A rectangular foundation, 10 x 2m2, is to carry a total uniform pressure of 400 kN/m2 and is to be founded at a depth of 1 m below the surface of a saturated sand of considerable thickness. The bulk unit weight of the sand is 18 kN/m3 and standard penetration tests carried out below the water table indicate that the deposit has an average N value of 15.

If the water table occurs at the proposed foundation depth, determine a value for the settlement of the centre of the foundation. (Use De Beer and Martens' method.)

Answer 40 mm EXERCISE 9.4

A saturated sample of a normally consolidated clay gave the following results when tested in a consolidation apparatus (each loading increment was applied for 24 hours).

Consolidation pressure

Thickness of sample



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