摘要
运用理论计算和FLAC数值模拟的方法,对极近距离不稳定煤层联合开采护巷煤柱宽度进行了分析,根据采煤工作面侧向支承压力分布规律和经验公式,得出护巷煤柱的宽度必须大于14 m才能避免侧向支承压力峰值的影响的结论。由数值模拟得出,掘进对煤柱的应力分布影响相对较小,而采动对煤柱的应力分布影响较大。不同埋深的煤柱应力分布大小不同,埋藏越深煤柱应力越大;采掘对不同宽度煤柱的应力分布影响不同,煤柱越小,应力集中越大,煤柱越不稳定;而煤柱越大,应力叠加越不明显,煤柱越稳定。综合考虑各种因素,刘东煤矿西三采区护巷煤柱的宽度确定为15 m。
This paper analyzes the width of the coal pillar for the combined mined unstable very contiguous seams by theoretical analysis and FLAC numerical simulation.On basis of the side abutment pressure pattern and empirical formula,it finds that the coal pillar must be wider than 14m to avoid influence of the peak value of the side abutment pressure.It concludes from numerical simulation that tunneling effect on the stress distribution of the pillar is relatively minor while influence of mining is major;the deeper the pillar is buried,the bigger of the stress;and the effect of mining on pillar stress varies along with the width of the pillar： the wider the pillar is,the more stable of the pillar.Considering various factors,coal pillar width of the Western 3rd mining area of Liudong Mine is determined into 15m.
出处
《中国煤炭》
北大核心
2011年第5期64-68,共5页
China Coal
关键词
极近距离不稳定煤层
联合开采
护巷煤柱
理论分析
数值模拟
unstable very contiguous seams
combined mining
coal pillar
theoretical analysis
numerical simulation
