岩土力学2013，Vol.34Issue(3)：621-630,10.
考虑应力扩散时桩端土性对单桩沉降影响分析方法
A new method for analyzing influence of pile tip soil properties on single pile settlement considering stress dispersion
摘要
Abstract
Based on virtual soil-pile model, the influence analysis of pile tip soil properties on single pile settlement is conducted in terms of layered soils. Firstly, considering stress dispersion in soil medium, the soil between pile tip and bedrock surface is assumed to be virtual soil-pile. Furthermore, the virtual soil-pile with variable cross-section is divided into finite segments. Then, the surrounding soil layers of pile is modeled as ideal elastoplastic transfer model; and regarding the developmental plastic depth as an independent variable, a recursive method for calculating axial force and side friction of pile in layered soil is derived by load transfer method. On this basis, parameters selection of load transfer model is studied; meanwhile, the factors of virtual soil-pile length and the feasibility of acquiring stress dispersion angle through inversion analysis are analyzed. Finally, by means of the presented method, the difference of load-displacement curves has been examined when pile bottom sediment and soft substratum exist. The results show that: the calculated load-displacement curves of pile tip and pile top agree well with the measured curves considering stress dispersion of pile tip soil; the presented method can take the influences of pile bottom sediment and soft substratum on load-displacement curves into consideration.关键词
单桩沉降特性/虚土桩模型/荷载传递法/应力扩散/桩端沉渣/软弱下卧层Key words
settlement characteristics of single pile/ virtual soil-pile model/ load transfer method/ stress dispersion/ pile bottom sediment/ soft substratum分类
建筑与水利引用本文复制引用
王奎华,吕述晖,吴文兵,罗永健,武登辉..考虑应力扩散时桩端土性对单桩沉降影响分析方法[J].岩土力学,2013,34(3):621-630,10.基金项目
国家自然科学基金资助项目(No.50879077). （No.50879077）
