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The response of surface foundations to large overturning moments is studied under undrained conditions. Rigid circular, strip, and rectangular footings of various aspect ratios are considered, with the soil modeled as an inelastic homogeneous deposit, characterized by an elastic (small-strain) shear  modulus Go, an undrained shear strength Su, and a G/Go versus c curve appropriate for medium- plasticity clays. Three stages of foundation performance, ranging from the  initial elastic fully - bonded  response, to the nearly - elastic but nonlinear response with the foundation partially detaching and  uplifting from the soil, and finally to the ultimate stage where full mobilization o fsoil bearing failure mechanisms develop. Simple to use formulas or charts are developed for all stages of response in terms of dimensionless parameters, prominent among which is the static factor of safety against bearing - capacity failure under purely vertical loading.

Soil Dynamics and Earthquake Engineering
School of Civil Engineering, Geotechnical Department, National technical University of Athens,
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