Question

Terzaghi's bearing capacity factors depend on-
1. Uniformity coefficient of soil and dry density of soil
2. Coefficient of curvature of soil and bulk density of soil
3. Angle of internal friction of soil only
4. Angle of internal friction of soil and depth of foundation

Answer 1

Correct Answer - Option 3 : Angle of internal friction of soil only

Terzaghi’s bearing capacity factors - N_c, N_q, N_γ depend on the angle of internal friction only and are dimensionless.

\({N_q} = \left[ {\frac{{{a^2}}}{{2{{\cos }^2}\left( {45 + \frac{\phi }{2}} \right)}}} \right]\)

Here \(a = {e^{\left( {\frac{{3\pi }}{4} - \frac{\phi }{2}} \right)\tan \phi }}\)

N_c = (N_q - 1) cot ϕ

\({N_\gamma } = \frac{1}{2}\left[ {\frac{{{K_p}}}{{{{\cos }^2}\phi }} - 1} \right]\tan \phi \)

Here \({K_p} = \frac{{1 + \sin \phi }}{{1 - \sin \phi }}\)