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Effect of decompression and suction on macroscopic and microscopic behavior of a clay rock

Abstract : The goal in this research was to analyze the effects of decompression and suction on the formation of cracks in a clay rock from the Andra (French National Radioactive Waste Management Agency) site at Bure (Meuse–Haute-Marne, France). The article investigates the relationship between the changes in the hydromechanical properties and the changes in microstructure and porosity. Concerning the effect of decompression, at the macroscopic scale, the study highlighted an important effect on the elastic modulus and permeability, but little effect at the microscopic scale except an evolution of mineralogy related to the oxidation of pyrite often present in layers where cracks develop. Concerning the effect of suction, at the macroscopic level, the results showed that, on drying path, the change in the properties of the material was very small, whereas, on wetting path, a large decrease in tensile strength and gas permeability was observed. At the microscopic level, observations with SEM and ESEM, and measurements with MIP, highlighted the evolution of microstructural organization as a function of suction, and the propagation and enlargement of cracks on wetting path, rather than on drying path.
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https://hal-centralesupelec.archives-ouvertes.fr/hal-01342158
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Submitted on : Tuesday, July 5, 2016 - 2:46:23 PM
Last modification on : Sunday, June 26, 2022 - 12:45:02 AM

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Xing Wei, Myriam Duc, Mahdia Hattab, T. Reuschlé, Said Taibi, et al.. Effect of decompression and suction on macroscopic and microscopic behavior of a clay rock. Acta Geotechnica, Springer Verlag, 2016, 12, pp.47-65. ⟨10.1007/s11440-016-0454-8⟩. ⟨hal-01342158⟩

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