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针对河南云煤一矿下部二1煤层21110工作面回采期间,上覆四2煤层21030工作面回风巷道损害严重问题,通过数值模拟分析21110工作面回采后覆岩移动变形和采动应力的特征,引入了危险移动边界线和危险应力边界线的概念。结果表明:通过岩层移动角留设在二1煤层75 m宽保护煤柱不能保证上覆21030工作面回风巷道的稳定性,上覆巷道破坏变形是由覆岩移动和采动应力共同决定的,而哪一方面占主导原因则由巷道所处覆岩中的位置决定,21030工作面回风巷道位于危险移动边界线以外危险应力边界线以内,采动应力是巷道破坏的主要原因,为此提出基于危险应力边界线留设上覆巷道的保护煤柱的方法。
Aiming at the serious damage to the return airway of the 21030 working face above the No. 4 coal seam 211 211 working face during the second mining of No. 211 coal seam in the No. 1 coal seam of the No.12 Coal Seam in Henan Yunmei No.1 Mine, the characteristics of the deformation and the mining stress of the overlying strata after the 21110 mining face are analyzed by numerical simulation , Introduced the concept of dangerous moving boundary and dangerous stress boundary. The results show that the stability of the return airway on the upper 21030 working face can not be guaranteed by the 75m wide protective pillar left in the second coal seam through the rock movement angle. The deformation and failure of the overlying tunnel are decided by the movement of the overburden and the mining stress , While the dominant reason is determined by the position of the overburden in the roadway. The return airway of 21030 working face is located within the dangerous stress boundary line outside the dangerous moving boundary line, and the mining stress is the main reason of the roadway destruction. To this end, The method of setting up protective pillar of overlying roadway based on dangerous stress boundary line is put forward.