一、前言从名字上,我们就知道“预排”是一种采前抽放瓦斯的工艺(特别是煤层瓦斯排放),这是指在自然岩压和原始瓦斯含量的条件下进行的瓦斯排放。瓦斯排放的目的是降低煤层的原始瓦斯含量,以减小采煤过程中的瓦斯威胁,因此,预排瓦斯成了非常重要的问题。为了降 First, the preface From the name, we know that “pre-Pai” is a pre-mining gas drainage process (especially coal seam gas emissions), which refers to the natural rock pressure and the original gas content under the conditions of gas emissions . The purpose of gas emission is to reduce the original gas content of the coal seam so as to reduce the gas threat during coal mining. Therefore, pre-drainage gas is a very important issue. To drop