上海交通大学学报 ›› 2008, Vol. 42 ›› Issue (11): 1866-1870.doi: 10.16183/j.cnki.jsjtu.2008.11.025

所属专题: 王建华教授学报发文专辑

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桩基荷载传递参数的统计特性

孙波, 张璐璐, 王建华()   

  1. 上海交通大学土木工程系,上海  200030
  • 收稿日期:2007-11-28 出版日期:2008-11-01 发布日期:2008-11-28
  • 作者简介:孙波(1982-),男,重庆市人,硕士生,主要从事桩基础承载力研究.|王建华(联系人),男,教授,博士生导师,电话(Tel.):021-62932915;E-mail:wjh417@sjtu.edu.cn.
  • 基金资助:
    国家自然科学基金资助项目(50679041)

Uncertainties of Piles Load Transfer Parameters

SUN Bo, ZHANG Lu-lu, WANG Jian-hua()   

  1. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200030, China
  • Received:2007-11-28 Online:2008-11-01 Published:2008-11-28

摘要:

针对工程中常用的双曲线荷载传递函数,以上海地区不同场地的7根有实测桩身轴力分布的试桩资料、12根无实测轴力分布的单桩静载荷试验以及上海青浦某场地75根工程桩试桩资料为基础,对荷载传递函数参数ab取值进行统计分析,研究了在不同土层中桩基荷载传递参数的变异性.研究表明,参数ab反分析所得的均值与实测值较为接近,ab之间呈负相关.相比地基土的常规物理力学性质指标,荷载传递参数ab的离散度较大.柯尔莫哥洛夫-斯米诺夫(Kolmogorov-Smirnov, K-S)检验的结果表明,参数ab不拒绝正态分布.

关键词: 荷载传递函数, 反分析, 统计分析

Abstract:

The load-transfer method (t-z method) is easy to calculate and can be used in design practice. The most important thing of using the t-z method is the determination of the load-transfer parameters. The uncertainties of the two parameters in the hyperbolic load-transfer function of pile foundation were investigated. Data of seven static load tests with strain gauges, twelve static load tests without strain gauges together with 75 load tests at a single site in Shanghai were collected. Statistical analyses were conducted for both measured and back-calculated parameters for different soil layers. It was found that the uncertainties of the back-calculated values are close to those of the measured ones. The parameters a and b are negatively correlated. Compared with basic soil properties such as unit weight and shear strength parameters, the COVs of the load transfer parameters are greater. According to the Kolmogorov-Smirnov (K-S) test at a significance level of 5%, the normal distribution for both parameters can not be rejected.

Key words: load transfer function, back analysis, statistical analysis

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