Effects of heating and hydraulic cycling on the stiffness response of a rigid ansiotropic clay: preliminary results
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hdl:2117/10158
Tipus de documentComunicació de congrés
Data publicació2009
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
The poster presents the results of an experimental investigation aimed at evaluating the effects of heating and hydraulic cycling on the small-strain stiffness of a rigid Jurassic clay (Opalinus clay, Jura Mountains, Mont Terri Underground Laboratory, Switzerland). This clay was subjected to thermal loads during an in situ heating experiment (HE-D). After the test, intact samples were retrieved and analysed at laboratory scale. The influence of thermal loads was studied using basic
characterisation, microstructural techniques (MIP) and non-destructive techniques (ultrasonic pulses). The retrieved samples were then subjected to wetting and drying
paths. The hydraulic effects were tracked using basic characterisation (water content and porosity) and non-destructive techniques (ultrasonic pulses and bender elements). Test results showed a higher sensitivity of stiffness on suction increase for the material less affected by the thermal load (far from heater). Tests are currently
being carried out on a new and fully instrumented high-pressure triaxial cell to monitor degradation effects induced by hydraulic cycling under a controlled stress field. Degradation is monitored by horizontal and vertical bender elements to track different directions.
CitacióMitaritonna, G. [et al.]. Effects of heating and hydraulic cycling on the stiffness response of a rigid ansiotropic clay: preliminary results. A: Deformation and failure of geomaterials. A Multidisciplinary Scientific Workshop. "Deformation and failure of geomaterials. A Multidisciplinary Scientific Workshop". Brindisi: 2009.
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Poster_Brindisi GM_ER1.pdf | Poster | 261,3Kb | Visualitza/Obre |