Modeling the particle breakage of rockfill materials with the cohesive crack model |
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| Institution: | 1. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China;2. Institute of Material, China Academy of Engineering Physics, Mianyang 621700, China;3. School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, M13 9PL, UK;1. Department of Civil Engineering, University of Toronto, 35 St. George Street, M5S 1A4 Toronto, ON, Canada;2. Geomechanica Inc., 90 Adelaide St. W., Suite 300, M5H 3V9 Toronto, ON, Canada;3. National Cooperative for the Disposal of Radioactive Waste (NAGRA), Hardstrasse 73, 5430 Wettingen, Switzerland;1. School of Engineering and ICT, University of Tasmania, TAS 7001, Australia;2. School of Civil & Environmental Engineering, University of Science and Technology Beijing, China;3. School of Resources and Civil Engineering, Northeastern University, Liaoning, China;1. School of Mathematics and Statistics, University of Melbourne, Victoria 3010, Australia;2. School of Earth Sciences, University of Melbourne, Victoria 3010, Australia |
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| Abstract: | A practical combined finite–discrete element method was developed to simulate the breakage of irregularly shaped particles in granular geomaterials, e.g., rockfill. Using this method, each particle is discretized into a finite element mesh. The potential fracture paths are represented by pre-inserted cohesive interface elements (CIEs) with a progressive damage model. The Mohr–Coulomb model with a tension cut-off is employed as the damage initiation criterion to rupture the predominant failure mode occurs at the particle scale. Two series of biaxial tests were simulated for both the breakable and unbreakable particle assemblies. The two assemblies have identical configurations, with the exception that the former is inserted with CIEs and is breakable. The simulated stress–strain–dilation responses obtained for both assemblies are in agreement with experimental observations. We present a comprehensive study of the role of particle breakage on the mechanical behavior of rockfill materials at both the macroscopic and microscopic scales. The underlying mechanism of particle breakage can be explained by the force chain in the assemblies. |
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| Keywords: | Rockfill materials Particle breakage Combined FDEM Cohesive crack model Force chain |
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