Experimental Analysis of Stress-strain Hysteresis Loops in Saturated Soft Clay Soils under Variable Frequency Traffic Loading

In the past, scholars often used single-frequency traffic load form to study the dynamic characteristics of soil, but in the actual engineering context, because public transportation in the process of driving will produce variable speed driving and thus lead to the characteristics of the frequency is not unique, for the Zhoushan area marine soft clay soil, using Wille dynamic triaxial instrument to carry out a series of undrained triaxial test, study the combination of frequency on the dynamic stress of soft clay soil. The effect of combined frequency on the dynamic stress-strain hysteresis loops of soft clay soils was investigated. The results show that the combined frequency has a significant effect on the strain characteristics of the soil. There is a significant difference compared with the single-frequency mode. The stress-strain hysteresis loops in the combined frequency mode show the characteristics of sparse first and then dense, and the loading form of combined frequency can be closer to the actual engineering.