Abstract
The temperature increase induced by radioactive waste decay generates the thermal pressurisation around the excavation damage zone (EDZ), and the excess pore pressure could induce fracture re-opening and propagation. Shear strain localisation in band mode leading to the onset of micro-/macro-cracks can be always evidenced before the fracturing process from the lab experiments using advanced experimental devices. Hence, the thermal effects on the rock behaviour around the EDZ could be modelled with the consideration of development of shear bands. A coupled local 2nd gradient model with regularisation technique is implemented, considering the thermo-hydro-mechanical (THM) couplings in order to well reproduce the shear bands. Furthermore, the thermo-poro-elasticity framework is summarized to validate the implemented model. The discrepancy of thermal dilation coefficient between solid and fluid phases is proved to be the significant parameter leading to the excess pore pressure. Finally, an application of a heating test based on Eurad Hitec benchmark exercise with a drift supported by a liner is studied. The strain localisation induced by thermal effects is properly reproduced. The plasticity and shear bands evolutions are highlighted during the heating, and the shear bands are preferential to develop in the minor horizontal principal stress direction. Different shear band patterns are obtained with changing gap values between the drift wall and the liner. A smaller gap between the wall and the liner can limit the development of shear bands.
Highlights
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The formulation of a coupled local 2nd gradient model considering the thermo-hydro-mechanical (THM) couplings.
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Validation of the model with comparison with analytical solution of thermo-elastic problem.
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The prediction of strain localisation pattern induced by thermal effects around a large scale drift.
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The analysis of the gap distance (between the drift wall and the liner) on the strain localisation process under the thermal loading.
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Data availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 847593. The first author also would like to thank the China Scholarship Council (No. 201906710096) for their financial support.
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Hangbiao Song: Conceptualization, investigation, methodology, software, validation, writing - original draft. Gilles Corman: Conceptualization, investigation, methodology, software, validation, writing. Frédéric Collin: Conceptualization, investigation, methodology, project administration, writing - review and editing.
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Appendix A Stiffness matrix
Appendix A Stiffness matrix
The stiffness matrix of the flow problem is:
where
The stiffness of the thermal problem is:
where
The stiffness matrices of the coupling between the flow and mechanical processes are:
where
The stiffness matrices of the coupling between the thermal and mechanical processes are:
where
The stiffness matrices of the coupling between the flow and thermal processes are:
\(G3_{(2\times 3)}^{\tau _1}\), same as \(G1_{(2\times 4)}^{\tau _1}\) and \(G2_{(2\times 3)}^{\tau _1}\), being the additional contribution of gravity volume force reads:
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Song, H., Corman, G. & Collin, F. Thermal Impact on the Excavation Damage Zone Around a Supported Drift Using the 2nd Gradient Model. Rock Mech Rock Eng 56, 7575–7598 (2023). https://doi.org/10.1007/s00603-023-03440-x
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DOI: https://doi.org/10.1007/s00603-023-03440-x