Local Softening Characteristic of Soft Clay Subjected to Dynamic Loading Under Low Confining Pressure

In this study, the local softening characteristic of saturated soft clay was examined through a series of dynamic triaxial test under varying confining pressures. Additionally, the stress strain relationship and pore water pressure development during the process of softening zone formation were recorded. Using the energy based pore pressure model, it has been seen that the pore water pressure and energy dissipation has very good correlation for saturated sands and silty soils. The experimental results prove that the local softening and the development of pore water pressure have a good correlation. The different dynamic stress makes the soil sample to reach the same damage level. The softening area made by the smaller dynamic stress is more clear and concentrated than larger stress.