Laboratory Study On Subgrade And Pavement Salt Expansion Characteristic Of Sulfuric Saline Soil Area By Using Large-scale Experimental Tank

As Chinese rapid economic development, demands of infrastructure construction in special area have been advanced, and implements of engineering construction in saline soil area have been paid attention. Harm has been caused by salt expansion to constructions, such as railroad, highway, water conservancy and buildings. The levels of damage to engineering structures were different when environment conditions changed, such as moisture, heat and salt.Sulfuric saline soil is special in saline soil area that has frequent engineering disasters. Damages caused by it were the most serious and the most typical. With changes of temperature, moisture, salt and overlying load, salt expansion was emerged that caused uneven uplift, loose and expansion, cracking in subgrade and frost boiling in road surface. The foundations are deep research laws of saline soil distribution, moisture and heat transfer, moisture and salt transfer and salt expansion that used to control disasters in saline soil area.Salt expansion processes in subgrade of Sulfuric saline soil are the external performance of moisture temperature, salinity and stress fields interacting with each other. Salt expansion in subgrade is the results of Changes in the external environment. In this paper, the variation laws of moisture, temperature, salinity and stress fields were obtained through the indoor experiment dynamic observations which are moisture, temperature, and salinity fields in subgrade and road surface deformation.