液化砂土地基侧向流动对群桩作用的数值分析
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摘要
强震中,液化土体在重力作用下往往发生水平流动,对群桩基础造成严重破坏。因此,液化土体流动对桩的致灾机理以及可液化土与群桩基础的动力相互作用一直是岩土地震工程领域的重要研究之一。采用三维动力FE-FD耦合法及弹塑性饱和土本构模型,对群桩—可液化土体系的振动台实验进行非线性数值模拟,通过土体振动液化后在不同侧向流速下对群桩产生致灾作用的分析,讨论并得到液化土侧向流动中孔隙水压力、流动变形、土体流速对群桩基础前后桩的内力分布和侧向位移的影响规律。
During strong earthquakes,the liquefied ground due to gravity usually leads to lateral spreading which causes serious damages of multi-pile foundations.Therefore,it is always one of the most important researches in geotechnical engineering that the disaster mechanism caused by ground flow to multi-pile and the dynamic interaction between liquefied soil and multi-pile foundation.Using the dynamic FE-FD coupled method in three-dimension and the constitutive model of elastic-plastic saturated soil,the nonlinear numerical simulation is implemented for the shaking table experiments against the system of liquefied soil-pile;the analysis is taken for the disaster action caused to piles by liquefied soil in lateral spreading ground in different velocities,and the laws of pore water pressure in lateral spreading and the influence between flow deformation and internal force,lateral displacement in piles back and forth are given and discussed.
During strong earthquakes,the liquefied ground due to gravity usually leads to lateral spreading which causes serious damages of multi-pile foundations.Therefore,it is always one of the most important researches in geotechnical engineering that the disaster mechanism caused by ground flow to multi-pile and the dynamic interaction between liquefied soil and multi-pile foundation.Using the dynamic FE-FD coupled method in three-dimension and the constitutive model of elastic-plastic saturated soil,the nonlinear numerical simulation is implemented for the shaking table experiments against the system of liquefied soil-pile;the analysis is taken for the disaster action caused to piles by liquefied soil in lateral spreading ground in different velocities,and the laws of pore water pressure in lateral spreading and the influence between flow deformation and internal force,lateral displacement in piles back and forth are given and discussed.
引文
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[2]刘立平,李英民,韩军.桩—土—结构相互作用弹塑性地震反应分析[J].世界地震工程,2004,20(3),160～165.
[3]熊辉,邹银生,许振宇.层状场域内桩—土—上部结构的整体动力有限元模拟[J].土木工程学报,2004,37(9),55～61.
[4]熊辉,邹银生.群桩(土)—承台—结构的动力相互作用分析[J].工程力学,2004,21(4),75～80.
[5]陈菊香,刘克萍,俞亚南,冯世挺.基于P—Y曲线的水平承载群桩有限元分析[J].江南大学学报,2005,4(2),163～167.
[6]苏静波,邵国建,刘宁.基于P—Y曲线法的水平受荷桩非线性有限元分析[J].岩土力学,2006,27(10),1781～1785.
[7]娄奕红,刘喜元.桩土相互作用的有限元一无界元分析[J].城市道桥与防洪,2004,2,33～36.
[8]Akai K,Tamura T.Numerical analysis of multidimensionalconsolidation accompanied with elastic-plastic constitutiveequation[C].Proceedings of the Society of Civil Engineers,1978,269(Ⅲ):95～104.
[9]Oka F,Yashima A,Shibata T,et al.FEM-FDM coupledliquefaction analysis of a porous soil using an elastic-plastic model[J].Applied Scientific Research,1994,52:209～24.
[10]Uzuoka R.Analytical study on the mechanical behavior andprediction of soil liquefaction and flow[D].Kyoto University2000.(in Janpanese)
[11]Oka F,Yashima A and Kato A,et al.A constitutive model forsand based on the non-linear kinematic hardening rule and itsapplications[C].Proceeding of 10th World Conference onEarthquake Engineering,Barcelona 1992:2529～2534.
[12]Oka F,Yashima A and Tateishi A,et al.A cyclic elastic-plasticconstitutive model for sand considering a plastic-straindependence of the shear modulus[J].Geotechnique,1999,49:661～680.
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