孤岛工作面沿空掘巷合理煤柱宽度数值模拟研究

Numerical Simulation on Reasonable Coal Pillar Width of Driving Roadway along Goaf in Isolated Island Working Face

随着煤矿开采深度的不断增加,井下生产环境逐渐变得恶劣。为了保障生产的正常接续,煤矿经常采用跳采的方式,造成了孤岛工作面的存在。基于已有的研究发现,留设合理宽度的护巷煤柱是维持巷道稳定性的主要方法之一。为了获取柴里煤矿263_下17工作面区段煤柱的合理宽度,采用数值模拟方法,研究了不同时期、不同煤柱宽度条件下,区段煤柱内应力分布情况和围岩表面位移变化情况,确定了263_下17工作面合理的区段煤柱宽度为6 m。经过现场实践验证,263_下17工作面巷道围岩控制方案合理有效,相关经验可以为相似工作面巷道维护提供借鉴。

With the continuous increase in the depth of coal mine production,the underground production environment is gradually deteriorating.In order to ensure the normal continuity of production,coal mines often use skip mining,resulting in the existence of isolated island working faces.Based on existing research findings,leaving a reasonable width of coal pillars for roadway protection is one of the main methods to maintain the stability of the roadway.In order to obtain a reasonable width of the coal pillars in the 263down17 working face section,this paper used numerical simulation method to study the distribution of stress inside the coal pillars and the changes in surface displacement of the surrounding rock at different periods and under different coal pillar widths.The reasonable section coal pillar width of the 263down17 working face is determined to be 6 m.After on-site practice verification,the surrounding rock control plan for the 263down17 working face roadway is reasonable and effective,and relevant experience can provide reference for similar working face roadway maintenance.