The 'Hvorslev parameters' c_e and φ_e in soil mechanics refer to:
Choose the correct answer
Compression index and swelling index
True intrinsic cohesion and friction at constant void ratio — separates structural effects from actual soil properties in OC clay
Grain size parameters d10 and d60
Hydraulic conductivity in two directions
Correct Answer
B. True intrinsic cohesion and friction at constant void ratio — separates structural effects from actual soil properties in OC clay
Why is this the answer?
Hvorslev (1937): true (intrinsic) cohesion c_e and true angle of friction φ_e of soil. From drained tests on OC clay: failure envelope in (e, σ') space rather than simple Mohr-Coulomb in (τ, σ') space. The apparent c in Mohr-Coulomb is due to overconsolidation (structure/cementation). At same void ratio: τf = c_e + σ'×tanφ_e (Hvorslev). Shows that φ_e is nearly constant; OCR controls apparent cohesion.
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