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http://dx.doi.org/10.7474/TUS.2022.32.6.568

Grain-Based Distinct Element Modeling of Thermoshearing of Rock Fracture: DECOVALEX-2023 Task G  

Jung-Wook, Park (Korea Institute of Geoscience and Mineral Resources)
Li, Zhuang (Korea Institute of Civil Engineering and Building Technology)
Jeong Seok, Yoon (DynaFrax UG)
Chan-Hee, Park (Korea Institute of Geoscience and Mineral Resources)
Changlun, Sun (University of Science and Technology)
Changsoo, Lee (Korea Atomic Energy Institute )
Publication Information
Tunnel and Underground Space / v.32, no.6, 2022 , pp. 568-585 More about this Journal
Abstract
In the present study, we proposed a numerical method for simulating thermally induced fracture slip using a grain-based distinct element model (GBDEM). As a part of DECOVALEX-2023, the thermo-mechanical loading test on a saw-cut rock fracture conducted at the Korea Institute of Civil Engineering and Building Technology was simulated. In the numerical model, the rock sample including a saw-cut fracture was represented as a group of random Voronoi polyhedra. Then, the coupled thermo-mechanical behavior of grains and their interfaces was calculated using 3DEC. The key concerns focused on the temperature evolution, thermally induced principal stress increment, and fracture normal and shear displacements under thermo-mechanical loading. The comparisons between laboratory experimental results and the numerical results revealed that the numerical model reasonably captured the heat transfer and heat loss characteristics of the rock specimen, the horizontal stress increment due to constrained displacement, and the progressive shear failure of the fracture. However, the onset of the fracture slip and the magnitudes of stress increment and fracture displacement showed discrepancies between the numerical and experimental results. 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.
Keywords
Rock fracture; Thermoshearing; DECOVALEX-2023; Grain-based distinct element model; Voronoi diagram;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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