Laboratory tests and theoretical model for dynamic resilient modulus of coarse-grained chlorine saline soil

To explore the influences of load, salinity and humidity on the dynamic resilient modulus of coarse-grained chlorine saline soil, the dynamic rebound characteristics of the soil under different stresses, salt contents and water contents are studied based on the laboratory dynamic triaxial tests. The measured results reveal that the value of the dynamic resilient modulus inceases with the increase of the confining pressure and bulk stress, and decreases with the increase of the partial stress, salinity and moisture. The higher the salt content and moisture content in the soil, the more obvious the influences of the confining pressure, partial stress and bulk stress on its dynamic resilient modulus. Under the same stress, the value of the dynamic resilient modulus decreases more considerably with the increase of the salt content and moisture content, and the effects of salt tend to be more significant than those of water. Through the regression analysis of the test data based on a three-parameter theoretical model, the proposed model has a preferably higher determination coefficient, and the formula for predicting the model parameters with high precision is established. It is shown that the theoretical model is suitable to predict the dynamic resilient modulus of coarse-grained chlorine saline soil.