支护强度对沿空掘巷煤柱稳定性影响  

Effect of supporting intensity on stability of narrow coal pillar in gob-side entry driving

作　　者：张源[1] 万志军[1] 程敬义[1] 张博[1] 巩利斌[1] 

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《辽宁工程技术大学学报（自然科学版）》2013年第4期443-448,共6页Journal of Liaoning Technical University (Natural Science)

基　　金：教育部新世纪优秀人才支持计划资助项目(NCET-10-0770);江苏省普通高校研究生科研创新计划资助项目(CXZZ11-0309)

摘　　要：掌握沿空掘巷窄煤柱采空区侧已有支护结构对煤柱稳定性的影响.采用FLAC3D有限差分数值模拟方法,研究不同支护强度条件下窄煤柱的变形和破坏规律.研究结果表明:上区段工作面回采和沿空掘巷对煤柱稳定性的影响较大,窄煤柱采空区侧的煤体先于巷道侧进入塑性区,变形量远大于巷道侧;采空区侧的支护结构对限制煤体塑性区扩展的作用不明显,支护强度对煤柱稳定性的影响较小;采空区侧的支护结构很容易失效或强度发生严重衰减,巷道侧的支护结构受采动影响小,护强度对窄煤柱稳定性的影响程度大于采空区侧.To find out the influence of pre-existing gob-side supporting structure in narrow coal pillar of gob-side entry driving on the stability of coal pillar,the FLAC3D finite difference numerical simulation method is adopted in this paper to study the deformation and failure regularity of narrow coal pillar under different supporting intensity.The result indicates that both coal mining in last working face and gob-side entry driving have great impact on the stability of coal pillar,moreover,the coal of narrow coal pillar on the gob side is prone to turn plastic than that on the entry side.The deformation amount is much larger than that on the entry side as well.The supporting structure on the gob side is not so effective in constraining the expansion of plastic zone;its supporting intensity exerts little influence on the stability of coal pillar.The supporting structure on the gob side is apt to fail or weaken seriously in its intensity,whereas,the supporting structure on the entry side is hardly affected by mining,meanwhile,its supporting intensity exerted on the stability of narrow coal pillar is larger than that on the gob side.

关 键 词：巷道支护 沿空掘巷 窄煤柱 煤柱稳定性 支护结构 锚杆支护 支护强度 数值模拟 

分 类 号：TD325[矿业工程—矿井建设]