Abstract
Dynamic methods of load testing driven piles and bored shafts are in common use throughout the united states and europe. The complexequations and computer programs used to analyze the data from such tests might lead to the assumption that the results are equally precise. In fact, little is known or has been published about the absolute accuracy of such methods. The potential sources of error that mayexist in all phases of the operation, from data collection to correlation with static load tests, are described. The differences between the classical case method and the simbat technique are discussed. This paper appears in transportation research record no. 1331, Integrity testing of foundations 1991