Laboratory And Field Research On Coupled Hydro-Thermo-saline-mechanical Behavior Of Subgrade In Vitriol Saline Soil Areas And Field Numerical Simulation

Due to collapsibility, expansion and corrosion of saline soil, combined with complex geological conditions and weather in the western region, road construction in Saline Soil area has always been regarded as a global problem.The moisture , temperature, salinity and stress fields of Vitriol Saline Soil Subgrade has an effect on each other,and the process of expansion is the external performance of the four fields interaction. Change in the external environment is the exciter of soil Subgrade inflation. This paper starts with analysis of laboratory and field test, changes of the four fields are abtained by dynamic observation in the temperature field, moisture field, the salt fields, and road surfuace deformation of laboratory Subgrade test. Subgrade dynamic observation of internal parameters is conduncted by laying the temperature sensors, salinity sensors and pressure cells in the field project, and interaction of the four fileds laws within Subgrade is further studied.Basing on the previous theory, we develop a computer program to test a variety of operating conditions and advace a Four-field coupling correction formula. According to the Numerical simulation of road, we find that Sand and gravel material is best ,Su-soil material followed, Aeolian sand material is worst for blocking salt. In selecting the separate layers,geotextile is best.