Anisotropy of consolidation parameters in artifically sedimented clays

摘要

The stability of an earth structure on soft clay foundations is influenced by the stress-strain behaviour, drainage conditions and the associated failure mechanisms of the clay. The rapid increase of pore water pressure during construction, and the subsequent slow rate of pore pressure dissipation are often the main factors that dictate soft clay failure. Subsequently, ground improvement methods such as the use of prefabricated vertical drains (PVD) are becoming more popular for stabilisation of these soils. Calculations of soil behaviour commonly utilize the assumption of soil as an isotropic material regardless of the widely documented reality that soft clays exhibit significant anisotropy. The consolidation and permeability characteristics of two artificial clays were investigated within this study through a series of oedometer tests. These tests were conducted on both horizontally and vertically cut specimens, and values for anisotropy detailed. Such results will be helpful in approximating the anisotropy present in natural soils of similar plasticity.