REAPPRAISAL OF CONSOLIDATION PARAMETER USING BACK ANALYSIS

The purpose is to estimate settlement using the measurement data and to verify the application of back analysis by finite element analysis. It is very important to predict settlement in pre-loading method used to improve soft ground. But the settlement measured in the field shows a considerable difference from the predicted settlement due to various factors such as non-homogeneous soft layers,sampling disturbance,erroneous selection of soil parameters and deficiency of consolidation theories among others. Therefore,analysis of actual settlement behavior based on the measurement data during consolidation period is a very useful procedure in evaluating the rates of consolidation settlement. This study estimates settlement using analysis methods such as Hyperbolic,Hoshino and Asaoka method. Because these prediction methods of ultimate primary settlement are analytically simple and economical,they are widely used in the field construction. But these methods can not predict settlement at the phase of design. To search consolidation parameter for site,back analysis technique was performed using finite element analysis. From the results of analysis,the back-analysis technique for consolidation parameter is verified.