桩基软弱下卧层承载力验算方法分析
摘要:桩基软弱下卧层承载力验算是桩基础设计的重要内容之一,对《建筑桩基技术规范》JGJ 94-94及JGJ 94-2008中关于桩基软弱下卧层承载力验算方法进行了对比分析。考虑了承台上土自重以及群桩实体基础侧摩阻力取值对验算结果的影响,认为两版规范中关于软弱下卧层顶面附加应力的计算均有不当之处。提出了以下建议:前者较适合于没有地下室的柱下群桩基础,后者则较适用于有地下室的桩-箱(筏)基础;计算附加应力时所扣除的群桩实体基础的侧摩阻力应取特征值。
Abstract:Checking for the bearing capacity of underlying weak layer is an important item in pile foundation desigru The different methods which are suggested in Technical Code for Building Pile Foundations JGJ 94-1994 and JGJ 94-2008 are comparatively analyzed. The self weight of soil above cap and the shaft resistance around the pile group are analyzed. Deficiencies of the methods are found in the two codes, some suggestions are put forward:the former is fit for small-scale pile foundation without basement while the latter is fit for piled box(raft) foundation with basement, the shaft resistance around the pile group should use the characteristic value when calculate the additional stress.
中文标题：
桩基软弱下卧层承载力验算方法分析
Analysis of Methods for Checking Bearing Capacity of Underlying Weak Layer in Pile Foundation Design
作者：
雷丰浩1,田敬贤2,王成华1
Lei Fenghao1,Tian Jingxian2,Wang Chenghua1
作者简介:雷丰浩,1989年生,男,汉族,河南洛阳人,硕士研究生。研究方向:深基础。E-mail:leifh1989@163.com
通讯地址：
1. 天津大学建筑工程学院, 天津 300072; 2. 河北工业大学校园规划处, 天津 300401
1.SchoolofCivilEngineering,TianjinUniversity,Tianjin300072,China; 2.DepartmentofCampusPlanning.HebeiUniversityofTechnology,Tianjin300401,China
中图分类号:TU431
doi:10.3969/j.issn.1007-2993.2013.01.001
出版物：岩土工程技术
收稿日期:2012-10-12
关键词:桩基础,软弱下卧层,承载力,自重应力,侧摩阻力
Key words:pile foundation,underlying weak layer,bearing capacity,self-weight stress,shaft resistance
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基金项目：
基金项目: 国家自然科学基金项目(50978182)
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