Example 10-3 · Cantilever wall stability
Example 10-3 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 10-3, p. 10-52.
ID fhwa-nhi-06-089-10-3
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Source vs Rischio
| Source | Rischio | Difference | |
|---|---|---|---|
| Active earth pressure coefficient, Ka | 0.35 | 0.35 | −0.1 % |
| Active thrust, Pa | 139.58 kN/m | 139.37 kN/m | −0.1 % |
| Its horizontal part, Ph | 137.46 kN/m | 137.25 kN/m | −0.1 % |
| Its vertical part, Pv | 24.24 kN/m | 24.20 kN/m | −0.2 % |
| Height of Pa above the base | 2.216 m | 2.215 m | −0.1 % |
| Weight of the stem | 76.84 kN/m | 76.84 kN/m | 0.0 % |
| Weight of the base | 65.96 kN/m | 65.96 kN/m | 0.0 % |
| Arm of the base's weight about the toe | 1.996 m | 1.996 m | 0.0 % |
| Weight of the soil over the heel | 267.48 kN/m | 267.47 kN/m | 0.0 % |
| Weight of the wall and the soil, W | 410.28 kN/m | 410.26 kN/m | 0.0 % |
| Moment of W about the toe, Mw | 942.5 kN·m/m | 942.4 kN·m/m | 0.0 % |
| Vertical forces, ΣV | 434.51 kN/m | 434.46 kN/m | 0.0 % |
| Net moment about the toe, ΣMR − ΣMO | 734.68 kN·m/m | 735.09 kN·m/m | +0.1 % |
| Resultant's distance from the toe, d | 1.692 m | 1.692 m | 0.0 % |
| Eccentricity, e | 0.3048 m | 0.3045 m | −0.1 % |
| Mean pressure under the base, ΣV/B | 108.82 kPa | 108.81 kPa | 0.0 % |
| Maximum pressure under the base, qmax | 158.87 kPa | 158.60 kPa | −0.2 % |
| Minimum pressure under the base, qmin | 58.76 kPa | 59.02 kPa | +0.4 % |