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A pipe is driven down through a 5m layer of clay (γ = 17 kN/m3) to...

A pipe is driven down through a 5m layer of clay (γ = 17 kN/m3) to an underlying permeable layer. After removing the soil from the pipe, the water level in the pipe eventually rises to 2m above ground level. Calculate the pore water pressure in the clay layer at a depth of 3m below ground level. If the area now becomes flooded to a depth of 1m, what is the pore water pressure in the clay layer at a depth of 3m below ground level? And what is the vertical effective stress in this case?

answers u = 42 kN/m^2 , u = 46 kN/m^2 and vertical effective stress = 15 kN/m^2

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