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Determine the cohesion and the angle of friction of the soil, with respect to total stress.

Solution

In this case both the normal and the shear stresses at failure are known, so there is no need to draw stress circles and the four failure points may simply be plotted. These points must lie on the strength envelope and the best straight line through the points will establish it (Fig. 3.12). From the plot, cu = 55kN/m2; 4>u = 23°.

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