In situ seismic monitoring during centrifuge tests of jacked piles

Zhao, Y., White, D.J. and Bolton, M.D. (2006) In situ seismic monitoring during centrifuge tests of jacked piles. Ng, C.W.W. (ed.) In Physical Modelling in Geotechnics, 6th ICPMG'06 - Proceedings of the 6th International Conference on Physical Modelling in Geotechnics. vol. 1-2, Taylor & Francis. pp. 907-912 .

Record type: Conference or Workshop Item (Paper)

Abstract

Centrifuge tests simulating the installation of jacked piles were conducted in dense uniform fine silica sand. Seismic wave velocity distributions within the soil bed beneath and beside the pile were measured at various stages of pile penetration using accelerometer arrays and an air hammer vibration source. The pile penetration resistance and the concurrent variation of normalized G0 are presented. Consistent trends of G0 variation were observed and the local stress regime around the base and along the shaft was inferred. The observed stress distribution directly below the pile base is well-fitted by a cavity expansion analysis, and the stress distribution along the shaft provides evidence of friction fatigue and the conditions leading to set-up.

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