Incorporating surface roughness into DEM models of crushable soils
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2020 Rorato et al ITASCA 13-07 .pdf (360,2Kb) (Accés restringit)
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hdl:2117/336363
Tipus de documentText en actes de congrés
Data publicació2020
EditorITASCA Consulting Group
Condicions d'accésAccés restringit per política de l'editorial
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Abstract
One obvious characteristic of granular grains is that their surface is not smooth, especially when observed at smaller scales. Some advanced experiment imaging methods such as optical interferometry, scanning electron microscopy and atomic force microscopy have been developed and successfully used to characterize and quantify grain surface roughness. One fundamental finding is that surface roughness can significantly affect mechanical behavior of granular materials. Grain crushing is of importance for several geotechnical problems, such as side friction on driven piles, railway ballast durability and slaking induced irreversible deformations. Discrete Element Method (DEM) has been widely used to model grain crushing and has gained wide acceptance with its own advantages in providing micro-scale mechanical observations of granular materials (Zhou et al. 2019). However, in those models of breakable grains, grain surface roughness effects were rarely included, leading to a certain misuse of contact parameters (Ciantia et al. 2019). In this paper, a well-established DEM crushing contact model and a rough Hertzian contact model are combined to incorporate both effects in a single contact model. The paper is organized as follows. First, a brief introduction of the rough-particle crushing model is proposed. Then a simple particle failure test is conducted to validate the correct implementation of the rough model.
CitacióZhang, N. [et al.]. Incorporating surface roughness into DEM models of crushable soils. A: International Itasca Symposium on Applied Numerical Modeling. "Applied Numerical Modeling in Geomechanics 2020: Proceedings of the 5th International Itasca Symposium, Vienna, Austria, February 18-20, 2020". ITASCA Consulting Group, 2020, p. 1-4. ISBN 978-0-9767577-5-7.
ISBN978-0-9767577-5-7
Fitxers | Descripció | Mida | Format | Visualitza |
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2020 Rorato et al ITASCA 13-07 .pdf | 360,2Kb | Accés restringit |