深部大采高综采工作面区段煤柱宽度优化研究

Width Optimization of Section Coal Pillar of Deep Fully Mechanized Mining Face

为解决深部大采高综采工作面大尺寸区段煤柱护巷效果与煤炭资源回收率之间的矛盾,以红庆河3-1煤大采高工作面为研究背景,通过极限平衡理论计算深部采场煤柱塑性区、弹性区宽度,采用应力监测手段分析煤柱内应力分布特征,结合不同宽度煤柱数值模拟结果,得出结论:3-1401工作面回采侧与掘进侧塑性区宽度分别为6. 28m、5. 83m,并采用数值模拟计算对该结果进行了验证;应力监测结果表明,40m煤柱呈现双峰状应力分布特征,应力集中程度明显,回采侧应力峰值位于距煤壁6m位置,应力集中系数达2. 18,掘进侧应力峰值位于距煤壁5m位置,应力集中系数为1. 98;综合以上分析结论,确定该条件下区段煤柱合理宽度为25m。

In order to solve the contradiction between the large-size section coal pillar retaining roadway and the coal resource recovery rate in the deep mining height fully mechanized mining face,the Hongqinghe 3-1 coal seam large mining height working face was taken as the research background. According to the limit equilibrium theory,the plastic zone and elastic zone width of the coal pillar in the deep stope were calculated. The stress monitoring method was used to analyze the stress distribution characteristics of coal pillars. Aand combined with the numerical simulation results of coal pillars with different widths. The conclusions were as follows: the width of the plastic zone on the mining side of the 3-1401 working face was6. 28 m,and the width of the plastic zone on the roadway side was 5. 83 m. The results were verified by numerical simulation.The results of stress monitoring show that the 40 m coal pillar exhibits double-peak stress distribution characteristics,and the stress concentration was obvious. The peak of the mining side stress was located at 6 m away from the coal wall,the stress concentration coefficient was 2. 18,and the peak of the excavation side was located 5 m away from the coal wall. The coefficient was 1. 98. Based on the above analysis,it was determined that the reasonable width of the section coal pillar was 25 m under this condition.