Proceedings - Second International Conference - Piling and Deep Foundations, 1987, Luxembourg, (DFI)
Analysis of Vibratory Driven Pile
Sherril Gardner; Naval Civil Engineering Laboratory, Port Hueneme, California
Vibratory drivers have been used since the 1930's to drive and extract piles. Vibratory pile drivers have the capability of significantly decreasing pile installation time, especially in granual type soils. However, they have not been widely accepted because of the uncertainty in estimating the bearing capacity of the driven pile. When driving bearing pile, the industry standard method for obtaining load carrying capacity of a pile installed with a vibratory driver is to redrive with an impact hammer. The advantage of improved productivity is lost with the redrive procedure. Currently, there is no other method to predict the capacity of these bearing piles installed with a vibratory driver. The Naval Civil Engineering Laboratory (NCEL) is making progress towards being able to estimate the bearing capacity of these piles. This paper describes field testing and corresponding analytical modeling of the vibratory driver-pile-soil system. The following sections describe the development of the numerical model and techniques for collecting field data. A discussion of the prediction of the pile driving process based on field test data is followed by suggestions as to the additional work that should by done to further verify the model to a point where it can by used with confidence.
|article #594; publication #40 (IC-1987)|