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On the role of normal boundary condition in interface shear test for the determination of skin friction along pile shaft

Wang, J; Liu, S; Cheng, YP; (2017) On the role of normal boundary condition in interface shear test for the determination of skin friction along pile shaft. Canadian Geotechnical Journal , 54 (9) pp. 1245-1256. 10.1139/cgj-2016-0312. Green open access

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Abstract

This paper presents numerical results from a two-dimensional discrete element method (DEM) simulation study on the influence of lateral boundary condition on the shaft resistance of a pile driven into a crushable sand. The study was made by comparing the simulation results from the pile penetration test and the interface shear test employing parallel-bonded agglomerates for the modeling of particle breakage. The interface shear test was performed under three different types of normal boundary condition, namely, constant normal load (CNL), constant normal stiffness (CNS), and constant volume (CV) boundary conditions. For the pile penetration test, a series of sampling windows were identified on the initial ground configuration to monitor the stress-strain, volume change and particle breakage behavior of particle groups located within the sampling windows. A detailed investigation is then made by comparing the behavior of particle groups with that from the interface shear test to find out which type of the normal boundary condition best describes the lateral boundary condition in the pile penetration test. It is found that the behavior of a particle group has reached the peak state below the pile tip and the critical state after it reaches the pile shaft.

Type: Article
Title: On the role of normal boundary condition in interface shear test for the determination of skin friction along pile shaft
Open access status: An open access version is available from UCL Discovery
DOI: 10.1139/cgj-2016-0312
Publisher version: http://dx.doi.org/10.1139/cgj-2016-0312
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: pile penetration, interface shear test, constant normal stiffness (CNS), crushable sand, particle breakage, discrete element method (DEM) simulation
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1555639
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