饱和土中管桩的水平动阻抗研究

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1、第35卷第5期岩土力学Vol.35No.52014年5月RockandSoilMechanicsMay2014文章编号：1000－7598(2014)05－1348－09饱和土中管桩的水平动阻抗研究刘林超，闫启方（信阳师范学院土木工程学院，河南信阳464000）摘要：为了考察桩、土主要参数对饱和土中管桩水平振动的影响，将土体分为桩周饱和土和桩芯饱和土两部分，利用多孔介质理论的饱和土控制方程建立了饱和土-管桩的耦合振动模型。在考虑桩周饱和土和桩芯饱和土边界条件的情况下，运用势函数解耦的方法对桩周饱和土和桩芯饱和土的水平振动进行了求解。在考虑桩周饱和土和桩芯饱和土对管桩作用的情况下对

2、饱和土中管桩的水平振动进行了求解，得到了管桩桩顶的水平动力阻抗，并分析了主要桩、土参数对管桩水平动力阻抗的影响。研究表明：管桩内外半径、桩周土和桩芯土剪切模量比、泊松比之比对管桩水平动力阻抗的影响较大，低频时液-固耦合系数比对管桩水平动力阻抗有一定的影响，而阻尼比之比对管桩水平动力阻抗阻尼因子有一定的影响。关键词：饱和土；管桩；水平振动；动力阻抗；剪切模量中图分类号：TU435文献标识码：AStudyoflateraldynamicimpedanceofpipepileinsaturatedsoilLIULin-chao,YANQi-fang(SchoolofCivilEngin

3、eering,XinyangNormalUniversity,464000,Xinyang,HenanChina)Abstract:Inordertoinvestigatetheinfluenceofmainparametersofpileandsoilonthelateralvibrationofpipepileinsaturatedsoil,thesoilisdividedintosaturatedsoilaroundpileandinnerpilesaturatedsoil,andcouplingdynamicmodelofthesaturatedsoil-pipepile

4、isestablishedbyusingthecontrolequationsoftheoryofporousmedium.Byconsideringtheboundariesofsaturatedsoilaroundpileandinnerpilesaturatedsoil,thelateralvibrationsofsaturatedsoilaroundpileandinnerpilecoresaturatedsoilaresolvedwiththeuncouplingmethodofpotentialfunction.Thehorizontalvibrationofpipe

5、pileinsaturatedsoilisalsosolvedbyconsideringtheforcesofsaturatedsoilaroundpileandinnerpilesaturatedsoilactingonpipepile,andthelateraldynamicimpedanceofthepipepileatpileheadisobtained;theinfluenceofmainparametersonthelateralvibrationofpipepileinsaturatedsoilisalsoanalyzed.Theresearchresultsind

6、icatethattheinfluenceoftheinnerandouterradiiofpipepile,shearmodulusratio,Poisson’ratioofpilearoundsaturatedsoilandpilecoresaturatedsoilonthelateraldynamicimpedanceofpipepileinsaturatedsoilisgreat;fluid-solidcoefficientratiohasacertaininfluenceonlateraldynamicimpedanceatlowfrequency;andtherati

7、oofdampingratiohasacertaininfluenceonthedampingfactoroflateraldynamicimpedance.Keywords:saturatedsoil;pipepile;lateralvibration;dynamicimpedance;shearmodulus薄壁管桩和预应力高强混凝土管桩。在风荷载、地1引言震荷载、动力机器荷载、高速列车荷载等荷载的作桩基作为一种重要的基础形式，在工程中得到用下，管桩将承受竖向、水平或扭转等动