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ID:51510314
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页数:5页
时间:2020-03-26
《秦岭特长隧洞超埋深强构造应力大变形处理技术研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、水利水电技术第48卷2017年第7期秦岭特长隧洞超埋深强构造应力大变形处理技术研究王江(中铁第一勘察设计院集团有限公司,陕西西安710043)摘要:引汉济渭秦岭特长输水隧洞全长81.779km,隧洞穿越秦岭岭南中低山区,地质条件极其复杂,断裂构造极为发育,且具有强构造应力。受复杂地质条件和地质构造的影响,秦岭隧洞14勘探试验洞主洞段施工中发生了不同程度的大变形,原设计围岩类别为Ⅲ类,实际施工过程中已经达到Ⅳ类和V类,初期支护完成后变形严重。多处变形量超过10mm/d,局部最大变形量达到了69cm,给施工带来了极大的困难。对发生大变形段采取了
2、二次套拱、加长锚杆、径向注浆、初支拆换、二次衬砌加强等措施进行控制。今后大变形段设计施工过程中,应通过加强超前地质预报与监控量测、提高支护设计参数、加大预留变形量来预防大变形的发生。关键词:秦岭特长输水隧洞;超埋深;强构造应力;大变形;处理技术;引汉济渭工程doi:10.13928/j.cnki.wrahe.2017.07.011中图分类号:U455.49文献标识码:B文章编号:1000.0860(2017)07.0064.05Studyontechnologiesfortreatmentoflargedeformationofextra-
3、longQinlingTunnelundersuperburieddepthandstrongtectonicstressWANGJiang(ChinaRailwayFirstSurveyandDesignInstituteGroupCo.,Ltd.,Xi’an710043,Shaanxi,China)Abstract:Withthetotallengthof81.779km.tlleextra—longQinlingWaterDeliveryTunnelforHanjiangRiver.to.WeiheRiverWaterDiversio
4、nProjectpassesthroughthemiddle-lowmountainousareaoftheSouthofQinlingMountainunderacomplicatedge.ologicalcondition:i.e.over-developedfracturingstructureandstrongtectonicstress.Undertheimpactsfromthecomplicatedge.ologicalconditionandgeologicalstructuretherein,thelargedeforma
5、tionswithvariousSCalesOCCUrduringtheconstructionofthemaintunneloftheNo.1exploration—testtunnelfortheconstructionofQiulingWaterDeliveryTunnel,forwhichtheoriginalde.signclassificationofthesurroundingrockisClassIII,butitreachesClassIVandClassVduringtheactualconstruction.thusd
6、eformationisquiteseriousafterthecompletionoftheinitialsupport.Thedeformationamountsatmanylocationsa阳OVer10mm/dandthemaximumlocaldeformationamountreaches69cm,andthenthedeformationbringsgreatdifficultytotheconstruc—tion.Forthoselargelydeformedtunnelsections,thecontrolmeasure
7、s,suchassecondarycover-arch,prolongedanchorrod.ra.dialgrouting,secondarylining,etc.,areadopted.Duringthedesignandconstructionofthelargelydeformedtunnelsectionsinthedaystocome,thelargedeformationmustbepreventedthroughstrengtheningtheadvancedgeologicalpredictionandmonito.rin
8、gsurvey,raisingthedesignparametersofsupportandenlargingreserveddeformationamount.Keywords
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