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

294to 0.80, the maximum value recommended by AASHTO (2010). Overall, the constructioncontrol consideration has increased the originally-calibrated resistance factors of the IowaBlue Book method as follow:1. Construction control using WEAP has increased the original φ value of theIowa Blue Book from 0.60 to 0.64 or improved the φ value by 7%.2. Construction control using CAPWAP increases the original φ value of theIowa Blue Book for the clay profile from 0.60 to 0.68 (or improved by 8%),considering both the EOD and setup resistance conditions.3. The construction control method using CAPWAP, based on the restrikecondition, improves the φ values for clay, mixed soil, and sand profiles by27%, 18%, and 6%, respectively.8.2.5. Dynamic soil parameters quantificationDue to the limitation with current default CAPWAP matching procedure, in whichconstant damping factor and quake value are assumed over an entire soil profile and theindeterminate nature of the CAPWAP analysis, Chapter 7 shows the high degree of scatter inthe correlation studies between the dynamic soil parameters and the SPT N-value. Althoughthe accuracy of pile resistance estimation using dynamic analysis methods is highlydependent upon the appropriate input of these dynamic soil parameters, these parametershave not been successfully quantified from any standard geotechnical in-situ or laboratorysoil test results. Thus, an improved CAPWAP signal matching procedure with variation inshaft dynamic soil parameters was proposed. Its implementation led to the followingconclusions:1. The analytical results show the dynamic soil parameters are not constant over anentire soil profile, but they vary with different soil types and soil properties.2. For cohesive soils at the EOD condition, the correlation studies revealed a directrelationship between the shaft damping factor and the SPT N-value, and aninverse relationship between the shaft quake value and the SPT N-value.Furthermore, correlation studies using CPT-measured soil properties concludedthat the shaft damping factor was influenced by different soil types, while no