软厚煤层大断面巷道保护煤柱尺寸留设研究

Study on Protection Pillar Size of Soft and Thick Coal Seam Large Section Roadway

文章以程坑煤矿松软煤层护巷煤柱留设为研究背景,通过理论分析与建立煤柱受力力学模型,计算得出护巷煤柱尺寸不小于27m,进而应用数值模拟手段对不同尺寸煤柱的破坏与受力情况进行分析,得出塑性区宽度随着煤柱尺寸的增大而呈递减趋势,而当煤柱达到稳定状态后,随着煤柱宽度的增加,塑性区基本上不再发生变化;煤柱宽27m时,其弹性区宽度范围在17m^18m,所占比例为62.9%~66.7%,弹性核区率满足要求。综合分析得出程坑软煤层保护煤柱尺寸为27m。

The paper based on Chengkeng soft and thick coal seam protection pillar design, through theoretical analysis and building pillar strength mechanical model, and calculated pillar size not less than 27m, then analyzed damage and stress situation of different size pillar by numerical simulation, and drew that plastic zone showed a decreasing trend with the increase of pillar size, when pillar reach steady state, plastic zone basically no longer change. When pillar size was 27m, elastic zone was 17m^18m, and the proportion was 62.9%~66.7%, and elastic area ratio met the requirement. Comprehensive analysis, we could draw that Chengkeng soft and thick coal seam protection pillar was 27m.