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3 m ×3 m footing is to be built on the surface of a 15 m thick layer of unsaturated sand. The sand is underlain by a very dense gravel layer. The water table is at a great depth. The sand is relatively uniform and in situ testing indicates it has a constrained modulus of 10 MPa. The footing load is 200 kN. Compute the settlement under the center of the footing.

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