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The rock content in freezing-thawing cycles is one of the key factors influencing the hydro-thermal transfer and freezing-thaw transferring characteristics of soil-rock mixtures. To study the effect of freezing-thawing cycles on hydro-thermal transfer, frost heave and thawing settlement of soil-rock mixtures, the soil-rock mixtures composed by Qinghai-Tibet silty clay and gravel with different stone content ratios (10%, 25%, 40%) were selected as research objects, and 10 unidirectional freezing-thawing cycles were conducted. The results indicated that the differences in the temperature and unfrozen water content of soil-rock mixtures during the freezing-thaw cycles had a strong correlation with the rock content. With an increase in the rock content, the completely frozen time for soil-rock mixtures has been extended, and the variable rate of the unfrozen wate content decreased. The difference of buried depth mainly influenced the temperature transfer of soil-rock mixture, and had an indirect effect on the variation of volumetric unfrozen water. For the samples with stone contents of 10% and 40%, the displacement change was manifested as shrinkage during freezing and expansion after thawing, and with an increase in the stone content, the shrinkage of specimens during freezing tended to decrease.
Wang et al. (Fri,) studied this question.
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