The 'shear vane test' result needs to be corrected for high plasticity clays using:
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No correction needed for any clay
Bjerrum correction factor μ = f(PI) — vane Su must be reduced for high-plasticity clays to get correct design strength
Only depth correction
Reduction by factor of 10 always
Correct Answer
B. Bjerrum correction factor μ = f(PI) — vane Su must be reduced for high-plasticity clays to get correct design strength
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Vane shear Su (undisturbed) and Sur (remoulded): St = Su/Sur. For high-plasticity clays: Su measured by vane overestimates design Su for stability calculations. Correction factor μ (Bjerrum factor): μ = 1.05 − 0.015 × PI (for PI in %). Corrected Su = μ × Su(vane). Important for slope stability and embankment on soft clay — Bjerrum correction prevents unconservative design.
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