The Study And Numerical Simulation On Moisture-heat-salt-stress Coupled Mechanism In The Sulphate Saline Soil Subgrade

The civil engineering application in saline soil area is necessary to the development of the national economy in the special area. Salt expansion is harmful to the construction such as railroad, highway, water conservancy and buildings.The different saline soils have the different extent of the damage to the engineering structure in the different environment condition, such as moisture, heat and salt. The sulphate saline soil is a typical saline soil which is harmful to the engineering structure. And the movement of moisture-heat-salt is the main reason that causes the disease in the subgrade in saline area such as tuberositas, loose and dehiscence. And it exercises influence over the subgrade strength and stabilization.The dissertation regards the sulphate saline soil as the main object of study on theoretical analysis and experimental research. Referring to the former theoretical frame about the moisture-heat-stress coupling model in frozen soil, and according to the essential theories of soil physics and heat transfer, and applying to the solution crystallography and mechanics of frozen ground, the dissertation presents the two-dimensional governing differential equations of the moisture-heat-salt-stress four field coupling model.Equation of moisture can be written as...