Until recently, predicting the increase in soil resistance during pile driving due to short or lengthy delays was unfeasible. It has often relied on experience and judgement Estimating the hammer efficiency for theoretical wave equation studies was disputable. Dynamic measurements performed on piles during pile driving produced a wide varying range of unexplainable efficiency correlations From fifteen actual platform case studies comprising over eighty piles, design curves to estimate the average increase in unit friction and the ratio of average increase in unit skin friction to average unit adhesion at the resumption of pile driving as a function of time and depth are provided A new concept that explains the variation in dynamic measurement results is also provided A new theoretical method to construct the soil resistance during pile driving versus blows/foot curve is included It is hoped that the work included in this study will be an incentive for further research work
