Example 8-1 · Strip footing on a c–φ soil
Example 8-1 of Samtani & Nowatzki (2006), Soils and Foundations Reference Manual, Volume II, solved in Rischio and compared with the source's answers.
SourceManual
Samtani, N. C., & Nowatzki, E. A. (2006). Soils and Foundations Reference Manual, Volume II (FHWA-NHI-06-089). Federal Highway Administration. Example 8-1, p. 8-21.
ID fhwa-nhi-06-089-8-1
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Source vs Rischio
| Source | Rischio | Difference | |
|---|---|---|---|
| Bearing capacity factor Nc | 14.8 | 14.8 | +0.2 % |
| Bearing capacity factor Nq | 6.4 | 6.40 | 0.0 % |
| Bearing capacity factor Nγ | 5.4 | 5.39 | −0.3 % |
| Cohesion term, c Nc | 354.31 kPa | 355.14 kPa | +0.2 % |
| Surcharge term, γ Df Nq | 191.52 kPa | 191.50 kPa | 0.0 % |
| Weight term, ½ γ B Nγ | 96.96 kPa | 96.71 kPa | −0.3 % |
AASHTO's 10th edition puts a depth factor dq on the surcharge term, which the 2006 example's equation doesn't carry: the surcharge term is shown without it.