The accuracy and consequently the usefulness of wave equation analysis in pile driving problem are largely hinged upon accurate input of wave equation soil parameters that are representative of the soil conditions at the site. Since Smith model parameters have been used in most wave equation analysis techniques, emphasis is given to the development of algorithms to determine Smith model parameters from static ultimate soil resistance R_s (including shaft resistance f_u and toe resistance R_u), quake Q and damping J. In this paper, a methodology for using SPT values to determine Smith model parameters is developed. The approach used herein to develop useful correlations consists of a number of consecutive steps, where the static soil resistance is first determined, soil quake Q evaluated for a variety of soil types, and finally, the damping coefficient J is determined by computer simulation of the standard penetration test with the help of GRLWEAP program. The results obtained indicate the usefulness of the adopted method when compared to existing cases analyzed by the CAPWAP.
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