ABSTRACT
Analysis of the dynamic response of piles during driving is generally achieved by treating the pile as an elastic bar along which the stresswaves travel axially. Numerical solutions of the one-dimensional wave equation, with simple spring and dashpot soil models distributed along the pile, have been in common use over the last thirty years. However increased use of field monitoring of stress-waves during pile driving has provided the impetus for a number of recent advances, both in numerical techniques and in modelling of the soil response. This chapter outlines these advances, with particular emphasis on improved soil models which take due account of the inertial resistance of the soil continuum. A detailed description of one-dimensional wave propagation is included, and the basis for calculating the dynamic pile capacity from stress-wave data is outlined. The chapter concludes with a discussion of inherent limitations in predicting the static capacity of piles from dynamic measurements.
