摘要
考虑到路堤荷载下水泥土桩复合地基变形特性,假设了桩间土竖向变形模式,在此基础上,根据弹性力学基本原理,推导得到了水泥土桩复合地基桩身轴力与桩侧摩阻力的解析表达式。理论分析和有限元计算表明,路堤下复合地基桩身出现中性点,中性点以上产生负摩阻力;桩侧正、负摩阻力以及桩身轴力随桩体模量增加或土体模量减小而增加,随桩顶荷载增加而增加。理论计算结果与有限元计算结果比较一致。推导的桩身轴力与桩侧摩阻力解析表达式可为工程应用参考。
In consideration of deformation characteristics of soil- cement pile composite foundation under embankment, based on the supposed vertical settlement mode of the soil between piles and the elastic mechanics principle, the analytical formulas of the vertical stress of the pile and the friction of the pile side were derived. Theoretical analysis and FEM calculation results indicate that （1） the neutral point of the pile in composite foundation under embankment is produced, the negative friction of the pile side is also produced above the neutral point; （2） the positive and the negative frictions of the pile side and the vertical stress of the pile increase with increment of the modulus of the pile and reduction of the modulus of the soil between piles, and they increase with increment of the load at the top of the pile. Theoretical results agree with FEM calculation results. The analytical formulas could be used for engineering reference.
出处
《公路交通科技》
CAS
CSCD
北大核心
2010年第2期30-35,共6页
Journal of Highway and Transportation Research and Development
基金
苏州市科技局项目资助(SZD0799)
关键词
道路工程
路堤
荷载传递规律
理论分析
水泥土桩
复合地基
road engineering
embankment
load transfer law
theoretical analysis
soil- cement pile
composite foundation
