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1、第33卷第1期2016年1月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentVoL33No．1Jan．2016doi：10．3969／j．issrr1002—0268．2016．01．015考慮峰后特性的隧道圍巖錨固力學(xué)效應(yīng)肖旺，蘇永華，方硯兵(湖南大學(xué)土木工程學(xué)院，湖南長(zhǎng)沙410082)摘要：圍繞處于峰后狀態(tài)的隧道圍巖在全長(zhǎng)黏結(jié)錨桿支護(hù)下的力學(xué)機(jī)制進(jìn)行研究。按力學(xué)特征，將在次生應(yīng)力作用下的峰后狀態(tài)圍巖由隧道臨空面往深處依次劃
2、分為殘余強(qiáng)度區(qū)、塑性軟化區(qū)及彈性變形區(qū)?；阱^桿黏結(jié)抗滑移變形支護(hù)抗力產(chǎn)生原理，導(dǎo)得錨桿軸向應(yīng)力及抗剪強(qiáng)度方程。將全長(zhǎng)黏結(jié)錨桿通過巖石一錨固面對(duì)圍巖提供的支護(hù)力等效為圍巖單元徑向體積力，建立了考慮錨桿支護(hù)效應(yīng)的微元體平衡方程；將該平衡方程分刺與考慮峰后體積擴(kuò)容及軟化特征的殘余帶、軟化帶塑性相容方程聯(lián)合，推出了隧道峰后國巖殘余區(qū)、軟化區(qū)在注漿錨桿支護(hù)下位移、應(yīng)力及范圍的計(jì)算公式?；诶碚撗芯康膶?shí)例分析，進(jìn)一步揭示了注漿錨桿與圍巖內(nèi)部錨固效應(yīng)．錨桿端部預(yù)緊力對(duì)峰后圍巖軟化、擴(kuò)容性質(zhì)的改善作用和對(duì)圍巖各區(qū)
3、范圍發(fā)展及隧道周邊變形的控制作用。關(guān)鍵詞：隧道工程；隧道圍巖；解析法；軟巖擴(kuò)容；錨固效應(yīng)；應(yīng)變軟化；界面剪應(yīng)力；預(yù)緊力中圖分類號(hào)：U451+．2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002—0268(2016)01—0095—08AnchorageMechanicalEffectofTunnelSurroundingRockConsideringPost·peakCharacteristicsXIAOWang，SUYong—hua，F(xiàn)ANGYan-bing(CollegeofCivilEnsineering，H
4、unanUniversity，ChangshaHunan410082，China)Abstract：Themechanicalmechanismofpost-peaktunnelsurroundingrockstateunderbondedboltingsupportisstudied．Accordingtothemechanicalcharacteristics，thepost—peaksurroundingrock，whichundertheeffectofsecondarystress，fro
5、mfreesurfacetothedeeptunnel，inturn，Callbediddedintoresidualstrengthzone，plasticsofteningzoneandelasticdeformationzonerespectively．Then，theboltaxialstressandshearstrengthequationsarederivedbasedontheprincipleofboltbondingresisttoslidingdeformation．Assum
6、ingthesupportingforceproddedbybondedrockbolttllmughrock—anchoragesurfaceisequivalenttobeelementradialvolumeforceofthesurroundingrock，theelementbalanceequationisestablishedundertheinfluenceofboltingsupport．Meanwhile，combiningthebalanceequationwiththeequ
7、ationofresidualandsofteningplasticzonescompatibilitythatconsideringthepost—peakvolumedilatancyandsofteningcharacteristics，thecomputationalformulasofdisplacement，stressandrangeofpost-peakresidualandsofteningzoneoftunnelsurroundingrockundergroutedbeltsup
8、portarederived．Basedontheoreticalresearchcases，theanchorageeffectbetweengroutinganchorandsurroundingrock，thesignificanteffectsofboltendpretighteningforceinimprovingpost-peaksofteninganddilatancycharacteristics，andcontrollingthedevelopme
