Prediction and Control of Field Swell Pressures of Compacted Medium Plastic Clay

摘要

This study investigates the swelling pressure response of a medium plastic clay (AASHTO A-6) compacted both in the field and in the laboratory. Correlation was attempted to provide a prediction process for the field result. Swelling pressure was controlled by water content deviation from optimum, compactive effort, dry density, and various interactions among these terms. Regression models for laboratory and field results are different. Variability in dry density and swelling pressure was sizeable but predictable, with the field variability being larger. Prediction models were developed for expected average and maximum swelling pressure. Charts enable the engineer to select the compaction variables that will control the swelling pressure to a desired maximum value. A computer program creates tabulations allowing the prediction of maximum swelling pressure for a field soil knowing inspection testing results.