An international study on THM modelling of the full-scale heater experiment at Mont Terri laboratory

IF 3.3 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2025-01-03 DOI:10.1016/j.gete.2024.100631

Bastian Johannes Graupner , Kate Thatcher , Larissa Friedenberg , Ruiping Guo , Teklu Hadgu , Wenbo Hou , Sonja Kaiser , Taehyun Kim , Chan-Hee Park , Changsoo Lee , Edward Matteo , Thomas Nagel , Rebecca Newson , Peng-Zhi Pan , Michael Pitz , Jonny Rutqvist , Jan Thiedau , Luca Urpi

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引用次数: 0

Abstract

We present results from an international model comparison study of the Full-Scale Emplacement (FE) experiment in Opalinus Clay at the Mont Terri Laboratory, Switzerland. Based on a provided parameter set the teams decided which parameters they adopted for their models, whether they considered the excavation and the ventilation phase in addition to the heating phase and if they included technical features like the shotcrete or the EDZ. The teams were able to reproduce the measured parameters temperature, relative humidity and pore pressure. The modelled results for temperature agree very closely between the teams especially in the sensors in Opalinus Clay. All teams were able to reproduce the redistribution of water in the bentonite backfill due to heating. The evolution of the relative humidity showed similar trends with differences in the intensity of the dry out effect. To model the pore pressure evolution is more complex because it comprises the full interaction of the coupled THM processes. The spread between the pore pressure modelled by the teams was larger, with some teams overestimating the pressure increase due to heating and some teams overestimating the extent of drainage. The agreement of modelled results with measurements improves with larger distance to the heater. We conclude that the EDZ and the shotcrete potentially influence the behaviour of the rock causing higher differences closer to the heater. Further research is needed to better implement those influences into the models. Based on the calibrated models, the future evolution of temperature, relative humidity and pore pressure was predicted over the next 10 years following a change of the heat power applied in 2023 and 2024. Again, the predicted temperatures agree very closely between the teams. Most teams do not expect an increase in relative humidity during the next 10 years after the initial dry-out.

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蒙特特里实验室全尺寸加热器实验THM模型的国际研究

我们提出了一项国际模型比较研究的结果，该研究是在瑞士蒙特特里实验室的蛋白石粘土中进行的全尺寸就位（FE）实验。根据提供的参数集，团队决定他们采用的模型参数，除了加热阶段之外，他们是否考虑挖掘和通风阶段，以及他们是否包括喷射混凝土或EDZ等技术特征。研究小组能够重现测量到的参数温度、相对湿度和孔隙压力。模拟的温度结果在两个小组之间非常接近，特别是在蛋白石粘土的传感器上。所有小组都能够重现膨润土回填体中由于加热而产生的水的重新分配。相对湿度的变化趋势相似，只是干燥效应的强度不同。孔隙压力演化的建模更为复杂，因为它包含了耦合THM过程的全部相互作用。研究小组模拟的孔隙压力之间的差异更大，一些团队高估了由于加热引起的压力增加，而另一些团队高估了排水的程度。与加热器的距离越大，模拟结果与测量结果的一致性越好。我们得出结论，EDZ和喷射混凝土可能会影响岩石的行为，在靠近加热器的地方造成较大的差异。需要进一步的研究来更好地将这些影响纳入模型。基于校正后的模型，预测了2023年和2024年热功率变化后未来10年的温度、相对湿度和孔隙压力的演变。再一次，两队预测的温度非常接近。大多数团队预计，在最初的干旱之后的未来10年里，相对湿度不会增加。

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.