薄煤层采煤工作面顶板穿层钻孔瓦斯抽采试验研究

Experimental study on roof-crossing borehole gas drainage method in thin coal seams with long wall coalface

以凤凰煤矿1402采煤工作面为工程应用背景,针对煤层薄、瓦斯含量高、透气性差、地质条件差的特点,运用岩层移动理论,研究了采煤工作面采空区大流量、高浓度卸压瓦斯的运移路径和富集区域;借鉴了邻近煤矿瓦斯抽采经验,选择顶板穿层钻孔瓦斯抽采方法作为主要矿井瓦斯抽采方法之一,试验了该方法的合理瓦斯抽采参数;提高了采煤工作面瓦斯抽采率,消除了采煤工作面瓦斯积聚现象。

Based on the characteristics of highly gassy thin seam and poor gas permeability in Feng Huang Coalmine 1402 coalface, the migration paths and abundant region of pressure-relieved gas with large-flow and high-concentra- tion in gob were studied by means of strata displacement theory as well as gas movement regularity of gob. Experi-ence of adjacent coal was chosen as one of mines gas drainage method was used for reference, the roof-crossing borehole drainage method main gas drainage methods. The gas drainage parameters were designed and successfully test- ed. The gas drainage efficiency was improved, and the phenomenon of gas-over-limit was eliminated. The roof- crossing borehole drainage method was suitable in Feng Huang coalmine.