隧道钢拱节点让压性能分析  

Yielding Performance of Tunnel Steel Arch Joints

作　　者：董标 杨进京[2] 殷洪波[2] 徐国林 DONG Biao;YANG Jinjing;YIN Hongbo;XU Guolin(Institute of Civil Engineering,Southwest Forestry University,Kunming 650224,Yunnan,China;Kunming Survey,Design and Research Institute Co.,Ltd.of GREEC,Kunming 650200,Yunnan,China)

机构地区：[1]西南林业大学土木工程学院,云南昆明650224 [2]中铁二院昆明勘察设计研究院有限责任公司,云南昆明650200

出　　处：《隧道建设（中英文）》2021年第9期1524-1529,共6页Tunnel Construction

基　　金：云南省重点研发计划(社会发展领域)项目(2018BC008)。

摘　　要：为解决高地应力下隧道初期支护结构因软岩变形出现破坏的问题,对围岩让压技术进行研究,改进一种能释放支护位移、降低围岩压力的让压节点。基于有限元模拟和1∶1原型节点轴向加载试验,分析螺栓预紧力和槽型形状对让压节点工作性能的影响,分析结果表明:1)让压节点能够按设定的方式释放变形,且抵抗变形的阻力稳定;2)预紧力和滑槽形状对让压节点性能影响显著,预紧力越大,滑槽越窄,抗滑动阻力越高;3)径缩滑槽型节点消耗的能量大,安全储备高。由此可知,让压节点具备释放围岩能量的作用,工作过程中能提供稳定的阻力。The primary support structure of the tunnel would be damaged due to soft rock deformation under high ground stress.Therefore,the yielding technology of surrounding rock is investigated and the yielding joint to relieve support displacement and reduce surrounding rock pressure is proposed.The influence of bolt preload and groove shape on the working performance of yielding joint is analyzed based on finite element simulation and a 1∶1 prototype joint axial loading test.The analytical results show the following.First,the joint deformation pressure can be released according to setting mode,and the resistance to deformation is stable.Second,the preload and groove shape significantly affect yielding joint;the greater the preload and the narrower the groove,the higher the sliding resistance.Finally,the type of diameter shrinkage groove consumes huge energy,with a high safety reserve.Therefore,the yielding joint can release surrounding rock energy and provide stable resistance during the working process.

关 键 词：挤压性围岩 隧道 让压技术 让压节点 可让式支护 滑槽 预紧力 

分 类 号：U452[建筑科学—桥梁与隧道工程]