摘要
针对极近距离煤层下伏回采巷道距上覆采空区间距不等的特点,采用统一性的支护方案易造成支护稀疏或支护过度的问题。基于有效锚固层“叠加梁”理论,根据极近距离煤层层间距变化将实验地段风巷划分为“大于6.0m、4.0~6.0m和小于4.0m”三个区域,针对性提出极近距离煤层回采巷道顶板分区域支护方案,通过数值模拟计算论证了方案的可行性,并在任楼煤矿工作面回采巷道进行工业性试验。结果表明:不同区域采用针对性支护后围岩均较稳定,巷道围岩变形得到了合理的控制,巷道总体变形量较小,分区域式支护技术有效控制下伏巷道围岩变形,保证了矿井安全生产,降低了企业成本。
With the uneven spacing between the entry under contiguous coal seams and the overlying goaf,it is likely to cause the problem of sparse or excessive support using a unified support scheme.Based on the superimposed beam theory of effective anchoring layer,the return airway in the test area was divided into three areas with different inter-seam spacing:greater than 6.0 m,4.0~6.0 m and less than 4.0 m,and a sub-regional support scheme was proposed for the entry roof of contiguous coal seams,and the industrial tests was conducted after the scheme feasibility was proved with numerical simulation calculation.The results show that,the surrounding rock is stable in different areas after the support scheme was implemented,surrounding rock deformation of the entry was controlled,the overall deformation of the roadway was small,demonstrating the zoning support effect was favorable,which ensured the safe production and reduced the cost for the enterprise.
作者
马力
MA Li(Production Technology Department of Wanbei Coal Power Group,Huaibei 234000,China)
出处
《煤炭工程》
北大核心
2024年第3期51-56,共6页
Coal Engineering
关键词
极近距离煤层
分区支护
数值模拟
支护方案
耦合支护
contiguous coal seams
zoning support
numerical simulation
support scheme
coupling support
