缓倾斜厚煤层浅部回采区段煤柱留设宽度优化  

Optimization of Section Coal Pillar Width in Shallow Mining of Gently Inclined Thick Coal Seam

作　　者：张志沛[1] 李锋 ZHANG Zhi-pei;LI Feng(College of Geology and Environment,Xi an University of Science and Technology,Xi an 710054,China)

机构地区：[1]西安科技大学地质与环境学院,西安710054

出　　处：《科学技术与工程》2021年第7期2655-2663,共9页Science Technology and Engineering

基　　金：国家重点研发计划(2016YFE0111900);陕西省重点研发计划(2018KW-022,2017KW-009)。

摘　　要：以某煤矿缓倾斜厚煤层浅部区段煤柱为对象。首先,利用数值模拟方法分析不同煤柱宽度下煤层回采时巷道围岩主应力、塑性区、支护结构应力及位移特征,评价巷道围岩稳定性,确定煤柱合理宽度范围。结果表明:煤柱宽度为3 m时,区段煤柱莫尔应力圆与强度包络线相交、塑性区贯通、支护结构趋于破坏;宽度为6 m时,区段煤柱仅存30%弹性区、支护结构趋于破坏;宽度为9~12 m时,巷道围岩应力圆与强度包络线相离、处于弹性变形阶段、支护结构具有良好的承载力、围岩位移小,满足煤矿生产需求,为煤柱合理宽度范围。其次,通过工程实际验证。结果表明:煤柱宽度为9 m时,能有效控制围岩变形破坏,煤炭生产效率与回收率最优化。可见缓倾斜厚煤层浅部区段煤柱留设优化宽度为9 m。The shallow section coal pillar in a gently inclined thick coal seam of a coal mine was taken as an object.Firstly,the numerical simulation method was used to analyze the principal stress,plastic zone,supporting stress and displacement characteristic during seam mining with different coal pillar widths,to evaluate the stability of roadway surrounding rock and to determine the reasonable width range of coal pillar.The results show that when the width of coal pillar is 3 m,the Mohr stress circle of section coal pillar intersects the strength envelope,the plastic zone penetrates through,and the supporting structure tends to damaged.When the width of coal pillar is 6 m,the elastic zone only accounts for 30%of the section coal pillar zone,and the supporting structure tends to be damaged.When the width of coal pillar is 9~12 m,the stress circle is separated from the strength envelope,the surrounding rock is in the elastic deformation stage,the supporting structure has good bearing capacity and the surrounding rock displacement is small,so it meets the production needs of coal mines.The width is reasonable width range of coal pillar.Secondly,the width of the section coal pillar was verified by the practical application of the project.The results show that when the section pillar width is 9 m,the deformation and destruction of the surrounding rock can be effectively controlled,and the coal production efficiency and coal recovery ratio are optimized.It is concluded that the optimized width of shallow section coal pillar is 9 m in the gently inclined thick coal seam.

关 键 词：区段煤柱 最小主应力 主应力差 塑性区 支护结构应力 围岩位移 

分 类 号：TD263.53[矿业工程—矿井建设]