Exploration into the causes of uncertainty in UDEC Grain Boundary Models |
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| Institution: | 1. Engineering Geology and Resource Geotechnics Group, Simon Fraser University, Burnaby, BC, Canada;2. State Key Laboratory of Coal Mining and Clean Utilization (China Coal Research Institute), Beijing, China;1. Nanyang Centre for Underground Space, School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore;2. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;3. State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China;4. Department of Civil Engineering, Monash University, Clayton, 3800, VIC, Australia;1. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China |
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| Abstract: | Considerable research has recently been undertaken to investigate the simulation of brittle fracture mechanisms using distinct element grain boundary models. However, to date, few studies have addressed the limitations of these models when used for predictive analysis. Our research suggests that mesh geometry dependencies can impart irreducible uncertainties into the method despite apparent calibration. In addition, Voronoi meshing routines can limit the kinematic freedom, and increase the degree of interlocking and localized tensile failure; whereas, more recently introduced triangular mesh geometries can have an opposite effect, increasing kinematic freedom, and predisposing models towards shear failure mechanisms. |
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| Keywords: | Distinct element method Brittle fracture Grain-based models Tensile failure Micromechanics Synthetic rock mass |
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