Analysis of thermally-induced fracture of Callovo-Oxfordian claystone: From lab tests to field scale

IF 3.3 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2024-08-04 DOI:10.1016/j.gete.2024.100579

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

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引用次数: 0

Abstract

Argillaceous rocks are a suitable host rock for the deep geological disposal of exothermic High-Level Radioactive Waste (HLW) and Spent Fuel (SF). Excess pore pressures develop in this type of rocks when subject to increased temperatures that, in some circumstances, may lead to the fracturing of the rock. The paper explores this phenomenon by means of coupled numerical analyses carried out within a fully coupled thermo-hydro-mechanical (THM) framework. The general THM formulation is described as well as the anisotropic elastic and anisotropic elastoviscoplastic constitutive laws employed. Thermal extension triaxial tests are simulated as a check on the performance of the numerical formulation and to provide calibration data for the tensile strength of the material. Selected results from a comprehensive set of three-dimensional analyses of a large-scale field heating test, designed to study the possibility of thermal-induced failure in the rock, are presented and discussed. The analyses reproduce satisfactorily the observed patterns of behaviour. The effects of the constitutive law, material parameters and the presence of the excavation damage zone (EDZ) around the main drift and around the heater boreholes are studied. In particular, their effects on the state of the stress in the heated area are examined in the context of the potential for thermal fracturing of the rock.

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Callovo-Oxfordian粘土岩热致断裂分析：从实验室测试到实地规模

火山岩是一种适合于对放热的高放射性废物（HLW）和乏燃料（SF）进行深层地质处置的主岩。这类岩石在温度升高时会产生过大的孔隙压力，在某些情况下可能导致岩石断裂。本文通过在完全耦合的热-水-机械（THM）框架内进行耦合数值分析来探讨这一现象。文中介绍了一般的 THM 公式以及所采用的各向异性弹性和各向异性弹塑性构成定律。模拟了热延伸三轴试验，以检验数值公式的性能，并提供材料拉伸强度的校准数据。本文介绍并讨论了对大规模现场加热试验进行综合三维分析的部分结果，该试验旨在研究岩石中热诱发破坏的可能性。分析结果令人满意地再现了观察到的行为模式。研究了构成法则、材料参数以及主漂移周围和加热器钻孔周围开挖破坏区（EDZ）的影响。特别是，根据岩石热断裂的可能性，研究了它们对加热区域应力状态的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.