摘要
本文首次建立了一个分析桩-土-筏片体系共同作用的三维非线性有限元、棱柱元综合计算模型.主要特点是:1.引入“广义位移”概念以减少基本未知量的数目;2.由实验e-p曲线直接反映土壤的非线性性质;3.对分层分片的复杂地质条件,任意布柱形式均方便适用;4.建立无界元以考虑远场土的影响;5.用中厚板、深梁理论建立筏片刚度矩阵;6.利用分块迭代法对Winkler地基板的解进行逐步修正,以逼近桩-土地基板的真解;7.可在指定位移条件下求解,以研究与邻近建筑沉降差的影响.
This paper presents a new 3-dimensional non-linear model for analysing the interaction of raft-pile-soil systems. This model couples finite elements with prism elements and calcu-lates with reasonable accuracy the settlement of a pile group, the bending moments and shear forces of the raft under vertical loads.There are seven main characteristics of this model:(1) The concept of generalized displacement is introduced in this model to reduce the number of the foundamental unknowns. (2) The void ratio-pressure curves of the soil are first used in the constitutive equations to consider the non-linear properties of the soil. (3) This method is suitable for any complicated soil, such as stratified soil, or non-homogeneous soil, and for any form of a pile arrangement and for any form of a raft, including different thickness. (4) The finite element is first used to analyse the pile-soil systems and a new infinite prism element is presented in this model to consider the effect of the far field soil. (5) The Reissner's medium thickness plate theory and the Timoshenko's shear beam theory are used to analyse the raft. (6) Satisfactory approximation can be obtained by iterative method. (7) The effect from nearby buildings can be considered in this model.
出处
《土木工程学报》
EI
CSCD
北大核心
1998年第3期30-40,共11页
China Civil Engineering Journal
关键词
桩-土-筏片基础
共同作用
三维非线性
弹性力学
raft-pile-soil foundation, interaction, non-linear soil, non-homogeneous soil, finite element, prism element, medium thickness plate, iterative method.
