A design approach for piles in langley clay based on PDA testing

Yen T. Bui, John P. Sully, Ender J. Parra, Thomas E. Sully

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Deep Foundations

ABSTRACT: A series of PDA tests were performed on four 610 mm diameter steel pipe piles installed to depths of about 65 m in a normally consolidated to lightly overconsolidated cohesive soil profile in the Lower Mainland of British Columbia. The axial capacity of the piles was assessed based on in situ and laboratory tests using the API RP2A (2000) method for determining axial capacity in compression. The piles were installed over a one week period and monitored with a PDA system. Restrikes at setup periods ranging from 5 days to 30 days were used to predict the increase in axial capacity with time after initial driving. The results obtained form the basis for the suggested design approach.

RESUMEN: Mediciones con un sistema PDA fueron realizadas para 4 pilotes installados hasta 65 m de profundidad en una arcilla ligeramente sobreconsolidada. La capacidad axial de los pilotes fue determinada basada el el metodo API RP2A (2000). Se installaron los pilotes durante una semana y fueron hincado de nuevo a diferente periodos de espera de 5 a 30 dias para evaluar el incremento de capacidad axial con el tiempo. Se presenta un metodo de diseno para pilotes basado en los resultados

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