常村煤矿2207工作面煤柱稳定性实测分析

Field measurement and analysis of coal pillar stability in 2207 working face of Changcun Mine

为分析常村煤矿2207工作面煤柱的稳定,拟采用实测的方法进行研究。首先说明了煤柱应力监测的必要性,其次设计了煤柱应力监测方案和监测设备,最后对监测数据进行分析,分析煤柱的受力和稳定性,可以得到,回采巷道补强支护后,煤柱左侧塑性破坏区深度为5 m,右侧塑性破坏区深度推测为9 m,弹性核区宽度推测为13 m,巷道处于稳定状态;若未进行补强,煤柱宽度取27 m,无法保证回采巷道稳定。仅在观测时期内,2207轨顺顶底板移近243 mm,两帮移近351 mm,这表明现有煤柱宽度及巷道支护参数不合理。根据实测结果,2207工作面回采时,较显著的超前影响距离约为40~60 m,因此回采巷道超前支护距离应大于60 m,在考虑安全系数的情况下,现有规程中超前支护距离较为合理。

In order to analyze the stability of coal pillar in 2207 working face of Changcun Mine, the method of actual measurement was adopted. Firstly, the necessity of stress monitoring of coal pillar was explained. Secondly, the stress monitoring scheme and monitoring equipment of coal pillar were designed. Finally, the monitoring data were analyzed and the stress and stability of coal pillars were analyzed. It could be concluded that the depth of plastic failure zone on the left side of coal pillars was 5 m, the depth of plastic failure zone on the right side was 9 m, the width of elastic core zone was 13 m, and the roadway was in a stable state. Without reinforcement, the width of coal pillars was 27 m, which could not guarantee the stability of mining roadway. Only in the observation period, 2207 rail roadway moved near 243 mm along the roof and floor, 351 mm among the two sides, which indicated that the existing coal pillar width and roadway support parameters were unreasonable. According to the measured results, in 2207 working face, the significant advance influence distance was about 40 ~ 60 m, so the advance support distance of mining roadway should be more than 60 m. Considering the safety factor, the advance support distance in the existing regulations was more reasonable.