黏性土填土蠕变对土工合成材料加筋土挡土墙响应的影响
1王向余，2刘华北3宋二祥
(1.清华大学土木工程系，北京2.清华大学结构工程与振动教育部重点实验室，北京)
摘要:对黏性土填土的加筋土档土墙进行了蠕变有限元分析，研究了填土蠕变大小对墙体的影响，探讨了填土与筋材蠕变的相互作用机理。研究结果表明:当填土蠕变率大于筋材蠕变率时，筋材在墙体建成后拉力将会持续增大，并不表现应力松弛;随着填土蠕变率增大，墙体水平位移及筋材应变和拉力会随之增大，并且蠕变时间越长，这种增大效应越明显;目前实际设计方法中对填土蠕变影响的考虑不足，是偏于不安全的。
关键词:道路工程;加筋土档土墙;有限元分析;蠕变;土工合成材料;标准固体模型

InfluencesofCreePofCohesiveBack一fllledsoilsonResPonseof Ge os yn th eti c一r ei nforcedsoiIRetainingwalls
WANGXiang一yul·2，LIUHua一bei‘，2，SONGE卜xiangl，2(1.DePartmentofCivilEngineering，TsinghuaUniversity，Beijing100084，China;2.KeyLaboratoryof
StructuralEngineeringandVibrationofMinistryofEducation，TsinghuaUniversity，Beijingl00084，China)
Abstract:Basedon thefiniteelementanalysisofcreep behaviorofcohesiveback一filled
geosynthetic一reinforcedsoilretainingwalls，theinfluencesofthecreepofback一filledsoilson
retainingwallwerediscussedandthecreepinteractionmechanismbetweenback一filledsoilsand
reinforcementmaterialwereinvestigated.Itisfoundthatwhenthecreeprateofback一filledsoils
islargerthanthatofreinforcementmaterial，thetensioninthereinforcementmaterialwill
increasecontinuouslyratherthanrelaxafterthewallisconstructed.Thelateraldisplacementof
thewall，thestressandtensioninthereinforcementmaterialincreaseasthecreeprateofthe
back-filledsoilincreases;theeffectismoreremarkablewiththeincreaseofcreePtime.
However，currentdesignmethodsdonotproPerlytakeintoaccounttheadverseeffectsofbackfilledsoilcreepwhichmaybeunsafe.
Keywords:roadengineering;reinforcedsoilretainingwall;finiteelementanalysis;creeP;geosynthetics;
standardsolidmodel
0 引言
近些年来，许多工程已经采用薪性土作为土工合成材料加筋土挡土墙的填土材料，而翻性土和土工合成材料都有较明显的蠕变特性，它会引起墙体的内力重分配和位移增大，甚至导致墙体破坏。

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