Energy-based model of vibration-induced pore water pressure build-up of saturated loose sand under complex stress condition

The newly developed static and dynamic universal triaxial and torsional shear apparatus was used to perform different types of experimental test of saturated Fujian loose sand.The samples were subjected to cyclic torsional shear and cyclic vertical-and-torsional coupling shear with rotation of principal stress axes under isotropic consolidation as well as cyclic torsional shear under anisotropic consolidation condition with different initial consolidation parameters.The influence of cyclic shear stress path,orientation of initial major principal stress,initial ratio of deviatoric stress and initial coefficient of intermediate principal stress on the empirical relationship between vibration-induced pore water pressure and the accumulative energy dissipation during cyclic shear was investigated.The energy-based model of pore water pressure development for saturated loose sand under complex stress condition was preliminarily established.