涨壳式预应力中空锚杆的研究与应用.pdf

·隧道施工· 涨壳式预应力中空锚杆的研究与应用 卢小刚 (中铁十八局集团自．限公司隧道t程公司天津300222) 摘要通过研究涨壳式预应力中空锚杆和普通砂浆锚杆在限制隧洞围岩塑性范围、控制洞室围岩位移变化、锚 杆支护轴向力这三个方面的对比分析，说明了涨壳式预应力中空锚杆具有更好的锚固效果。锦屏二级水电站东端 2号引水隧洞中应用涨壳式预应力中空锚杆，解决了临时支护与永久支护二者如何有机结合的问题，最大程度地提 高施工进度，而且对高地应力情况下的坍塌、岩爆也可起到很明显的防治效果。 关键词 引水隧洞 涨壳式锚头预应力 中空锚杆 中图分类号U455．4文献标识码A+B文章编号1009—4539(2009)11—0096—03 HollowAnchorRod and ofthe Pre-·stressed StudyApplicationExpanding-shell LuXiaogang 18”Bumau (China GroupCo．Ltd．，Tianjin300222，China) Railway and the hollowanchorrodandthe mortaranchorrod Abstract ordinary Bystudyinganalyzingexpanding--shellpre·-stressed the limitationofthe ofthetunnel ofthe from three surroundingrock，thedisplacement aspects，thatis，the plasticrange andtheaxialforceofanchorrod betterreinforcementeffectofthe controlchamber rock surrounding support，the expanding— shell hollowanchorrodcanbe ofthe hollowanchorrod pre·stressed proved．Theapplicationexpanding—shellpre-stressed onthe diversiontunnelintheeasternendof 2 Stationsolvedthe ofthecombinationof No．2 JinpingHydropower problem the and andmaximizedthe oftheconstructionand thetunnel temporarypermanentsupport speed greatlyprevented collapse rock of and burstunderthecondition highgeostresses． anchor rod wordsdi