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时间:2020-05-20
《高地热大埋深环境隧道支护结构受力分析-论文.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、第49卷第2期西南交通大学学报Vol.49No.22014年4月JOURNALOFSOUTHWESTJIAOTONGUNIVERSITYApr.2014文章编号:02582724(2014)02026008DOI:10.3969/j.issn.02582724.2014.02.012高地热大埋深环境隧道支护结构受力分析王玉锁1,22122叶跃忠,杨超,唐建辉,陈龙,曾宏飞(1.西南交通大学峨眉校区,四川峨眉山614202;2.西南交通大学土木工程学院,四川成都610031)摘要:为了研究高地热大埋深环境下隧道支护结构内力随周围介质温度变
2、化的规律,设计了测试不同温度环境条件下隧道模型结构受力的室内模型试验,并对模型试验进行了数值模拟分析.模型试验测得的轴力比数值模拟结果大20%,两者的轴力分布趋势相同,结构安全系数接近.以某隧道工程为例,用数值模拟方法分析了埋深为1000m、地热温度为60℃的环境条件下,隔热层设置对隧道支护结构体系受力特征及安全性的影响,结果表明:隔热层的设置对支护结构内力分布形式、初支和混凝土模筑支护结构内力的影响较小,但对二次衬砌受力有显著改善作用,设隔热层后二次衬砌的最小安全系数由2.0提高到4.0.关键词:隧道;高地热;热固耦合;数值模拟中图分类号:
3、U455文献标志码:AStressMechanismofLiningStructureofHighGeothermalandDeepBuriedTunnel122122WANGYusuo,YEYuezhong,YANGChao,TANGJianhui,CHENLong,ZENGHongfei(1.EmeiBranchofSouthwestJiaotongUniversity,Emeishan614202,China;2.SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu61
4、0031,China)Abstract:Tostudythebehaviorofstressvaryingwiththeambienttemperatureinliningstructuresofhighgeothermalanddeepburiedtunnels,alaboratorymodeltestwasdesignedtomeasurethestructuralstressofatunnelmodelatvarioustemperatures.Then,anumericalsimulationanalysisofthemodeltes
5、twasconducted.Acomparisonofthetwogroupsofdatarevealedthattheaxialforcevaluesobtainedbymodeltestwereapproximately20%largerthanthesimulatedvalues,buttheirdistributiontrendaresimilar,andthestructuralsafetyfactorswereapproximatelyequal.Takingatunnelingprojectasanexample,thenumer
6、icalsimulationmethodwasadoptedtoanalyzetheeffectofinsulatinglayeronthestresscharacteristicsandsafetyofthetunnelliningstructureat60℃underaburieddepthof1000m.Theresultsshowthattheinsulatinglayerhasasmalleffectonboththeinternalforcedistributionpatternofthesupportingstructureand
7、theinternalforceoftheprimaryliningandthecastconcretelining.Theinsultinglayer,however,canremarkablyimprovethestressstateofthesecondarylining,andtheminimumsafetyfactorofthetunnelssecondaryliningstructureincreasesfrom2.0withoutainsultinglayerto4.0whentheinsultinglayerisset.Key
8、words:tunnel;highgeothermal;thermosolidcoupling;numericalsimulation随着我国交通事
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