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中文摘要：
软土的非线性特性及上部荷载作用下地基的固结效应对上部结构内力分布及桩筏基础变形往往具有不容忽视的影响。不考虑上部结构刚度影响的共同作用分析常规设计方法与二维简化方法尚未全面地反映共同作用体系的实际工作机理。为此基于Biot固结理论，考虑地基土的弹塑性特性，对上部结构-桩筏基础-地基共同作用体系的时间效应进行了三维有限元数值分析。结果表明：地基的固结效应对共同作用体系的承载机理与变形协调能力具有显著的影响，共同作用体系的工作性能紧密地依赖于超孔隙水压力随时间的变化特征。同时上部结构刚度对共同作用体系的时间效应也具有不可忽视的影响。因此，在共同作用体系分析中应合理地考虑结构刚度效应和地基固结的时间效应。
英文摘要：
In coastal areas, piled raft foundations are widely employed for high-rise or multi-rise structures. Under such conditions, the effect of consolidation of soft soil ground on the interaction between piled rafts and foundation as well as superstructures can not be overlooked. Furthermore, both conventional methods of structural design and numerical procedures of two-dimensional interaction analysis can not realistically simulate the mechanism of interaction system without considering effect of superstructure stiffness. In order to well understand long-term behaviour of the interaction system, nonlinear deformation and strength behaviour of foundation soils were taken into account by using the elasto-plastic constitutive model based on Mohr-Coulomb＇s yield criterion while the consolidation effect of subsoil under loading was incorporated by numerically solving Biot＇s equations of consolidation in FEM formulations. Based on a case study for a given typical interaction system and comparative analysis for different cases, the features of variation of internal forces, settlement and compatibility mechanism of interaction system with time were examined. It was shown that both the consolidation characteristics of foundation and the superstructure stiffness remarkably affected time-dependent performance of the interaction system. Such dependency was intimately related to variation of excess pore water pressure of subsoil. It was indicated that both the effect of consolidation of subsoil and the superstructure stiffness on interaction behavior should be take into account in coupling analysis of superstructure-piled raft-foundation in order to well estimate the internal forces and deformations.
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