One-dimensional creep tests and model studies on saturated saline soil

The physical and chemical interaction between soil particles and pore salt solutions in saturated saline soils has a strong influence on the mechanical behavior of soils, which makes the saline soils exhibit different deformation characteristics. In order to accurately describe this interaction of saturated saline soil, the experimental studies on the remolded specimens saturated with distilled water, sodium sulfate solution and sodium chloride solution are carried out by the conventional oedometer tests and constant load creep tests. The test results show that there is a significant difference in the consolidation creep between saline soils and non-saline soils. This phenomenon is more obvious with the increase of salt content. The consolidation creep effect of sulphate soils and chloride soils with the same salt content is different. Secondly, based on the Yin-Graham one-dimensional creep equation, a one-dimensional creep theoretical model for saturated saline soils is established by using the Pitzer ion interaction model and the van't Hoff osmotic suction equation and introducing the effective osmotic stress. Finally, the improved theoretical model and experimental data are compared and analyzed. The results show that the proposed theoretical model can describe the chemical-mechanical coupling in saturated saline soils and effectively predict the one-dimensional creep behavior.