Inputs from in situ experiments to the understanding of the unsaturated behaviour of Callovo-Oxfordian claystone
| Autor: | Jean Talandier, Jad Zghondi, Gilles Armand, Rémi de La Vaissière, Nathalie Conil, Hippolyte Djizanne |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
lcsh:GE1-350
In situ Engineering business.industry 0211 other engineering and technologies Radioactive waste 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Creep Long term behavior Geotechnical engineering Rock mass classification Saturation (chemistry) business lcsh:Environmental sciences 021101 geological & geomatics engineering 0105 earth and related environmental sciences |
| Zdroj: | E3S Web of Conferences, Vol 9, p 03004 (2016) |
| ISSN: | 2267-1242 |
| DOI: | 10.1051/e3sconf/20160903004 |
| Popis: | The French national radioactive waste management agency (Andra) research program is dedicated to preparing the construction and operation of a deep geological disposal facility for high-level and intermediate-level long-lived radioactive waste (HL, IL-LLW) in the Callovo-Oxfordian claystone (COx). The characterization of the COx thermo-hydro-mechanical (THM) behavior, at different scales of interest, must gradually give relevant data for design and safety calculations. The effects of saturation and desaturation of COx claystone are studied in laboratory conditions (sample scale) and in situ (drift scale), in order to improve knowledge on ventilation effect at gallery wall as galleries will remains open during operational phase (more than 100 years for some specific galleries) in the repository. The Saturation Damaged Zone (SDZ) experiment is outlined and its results are discussed. This experimentation aims to change the relative humidity in an isolated portion of a gallery in order to follow the HM behavior of the surrounding rock mass. Drying and wetting cycles could induce in certain cases cracks and swelling and modify the hydromechanical behavior of the claystone around the gallery (Young modulus, strength, creep…). The long term behavior of the COx claystone at the vicinity of gallery is then studied by performing climatic, hydraulic, geological and geomechanical measurements. Results of the in situ experiment are discussed with respect to the identified process on samples. The discussion given on this paper intends to highlights the inputs from 7 years of an in situ experiment to better understand the unsaturated behavior of the COx claystone. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|