摘要
针对兴跃煤矿2#煤层回风大巷围岩变形量大这一问题,基于弹塑性力学及巷道围岩控制理论,采用理论分析及数值计算的方法,对深部大断面软岩巷道的变形破坏机理及高预应力联合支护技术进行了研究,提出采用"锚杆+钢筋梯子梁+钢筋网+锚索"联合支护方案。现场工程实践表明,采用高预应力联合支护技术后,顶板下沉量为48 mm,两帮移近量为86 mm,底鼓量为120 mm,离层量控制在26 mm以内,效果良好,得出高预应力联合支护技术可以较好控制大断面软岩巷道围岩变形及顶板离层,提高巷道整体稳定性。
Aiming at the surrounding rock deformation problem of 2# coal seam return air roadway in Xingyue Coal Mine, the methods of theoretical calculation and numerical simulation were applied to analyze the deep and large section soft rock roadways deformation dam- age mechanism and high strength prestressed supporting technology based on the elasticity -plastieity mechanics and surrounding rock control theory. The article proposed ＂anchor ＋ steel ladder beam ＋ steel fabric ＋ anchor cable＂ combined supporting scheme. The industrial test showed that roof subsidence was 48 mm, the convergence of two walls was 86 mm, floor heave was 120 ram, separation volume is less than 26 mm, and the control effect was good. Roadway deformation and roof abscission layer deformation can be well controlled under high - stress and pretension bolting supporting technology, which improves the stability of roadway integrally.
出处
《煤矿安全》
CAS
北大核心
2014年第6期128-131,135,共5页
Safety in Coal Mines
基金
国家自然科学基金面上资助项目(51174142)
教育部新世纪优秀人才支持计划资助项目(NCET-11-1036)
霍英东教育基金2011年高等院校青年教师基金资助项目(132023)
山西省科技攻关资助项目(20110321015-03)
山西省科技成果推广资助项目(2013071050)
山西省优秀青年学术带头人资助计划资助项目
关键词
破坏机理
理论分析
数值计算
联合支护
高强预应力
damage mechanism
theoretical analysis
numerical calculation
combined support
high strength prestressed
