摘要
针对塔山煤矿特厚煤层沿空掘巷小煤柱合理尺寸问题,综合理论分析、数值模拟与工程实践,基于极限平衡理论与“内外应力场”理论,推导出煤柱合理宽度范围为5.28~8.2 m;通过数值模拟对比6 m、7 m和8 m煤柱的围岩响应,发现6 m煤柱垂直应力峰值最低,塑性区扩展速率最缓,弹性核区承载效率最优,现场工业性试验验证了6 m小煤柱配合相应的支护体系,巷道顶底板移近量(300~500 mm)与两帮变形量(500~700 mm)均处于可控范围,实现了坚硬顶板特厚煤层沿空巷道的高效控制。
To address the rational size of small coal pillars for gob-side entry driving in extra-thick coal seams at Tashan Coal Mine,this study integrates theoretical analysis,numerical simulation,and engineering practice.Based on the limit equilibrium theory and the"internal and external stress field"theory,the reasonable width range of coal pillars is derived as 5.28~8.2 m.Numerical simulations comparing the surrounding rock responses of 6 m,7 m and 8 m coal pillars reveal that the 6 m pillar exhibits the lowest peak vertical stress,the slowest plastic zone expansion rate,and the optimal load-bearing efficiency of the elastic core zone.Industrial field tests demonstrate that a 6 m small coal pillar,combined with an appropriate support system,effectively controls roadway deformations:roof-to-floor convergence(300~500 mm)and rib deformation(500~700 mm)remain within manageable ranges.This approach achieves efficient control of gob-side roadways in extra-thick coal seams with hard roof conditions.
作者
白佳鹏
BAI Jiapeng(Tongmei Datang Tashan Coal Mine Co.,Ltd.,Datong 037004,China)
出处
《煤》
2026年第2期59-64,共6页
Coal
关键词
特厚煤层
坚硬顶板
小煤柱
沿空掘巷
extra-thick coal seam
hard roof
small coal pillar
gob-side entry driving
