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Influences of temperature and water content on mechanical property of argillite

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2014
auteur(s) Zhang Fan; Hu Dawei; Xie Shouyi; Shao Jian-Fu
journal (abréviation) European Journal of Environmental and Civil Engineering (European Journal of Environmental and Civil Engineering)
volume (numéro) 18 (2)
  
pages 173 – 189
résumé High-level radioactive waste is heat-emitting; the temperature can increase up to 100 °C in the gallery, and thus increase the density of microcracks in the host rock of argillite. In the meantime, the host rock undergoes swelling or shrinking induced by wetting or drying during ventilation or sealing process. Therefore, it is necessary to study the influence of temperature and water content, as well as their coupling effects, on the mechanical behaviour of argillite for the safety of underground disposal of high-level radioactive waste. For this purpose, we performed classical triaxial compression tests, micro-indentation tests and mini-compression tests on Callovo-Oxfordian (Cox) argillite under both temperature-controlled and relative humidity-controlled condition. Five levels of relative humidity (from 33 to 99%) and five levels of temperature (from 20 to 95 °C) were studied. The evolutions of elastic modulus, strength and deformability of Cox argillite were related to the temperature and relative humidity. It is found that the mechanical properties of Cox argillite were significantly deteriorated by the temperature and relative humidity, as well as their coupling effects.
mots clés argillite, unsaturated rocks, temperature, relative humidity, micro-indentation
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