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Can LS-DEM be Used to Simulate Cyclic Behavior of Sand?

Jostad, Hans Petter and Khoa, H. D. V. and Karapiperis, K. and Andrade, J. (2021) Can LS-DEM be Used to Simulate Cyclic Behavior of Sand? In: Challenges and Innovations in Geomechanics. Lecture Notes in Civil Engineering. Vol.1. No.125. Springer International Publishing , Cham, pp. 228-235. ISBN 978-3-030-64513-7.

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The suitability of LS-DEM to simulate drained and undrained cyclic behavior of sand is evaluated in this paper. A digital twin of a small specimen of the Hostun sand is used to simulate the cyclic average (macroscopic) response along idealized stress and strain paths, representing oedometer, drained and undrained triaxial conditions. The results are here only qualitatively evaluated based on comparison with real test data of different sands, since a) cyclic laboratory tests have not been performed on the actual specimen, and b) relatively low contact stiffness was used in this preliminary analysis in order to reduce the computational cost. The oedometer curves during virgin loading, unloading and re-loading and the cyclic secant stiffnesses during drained cyclic loading were captured qualitatively, but were significantly softer than the experimental ones. From the simulation of a drained cyclic triaxial test the development of accumulated volumetric strain seems reasonable, and the computed response during a cyclic constant volume (undrained) triaxial test looks very promising. Based on this initial study, more detailed LS-DEM simulations will therefore be carried out to improve the understanding of cyclic behavior of saturated sand.

Item Type:Book Section
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Karapiperis, K.0000-0002-6796-8900
Additional Information:© The Author(s), under exclusive license to Springer Nature Switzerland AG 2021. First Online: 15 January 2021.
Subject Keywords:LS-DEM; Sand; Cyclic behavior; Strain and pore pressure accumulation
Series Name:Lecture Notes in Civil Engineering
Issue or Number:125
Record Number:CaltechAUTHORS:20210122-142125937
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107665
Deposited By: Tony Diaz
Deposited On:22 Jan 2021 22:44
Last Modified:16 Nov 2021 19:05

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