基于SMP准则的旧采区遗留煤柱稳定性研究

Stability Analysis of Left Coal Pillars in Old Mining Area on SMP

为了探究旧采区遗留煤柱稳定性,基于SMP屈服准则,对煤柱强度和临界宽度进行计算,得到煤柱弹性核区应力分布特征,推导出不同状态时煤柱稳定的极限宽度计算公式。研究表明:SMP屈服准则在旧采区遗留煤柱稳定性判定中是适用的,煤柱处于静置和回采时保持稳定的极限宽度差异较大,将上述结论运用到望田煤业旧采区煤柱稳定性分析中,结果与现场实际较为吻合,对于旧采区煤柱安全回采具有重要意义。

To explore the stability of left coal pillars in old mining area, based on the yield criteria of SMP, the calculation of pillar strength and critical width achieved the stress distribution of elastic central zones of the pillars and the formula of the critical width in different situations. The study demonstrated that the yield criteria of SMP was applicable in the stability judgment. When the pillars were stable or during caving mining, the difference of the critical widths increased. The results could be used in the stability analysis of the coal pillars in Wangtian Mine. The results match with the actual condition, which is important for the safe caving of coal pillars in the old mining areas.