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http://dx.doi.org/10.7474/TUS.2019.29.4.262

Numerical Modelling of One Dimensional Gas Injection Experiment using Mechanical Damage Model: DECOVALEX-2019 Task A Stage 1A  

Lee, Jaewon (Radioactive Waste Disposal Research Division, Korea Atomic Energy Research Institute)
Lee, Changsoo (Radioactive Waste Disposal Research Division, Korea Atomic Energy Research Institute)
Kim, Geon Young (Radioactive Waste Disposal Research Division, Korea Atomic Energy Research Institute)
Publication Information
Tunnel and Underground Space / v.29, no.4, 2019 , pp. 262-279 More about this Journal
Abstract
In the engineering barriers of high-level radioactive waste disposal, gases could be generated through a number of processes. If the gas production rate exceeds the gas diffusion rate, the pressure of the gas increases and gases could migrate through the bentonite buffer. Because people and the environment can be exposed to radioactivity, it is very important to clarify gas migration in terms of long-term integrity of the engineered barrier system. In particular, it is necessary to identify the hydro-mechanical mechanism for the dilation flow, which is a very important gas flow phenomenon only in medium containing large amounts of clay materials such as bentonite buffer, and to develop and validate new numerical approach for the quantitative evaluation of the gas migration phenomenon. Therefore, in this study, we developed a two-phase flow model considering the mechanical damage model in order to simulate the gas migration in the engineered barrier system, and validated with 1D gas flow modelling through saturated bentonite under constant volume boundary conditions. As a result of numerical analysis, the rapid increase in pore water pressure, stress, and gas outflow could be simulated when the dilation flow was occurred.
Keywords
Gas migration; Dilation flow; Mechanical damage model; Coupled hydro-mechanical model; DECOVALEX-2019;
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