AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

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A cohesive soil has an unconfined compressive strength of 1.8 tsf, but it is fissured and a vibratory roller is working next to the shaft. How should it be classified for OSHA sloping?

Stable rock Type A, because 1.8 tsf exceeds 1.5 tsf Type A short-term regardless of vibration Not Type A; fissuring and vibration remove Type A status even if strength is 1.5 tsf or greater

Correct Answer:

Not Type A; fissuring and vibration remove Type A status even if strength is 1.5 tsf or greater

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