Abstract:

In order to prove the existence of water migration in ice under vibration loading and to investigate the law of water migration in ice, vibration tests were carried out under negative temperature conditions with artificial column ice as the research object, and the migration of liquid water in ice was investigated by changing the ambient temperature and loading frequency. First, in combination with the load characteristics of heavy fully loaded trucks borne by highways in permafrost areas, with 55 kPa as the load amplitude and the cyclic vibration frequency set to 2 880-28 800 times, the cyclic vibration loaded layered column ice water migration test was carried out under the conditions of －3 ℃, 0.5 Hz; Then, the vibration test was carried out under the conditions of -5 to the water migration test of artificial column ice under cyclic vibration loading was carried out at －1.0 ℃ and 0.1-0.5 Hz; Finally, the test data were fitted. The results show that: Under vibration loading, the liquid water in the ice migrates along the structural cracks in the loading direction; At different ambient temperatures, the amount of water migration increases exponentially; At different loading frequencies, the amount of water migration grows in stages in the form of a segmented function. When the loading frequency and load amplitude are constant, the amount of water migration and the peak growth rate increase with the increase of ambient temperature and decrease with the decrease of temperature, and the moisture migration measured at -1 ℃ is about 3.75 times of that at -5 ℃; The closer to the melting point, the faster the peak growth rate occurs, and the slower the opposite is. When the ambient temperature and load amplitude are constant, the moisture migration and the peak growth rate increase with the increase of frequency and decrease with the decrease of frequency, and the amount of water migration measured at 1.0 Hz is about 2.04 times of that at 0.1 Hz; The faster the loading frequency is, the faster the peak growth rate appears, and the slower the opposite is.

Key words: water migration, near phase transition zone, ice-water phase transition, vibration loading, ambient temperature, loading frequency