The 'coefficient of earth pressure at rest' K0 for normally consolidated soil is approximately:
Choose the correct answer
K0 = 1.0 always (equal to vertical stress)
K0 = 1 − sinφ' (Jaky) for NC soil — for OC: K0 increases with OCR
K0 = Ka (active earth pressure coefficient)
K0 = 0 for all clays
Correct Answer
B. K0 = 1 − sinφ' (Jaky) for NC soil — for OC: K0 increases with OCR
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Jaky (1944): K0 = 1 - sinφ' (empirical for NC soil). For φ'=30°: K0 = 0.5. For φ'=25°: K0 = 0.577. For OC soil: K0_OC = K0_NC × √OCR (Mayne-Kulhawy). K0 used in: lateral earth pressure for retaining walls (at-rest condition if no wall movement), K0-consolidated triaxial tests, deep excavation design. K0 = 0.4–0.7 for most natural deposits.
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