Abstract:
Over 200 vertical and battered piles have been installed at the I-205 Abernethy Bridge Widening construction project in Clackamas County, Oregon to construct a temporary trestle and oscillator platforms. Piles were primarily installed in fine-grained alluvium, decomposed basalt, and weathered to competent basalt with embedment depths ranging from 25 to 190 ft. 31 Pile Driving Analyses (PDAs) were performed on 24 different piles. Two of the PDA tests were completed on pile that were coated on the bottom half and non-coated on the top half. The PDA results for these piles showed a greater than 2x increase in unit skin resistance for the coated half of the pile. The case study will present the capacities achieved and driving conditions encountered, along with how the PDA data helped steer driving criteria and engineering decisions in the field.