资源描述：
《地铁双线隧道施工人工冻结水热力数值分析_李双洋》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、第9卷第1期交通运输工程学报Vol19No112009年2月JournalofTrafficandTransportationEngineeringFeb.2009文章编号:1671-1637(2009)01-0067-06地铁双线隧道施工人工冻结水热力数值分析李双洋,张明义,黄志军,董元宏(中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000)摘要:为了准确分析地铁隧道人工冻结施工过程中的热力学状况,考虑水分迁移和冰水相变耦合影响以及水泥水化热的生成,采用热蠕变本构建立了地铁隧道人工冻结施工的水热力耦合分析模型。对广州地铁某双线隧道施工过程中的
2、热力状况进行了数值模拟,同时应用人工冻土的长期强度对冻结壁安全性进行了评估。分析结果表明:在地铁冻结法施工时,最大主应力沿着冻结管呈环形分布,并且管周围的应力明显偏高;开挖对环形应力场的影响不大,而且与其他施工方法不同,人工冻结法施工引起的地表沉降并不随开挖断面的逐渐扩大而增大,整个施工过程中的最大地表沉量仅为9.1mm,因而人工冻结法施工能有效地控制地表沉降量。关键词:隧道工程;双线隧道;人工冻结法;数值分析中图分类号:U455.49文献标志码:ANumericalanalysisofmoisture,thermalandmechanicalstatesforsubwa
3、ydouble-linetunnelconstructedbyartificialfreezingmethodLIShuang-yang,ZHANGMing-yi,HUANGZh-ijun,DONGYuan-hong(StateKeyLaboratoryofFrozenSoilEngineering,ColdandAridRegionsEnvironmentalandEngineeringResearchInstitute,ChineseAcademyofSciences,Lanzhou730000,Gansu,China)Abstract:Inordertoaccura
4、telyanalyzethethermalandmechanicalstatesofsubwaytunnelconstructedbyartificialfreezingmethod,thecoupledeffectsofmoisturetransferandphasechangeoficeandwater,thegenerationofcementhydrationheatandthermalcreepconstitutiverelationshipweretakenintoaccount,andamoisture,thermalandmechanicalcoupled
5、modelwasestablished.ThethermalandmechanicalstatesofGuangzhousubwaydouble-linetunnelconstructedbyartificialfreezingmethodweresimulated,andthesafetyoffrozenwallwasevaluatedbyusingthelong-termstrengthoffrozensoil.Analysisresultshowsthatthemaximumprincipalstressdistributescircularlyalongfreez
6、ingpipeswhenthesubwaytunnelisconstructedbyartificialfreezingmethod,andthestressaroundfreezingpipesisobviouslyhigh.Excavationhaslittleinfluenceoncircularstressfield,thesurfacesettlementcausedbyartificialfreezingconstructiondoesnptincreasewithexcavationexpansion,whichisdifferentfromothercon
7、structionmethods.Themaximumsettlementisonly911mmduringthewholeconstruction,sothesurfacesettlementcanbeeffectivelycontrolledbyartificialfreezingmethod.2tabs,5figs,11refs.Keywords:tunnelengineering;double-linetunnel;artificialfreezingmethod;numericalanalysisAuthorresu
