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在高沼气厚煤层分层同采无煤柱开采中,顶分层采场沼气涌出量,往往占同区段煤层沼气含量的40~60%.其中来自采空区沼气涌出量又占项分层沼气涌出量的60~65%,且所占百分比随着煤层开采深度的增加而增大.尤其,在与同区段邻近煤层或次分层同采时,易引起项分层采空区沼气经尾巷大量涌出,造成区段轨道巷沼气含量超限,(最高达1.80~2.50%),严重影响了采区一翼采、掘工作面的正常生产.为此,我们根据采场空气流动理论及无煤柱开采采空区沼
In the high biogas thick seam stratified with the mining of non-pillar mining, the top layer stope methane emissions, often accounting for the same section of the coal seam biogas content of 40 to 60% of which gob gas from gob Of the stratified biogas emission is 60-65%, and its percentage increases with the increase of the depth of coal mining. In particular, it is easy to cause stratification when it is co-mining with adjacent coal seams or sub-strata in the same section The gob of the goaf overflows through tailholes, resulting in the exceeding of the biogas content in the section orbital lane (up to 1.80 ~ 2.50%), seriously affecting the normal production of mining face and mining face in the mining area. Therefore, Stope air flow theory and non - pillar mining goaf