A series of important changes in physicochemical and physicomechanical properties ofsaline soils occurs during cooling, i. e. the parts of solute migrate towards the colder endof soil column and the parts of the sodium sulphate recrystallize from the soil solution, caus-ing the soil expension in volume or salt heave, which makes the soil decrease in compres-sive strength. The ratio of salt heave of soils decreases with the increase in the coolingrate, surcharge. initial density and the cohesion between soil particles, but increases with anincrease in water content. The fact that soil volume does not reduce obviously during re-warming shows the nonreversibility of salt heave process. During the repeated cycles ofcooling and warming, the salt heave accumulates and the compressive strength of soil de-creases gradually.
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