顶拉抗拔桩轴向荷载-位移曲线的解析拟合方法  

Analytical fitting method for axial load-displacement curve of top-uplift piles

作　　者：杨碧莲 马海龙[1] YANG Bilian;MA Hailong(School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学建筑工程学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2021年第1期103-108,共6页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(51878618)。

摘　　要：针对顶拉抗拔桩试验的数据处理问题,采用荷载传递解析法和实测数据拟合,提出一种顶拉抗拔桩轴向荷载-位移曲线的解析拟合方法。该方法首先假定桩侧土符合双折线硬化模型,推导出一组顶拉抗拔桩在轴向荷载作用下荷载-位移曲线的解析解;然后通过实测数据,对桩侧土的传递函数曲线进行拟合,得到抗剪刚度系数、弹性极限位移等计算参数;最后利用解析解得到完整的顶拉抗拔桩荷载-位移曲线。将该解析拟合方法的计算荷载-位移曲线与实测曲线比较,两者的吻合度较高。该方法能够准确地反映顶拉抗拔桩在轴向荷载作用下的荷载-位移特性,也可用于计算层状地基中顶拉抗拔桩的荷载-位移曲线;与荷载传递位移协调法相比,无须实测各土层的传递函数,计算更加简单快捷。该方法为预测同场地不同桩径、桩长的桩基性状提供了一种理论计算手段。For the test data processing problem of top-uplift piles,the load transfer analytical method and measured data fitting were adopted,and an analytical fitting method for axial load-displacement curve of top-uplift piles was proposed.Firstly,it was assumed that the pile side soil conformed to bilinear hardening load-transfer function,and a set of analytical solutions to the load-displacement curve under axial load of top-uplift piles was deduced.Then,the transfer function curve of pile side soil was fitted through the measured data to get calculating parameters such as shear stiffness coefficient and elastic limit displacement.Finally,the complete load-displacement curve of top-uplift piles was obtained by the above analytical solutions.The calculated load-displacement curve of this method was compared with the measured curve,and the goodness of fit of both was high.This analytical fitting method can accurately reflect the load-displacement characteristics of top-uplift piles under axial load and it can also be used to calculate the load-displacement curve of top-uplift piles in layered foundations.Different from the load transfer displacement coordination method,this method does not need to measure the transfer function of each soil layer,so the process of calculation is simpler and faster.In addition,it provides a theoretical calculation method for predicting the properties of pile foundation with different pile diameters and length on the same site.

关 键 词：顶拉抗拔桩 极限承载力 荷载-位移曲线 荷载传递解析法 荷载传递位移协调法 

分 类 号：TU473.1[建筑科学—结构工程]