E3S Web Conf.
Volume 205, 20202nd International Conference on Energy Geotechnics (ICEGT 2020)
|Number of page(s)||7|
|Section||Minisymposium: Shale and Clay Behavior for Energy Production and Nuclear Waste Disposal (organized by Alessio Ferrari and Russell T. Ewy)|
|Published online||18 November 2020|
Modelling the multiscale behaviour of claystone: deformation, rupture, and hydro-mechanical phenomena around underground galleries
1 Univ. de Lyon, Tribology and Systems Dynamics Laboratory (LTDS, ENTPE), 69000 Lyon, France
2 Univ. de Liège, Urban and Environmental Engineering Department (UEE), 4000 Liège Belgium
3 Univ. Grenoble Alpes, CNRS, Grenoble INP, 3SR, 38000 Grenoble, France
4 French national radioactive waste management agency (Andra), R&D Division, 92298 Chatenay-Malabry France
1 Univ. de Poitiers, Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), 86000 Poitiers, France
6 Delft Univ. of Technology, Department of Geoscience and Engineering, 2600 Delft Netherlands
* Corresponding author: firstname.lastname@example.org
In the context of underground exploitation, the behaviour of rocks near galleries and tunnels conditions their stability. Underground drilling generates deformations, damage, fracturing, and significant modification of flow characteristics in the surrounding rock. However, the influence of small-scale characteristics and behaviour on the rock deformations and damage at engineering scale remains a complex issue. Consequently, the multiscale behaviour of a clay rock is modelled starting from the large scale of the excavation damaged zone around galleries and then enriching the approach by considering microstructural characteristics from the scale of mineral inclusions. Lastly, a double-scale numerical framework is considered. It allows to relate small- to large-scale rock behaviour in terms of deformations and material rupture. In fact, the development of damage and cracking at microscale allows to predict large-scale fracturing. The developed method focuses on a claystone in the particular context of long-term management of high-level nuclear wastes by deep geological repository. The results highlight the possibilities of double-scale computing in the prediction of the behaviour of underground engineering structures.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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