A 70-ft long drilled shaft is to be built in the soil shown in the Figure. Toe of the shaft rests on the stiff clay laye

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A 70 Ft Long Drilled Shaft Is To Be Built In The Soil Shown In The Figure Toe Of The Shaft Rests On The Stiff Clay Laye 1 (32.61 KiB) Viewed 43 times

A 70-ft long drilled shaft is to be built in the soil shown in the Figure. Toe of the shaft rests on the stiff clay layer. The shaft will be 5 ft in diameter. Ignore the weight of the shaft and assume the factor of safety is 2: a) Estimate the allowable vertical load (Pallow) that can be placed on the top of the shaft. State your methodology and show your calculations clearly. (20%) b) Sketch on the same diagram (show your calculated values at each point on the diagram) the approximate distributions of vertical load in the shaft as a function of depth for: () Pult applied to the shaft top (15%) (ii) Pallow applied to the shaft top (15%). P Depth Oft Force (lb) Clay S=1000 psf 20 ft 5t - Clay So=1500 psf 45 Ft 70 ft Stiff clay S.=2200 psf Depth (ft)