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40.7 (failure)

By considering a point at the centre of the clay and below the centre of the foundation, draw the effective stress paths for undrained shear obtained from the tests and indicate the effective stress paths for the immediate and consolidation settlements that the foundation will experience.

Assume that K0 = 1 — sin (j> and determine an approximate value for the immediate settlement of the foundation.

Solution

The first step is to plot out the two effective stress paths. The calculations are best set out in tabular form:

Cell pressure = 35kN/m2

Strain

~ <>3

u

c\ - C3 2

~ 2

0 0

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