The effect on anisotropy of rotating the principal stress axes during consolidation

摘要

It is well known that K0-consolidated natural sediments have anisotropic strength, yielding and stiffness characteristics, particularly at low overconslidation ratios. For example, the undrained triaxial compression shear strengths developed after K0-consolidation far exceed those available in exten- sion. This paper describes recent hollow cylinder apparatus research into other types of stress-induced anisotorpy, re- porting experiments on dense silt samples that involved rotation of the principal stress axes during consolidation. The results show strikingly different anisotropies from those Developed by K0-consolidated samples. The effective stress Paths chosen for the laboratory studies were guided by the Conditions expected under multi-stage embankments built on Soft ground, but the results have considerable significance in Other practical geotechnical problems.