不同桩长、桩径桩筏基础的分析方法

针对具有不同桩长、桩径群桩的桩筏基础进行研究,采用筏基无单元方法对筏板进行模拟,基于共同作用原理,以桩与桩、桩与土相互作用的解析模型为基础,建立了层状地基上不同桩长、桩径、桩体材料情况下,桩筏基础与地基共同作用的一种分析方法。旨在解决具有特殊桩群,或通过桩长、桩径、桩体材料的变化、优化桩土刚度分布、调平设计时的桩筏基础计算问题。该方法可方便地用于非均匀布桩、非规则平面形状桩筏基础的计算和优化分析。与基于实际工程的大型模型试验结果的比较表明,该方法是合理可行的,并具有较好的实用性。

Analysis of piled raft foundation with different lengths and diameters of piles

A piled raft foundation with different lengths and diameters of piles was studied. On the basis of the interaction principle, a method to analyze the piled raft foundation with different lengths and diameters of piles in the layered ground was established. The element-free method was applied to the computation of the raft; and the approximate analytical model of pile-to-pile interaction was used to analyze the pile-soil system of the foundation. The purpose was to solve the computation problem of the piled raft foundation with special pile group where the stiffness of pile and soil was optimized to reduce the differential settlement by changing the pile length and diameter. In addition, the analysis of the pried raft foundation with irregular shape of raft and the optimization of pile-layout could be easily carded out. It was shown by a practical example that the calculated results were identical well to the results of the large-scale model test, so the method is rational and feasible.