Abstract
The ultimate uplift capacity of augered footings in relatively insensitive and intact clays is computed on the basis of the undrained shear strength of clay. Fissured clays, which may be the result of surface desiccation or preconsolidation, give different values of strength according to the type of test and size of specimen used. The actual strength mobilized in this type of clay under uplift loads was determined by a number of full-scale tests performed on both belled and straight-sided footings. These tests showed that the uplift strength mobilized in fissured clay was only one-third of its intact strength and very nearly equal to its undrained residual or fissured strength. Soil strains adjacent to the belled footings indicated a complex failure mechanism which varied with depth of the foundation. The uplift resistance of straight-sided footings was found to be largely the result of adhesion between the soil and the footing.
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