Abstract

This paper presents the results of a series of tensile-compressive (TC) and compressive-tensile (CT) static load tests performed on instrumented model piles preinstalled in silica sand samples prepared in a half-cylindrical calibration chamber with viewing windows along its symmetry plane. Images of the model pile and the surrounding soil were captured during axial loading through the observation windows using digital cameras and were subsequently analyzed using the digital image correlation (DIC) technique to generate the displacement and strain fields in the sand domain. The shaft resistances mobilized during the experiments were obtained using load cells placed at the head and the base of the model piles. The results obtained from the load tests revealed that reversal of loading direction substantially reduces the unit shaft resistance. This response was attributed to a drop in the radial strain exhibited by the soil elements surrounding the model pile shaft, which could be explained by a misalignment of the principal axes of the stress and fabric tensors resulting from load reversal. The results also indicated that the tensile-to-compressive shaft resistance ratio of fresh preinstalled piles is always nearly one.

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Acknowledgments

The authors would like to acknowledge the support from the Instituto para el Desarrollo de la Ciencia y Tecnología en Colombia, Colciencias.

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Go to Journal of Geotechnical and Geoenvironmental Engineering
Journal of Geotechnical and Geoenvironmental Engineering
Volume 145Issue 9September 2019

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Received: May 9, 2018
Accepted: Jan 16, 2019
Published online: Jun 27, 2019
Published in print: Sep 1, 2019
Discussion open until: Nov 27, 2019

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Ph.D. Student, Lyles School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907 (corresponding author). ORCID: https://orcid.org/0000-0001-5583-5361. Email: [email protected]
Ruben D. Tovar-Valencia, S.M.ASCE [email protected]
Assistant Professor, Universidad del Norte, Km. 5 Via Puerto Colombia, Barranquilla, Colombia. Email: [email protected]
Rodrigo Salgado, F.ASCE [email protected]
Charles Pankow Professor in Civil Engineering, Lyles School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907. Email: [email protected]
Monica Prezzi, A.M.ASCE [email protected]
Professor of Civil Engineering, Lyles School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907. Email: [email protected]

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