Abstract
In this study, changes of deformability and permeability in the artificial test pieces were experimentally investigated by using triaxial compression testing machine. The deformation type, opening shear fracture and coherent shear band, was controlled by preconsolidation pressure and/or confining pressure. In addition, using Micro-focus X-ray and thin section observation techniques, the detailed data of internal structure were obtained. The porosity of coherent shear band was lower than that in the undeformed specimen and the particle-crushing was not found in coherent shear band. Therefore, the reduction of porosity in coherent shear band could be caused by the shearing consolidation and becoming dense. It is suggested that the coherent shear band in porous sand sediments is able to have ability of the sediment to seal water.
