Abstract
Laboratory model test results for the ultimate bearing capacity of two closely-spaced strip foundations on sand have been presented. The model test results have been compared with the theoretical study given by Stuart (1962). The nature of variation of the experimental efficiency factors, α
q and α
r, associated with the bearing capacity factors, N
q and N
r, are similar to those predicted by the theory; however, their magnitudes are substantially lower for S/B<about 3. The foundation settlement at ultimate failure load increases for S/B<4.5 when compared with that of an isolated foundation.
