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http://dx.doi.org/10.7474/TUS.2020.30.4.306

An Introduction to the DECOVALEX-2019 Task G: EDZ Evolution - Reliability, Feasibility, and Significance of Measurements of Conductivity and Transmissivity of the Rock Mass  

Kwon, Saeha (Department of Energy Systems Engineering, Seoul National University)
Min, Ki-Bok (Department of Energy Systems Engineering, Seoul National University)
Publication Information
Tunnel and Underground Space / v.30, no.4, 2020 , pp. 306-319 More about this Journal
Abstract
Characterizations of Excavation Damage Zone (EDZ), which is hydro-mechanical degrading the host rock, are the important issues on the geological repository for the spent nuclear fuel. In the DECOVALEX 2019 project, Task G aimed to model the fractured rock numerically, describe the hydro-mechanical behavior of EDZ, and predict the change of the hydraulic factor during the lifetime of the geological repository. Task G prepared two-dimensional fractured rock model to compare the characteristics of each simulation tools in Work Package 1, validated the extended three-dimensional model using the TAS04 in-situ interference tests from Äspö Hard Rock Laboratory in Work Package 2, and applied the thermal and glacial loads to monitor the long-term hydro-mechanical response on the fractured rock in Work Package 3. Each modelling team adopted both Finite Element Method (FEM) and Discrete Element Method (DEM) to simulate the hydro-mechanical behavior of the fracture rock, and added the various approaches to describe the EDZ and fracture geometry which are appropriate to each simulation method. Therefore, this research can introduce a variety of numerical approaches and considerations to model the geological repository for the spent nuclear fuel in the crystalline fractured rock.
Keywords
Geological repository; Spent nuclear fuel; Excavation Damage Zone; Numerical simulation; Fractured rock;
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