Abstract: The influence of different initial water contents, cold end temperatures and dry densities on sand water migration was studied using the self-developed water migration and frost heaving testing equipment. The influence of these three factors on frost heaving force and frost heaving capacity and the position of ice peak were determined. The results show that the initial water content and cold end temperature have obvious influence on the soil water migration and frost heaving effect. The water content increases from 0% to 10%, the peak water content increases by 5.00 times. The lateral frost heaving force and the frost heaving amount are increasing, and the ice front position moves up to 2.5 cm in height. The cold end temperature reduces from ?5 ℃ to ?15 ℃, the peak water content increases by 4.38 times. The lateral frost heaving force and the frost heaving amount are increasing, and the position of the ice peak moves up to 2.6 cm in height. Dry density has relatively insignificant influence on water migration and freezing characteristics of specimens. The results show an overall trend of slightly larger increases in specimen water content, lateral frost heaving force and frost heaving amount at smaller dry densities, and the position of the ice peak is concentrated in 2.2 ?2.5 cm in height. The prediction formulas of frost heaving force and frost heaving amount are put forward for different influencing factors, which can provide a reference for understanding the water migration law in sand under water vapor recharge and reasonably preventing frost heaving.

Key words: sand, water migration, frost heaving characteristics, water vapor recharge