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1、考虑岩体时效深埋隧洞施工过程的理论解析——开挖、锚喷与衬砌支护的全过程模拟与解答王华宁1，曾广尚1，蒋明镜2(1.同济大学航空航天与力学学院，上海200092；2.同济大学土木工程学院地下建筑与工程系，上海200092)摘要：对具有时效特性的流变岩体，施工过程对围岩力学响应有显著影响。针对黏弹性时效岩体中深埋圆形隧洞的断面及纵向开挖、锚喷和衬砌施工，用圆柱型正交各向异性弹性体模拟锚固后岩体，建立材料特性变化后锚固区力学响应的计算方法，进而导出Burgers岩体全施工过程的封闭解析解。根据解答分析了锚固区各向异性程度、锚固及衬砌支护时刻、锚固厚度对锚固区应力、位移的影响。分析
2、表明：锚固区环向刚度的改变可显著影响岩体力学响应，而改变径向刚度则变化极小；衬砌受力与其施加时刻相关，而受锚固时刻影响不大；增加锚固区厚度可减小位移，优化锚固区受力，但对衬砌的受力影响很小。本解答可进行相似条件下隧洞初步设计。关键词：时效；锚喷支护；解析解中图分类号：TU457文献标识码：A文章编号：1000–4548(2014)07–1334–10作者简介：王华宁(1975–)，女，副教授，主要从事岩土工程中数值与解析方法研究。E-mail:wanghn@tongji.edu.cn。Analyticalsolutionsofdeeplyburiedtunnelduring
3、constructionconsideringtime-dependentbehaviorsofrock——simulationsandsolutionsofsequentialexcavation,rockboltreinforcementandlinerinstallationWANGHua-ning1,ZENGGuang-shang1,JIANGMing-jing2(1.SchoolofAerospaceEngineeringandAppliedMechanics,TongjiUniversity,Shanghai200092,China;2.Departmentof
4、GeotechnicalEngineering,CollegeofCivilEngineering,TongjiUniversity,Shanghai200092,China)Abstract:Fortherheologicalrockwithtime-dependentbehaviors,themechanicalresponseisgreatlyaffectedbythesequentialconstructionofthetunnel.Thecross-sectionexcavation,longitudinaladvancement,rockboltreinforc
5、ementandlinerinstallationareaccountedforduringtheanalyticalderivationforadeeplyburiedcirculartunnelinviscoelasticrock.Thecharacteristicsofrockboltreinforcementregionareregardedashomogeneouscylindricallyanisotropicelasticity,andthecorrespondingmethodisthenproposed.Accountingforthewholeconst
6、ructionprocess,includingsequentialexcavation,reinforcementandlinerinstallation,theclosedformsolutionsarederivedwhentherockissimulatedtoBurgersviscoelasticmodel.Basedonthesolutions,anextensiveparametricanalysisisthenperformedtoinvestigatetheinfluencesofanisotropydegree,installationtimeofroc
7、kboltandlinerandthicknessofreinforcedregionontunnelconvergenceandthestresses.Theanalysisshowsthatthehoopstiffnessofthereinforcedregionhasasignificantimpactonthemechanicalresponseofrock,whiletheeffectofradialstiffnessismuchless.Thestressesofthelineraregreatlyaf
