【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。更多还原

【Abstract】 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.更多还原