市政技术2024，Vol.42Issue(4)：54-61,77,9.DOI:10.19922/j.1009-7767.2024.04.054
长径比与桩侧土体模量变化对灌注桩竖向承载特性影响分析
Effects of Pile Length-Diameter Ratio and Soil Modulus on the Vertical Bearing Characteristics of Filling Piles
摘要
Abstract
In order to study the influence of length-diameter(L/D)ratio and the weakening effect of elastic modulus of soil body on the pile side caused by the process of pile hole formation and excavation on the bearing characteris-tics of pile foundation,15 sets of vertically loaded mono-pile were conducted by numerical analysis in this paper to analyze the characteristics of load-settlement curve at the top of the pile,the change curve of the pile axial force and the load-settlement curve at the end of the pile.The results show that the vertical displacement at the top of the pile decreases with the increase of pile diameter under the same pile length and vertical load at the top of the pile.Under the same vertical displacement at the top of the pile,the vertical load at the top of pile increases with the increase of pile length;Under the same pile diameter and vertical load at the top of the pile,the vertical displacement at the top of the pile decreases with the increase of the pile diameter.Under the same vertical displacement at the top of the pile,the vertical load at the top of the pile increases with the increase of the pile diameter.There is a critical L/D ratio that maximizes the influence of the percentage of resistance exerted at the end of the pile and the change rate of vertical displacement at the top of the pile.When the elasticity modulus of soil body on the pile side is greater than a certain value,the effect of the modulus change on the pile foundation bearing characteristics can be neglected;With the decrease of elasticity modulus of soil body on the pile side to a certain value,the position where the resistance on pile side is off working gradually shifts upward.关键词
桩基承载特性/长径比/弹性模量/荷载-沉降曲线/数值模拟Key words
bearing characteristics of the pile foundation/length-diameter(L/D)ratio/elasticity modulus/load-settlement curve/numerical simulation分类
土木建筑引用本文复制引用
许白杨,杨珂,范金海,施文辉,吴悦..长径比与桩侧土体模量变化对灌注桩竖向承载特性影响分析[J].市政技术,2024,42(4):54-61,77,9.基金项目
中国博士后科学基金(2023MD734112) （2023MD734112）
