- 期刊
BEARING CAPACITY OF STRIP, CIRCULAR AND RING FOOTINGS ON LIMITED DEPTH OF SOIL
摘要
The vertical bearing capacity factors N'_c, N'_q and N'_γ are evaluated using the finite element (FE) method for rough base strip, circular and ring footings resting on c-ϕ soil of limited depth varying from H = 1B to 5B underlain by a rigid rough base. The N'_c, N'_q and N'_γ are also evaluated for rough base ring footing resting on c-ϕ soil of limited depth varying from H = 0.25B to 1B. The Mohr-Coulomb material model is used in the FE analysis and the effect of dilatancy is considered for higher friction angles (ϕ > 30°). Plane strain formulation is used to model strip footing and axisymmetric formulation is used to model circular and ring footings. Appropriate boundary conditions and the size of FE mesh domain are chosen to restrict the development of plastic failure of soil with the FE domain. The present study FE results are observed to compare well with the theoretical and numerical results available in the literature. Based on the outcome of present study, a few suggestions are drawn in regard to the determination of the bearing capacity of footings resting on a limited depth of soil.