S - Kam Ng PhD Dissertation Final.pdf - Digital Repository of CCEE ...

269correlation between dynamic soil parameters and SPT N-value.Pile setup increases the dynamic soil parameters for cohesive soils, which increasethe dynamic resistance and provide a larger energy dissipation capability of the soil-pilesystem. For cohesionless soils at the EOD condition, an inverse relationship between theshaft dynamic soil parameters and the SPT N-value was observed, and empirical equations interms of SPT N-value were developed for their quantifications. Furthermore, correlationstudies performed for soil models at three different locations concluded the influence of pileinstallation on the shaft dynamic soil parameters estimation with the highest accuracy forsoils near pile toe and lowest accuracy for soils near ground surface. The results of similarcorrelation studies on toe dynamic soil parameters suggested that the difficulty and challengein quantifying these parameters in terms of measureable soil properties.The proposed CAPWAP signal matching procedure, based on variation in shaftdynamic soil parameters, not only provides comparable pile resistance estimation but alsoimproves the match quality, indicating the accuracy of matching the measured pile responses.The application of these parameters was validated based on an independent CAPWAPanalysis performed on the test pile ISU8 with a 19% match quality improvement. Althoughthe quantification of these dynamic soil parameters was developed based on a static soilresistance distribution estimated using the Schmertmann’s (1978) method, the methodologypresented in this paper can be adopted for other static analysis methods.7.9. AcknowledgmentsThe authors would like to thank the Iowa Highway Research Board for sponsoringthe research presented in this paper. We would like to thank the members of the TechnicalAdvisory Committee: Ahmad Abu-Hawash, Bob Stanley, Curtis Monk, Dean Bierwagen,Gary Novey, John Rasmussen, Ken Dunker, Kyle Frame, Lyle Brehm, Michael Nop, andSteve Megivern of this research project for their guidance. Special thanks are due to SherifS. AbdelSalam, Matthew Roling, and Douglas Wood for their assistance with the field testsand to Donald Davidson and Erica Velasco for their assistance with the laboratory soil tests.