铁道科学与工程学报Issue(5)：1032-1038,7.
考虑侧阻增强效应的基桩极限承载力解析算法
Analytical method of ultimate bearing capacity of pile considering enhance ment effect in lateral resistance
摘要
Abstract
Shaft resistance enhancement effect of pile due to the increasing of tip resistance is hard to be consid-ered in conventional method of vertical bearing capacity.Firstly,the mechanism of shaft resistance enhancement effect is analyzed deeply in the paper.On this basis,logarithmic spiral line of Meyerhof is adopted to simulate the failure modes of soil below pile tips,and upper -bound method of limit analysis is introduced to analyze the energy transfer laws of soil below and around piles.Therefore,the incremental normal stress along pile is de-duced with the principle of virtual work.The ultimate axial bearing capacity of pile is also obtained by taking the shaft resistance enhancement effect into consideration via Mohr -Coulomb theory.Comparison of calculated val-ues to field data shows that the present method was more reasonable in predicting bearing capacity of pile,and the conventional method underestimates the bearing capacity of pile.Finally,several key parameters relating to shaft resistance enhancement effect are analyzed,and the result shows that shaft resistance enhancement effect would be even more obvious with the increase of soil strength under pile tip and pile diameter.This conclusion could provide a reference to engineering practice.关键词
桩基础/侧阻增强/强化效应/极限上限法/极限承载力Key words
pile foundation/shaft resistance enhancement/enhancement effect/upper bound limit method/ulti-mate bearing capacity分类
建筑与水利引用本文复制引用
杨明辉,李军,赵明华..考虑侧阻增强效应的基桩极限承载力解析算法[J].铁道科学与工程学报,2015,(5):1032-1038,7.基金项目
国家自然科学基金资助项目（51278184，50708030）；教育部新世纪优秀人才支持计划项目（NCET －13－194）；湖南大学青年教师成长资助项目 （）
