As part of port expansion project, a temporary vertical cut is to be made in a submerged clay deposit. A cross section and soil parameters are shown below. (Note: if needed, you can use a single wedge failure mechanism with an inclination of 45° for the failure surface) Clay c = 450 psf, o = 0° y = 100 pcf H. Note: the slope is submerged a) How deep can you make the cut with a factor of safety of = 1.5 for temporary construction? b) If the project was abandoned after the vertical cut was made, would you still expect the vertical cut to be standing 20 years? Why or why not? Support your answer with calculation.

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A: R=13 mClay 2:cu=25 kPaδ=60°Clay 1:cu=50 kPaδ=40°

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A: Shear strength= 50 kpa  Factor of safety = 1.5

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Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.