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An unsaturated hydraulic conductivity model for compacted GMZ01 bentonite with consideration of temperature

Abstract : As one of the most important properties of compacted bentonite used as buffer/backfill materials, hydraulic conductivity is influenced by various factors including temperature, microstructure and suction (or degree of saturation), etc. Based on the readily available results of both temperature-controlled water-retention tests and unsaturated infiltration tests under confined (constant volume) conditions, influences of temperature and microstructure variations on unsaturated hydraulic conductivity of the compacted Gaomiaozi (GMZ01) bentonite were analyzed. Then, a revised unsaturated hydraulic conductivity model considering temperature effects and microstructure changes was developed. With this proposed model, prediction and comparison were made on the unsaturated hydraulic conductivity of the compacted GMZ01 bentonite at 20 A degrees C. Results show that water-retention capacity of compacted GMZ01 bentonite decreases as temperature increases and the degree of the temperature influence depends on suction. Under confined conditions, influence of hydration on microstructure of compacted GMZ01 bentonite depends on pore size. The proposed model can well describe the variations of unsaturated hydraulic conductivity with suction at different temperatures. However, further improvement of the proposed model is needed to account for the phenomenon of inter-aggregate pores clogging that occurred at the initial stage of hydration of compacted GMZ01 bentonite under confined conditions.
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https://hal-enpc.archives-ouvertes.fr/hal-01111121
Contributeur : Yu-Jun Cui <>
Soumis le : jeudi 29 janvier 2015 - 16:07:49
Dernière modification le : vendredi 17 juillet 2020 - 17:09:08

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  • HAL Id : hal-01111121, version 1

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Wei-Min Ye, Min Wan, Bao Chen, Yong-Gui Chen, Yu-Jun Cui, et al.. An unsaturated hydraulic conductivity model for compacted GMZ01 bentonite with consideration of temperature. Environmental Earth Sciences, Springer, 2014, 71, pp.1973-1944. ⟨hal-01111121⟩

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