The Growth of Slip Surfaces in the Progressive Failure of Over-Consolidated Clay

摘要: In heavily over-consolidated clays there is a marked peak in the observed relation between shear stress and strain. As strain increases, falls from to much smaller residual stress. Slopes made such clay often fail progressively many years after construction. Sliding occurs on concentrated slip surface, it found that mean resolved surface markedly less than strength. Concepts fracture mechanics, particular J -integral, are used derive conditions for propagation of band this kind. The results indicate presence strong size effect, which has important implications use models soil mechanics. An elastic analysis makes possible determine end zone its value. attempt assess sources time-dependence governing speed band. They include pore-water diffusion dilating tip (which governs rate at local strength reductions can occur), viscoelastic deformation allows gradual build-up concentration band), weathering break-down diagenetic bonds.