For a strip footing on cohesive-frictional soil with phi = 0 (saturated clay in undrained condition), the net ultimate bearing capacity per unit area is:
Choose the correct answer
qu_net = c x Nc = 5.14c (Nc = 5.14 for phi=0)
qu_net = 0 (no bearing capacity)
qu_net = q x Nq
qu_net = c Nc + q Nq + 0.5 gamma B Ngamma
Correct Answer
A. qu_net = c x Nc = 5.14c (Nc = 5.14 for phi=0)
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For phi = 0 (undrained loading of saturated clay): Nc = 5.14 (Terzaghi) or 5.7 (Skempton modified for strip footing), Nq = 1, Ngamma = 0. Net qu = c x Nc = 5.14c or 5.7c (strip). For square footing: qu_net = 7.4c (Skempton). qu/FOS = allowable net bearing capacity. Used in short-term stability of clay foundations.
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