Abstract
The performance of low embankments constructed on soft clay foundations both during and folllowing construction has been studied using centrifuge models. Model embankments were constructed during centrifuge operation on foundations prepared with an overconsolidated layer overlaying normally consolidated soil.In one of the model tests the embankment collapsed a short period after the end of construction. Measurement of displacements and excess pore water pressure in the foundation enabled the development of progressive failure to be observed. It was possible to identify zones of high shear strains, indicating the development of a potential slip surface, from equivalent inclinometer plots. Total stress and effective stress analyses of the embankment stability were assessed.Using the technique of staged construction greater embankment heights were safely achieved on an identical foundation. Pore water pressures were observed to rise following the end of construction chiefly as a result of pore pressure spreading. Values of construction pore pressures normalized by the change in vertical effective stress agreed well for each lift. During consolidation maximum horizontal displacements at the embankment toe were proportional centreline settlements.
