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时间:2020-03-25
《软土地基高速公路路基拓宽改建全过程变形特性数值模拟.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12卷第5期铁道科学与工程学报Volume12Number52015年10月JournalofRailwayScienceandEngineeringOctober2015软土地基高速公路路基拓宽改建全过程变形特性数值模拟蒋鑫,蒋恰,梁雪娇卫,吴朝阳,邱延峻,。(1.西南交通大学土木工程学院,四川成都610031;2.西南交通大学道路工程四川省重点实验室,四川成都610031;3.西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031)摘要:为研究软土地基高速公路路基拓宽改建全过程
2、的变形特性,基于有限元数值模拟,对比分析一次性新建而成的窄路基、宽路基及拓宽改建而成的宽路基地基表面沉降、路基表面沉降及地基侧向变形等演变规律。研究结果表明:拓宽改建而成的路基较一次性新建而成的路基沉降演变过程复杂,沉降曲线形态由w型一u型一w型转变;老路基坡脚处地基侧向位移先向老路基一侧移动,再向新路基一侧移动而后又向内回缩。拓宽时应重视新老路基之间的相互作用;拓宽路基除应控制工后沉降外,同时应注意适当控制新路基施工期老路基的沉降及差异沉降。所获结论有助于工程实际沉降控制指标体系的合理确定、软
3、基处治对策的科学选择。关键词:软土地基;路基拓宽;变形特性;相互作用;有限单元法中图分类号:U418.8文献标志码:A文章编号:1672—7029(2015)05—1039—08NumericaIsimulationondeformationbehaviorsforwidenedexpresswayembankmentoversoftgroundJIANGXin',JIANGYi,,LIANGXuejiao,,WUChaoyang’,QIUYanjun,,(1.SchoolofCivilEngi
4、neering,SouthwestJiaotongUniversity,Chengdu610031,China;2.KeyLaboratoryofHighwayEngineeringofSichuanProvince,SouthwestJiaotongUniversity,Chengdu610031,China;3.MOEKeyLaboratoryofHigh—speedRailwayEngineering,SouthwestJiaotongUniversity,Chengdu610031,Ch
5、ina)Abstract:Inordertostudythedeformationbehaviorsofexpresswayembankmentoversoftgroundduringthewholewideningprocess,numericalmodelsofnewlybuiltna~owembankment,newlybuiltwideembankmentandwidenedembankmentwereestablishedbasedonthefiniteelementnumerical
6、simulation.Thedevelopmentsofgroundsurfacesettlement,embankmentsurfacesettlementandgroundlateraldisplacementofeachmodelwerecomparedandanalyzed.Theresultsshowthatwidenedembankment’Sdeformationbehaviorsaremuchmorecomplicatedthanthoseofnewlybuiltembankme
7、nt,andthesettlementcurveofwidenedembankmentwillchangefromW—type,toU—type,thentoW—type.Thegroundundertheoldembankmenttoelateraldisplacementmovestothesideofoldembankment.andthentothesideofnewembankmentandlaterretracts.Theinteractionbetweenoldandnewemba
8、nkmentshouldbetakenseriously.Notonlythepost—constructionsettlementshouldbecontrolled,butalsothesettlementanddifferentialsettlementofoldembankmentduringthenewembankmentconstructionshouldbefocusedon.Theseconclusionswillbebenefitinthedeterminationofthes
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