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Q1. Using the mechanism with three triangular wedges in the figure below, derive an expression for the bearing pressure at collapse of a long strip footing resting on the surface of a uniform clay which can be taken to remain undrained with a shear strength S_u.

1070_Triangular wedges.png

Q2. Using the mechanism shown below, derive the relationship between the forces Q and P assuming that the soil is weightless and has an undrained strength S_u.

393_Triangular wedges1.png

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