论文部分内容阅读
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。
In strong earthquakes, the liquefied soil often flows horizontally under the action of gravity, causing serious damage to the pile foundation. Therefore, the mechanism of liquefiable soil flow to piles and the dynamic interaction between liquefiable soil and pile foundation are always one of the important researches in geotechnical engineering. The three-dimensional dynamic FE-FD coupling method and elasto-plastic saturated soil constitutive model were used to simulate the shaking table experiment of pile group-liquefiable soil system. After the liquefaction of the soil under different lateral flow rates, The effects of pore water pressure, flow deformation and soil velocity on the internal force distribution and lateral displacement of pile groups before and after pile foundation are analyzed and discussed.