........

As before draw Mohr circles C'I' CI'2 and CI'3 for each of the specimens as shown in Fig. Ex. 8.10. Now from the figure

Example 8.11 A soil has an unconfined compressive strength of 120 kN/m2• In a triaxial compression test a specimen of the same soil when subjected to a chamber pressure of 40 kN/m2 failed at an additional stress of 160 kN/m2• Determine:

(i) The shear strength parameters of the soil, (ii) the angle made by the failure plane with the axial stress in the triaxial test.