Practice Question: Slope Stability

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Solution

Answer: B) F = 2.33

Refer to PE Civil Reference Handbook Section 3.6.4

For infinite dry sand soil slopes, the Factor of Safety (F) with no pore water pressure should be calculated according to the following equation.

\[F = \frac{tan \phi'}{ tan \beta}\]

where:

\(\phi' \text{= effective angle of friction. }\)

\(\beta = horizontal\ angle\ of\ slope. \\\)

\[F = \frac{tan\ 32}{tan\ 15} = 2.33\]

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