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ORIGINAL RESEARCH article

Front. Earth Sci.
Sec. Solid Earth Geophysics
Volume 12 - 2024 | doi: 10.3389/feart.2024.1500055
This article is part of the Research Topic Advanced Materials and Technologies for Sustainable Development of Underground Resources View all 20 articles

Study on the mechanism of gas migration and breakthrough in saturated bentonite considering interface effect

Provisionally accepted
Daoping Liu Daoping Liu 1Jingna Guo Jingna Guo 2*Qiang Li Qiang Li 3Zhanqing Chen Zhanqing Chen 3
  • 1 Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China., Chendu 610213, China
  • 2 Chengdu University of Information Technology, Chengdu, China
  • 3 China University of Mining and Technology, Xuzhou, Jiangsu Province, China

The final, formatted version of the article will be published soon.

    With the rapid development of China's nuclear industry, a significant amount of highlevel radioactive waste has been accumulated. Generally, the nuclear waste is placed in waste canisters, with the outer layer wrapped in bentonite blocks, and then buried in geological formations approximately 1000m underground. Bentonite gradually becomes saturated by groundwater.Chemical reactions within the disposal repository generate gases, causing the gas pressure to increase over time, which can significantly impact the stability of the nuclear waste repository. In this paper, bentonite without an interface was tested for water permeability test and gas injection under rigid boundary conditions. The evolution of permeability and the rate of increase in outlet pressure with varying gas injection pressure were analyzed. Based on these results, the gas migration in saturated bentonite was discussed, and the mechanism of a gas breakthrough under rigid boundary conditions was investigated. The results showed that at lower gas injection pressures, gas primarily

    Keywords: Rigid boundary, Interface effect between bentonite blocks, Mechanism of gas migration, Two-phase flow effect;, Gas breakthrough

    Received: 22 Sep 2024; Accepted: 12 Dec 2024.

    Copyright: © 2024 Liu, Guo, Li and Chen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Jingna Guo, Chengdu University of Information Technology, Chengdu, China

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