Undrained Cylindrical Cavity Expansion in Critical State Soils Considering Soil Structure

Abstract

A closed form method of analysis is proposed to predict the stresses and pore water pressure developed in soil mass due to the expansion of cylindrical cavity in undrained condition. Often Modified Cam Clay model (MCC) has been used to describe soil behavior, but unfortunately MCC formulation does not include soil structure. To study the effect of soil structure during cylindrical cavity expansion Structured Cam Clay model has used to describe yield surface and flow rule. It is assumed that the expansion of cavity occurs under condition of plane strain. The evaluation of present method illustrates a good comparison with observations made from field. It is also observed that soil structure affect significantly to the distribution of stresses and pore water pressure during expansion of cylindrical cavity.