中南大学学报（自然科学版）2017，Vol.48Issue(1)：177-183,7.DOI:10.11817/j.issn.1672-7207.2017.01.025
堆载和桩顶荷载组合作用下的桩土响应分析
Analysis of pile-soil interaction under combination of pile head vertical loads and surface loads
摘要
Abstract
Negative skin friction is an important factor which affects the performance of pile foundation.As pile head load and surface load exert significant effect on the distribution of skin friction,Lagrangian difference method was used to analyze the skin friction and the variation discipline of neutral point position as well as axial stress distribution of pile to study their coupled effect.The results show that negative skin friction occurs in the range of 0.37-0.64 pile length from the pile top.When the surface load is 60 kPa or less,the negative skin friction firstly increases with the increase of depth,and then decreases,and finally changes to the positive skin friction.The surface load is greater than 60 kPa.The negative skin friction firstly decreases then changes to the positive friction.The relationship between the maximum value of pile-axial forces with surface load and pile head load is a significant duality.The variation discipline of neutral point position is affected by the combination values of surface load and pile head load.In addition,the relationship between neutral point position with pile head load and surface load can be described by a binary equation,which can be used to calculate the neutral point position.关键词
堆载/桩顶荷载/数值分析/负摩阻力/中性点Key words
surface load/pile head load/numerical analysis/negative skin friction/neutral point分类
建筑与水利引用本文复制引用
韩东亚,曹平,林杭,范文臣..堆载和桩顶荷载组合作用下的桩土响应分析[J].中南大学学报（自然科学版）,2017,48(1):177-183,7.基金项目
国家自然科学基金资助项目(51274249) （51274249）
教育部博士点基金资助项目(20120162110009) (Project(51274249) supported by the National Natural Science Foundation of China （20120162110009）
Project(20120162110009) supported by the PhD Programs of Ministry of Education of China) （20120162110009）
