Effect of temperature on soil-water characteristics and hysteresis of compacted Gaomiaozi bentonite |
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| Authors: | Wei-min Ye Min Wan Bao Chen Yong-gui Chen Yu-jun Cui and Ju Wang |
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| Affiliation: | [1]Key Laboratory of Geotechnical and Underground Engineering, Ministry of Education, Tongji University, Shanghai 200092, China [2]United Research Center for Urban Environment and Sustainable Development, Ministry of Education, Shanghai 200092, China [3]Ecole des Ponts Paries Tech, Paris, France [4]Beijing Research Institute of Uranium Geology, Beijing 100029, China |
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| Abstract: | Laboratory tests under different constraint conditions were carried out to obtain the soil-water retention curves (SWRCs)
of highly-compacted confined/unconfined Gaomiaozi (GMZ) bentonite at 20, 40 and 80 °C, respectively. The effect of temperature
on the soil-water characteristics of the highly-compacted GMZ bentonite was analyzed. The results show that the water retention
capacity of the highly-compacted GMZ bentonite decreases as the temperature increases under unconfined and confined conditions.
At a certain temperature, the constraint conditions have little influence on the water retention capacity of the compacted
bentonite at high suction, but the water retention capacity of the confined specimen is lower than that of the unconfined
specimen at low suction. Under unconfined conditions, the hysteretic behaviour of the compacted bentonite decreases with increasing
temperature. At high suction (>4 MPa), the hysteretic behaviour of the unconfined bentonite tends to increase with the decrease
of the suction. In summary, the hysteretic behaviour of the compacted bentonite is not significant. |
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| Keywords: | Gaomiaoz bentonite soil-water characteristic hysteretic behavior nuclear waste repository water retention capacity temperature |
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