Key Laboratory of Deep Coal Resource Mining, Ministry of Education, School of Mines, China University of Mining &
Trechnology

随矿井开采深度不断延伸,高应力、强采动导致U型钢支架与锚杆(索)支护破坏失效的问题越来越严重。通过理论分析与现场调研,将U型钢支架破坏失效划分为面内结构性受载破坏、搭接部位撕裂折损、卡缆失效破坏、拉杆和背板失效破坏、轴力错断型折损、纵向扭曲折损、综合性破坏等7类,将锚杆(索)支护失效形式划分为粘结失效型、围岩失效型、杆体破断失效型、护表构件失效型等4类。在此基础上,提出架型优选、壁后充填、薄弱点锚杆(索)强化等3项技术控制U型钢支架破坏失效,提出锚杆杆体强化、护表构件性能提升、树脂锚固剂性能改造、围岩滞后注浆等4项技术控制锚杆(索)支护破坏失效。

The problem of high geo- stress and strong mining disturbance accelerated the failure of supporting bolt system and U- steel frame in coal mine roadway with the increase of mining depth. Based on theoretical analysis and field research, this paper divided U-steel frame into seven types which were in-plane structure failu re, joint tearing breakage, clamp failure, tie-rod and back-plane failure, axial force inducing breakage, deviating force inducing failure, multi-mechanism inducing failure. As for supporting bolt system failure, we classified it as debonding failure, surrounding rock failure, bolt fracture, surface protecting components ailure. Further, we pro posed three technologies including optimization of U- steel frame specification, backilling behind frame, structural reinforcement with bolt and cable on weakness part, to avoid the failures of U-steel frame. Meanwhile, we posed four technologies which were bolt reinforcement, performance improvement of surface protecting componen ts, improvement of resin anchoring agent, surrounding rock delayed grouting, to avoid the failures of supporting bolt system.

国家重点基础研究发展计划(973计划)资助项目(2013CB227904)；国家自然科学基金资助项目(51274193)；教育部科学技术研究资助项目(113030A)；