Many experimental researches have been carried out to examine bearing capacity of spread foundations. On the other hand, although many numerical analyseis have been also reported, most of them have resulted in in poor predictions of localized deformation patterns and their developments. except a few studies with softening effects or a double-slip theory. We here employ the double-slip theory as well as a non-coaxial plasticity to simulate numerically developments of the deformation localization under spread foundations. In particalar main focus is put on effects of internal friction. Some of the numerically obtained patterns of the localizations are in good agreement with the experimental observations.

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