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 sodiu...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.展开更多
As to salty soil, salt migrateswith water in freezing soils, assembles and crystallizes continuously. Consequently the swelling of the soil volume leads to the phenomenon of salt heaving. It has a practical significan...As to salty soil, salt migrateswith water in freezing soils, assembles and crystallizes continuously. Consequently the swelling of the soil volume leads to the phenomenon of salt heaving. It has a practical significance for solving salt-heaving and frost-heavingdamage in engineering to deepen the understanding of salt heavingmechanism. In this paper a general overview about new research results at this aspect was presented. And then the study of salt migration and salt heavingmechanism and present salt heavingmodels were summarized. For further researching the field of salt transfer it is urgent to continually strengthen the salt migration and the numerical simulation study of salt heavingmechanism to expect perfecting the general evaluation of salt heavingprediction models so as to have a better service for engineering.展开更多
基金project supported by The Natural Science Foundation of China and parts of the financial support were from Gansu Provincial Institute of Communication Sciences.
文摘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.
文摘As to salty soil, salt migrateswith water in freezing soils, assembles and crystallizes continuously. Consequently the swelling of the soil volume leads to the phenomenon of salt heaving. It has a practical significance for solving salt-heaving and frost-heavingdamage in engineering to deepen the understanding of salt heavingmechanism. In this paper a general overview about new research results at this aspect was presented. And then the study of salt migration and salt heavingmechanism and present salt heavingmodels were summarized. For further researching the field of salt transfer it is urgent to continually strengthen the salt migration and the numerical simulation study of salt heavingmechanism to expect perfecting the general evaluation of salt heavingprediction models so as to have a better service for engineering.
