2026-04-17T04:20:06Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/4272012026-01-23T03:56:56Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Sau Valenzuela, Núria author Romero Morales, Enrique Edgar author Van Baelen, H author 2024-07-02 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. Peer Reviewed Postprint (published version) Àrees temàtiques de la UPC::Física Deep clay Thermo-hydro-mechanical behaviour Oedometer Temperature Thermo-hydro-mechanical behaviour of deep Ypresian clays