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Determine the effective stress increase in the soil at a depth of 4 m below the...

Determine the effective stress increase in the soil at a depth of 4 m below the footing of area 3 x 5 m2 under an axial load of 4500 kN. Also determine the increase in the stress due to a drop of the water table from originally 1 m below the footing to 5 m below the footing bottom.

Please help me with this question with graph and calculation details, thanks.

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