Influence of grain size on strength of polymineralic crystalline rock: New insights from DEM grain-based modeling
نویسندگان
چکیده
Grain size effect on rock strength is a topic of great interest in geotechnical engineering. A consensus obtained from earlier laboratory tests that generally decreases with the increase grain for both silicate and carbonate rocks; however, some recent numerical results conflict such test results. To address this intriguing issue, polymineralic crystalline low porosity investigated numerically using grain-based modeling (GBM) approach discrete element method (DEM) by interpreting micro-cracking process response to loading. In agreement previous DEM simulation results, simulated found increasing homogeneous heterogeneous models, even when number assembled disks one mineral changes. The mechanism mainly associated smooth-joint contacts along interfaces generation boundary cracks significantly weaken integrity model, which similar effects inherent defects real rock. As increases, fewer are built model becomes much higher. Hence, solely changing as observed cannot be replicated. degradation parameters used mimic possible effect. comparable those heterogeneity considered. Degradation provides plausible explanation strength.
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ژورنال
عنوان ژورنال: Journal of rock mechanics and geotechnical engineering
سال: 2021
ISSN: ['2589-0417', '1674-7755']
DOI: https://doi.org/10.1016/j.jrmge.2021.01.011