Experimental Study on the Dynamic Rebound Modulus and California Bearing Ratio (CBR) Characteristics of Coarse-grained Chlorine Saline Soils and Evaluation of Road Performance

To explore the control indexes of coarse-grained chlorine saline soils used as subgrade fillings, a series of indoor dynamic triaxial tests and CBR tests are conducted. And then the evolution law of the dynamic rebound modulus and CBR of coarse-grained chloride saline soils is analyzed under the conditions of different stress levels, water content, and salt content. Finally, based on the experimental data, a prediction model of the road performance index is proposed and the salt content threshold values of coarse-grained chloride saline soils used as subgrade fillings are calculated at different depths. The results of the study provide a solid support for the use of coarse-grained chloride saline soils as subgrade fillings.