The Study On Temperature Variation And Moisture Rise And Salinity Transport Of Railway Subgrade In Saline Soil Area

The DK821+600～900of new second double of the Lanzhou-xinjiang ganqing section istest section of saline soil foundation processing. Through the field experimental observationof railway subgrade water rise and temperature variation, the rule of moisture and salinitychange in the subgrade is concluded by the data of measured moisture and salinity, the rule oftemperature of subgrade is concluded by the data of measured temperature of subgrade. Therange of moisture and salinity is tested in saline soil subgrade by reinforcing in CFG pilecomposite foundation. The result is calculated by COMSOL Multiphysics for the distributionand accumulation of water and salinity. By the date of experimental observation, theexpansive area of saline soil subgrade of reinforcing in CFG pile composite foundation ispredicted for analyzing the effect of cushion processed in saline soil subgrade. The content ofconcrete analysis as follows:(1)The content of moisture and salinity and temperature variation in subgrade ismeasured for the rule of changes of moisture and salinity, and temperature changes insubgrade.(2)According to the actual problem, the unsaturated soil moisture transport is adopted formoisture transport equation, that is, the equation of Richards, and solute transport equation ofporous media is used for the equation of salinity changes in subgrade.(3)Analyzing the changes of moisture and salinity in subgrade by numerical simulation,it is concluded that the content of moisture and salinity in the subgrade. Finally thedistribution of salinity in subgrade is given. For the different evaporation of moisture in faceof the subgrade, the changes and transportation of salinity is made by software.(4)According to the observation data of processed subgrade, the effect of subgradecushion is testified by the content of moisture and salinity. The disease and prevention adviceof saline soil subgrade is introduced.