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Effects of grain morphology on critical state: a computational analysis

Jerves, Alex X. and Kawamoto, Reid Y. and Andrade, José E. (2016) Effects of grain morphology on critical state: a computational analysis. Acta Geotechnica, 11 (3). pp. 493-503. ISSN 1861-1125.

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We introduce a new DEM scheme (LS-DEM) that takes advantage of level sets to enable the inclusion of real grain shapes into a classical discrete element method. Then, LS-DEM is validated and calibrated with respect to real experimental results. Finally, we exploit part of LS-DEM potentiality by using it to study the dependency of critical state (CS) parameters such as critical state line (CSL) slope λ, CSL intercept Γ, and CS friction angle Φ_(CS) on the grain’s morphology, i.e., sphericity, roundness, and regularity. This study is carried out in three steps. First, LS-DEM is used to capture and simulate the shape of five different two-dimensional cross sections of real grains, which have been previously classified according to the aforementioned morphological features. Second, the same LS-DEM simulations are carried out for idealized/simplified grains, which are morphologically equivalent to their real counterparts. Third, the results of real and idealized grains are compared, so the effect of “imperfections” on real particles is isolated. Finally, trends for the CS parameters (CSP) dependency on sphericity, roundness, and regularity are obtained as well as analyzed. The main observations and remarks connecting particle’s morphology, particle’s idealization, and CSP are summarized in a table that is attempted to help in keeping a general picture of the analysis, results, and corresponding implications.

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Additional Information:© 2015 Springer-Verlag Berlin Heidelberg. Received: 28 January 2015; Accepted: 2 November 2015; First Online: 27 November 2015.
Subject Keywords:Critical state parameters; Discrete element method; Grain’s morphology; Level sets; Real grain shapes
Issue or Number:3
Record Number:CaltechAUTHORS:20160915-100335066
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Official Citation:Jerves, A.X., Kawamoto, R.Y. & Andrade, J.E. Acta Geotech. (2016) 11: 493. doi:10.1007/s11440-015-0422-8
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70368
Deposited By: Tony Diaz
Deposited On:29 Sep 2016 23:45
Last Modified:03 Oct 2019 10:30

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