Ultimate Settlement and Coefficient of Consolidation Under Radial Drainage Using Non-linear Regression Analysis

To minimize the post-construction settlement in clayey soil one of the effective methods used is pre-compression after providing vertical drains. The coefficient of radial consolidation (c<inf>h</inf>) of the soil is essential for assessing the consolidation time needed while incorporating vertical drains. In the present study, an effort was made to find the radial coefficient of consolidation (c<inf>h</inf>) and the ultimate settlement (S<inf>f</inf>) values using non-linear regression analysis. The experimental data was obtained by conducting a radial consolidation test, using two different oedometers of different sizes. Undisturbed soil samples of Cochin Marine clay (CMC), which was retrieved from a depth of 12 m, and reconstituted samples of IIT lake clay and Bombay marine clay (BMC) were used for the analysis. The values of S<inf>f</inf> and c<inf>h</inf> obtained from the analysis match well with the existing methods like the rectangular hyperbola method and Asaoka’s method.