Numerical evaluation of the bearing capacity factor N'_γ of ring footings

摘要

In this paper, numerical computations using FLAC code are carried out to evaluate the soil bearing capacity factors N'_γ for both smooth and rough ring footings for low and high friction associated and nonasso-ciated Mohr-Coulomb soils. The results indicate a significant decrease in the value of N’_γ with an increase in the ratio of internal radius to external radius of the ring. They also indicate that the soil dilation angle influences the value of N’_γ when the soil displays high nonassociativity for large internal friction angle values. The values of N’_γ for a rough footing base, especially with greater values of φ, are shown to be significantly higher than those for a smooth footing base. The computational results are presented in the form of design tables and graphs, and compared with previous published results available in the literature.