【摘要】 基于动力Biot理论将饱和砂土模拟为两相介质,正确考虑水和土颗粒之间变形关系,采用完全耦合u-p有限元公式模拟土体位移和孔压,选用多屈服面弹-塑性本构模型模拟黏土、砂土,砂层划分为20-8节点六面体单元,桩处理为梁-柱单元,建立三维有效应力振动台试验分析模型。通过振动台试验结果,验证该模型的正确性,显示该方法能够准确地模拟可液化场地桩-土-结构动力相互用的重要特征,这对于实际工程设计具有一定的参考意义。更多还原

【Abstract】 Based on Biot’s dynamic coupled theory,the saturated sand simulated as the two phase medium considering the interaction of fluid and soil skeleton deformation.A fully coupled dynamic finite element formulation(u-p) is used to model soil displacement and pore pressure.The clay and saturated sand are simulated by multi-yield surfaces elasto-plastic constitutive model.The sand layer domains are discretized using solid-fluid fully coupled(u-p) 20-8 node brick elements while the pile is considered as the beam-column element.Three-dimensional numerical model is established for shaking table test based on the nonlinear effective stress.The results of shaking table test verified the validity and effectiveness of numerical model and showed the numerical procedure can simulate the fundamental aspects of dynamic soil-pile-structure interaction,which will have very important significance for engineering design.更多还原