秦岭特长隧洞超埋深强构造应力大变形处理技术研究.pdf

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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