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Chen, Yon-Nein. Ph.D., Purdue University, December 1973. Prediction of Long Term Deformation of a Compacted Cohesive Soil Embankment Over a Soft Foundation. Major Professor: Dr. William H. Perl off. The study is concerned with prediction of the long-term deformation of a compacted cohesive soil embankment over a soft foundation. The prediction of embankment performance was made using the finite element method of analysis incorporating a nonlinear viscoelastic model of the fill behavior and a quasi-elastic representation of the foundation. A full-scale test embankment was constructed and instrumented to permit evaluation of the predictive approach. Samples of the subsurface and the embankment material were tested in the laboratory to determine numerical values of desired material parameters. The performance of the test embankment was monitored both during and after its construction. Instrumentation included spiral-foot settlement gauges, slope indicators and total pressure plates. These functioned satisfactorily, and the measurements obtained were of sufficient accuracy except for a few instruments. Hydraulic settlement gauges were also used. They have many advantageous features, but these were outweighed by the temperature sensitivity which was a significant problem during cold weather. The observed results were compared with the theoretical predictions, Variations from the predicted behavior were interpreted in light of the relation between the assumptions of the analysis and the real field conditions. Primary emphasis was on predicting those movements resultinc from long-term deformations of the compacted clay fill. The calculated results are fairly close to the field measurements. CHAPTER