Differential assessment of effects of increasing model complexity in THM coupled models of the FE experiment at Mt. Terri

IF 3.3 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2025-01-28 DOI:10.1016/j.gete.2025.100637

Sonja Kaiser , Wenqing Wang , Jörg Buchwald , Dmitri Naumov , Aqeel Afzal Chaudhry , Thomas Nagel

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引用次数: 0

Abstract

The Full-scale Emplacement (FE) experiment is studied numerically using large 3D meshes with over one million elements and degrees of freedom. Non-isothermal Richards flow coupled with mechanics is the applied physical process model. Systematic model variations are performed to generate results for a systematic comparison to a large set of measurement data utilising statistical methods. These variations are based on several hypotheses concerning potential sources of uncertainty or mismatch between modelled and measured data. Among them are geometrical aspects as well as aspects of model complexity, such as including additional materials or physical processes. The geometrical aspects include the effects of varying the inner tunnel radius, changing the heater representation, examining the uncertainty of the sensor locations and investigating geometrical aspects of adding a shotcrete layer. Complexity is increased by including shotcrete and a simplified excavation damaged zone (EDZ) as additional materials, by accounting for a ventilation phase and by providing an excavation-induced non-homogeneous initial liquid pressure field. We discuss the nature and magnitude of the effects of each of these aspects as well as their combinations. Notably, we find a large influence of the geometrical aspects on the temperature results in the tunnel on the one hand and on the other the importance of the initial liquid pressure field in the Opalinus clay. Overall, the comparison to the measurement data can be improved by incorporating the investigated aspects into models of the FE experiment.

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Terri山FE实验中THM耦合模型增加模型复杂性影响的差异性评价

采用超过一百万单元和自由度的大型三维网格，对全尺寸就位（FE）实验进行了数值研究。非等温理查兹流与力学耦合是应用物理过程模型。系统的模型变化是为了产生结果，以便利用统计方法与一组大的测量数据进行系统的比较。这些变化是基于关于不确定性的潜在来源或模型和测量数据之间不匹配的几个假设。其中包括几何方面以及模型复杂性方面，例如包括附加材料或物理过程。几何方面包括改变内部隧道半径的影响，改变加热器的表示，检查传感器位置的不确定性以及研究添加喷射混凝土层的几何方面。将喷射混凝土和简化的开挖损伤区（EDZ）作为附加材料，考虑到通风阶段和提供开挖引起的非均匀初始液体压力场，增加了复杂性。我们将讨论这些方面的影响的性质和程度，以及它们的组合。值得注意的是，我们发现一方面几何方面对隧道温度结果的影响很大，另一方面蛋白石粘土中初始液体压力场的重要性。总的来说，通过将所研究的方面纳入有限元实验模型，可以改善与测量数据的比较。

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.