Publication Abstract

Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)

Prediction of bearing capacity of piles by pile dynamics
N. Kawabata; Nippon Steel Corporation, Tokyo, Japan T. Sakai; Public Works Research Institute, Ministry of Construction, Tsukuba, Ibaraki, Japan S. Kondo; Public Works Research Center, Tokyo, Japan H. Kanai; NKK Corporation, Tokyo,

A new method for prediction of the dynamic bearing capacity of piles based on the stress wave theory is presented in this paper. The theoretical background and the application of the method to measure the shaft and pile toe resistance separately are also discussed. Although the CASE method and the CAPWAP analysis are widely used as the prediction method of the bearing capacity of piles, the frequency characteristics of piles are not considered. It is not easy to measure the soil resistance during driving by the CASE method because the frequency component of the driving force by the hammer impact and that of the reflected wave of the pile are greatly different from each other. Same frequency range lower than the resonant frequency of the pile are used both for the forward and backward wave to predict the soil resistance during driving. As the results, it is found that the predicted values of pile capacities by this method presented here and the CAPWAP analysis are almost same.

 article #524; publication #37 (IC-1991-IT)