Evaluating rate effects using high and low energy blows for a pipe pile in clay
Evaluating rate effects using high and low energy blows for a pipe pile in clay
There are still uncertainties in models for assessing rate effects on soil resistance in SRD models. One technique to assess these models is to perform signal matching of blows during driving at two, significantly different, energy levels. Pile Driving Analyzer (PDA) data were obtained from several test piles at a clay site in Fargo, ND, USA. The piles, of diameter 0.61 m and wall thickness 19 mm were driven approximately 12 m through glacial lake clays and an additional 3 m into glacial till. At the end of driving into the glacial till, and also during restrike of some piles, blows with hammer impact energies ranging between approximately 80 kNm and 20 kNm were recorded, allowing for assessment of rate effects at similar times during driving. Signal matching analyses are presented using both Smith and continuum soil models at multiple energy levels for two of the test piles. The results provide insight not only into rate effects for blows with different maximum velocities, but also into the relative magnitudes of driving resistance estimated using the two different models for dynamic pile-soil interaction.
Mark Randolph; J. Doherty; J. A. Schneider
5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)
6 - Pile Installation Challenges and Decommissioning in sands and clays: monopiles, anchor piles, pin piles
https://doi.org/10.53243/ISFOG2025-152
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