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Experimental Study of the Water Permeability of a Partially Saturated Argillite
The goal of this paper is to characterize the hydromechanical behaviour of the Callovian‐Oxfordian argillite from the Bure site. The samples come from a core bored at a depth of 475 m in the argillite layer. The mass transfer process has been studied thanks to a series of desaturation experiments. The transfer properties of the unsaturated argillite are determined in terms of relative permeability to water as a function of capillary pressure. Successive steps of suction are imposed, and the transient mass variation is surveyed. The experimental behaviour is analysed with an analytical diffusion model. For each step of suction, the model provides the relative permeability. The relative permeability variation is of two orders of magnitude along the whole range of capillary pressure. The permeability results are compared with previous works on the same argillite and a good accordance is found. The capillary curve is also determined showing clearly a hysteresis. The Van Genuchten model has been selected. However, the relative permeability and the capillary curve needs two different sets of parameters to reproduce the experimental results. The study of the axial and radial strains shows a non‐linearity and an anisotropy as reported by previous works.
Experimental Study of the Water Permeability of a Partially Saturated Argillite
The goal of this paper is to characterize the hydromechanical behaviour of the Callovian‐Oxfordian argillite from the Bure site. The samples come from a core bored at a depth of 475 m in the argillite layer. The mass transfer process has been studied thanks to a series of desaturation experiments. The transfer properties of the unsaturated argillite are determined in terms of relative permeability to water as a function of capillary pressure. Successive steps of suction are imposed, and the transient mass variation is surveyed. The experimental behaviour is analysed with an analytical diffusion model. For each step of suction, the model provides the relative permeability. The relative permeability variation is of two orders of magnitude along the whole range of capillary pressure. The permeability results are compared with previous works on the same argillite and a good accordance is found. The capillary curve is also determined showing clearly a hysteresis. The Van Genuchten model has been selected. However, the relative permeability and the capillary curve needs two different sets of parameters to reproduce the experimental results. The study of the axial and radial strains shows a non‐linearity and an anisotropy as reported by previous works.
Experimental Study of the Water Permeability of a Partially Saturated Argillite
Shao, Jian‐Fu (editor) / Burlion, Nicolas (editor) / Semete, P. (author) / Imbert, C. (author) / Desgree, P. (author) / Février, B. (author) / Courtois, A. (author) / Touzé, G. (author)
2013-02-19
12 pages
Article/Chapter (Book)
Electronic Resource
English
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