Stiffness anisotropy of London Clay and its modelling: Laboratory and Field

摘要

Anisotropic behaviour of London Clay is examined. Undrained and drained triaxial tests were performed on rotary cored London Clay samples obtained from Kennington, London and the results are compared with published laboratory and in-situ testing data. The measured anisotropic behaviour is then modelled by incorporating transverse anisotropic elasticity into a critical state soil model. A smooth transition from elastic to plastic behaviour is modelled by the subloading surface concept. The model is implemented into a finite element (FE) program and ground response induced by tunnel excavation is simulated in 2D and 3D conditions. The effects of soil anisotropy on ground deformation and excess pore pressure generation are discussed.