Abstract
Gravel mixed soil, a certain amount of gravel mixed into the clay, is often used as core material of earth-rockfill dams to improve the stress-deformation behavior of the core wall. In this paper, a series of unidirectional freezing tests were conducted to study effects of coarse grains content on the freezing process and reveal frost characteristics of gravel mixed soil. Experimental results show that the variation of coarse grains content can cause changes in the pore structure, hydraulic and thermal property of mixed soil, and then affect the temperature distribution, water intake and frost heave. It is also found that temperature gradient is the dominant factor affecting freezing front location in comparison with coarse grains content, whereas coarse grains content is the dominant factor affecting water intake in freezing process of gravel mixed soil.
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