软土中单侧边载作用下桩基负摩阻力研究  

Numerical simulation analysis of negative friction of pile foundation with unilateral side load in soft soil layer

作　　者：谷复光[1] 吴天成 GU Fu-guang;WU Tian-cheng(School of surveying,mapping and exploration engineering,Jilin Jianzhu university,Changchun 130118,China)

机构地区：[1]吉林建筑大学测绘与勘查工程学院,长春130118

出　　处：《吉林建筑大学学报》2024年第1期56-60,共5页Journal of Jilin Jianzhu University

基　　金：吉林省教育厅科学技术项目(JJKH20220282KJ).

摘　　要：软土中因土体压缩性较高,在边载状况下易产生桩基负摩阻力,从而对工程产生安全隐患。本文通过有限元法对软土中受边载作用的桩基础所受到的桩基负摩阻力进行数值模拟,分析了不同边载等级、不同边载位距对软土中桩基负摩阻力、中性点位置和桩身轴力的影响。结果表明,在边载等级增加时,软土中桩身轴力有明显上升趋势,并随桩体埋深增加呈非线性趋势增长,而桩基负摩阻力随深度变化呈现非线性减小的趋势,桩体的下拉力增加,边载效应增强;同等级边载效应时,当边载与桩基之间的距离增加时,软土中桩基负摩阻力逐渐减小,中性点位置位于桩体靠近底部位置处,并随边载位置改变而受到一定影响。Due to the high compressibility of soil in soft soil,the negative friction resistance of pile foundation is easy to be generated under the condition of side load,which will cause safety hazards to the project.By means of finite element method,the negative friction resistance of pile foundation subjected to side load in soft soil is numerically simulated,and the influence of different side load grades and side load position distances on negative friction resistance,neutral position and axial force of pile in soft soil is analyzed,studies have shown that as the edge load level increases,the axial stress of pile in soft soil is on the rise,The negative frictional resistance of pile foundation tends to increase nonlinearly with the increase of pile depth,while the negative frictional resistance of pile foundation tends to decrease nonlinearly with the change of depth.The lower tension of pile increases and the side load effect increases.At the same level of side load effect,when the distance between side load and pile foundation increases,the negative frictional resistance of pile foundation in soft soil will gradually decrease;the location of neutral point is located at the location of pile body near the bottom position,and is affected to some extent with the change of side load location.

关 键 词：软土 边载效应 桩基负摩阻力 桩身轴力 

分 类 号：TU473[建筑科学—结构工程]