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Temperature Effects on the Unsaturated Permeability of the Densely Compacted GMZ01 Bentonite under Confined Conditions

Wei-Min Ye 1, * Min Wan 1 Bao Chen 1 Yong-Gui Chen 1 Yu-Jun Cui 2 Ju Wang 3
* Auteur correspondant
2 cermes - Géotechnique
navier umr 8205 - Laboratoire Navier
Abstract : In this study, temperature controlled soil-water retention tests and unsaturated hydraulic conductivity tests for densely compacted Gaomiaozi bentonite - GMZ01 (dry density of 1.70 Mg/m3) were performed under confined conditions. Relevant soil-water retention curves (SWRCs) and unsaturated hydraulic conductivities of GMZ01 at temperatures of 40°C and 60°C were obtained. Based on these results as well as the previously obtained results at 20°C, the influence of temperature on water-retention properties and unsaturated hydraulic conductivity of the densely compacted Gaomiaozi bentonite were investigated. It was observed that: (i) water retention capacity decreases as temperature increases, and the influence of temperature depends on suction; (ii) for all the temperatures tested, the unsaturated hydraulic conductivity decreases slightly in the initial stage of hydration; the value of the hydraulic conductivity becomes constant as hydration progresses and finally, the permeability increases rapidly with suction decreases as saturation is approached; (iii) under confined conditions, the hydraulic conductivity increases as temperature increases, at a decreasing rate with temperature rise. It was also observed that the influence of temperature on the hydraulic conductivity is quite suction-dependent. At high suctions (s > 60 MPa), the temperature effect is mainly due to its influence on water viscosity; by contrast, in the range of low suctions (s < 60 MPa), the temperature effect is related to both the water viscosity and the macro-pores closing phenomenon that is supposed to be temperature dependent.
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Soumis le : mercredi 2 mai 2012 - 16:31:54
Dernière modification le : vendredi 17 juillet 2020 - 17:09:07
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Wei-Min Ye, Min Wan, Bao Chen, Yong-Gui Chen, Yu-Jun Cui, et al.. Temperature Effects on the Unsaturated Permeability of the Densely Compacted GMZ01 Bentonite under Confined Conditions. Engineering Geology, Elsevier, 2012, 126, pp.1-7. ⟨10.1016/j.enggeo.2011.10.011⟩. ⟨hal-00693404⟩

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