TESTING RESEARCH ON FREEZING-THAWING CHARACTER AND STRUCTURAL EVOLVEMENT REGULARITY DURING FREEZING- THAWING PROCESS OF AEOLIAN SOIL IN WESTERN AREA OF LIAONING PROVINCE
Abstract：A new device for freezing-thawing test and the application is introduced. By using this device，the typical aeolian soil samples in the western area of Liaoning Province are frozen and thawed under different conditions of temperature gradients，load and water supply. By doing so，the regularity of frost heave and thaw settlement is illuminated. The test results can be drawn as follows：(1) the maximal swelling magnitude and thaw collapse value decrease with the increase of the temperature gradient；(2) not only in the closed system but also in the open system，the external force suppresses the swelling，and the thaw collapse value also decreases with the increase of the load；and (3) the external water supply will increase markedly the ultimate swelling magnitude and thaw collapse value. The displacement caused by freezing and thawing generates and the change of the macroscopic mechanical property and microscopic structure. This is mainly because the structure of the aeolian soil is changed；the bond force between the soil particles is damaged，and the soil particles rearranges. The structure evolvement regularity of aeolian soil in the western area of Liaoning Province during the period of freezing and thawing is studied under different moisture fields and stress fields by using the ice efficiency as the structure parameter.
