| Issue |
E3S Web of Conf.
Volume 544, 2024
8th International Symposium on Deformation Characteristics of Geomaterials (IS-Porto 2023)
|
|
|---|---|---|
| Article Number | 12004 | |
| Number of page(s) | 7 | |
| Section | Behaviour, Characterization and Modelling of Various Geomaterials and Interfaces - Thermal Behaviour | |
| DOI | https://doi.org/10.1051/e3sconf/202454412004 | |
| Published online | 02 July 2024 | |
Thermo-hydro-mechanical behaviour of deep Ypresian clays
1 CIMNE, Geomechanics Group, Barcelona, Spain
2 UPC, Department of Civil and Environmental Engineering, Barcelona, Spain
3 ONDRAF/NIRAS, R&D-department, Brussels, Belgium
* Corresponding author: nuria.sau@upc.edu
Investigating the thermo-hydro-mechanical behaviour of deep Ypresian clays (300 to 400 m below ground) is crucial since they are one of Belgium’s potential host rock formations for deep geological disposal of radioactive waste. To this aim, a newly designed and fully instrumented thermal oedometer cell with lateral stress measurement was used to determine the stress state accurately. First, well-preserved core samples were loaded to bring them to the large in situ stresses and reduce the induced matric suction on deep water-undrained sampling. The remaining matric suction was then reduced by soaking with synthetic water of the formation. Next, drained loading and unloading paths were followed to attain different vertical effective stresses at varying overconsolidation ratios (OCRs) before the drained thermal paths (heating and cooling). The results indicated a systematic increase in the horizontal effective stress on heating at constant vertical effective stress. In addition, thermal-induced volume changes in heating/cooling at different OCRs were studied. Test results were finally interpreted within a thermo-mechanical elastoplastic framework.
Key words: deep clay / thermo-hydro-mechanical behaviour / oedometer / temperature
© The Authors, published by EDP Sciences, 2024
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