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

295relationship was conclusively drawn between the shaft quake value and the CPTmeasuredsoil properties. Since the process of conducting the SPT is similar topile driving, both are subjected to a continuous impulsive hammer force, thedynamic soil parameters were found to be correlated well with SPT N-value.3. For cohesionless soils at the EOD condition, an inverse natural algorithmicrelationship between the shaft dynamic soil parameters and the SPT N-value wasobserved.4. The effect of pile setup increases the dynamic soil parameters for cohesive soils,which increases the dynamic resistance and provides a larger energy dissipationcapability of the soil-pile system.5. The correlation studies concluded that the influence of pile installation on theshaft dynamic soil parameters estimation, showing the highest accuracy for soilsnear pile toe and lowest accuracy for soils near ground surface.6. The results of similar correlation studies on toe dynamic soil parameters suggestthat the difficulty and challenge with quantifying these parameters in terms of anymeasureable soil properties. The proposed matching procedure not only providescomparable pile resistance estimation, but also improves match quality.8.3. Recommendations for Future WorkIn the future, additional detailed restrikes and static load tests on piles embedded incohesive soils as similarly employed in this research will further improve the correlationstudies between the pile setup and soil properties. The actual measurement of pileresistances at the EOD and over a period of time on a series of piles using a static load testingsystem will help validate the pile setup estimated using the dynamic analysis methods, andserves as a reference in the resistance factors calibration. Besides pile setup, pilesexperiencing a decrease in resistance (i.e., pile relaxation) in sandy soils may be investigated.The regional resistance factor calibration may be extended to other pile types, such as drilledshafts and end bearing piles. The uncertainties associated with the estimations of shaftresistance and end bearing may be accounted for by separately providing sufficient datapoints on the pile resistance distribution. The implementation of the proposed CAPWAP