Effect of Non-Linear Consolidation for Radial Flow on Pore Pressure Dissipation

摘要

Installation of vertical drains with surcharge loads is one of the widely used methods of soft ground improvement. The drains accelerate the rate of consolidation by shortening the drainage path considerably. The conventional radial consolidation theory used often to predict the behavior of the vertical drains in soft clays is based on linear void ratio-effective stress relationship. A theory for consolidation with radial flow is developed considering the linear e - logo' relationship but assuming the coefficient of consolidation to be constant (Davis and Raymond 1965) and the results compared with the conventional radial consolidation theory proposed by Barron. The degrees of settlement predicted by both linear and non-linear theories are identical. However the rate of dissipation of pore pressure is shown to be dependent on the stress increment ratio.