Abstract:Based on dynamic triaxial tests conducted on tailings sands under different consolidation conditions,the developing characteristics of dynamic pore water pressure and residual deformation of tailings sand are studied. It is indicated that:(1) The relationship between pore water pressure ratio and cyclic times ratio is affected by the variation of confining pressure and dynamic stress very little,but it is influenced by consolidation stress ratio. (2) The curve shape of pore water pressure developing under isotropic consolidation is not the same as that under anisotropic consolidations. The relationship of pore water pressure ratio and cyclic times ratio could be described by modified Seed¢s dynamic pore water pressure model under isotropic consolidations,but by exponential function under anisotropic consolidations. (3) The great residual strain is generated under not only anisotropic but also isotropic consolidation. The relationship between residual strain ratio and cyclic times ratio. is not influenced too much by the variation of confining pressure or dynamic stress,but influenced by the consolidation stress ratio. (4) The curve shape of residual strain developing under isotropic consolidation is not the same as that under anisotropic consolidations. The relationship of residual strain ratio and cyclic times ratio could be described by arcsine function under isotropic consolidations,and by power function under anisotropic consolidations.