45 Ootan (15 + + 2etan(+5 + ) Gotan 45- – 2c tan 45 Subject: Geotechnics…

45 Ootan (15 + + 2etan(+5 + ) Gotan 45- – 2c tan 45 Subject: Geotechnics I (BFC 21702) Tutorial: CHAPTER 6 (Shear Strength) O: +00:- 2 cos 20 1. The following are the results of four drained direct shear tests on undisturbed normally consolidated clay samples having a diameter of 50 mm and height of 25 mm. Test no. 1 2 3 Normal force (N) Shear force at failure (N) 250 139 375 209 450 250 540 300 i) Draw a graph of shear stress at failure against the normal stress and determine the and c’. ii) For a normal force of 400N, what shear force is required to cause failure? iii) If a drained triaxial test is conducted on the same soil with a confining pressure of 210 kN/m, what would be the deviator stress at failure? iv) Based on (iii), what is the inclination of the failure plane with the major principle plane? v) Based on (iii), determine the normal and shear stress on a plane inclined at 30 with the major principle plane at failure. 2. The undisturbed soil samples were collected from a 5 m thick saturated clay in the field (Ysat = 18 kN/m). A consolidated drained triaxial test was conducted on a normally consolidated clay with a confining pressure, 63 = 172 kN/m. The deviator stress at failure, (Ad)r=227 kN/m. Determine: i) The angle of friction, ii) The angle that the failure plane makes with the major principle plane iii) The normal stress and the shear stress on the failure plane iv) The shear strength in the middle of the clay layer.

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