大跨度巷道顶板垮冒规律与减跨支护技术研究  

Roof collapse laws and reducing-span support technology in long-span roadway

作　　者：李冲[1] 曹悦[1] 程争民 徐金海[1] 陈梁[1] 

机构地区：[1]中国矿业大学矿业工程学院,深部煤炭资源开采教育部重点实验室,煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《采矿与安全工程学报》2015年第6期978-983,988,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学青年基金项目(51304200);中国博士后科学基金项目(2013M540477);中国博士后特别资助基金项目(2014T70560);江苏高校优势学科建设工程资助项目;煤炭资源与安全开采国家重点实验室自主研究课题项目(SKLCRSM11X02)

摘　　要：为了解决高应力大跨度巷道支护难题,以五阳矿7801切眼为工程背景,研究了不同埋深及侧压系数条件下大跨度巷道围岩微裂隙发育状况、应力分布特点、变形破坏及垮冒规律,提出了"二次成巷双微拱断面+锚网索+钢带+单体液压支柱"的减跨支护技术,优化了大跨度切眼支护参数。研究表明,当7801切眼埋深超过600 m时,原支护方案将无法有效控制巷道围岩变形;采用新的减跨支护技术后,7801切眼顶底板最大移近量55.5 mm,两帮最大收敛量25.1 mm,顶板最大离层量24.8 mm,单体支柱最大工作阻力12.52 MPa,有效解决了五阳矿7801切眼难支护的问题,为大跨度巷道支护设计提供参考。In response to the support problem under high stress in long-span roadway, taking the 7801 open-off cut in Wuyang mine as the engineering case, the microfracture development, stress distribution and deformation, failure and collapse laws have been researched in surrounding rock of long-span roadway under different side pressure coefficient and buried depths. The reducing-span support technology consisting of ＂reasonable section shape of secondary tunneling, bolt-mesh-cable, steel strip and hydraulic single prop＂ has been put forward. In the meanwhile, the long-span support parameters of open-off cut have been improved. The research shows that the original support scheme can not effectively control the deformation of roadway surrounding rock when the buried depth of 7801 open-off cut is more than 600 m; while the new reducing-span support technology can effectively control the deformation of surrounding rock, when the maximum for the roof-to-floor convergence, rib-to-rib convergence, roof separation and working resistance of single prop all in control are 55.5 mm,25.1 mm,24.8 mm and 12.52 MPa respectively. The researches effectively solve the support problem of 7801 open-off cut in Wuyang mine and provide reference for support design of long-span roadway.

关 键 词：大跨度巷道 顶板垮冒规律 减跨支护 双微拱断面 

分 类 号：TD353[矿业工程—矿井建设]