分层地基中扩底桩抗拔承载力的计算方法研究

›› 2008, Vol. 29 ›› Issue (7): 1997-2003.

分层地基中扩底桩抗拔承载力的计算方法研究

郦建俊^{1, 2}，黄茂松^{1, 2}，木林隆^{1, 2}，王卫东³，陈峥⁴

1.同济大学岩土及地下工程教育部重点实验室，上海 200092；2.同济大学地下建筑与工程系，上海 200092； 3.华东建筑设计研究院，上海 200002；4.华东电力设计院，上海 200063

收稿日期:2006-09-29 出版日期:2008-07-10 发布日期:2013-07-27
作者简介:郦建俊，男，1978年生，博士研究生，主要从事桩基工程与岩土数值分析方面的研究。
基金资助:
上海市科委科技攻关重点项目（No. 052112010）

Research on computation methods of uplift capacity of enlarged base pile in layered soils

LI Jian-jun^{1, 2}, HUANG Mao-song^{1, 2}, MU Lin-long^{1, 2}, WANG Wei-dong³, CHEN Zheng⁴

1.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2.Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3.East China Architectural Design & Research Institute, Shanghai 200002, China;4.East China Electric Power Design Institute, Shanghai 200063, China

Received:2006-09-29 Online:2008-07-10 Published:2013-07-27

摘要/Abstract

摘要： 采用极限平衡法，利用幂函数形式的滑移面假设，推导出扩底抗拔桩在分层地基中极限承载力的简化计算公式，并将计算结果和其他方法计算结果分别与室内模型试验和原位试桩结果作对比，分析后发现文中计算公式是几种破裂面假设及其计算公式集成的一种简化计算方法；密砂中取幂指数N=10，松砂中取N→∞的计算结果和室内模型试验结果是一致的；分层地基中的原位试桩具有明显的尺寸效应，应区分短桩(L/d<20)和中长桩(L/d>20)；文中计算方法取N→∞，在短桩的计算结果和原位试桩结果一致，在深基础中长桩则需引入分层折减系数进行修正，分层折减系数在砂土中取0.5，黏土中取0.6是合适的。

关键词: 扩底抗拔桩, 极限承载力, 极限平衡法, 分层折减系数

Abstract: A new simplified computing formula of uplift capacity of enlarged base pile in layered soils is deduced according to power law slip surface premises and based on limit equilibrium method. The comparison between theoretical predictions which is in accordance with the simplified formula and other theoretical methods and centrifuge tests and in situ test for enlarged base pile is illustrated in detail. According to the comparative analysis, the following conclusions are gained: the deduced theoretical formula is an integrated simplified method of several failure surface premises and corresponding formulas. The theoretical prediction by simplified method while power N=10 in dense sand and N→∞ in loose sand is consistent with centrifuge tests results. Short pile(L/d<20) and long pile(L/d>20) should be distinguished because in situ test has obvious measurement effect in layered soils. The simplified method is accurate for short pile while power N→∞; on the other hand, this formula needs to be revised using layered discount coefficient for long pile. It is reasonable that layered discount coefficient equals to 0.5 in sand and 0.6 in clay.

Key words: enlarged base pile, ultimate capacity, limit equilibrium method, layered discount coefficient

中图分类号:

TU 473

郦建俊，黄茂松，木林隆，王卫东，陈峥 . 分层地基中扩底桩抗拔承载力的计算方法研究[J]. , 2008, 29(7): 1997-2003.

LI Jian-jun , HUANG Mao-song , MU Lin-long , WANG Wei-dong , CHEN Zheng . Research on computation methods of uplift capacity of enlarged base pile in layered soils[J]. , 2008, 29(7): 1997-2003.

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