INFLUENCE OF THE FOUNDATION WIDTH ON THE BEARING CAPACITY FACTOR

概要

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As shown by de Beer, the bearing capacity factor N_γ decreases with increasing foundation width. It is demonstrated that this scale effect can largely be attributed to the influence of pressure level on the friction angle φ. By means of improved triaxial tests with large samples, an empirical relation is proposed among the angle of friction, φ, and the pressure level, for different sands. Below a threshold value, φ is pressure independent ; a power law is adopted above this value. An empirical formula for the dependence of N_γ on φ is proposed. The calculation procedure is based on a proposal by Meyerhof. The mean foundation pressure is approximately proportional to the pressure level in shear tests giving the mean value of the friction angle in the calculation of N_γ. The proposal is examined by published results of numerous foundation tests at small and at large scale. These tests were performed at 1g gravity and at ng in the centrifuge. A detailed analysis of progressive failure is largely circumvented, as justified from the evidence of the presently available experimental data.
社団法人地盤工学会の論文
1988-12-15