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http://dx.doi.org/10.7474/TUS.2021.31.4.270

Hydro-Mechanical Modeling of Fracture Opening and Slip using Grain-Based Distinct Element Model: DECOVALEX-2023 Task G (Benchmark Simulation)  

park, Jung-Wook (Korea Institute of Geoscience and Mineral Resources)
Park, Chan-Hee (Korea Institute of Geoscience and Mineral Resources)
Lee, Changsoo (Korea Atomic Energy Research Institute)
Publication Information
Tunnel and Underground Space / v.31, no.4, 2021 , pp. 270-288 More about this Journal
Abstract
We proposed a numerical method to simulate the hydro-mechanical behavior of rock fracture using a grain-based distinct element model (GBDEM) in the paper. As a part of DECOVALEX-2023 Task G, we verified the method via benchmarks with analytical solutions. DECOVALEX-2023 Task G aims to develop a numerical method to estimate the coupled thermo-hydro-mechanical processes within the crystalline rock fracture network. We represented the rock sample as a group of tetrahedral grains and calculated the interaction of the grains and their interfaces using 3DEC. The micro-parameters of the grains and interfaces were determined by a new methodology based on an equivalent continuum approach. In benchmark modeling, a single fracture embedded in the rock was examined for the effects of fracture inclination and roughness, the boundary stress condition and the applied pressure. The simulation results showed that the developed numerical model reasonably reproduced the fracture slip induced by boundary stress condition, the fracture opening induced by fluid injection, the stress distribution variation with fracture inclination, and the fracture roughness effect. In addition, the fracture displacements associated with the opening and slip showed good agreement with the analytical solutions. We expect the numerical model to be enhanced by continuing collaboration and interaction with other research teams of DECOVALEX-2023 Task G and validated in further study experiments.
Keywords
Rock Fracture; DECOVALEX-2023; Grain-Based Distinct Element Model; 3DEC; Fracture Opening and Slip;
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