Abstract
Research has been carried out at Université de Sherbrooke since 1975 on the behaviour of agricultural tower silos built in the St. Lawrence Lowlands in the Province of Quebec. The structures considered are built over soft sensitive Champlain Sea clays. The current foundation designs usually rely heavily on qualitative estimations of the performance of previously built silos. Settlement surveys are now available for a 10 year period for 19 silos out of an original group of 28. Sampling and laboratory testing have been carried out at 11 of these locations, while Nilcon vane shear testing has been performed at each site. Settlement and stability calculations have been made. It is thus possible to compare the observed and predicted behaviours of each silo over a substantial period of time. Foundation design recommendations are proposed as a result of these observations. It is shown that the factor of safety against failure can be used as an indicator of settlement behaviour. Key words: case history, settlement, sensitive clays, tower silos.
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