judge the possibility of gas drainage and prominence. Some field and laboratory methods have been introduced in the past (for details, see “Coal Mine Methane Drainage”), but because of its operation Complex, computational difficulties, so far not to promote the use of the country. This article introduces two methods used by the Soviet Union. Based on the situation in China, this paper proposes a method to calculate the gas permeability of coal seam by using the relationship between pressure rise of pressure borehole and time, some of which will be improved compared with the original text.