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Volume 40 Issue S1
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LIU Zhen-ya, LIU Jian-kun, LI Xu, FANG Jian-hong. Experimental study on air-dried shrinkage and frozen deformation characteristics of unsaturated bentonite[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(S1): 229-234. DOI: 10.11779/CJGE2018S1037
Citation: LIU Zhen-ya, LIU Jian-kun, LI Xu, FANG Jian-hong. Experimental study on air-dried shrinkage and frozen deformation characteristics of unsaturated bentonite[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(S1): 229-234. DOI: 10.11779/CJGE2018S1037
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Experimental study on air-dried shrinkage and frozen deformation characteristics of unsaturated bentonite

  • 1. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
    2. Qinghai Research and Observation Base, Key Laboratory of Highway Construction & Maintenance Technology in Permafrost Regions, Ministry of Transport, Xining 810001, China;

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  • Received Date: June 10, 2017
  • Published Date: August 24, 2018
    Graphical Abstract
    • Abstract
  • Saturated bentonite swells during freezing while unsaturated bentonite may shrink during freezing, which may be related to the water loss-induced shrinkage and ice-water phase transition-induced expansion. In order to investigate the contribution of these two parts, the bentonite samples with various void ratios and degrees of saturation are examined using the frozen deformation tests, air-dried shrinkage tests and freezing point tests. The test results demonstrate that the freezing point of the unsaturated bentonite mainly depends on its gravimetric water content and is much larger than that of unsaturated silt clay. The sample with high density becomes loose and the one with low density becomes dense after being frozen. The bentonite samples with low degree of saturation, i.e., 0.4, 0.5, 0.6, 0.7, shrink, whereas the sample with high degree of saturation (0.9) swells after being frozen. A linear relationship is found between the volumetric ice content and the ice-water phase transition-induced volumetric deformation, which is a comprehensive reflection of the influence of degree of saturation, void ratio and temperature on the deformation of unsaturated bentonite.
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    • References (17)
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