Journal of Shanghai Jiao Tong University ›› 2008, Vol. 42 ›› Issue (11): 1866-1870.doi: 10.16183/j.cnki.jsjtu.2008.11.025

Special Issue: 王建华教授学报发文专辑

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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


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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