Analysis of short- and long-term coupled THM behaviours in argillaceous rock for nuclear waste disposal

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2025-03-07 DOI:10.1016/j.gete.2025.100660

Fei Song , Antonio Gens , Stefano Collico , Carlos Plúa , Gilles Armand , Huaning Wang

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引用次数: 0

Abstract

Deep geological disposal is recognised as the most feasible method for the management of High-level Nuclear Waste (HLW). This study involved the performance of numerical analyses to evaluate the short- and long-term Thermo-Hydro-Mechanical (THM) behaviour of HLW disposals at the repository scale. A far-field numerical model is analysed, considering geological profiles 1000 m deep from the surface. In the analyses, an elasto-viscoplastic constitutive model is employed to characterize the behaviour of the argillaceous host rock, taking into account hardening-softening behaviour, anisotropy of THM properties, as well as permeability variation due to damage. Generalized Darcy’s law and Fourier’s law are utilized to represent the liquid and heat fluxes, respectively. Wide-ranging parametric analyses are performed to investigate the effect of spacing between parallel microtunnels and of different multi-physics interactions on the evolution of THM behaviour at the repository scale. Variations in spacing significantly impact the temperature and pore pressure fields, which in turn influence the development of potential damage zones. An enhanced understanding of the THM mechanisms associated with the short-term and long-term stability of nuclear waste disposals has been achieved in this study, therefore, providing valuable insights for the design and optimization of the geological repositories.

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核废料处置中泥质岩石中短期和长期耦合THM行为分析

深地质处置被认为是高放核废料管理最可行的方法。本研究涉及数值分析的性能，以评估在储存库规模的高废液处置的短期和长期的热-水-机械（THM）行为。考虑距离地表1000 m深的地质剖面，分析了远场数值模型。在分析中，采用弹粘塑性本构模型来表征泥质宿主岩石的行为，考虑到硬化-软化行为、THM性质的各向异性以及损伤引起的渗透率变化。采用广义达西定律和傅立叶定律分别表示液体和热量的通量。进行了广泛的参数分析，以研究平行微隧道之间的间距和不同的多物理场相互作用对储存库尺度上THM行为演变的影响。井距的变化会显著影响温度场和孔隙压力场，进而影响潜在损伤区的发育。因此，本研究加深了对与核废料处理的短期和长期稳定性相关的THM机制的理解，为地质处置库的设计和优化提供了有价值的见解。

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来源期刊

Geomechanics for Energy and the Environment Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

11.80%

发文量

期刊介绍： The aim of the Journal is to publish research results of the highest quality and of lasting importance on the subject of geomechanics, with the focus on applications to geological energy production and storage, and the interaction of soils and rocks with the natural and engineered environment. Special attention is given to concepts and developments of new energy geotechnologies that comprise intrinsic mechanisms protecting the environment against a potential engineering induced damage, hence warranting sustainable usage of energy resources. The scope of the journal is broad, including fundamental concepts in geomechanics and mechanics of porous media, the experiments and analysis of novel phenomena and applications. Of special interest are issues resulting from coupling of particular physics, chemistry and biology of external forcings, as well as of pore fluid/gas and minerals to the solid mechanics of the medium skeleton and pore fluid mechanics. The multi-scale and inter-scale interactions between the phenomena and the behavior representations are also of particular interest. Contributions to general theoretical approach to these issues, but of potential reference to geomechanics in its context of energy and the environment are also most welcome.