According to CBC Chapter 18, what is the maximum slope allowed for permanent cut slopes in ordinary soil without requiring engineering analysis?
Correct Answer
D) 2:1 (26.6 degrees)
CBC Section 1808.7.5 establishes that cut slopes in ordinary soil shall not be steeper than 2 horizontal to 1 vertical (2:1) unless supported by engineering analysis. Steeper slopes require geotechnical engineering evaluation and may need retaining structures or slope stabilization measures.
Why This Is the Correct Answer
CBC Section 1808.7.5 establishes that cut slopes in ordinary soil shall not be steeper than 2 horizontal to 1 vertical (2:1) unless supported by engineering analysis. Steeper slopes require geotechnical engineering evaluation and may need retaining structures or slope stabilization measures.
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