小窑破坏区复采期间瓦斯分布规律研究
Gas Distribution Law during Repeated Mining Period of Small Kiln Damaged Area
高毓晖1
作者信息
- 1. 山西煤炭进出口集团蒲县万家庄煤业有限公司,山西 蒲县 041204
- 折叠
摘要
为掌握复采煤层瓦斯分布规律及涌出规律,解决复采期间局部瓦斯异常涌出、积聚和瓦斯超限等难题,以腾晖煤业2#煤层三采区遗存采空巷(区)及煤柱为研究对象,研究了工作面与空巷(区)的位置关系,在瓦斯基础参数测试上,对下分层复采期间应力变化特征与瓦斯运移特征进行了分析.研究表明:在密闭空间内瓦斯体积分数超过 28.4%时,瓦斯压力高达 0.045 MPa;当工作面空巷揭露时,瓦斯瞬时气流速度可达 440 m/s,之后迅速下降.
Abstract
In order to grasp the distribution and emission patterns of gas in the repeated mining coal seam,and solve the problems of local abnormal gas emission,accumulation,and gas exceeding limits during the repeated mining period,taking the remaining goaf(area)and coal pillar in the third mining area of 2#coal seam of Tenghui Coal Industry Co.,Ltd.as the research object,this paper studied the positional relationship between the working face and the goaf(area),and analyzed the stress variation and gas migration characteristics during the lower layer repeated period on the basis of gas basic parameter testing.This study shows that when the gas volume fraction in a confined space exceeds 28.4%,the gas pressure can reach as high as 0.045 MPa;when the empty roadway of the working face is exposed,the instantaneous gas flow speed can reach 440 m/s,and then rapidly decreases.
关键词
小窑破坏区/复采/瓦斯分布规律/应力变化Key words
small kiln damaged area/repeated mining/gas distribution law/stress change引用本文复制引用
出版年
2024
NETL
NSTL
万方数据