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Distinct element analysis for Class II behavior of rocks under uniaxial compression
Authors:Hiroyuki Shimizu  Tomofumi Koyama  Tsuyoshi Ishida  Masakazu Chijimatsu  Tomoo Fujita  Shigeo Nakama
Affiliation:1. Department of Civil and Earth Resources Engineering, Kyoto University, Kyoto, Kyotodaigaku-katsura 4, Nishikyo-ku, Kyoto 615-8540, Japan;2. Department of Urban and Environmental Engineering, Kyoto University, Kyoto, Japan;3. Hazama Corporation, Japan;4. Japan Atomic Energy Agency (JAEA), Japan;1. The Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan 430072, China;2. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;1. School of Resources and Safety Engineering, Central South University, Changsha, Hunan 410083, China;2. ARC Centre of Excellence for Geotechnical Science and Engineering, Faculty of Engineering and Built Environment, The University of Newcastle, Callaghan, Australia;1. Centre for Offshore Foundation Systems, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia;2. Australian Centre for Geomechanics, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia
Abstract:In this study, the radial strain control method for uniaxial compression tests was introduced in the distinct element method (DEM) codes and the Class II behavior of rocks was simulated. The microscopic parameters used in the DEM models were determined based on laboratory uniaxial compression tests and Brazilian tests carried at Äspö Hard Rock Laboratory, Sweden. The numerical simulation results show good agreement with the complete stress–strain curves for Class II obtained from the laboratory experiments. These results suggest that the DEM can reproduce the Class II behavior of the rock successfully. The mechanism of the Class II behavior was also discussed in detail from the microscopic point of view. The loading condition and microscopic structure of rocks will play an important role for the Class II behavior.
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