12.6 Consider the silty clay soil in Problem 12.4. If a consolidated drained triaxial test is conducted on the same soil with a chamber-confining pressure of 105 kN/m2 , what would be the deviator stress at failure?

 

2 m G.W.T 2.2 m Silty sand e 0.72; G, 2.69 5.25 m 2.6 m 3.5 m Silty clay w=22%; G, = 2.72 Poorly graded sand Yum 19.8 kN/m Figure 12.54 Following are the results of four drained, direct shear tests conducted on the clay samples with each having a diameter of 63.5 mm and height of 32 mm. Test Normal force Shear force at failure no. (N) (N) 1234 1 84 28.9 168 59.6 254 89.1 360 125.3