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针对东易煤矿4102工作面回风巷道迎4101回采工作面掘进带来的巷道布置难题,综合数值模拟、理论计算等方法,对距4101工作面不同距离处的侧向支承应力分布、顶板挠度分布和不同宽度煤柱内部塑性区分布进行了分析。结果显示,支承应力和挠度值呈“驼峰状”分布;当巷道布置在挠度峰值内侧时,煤柱内部仍有弹性稳定区,保证了煤柱稳定性和承载能力;结合东易煤矿实际生产条件,最终确定了东易煤矿4102回风平巷的护巷窄煤柱宽度为7 m。
In view of the difficulty of roadway arrangement brought by the tunneling of 4101 working face in the return airway of 4102 working face in Dongyi Coal Mine, the lateral bearing stress distribution and the deflection distribution of the roof at different distances from 4101 working face are obtained by comprehensive numerical simulation and theoretical calculation. And different width of coal pillar plastic zone distribution were analyzed. The results show that the support stress and deflection values are “hump” distribution. When the roadway is arranged inside the deflection peak, the coal pillar still has an elastic stability zone inside, which ensures the stability and bearing capacity of the coal pillar. Production conditions, the final narrow coal pillar width of 4102 return roadway in Dongyi Coal Mine is 7 m.