Effects of Water and Salt Crystallization Phase Change on Saline Soil Pressure During Freezing Process

Abstract

Abstract: Soil deformation caused by frost heave and salt heave is a serious threat to building foundations, roads and railway subgrades. The effects of water and salt crystallization phase change on saline soil pressure during freezing process were studied experimentally. The results show that the ice crystallization pressure increases with the increase of moisture content, while salt crystallization pressure increases with the increase of salt content under a certain dry density and moisture content. During the freezing process, the soil pressure unchanges firstly, then increases rapidly, and finally decreases to stability. The analysis shows that the ice crystallization pressure and salt crystallization pressure act as tensile stress on the pore wall to squeeze the soil particles between each other, after the peak stress, the breaken of soil structure and redistribution of soil particles lead to the soil pressure rapidly decreases to stability. In addition, the applicability of the traditional salt crystallization pressure equation and ice crystallization pressure equation were discussed. Finally, the ice crystallization pressure equation was modified.

Key words: saline soil, frost heave, salt heave, phase change, crystallization pressure, soil pressure

CLC Number:

TU43

TAN Renyi, WU Daoyong, HUANG Youfen, WU Shiyu. Effects of Water and Salt Crystallization Phase Change on Saline Soil Pressure During Freezing Process[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1296-1303.

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