多层土中桩的极限侧摩阻力值反演分析研究  

Inversion Analysis of Ultimate Lateral Friction Resistance of Multi-layer Soil Pile

作　　者：李代锋 刘克文 陈安[1] 李廷雄 LI Daifeng;LIU Kewen;CHEN An;LI Tingxiong(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Yunnan Construction Investment First Survey and Design Co.,Ltd.,Kunming 650021,Yunnan,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]云南建投第一勘察设计有限公司,云南昆明650021

出　　处：《水力发电》2022年第9期40-44,共5页Water Power

摘　　要：为研究由桩的荷载-沉降(Q-s)曲线确定单桩侧摩阻力,通过静载荷试验和数学分析的方法,研究在已知静载试验结果的情况下,用线性最小二乘法反演桩周各土层的极限侧摩阻力,并利用有限元法对桩基沉降、极限摩阻力和桩端阻力进行分析。结果表明,由线性最小二乘法计算所得多层土中桩的极限侧摩阻力值为单桩极限承载力值的53%~66%,比有限元法偏大约23%,单桩极限侧摩阻力值为单桩极限承载力值的40.3%;2种方法的计算结果与静载试验的Q-s曲线呈现的变化规律一致,说明线性最小二乘法可满足多层土中桩的极限侧摩阻力值反演预测的要求。In order to study the determination of lateral friction resistance of a single pile from the load-settlement(Q-s)curve of pile,the linear least squares method is used to invert the ultimate lateral friction resistance of each soil layer through the static load test and mathematical analysis method when the static load test results are known,and the pile foundation settlement,ultimate friction resistance and pile tip resistance are analyzed by the finite element method.The results show that,(a)the ultimate lateral friction resistance of pile in multi-layer soil calculated by the linear least squares method is 53%to 66%of the ultimate bearing capacity of the single pile,which is about 23%higher than that of the finite element method,and the value of ultimate lateral friction resistance is 40.3%of the ultimate bearing capacity of the single pile;and(b)the calculation results of the two methods are consistent with the change law presented by the Q-s curve of static load test,indicating that the linear least squares method can meet the requirements of inversion and prediction of the ultimate lateral friction resistance value of piles in multi-layer soil.

关 键 词：桩基础 侧摩阻力 反演分析 有限元分析 静载试验 

分 类 号：TU473.1[建筑科学—结构工程]