不同宽度煤柱下沿空掘巷数值模拟研究及应用

Numerical Simulation of Driving Roadway along Gob with Different Wide Coal-pillars and Its Application

以山西潞宁煤矿工程地质条件为背景,对工作面回采后煤柱受力情况进行了理论分析。采用FLAC3D有限差分程序计算研究了不同宽度煤柱在煤岩体中的应力分布、位移场变化、塑性破坏及锚杆受力情况。模拟结果表明:不同宽度煤柱内部煤岩体应力集中系数、位移场、塑性区破坏以及锚杆受力情况都不相同。工作面回采后,靠近采空区一侧的3～8m范围内矿压显现严重,不宜布置巷道;当煤柱宽度超过10m时,变化就不再明显。研究成果为沿空掘巷巷道位置和支护方式的选择提供了参考依据。

Taking the geological condition of Luning Colliery as example,this paper analyzed stress state of coal pillar after mining by theoretical method Applying FLAC3D,It researched stress distribution,displacement,plastic damage and stress state of anchored bolts under the condition of different wide coal pillars Results showed that stress concentration coefficient,displacement field,plastic damage zone and stress state of anchored bolt were varied with different wide coal pillars After mining,underground pressure behavior was serious at the range of 3-8m along gob,so it was unfit for roadway location When the pillar width was over 10m,the variation was not clear This provided reference for selecting roadway location and supporting manner.