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

1373. The experimental investigation confirmed that the amount of setup at a given timedepends on soil properties including the coefficient of consolidation, the SPT N-valueas well as the thicknesses of the cohesive soil layers along the embedded pile length.Piles embedded in a cohesive soil with a larger coefficient of consolidation exhibitedhigher percent increase in total pile resistances. However, piles embedded in a softersoil characterized by a smaller SPT N-value led higher percent increase in setup. Thecollected experimental data showed sufficient information for quantifying the pilesetup using properties of surrounding soil, which is rarely available in the publishedliterature.4. The successful correlation between pile setup and the relevant soil propertiesindicates a cost-effective means to estimate the pile setup using SPTs, CPTs with porepressure dissipation tests, and/or one-dimensional consolidation tests. In addition,detailed laboratory soil classifications and soil layers identification are also required.However, this approach is far more easily adoptable than those requiring pile restrikesor lacking generalization in terms of soil properties.A systematic investigation on the quantification of pile setup in terms of the surrounding soilproperties is presented in the companion paper (Chapter 4).3.7. AcknowledgmentsThe writers would like to thank the Iowa Highway Research Board for sponsoring theresearch presented in this paper. The writers also express their gratitude to the followingmembers of the project Technical Advisory Committee for their guidance and advice: AhmadAbu-Hawash, Dean Bierwagen, Lyle Brehm, Ken Dunker, Kyle Frame, Steve Megivern,Curtis Monk, Michael Nop, Gary Novey, John Rasmussen and Bob Stanley. The members ofthis committee represent Office of Bridges and Structures, Soils, Design Section, and Officeof Construction of the Iowa DOT, FHWA Iowa Division, and Iowa County Engineers. Thewriters would also like to thank the various bridge and soil contractors for their contributionsto the field tests. Special thanks are due to Douglas Wood, Donald Davidson and EricaVelasco for their assistances with the field and laboratory tests.