he equation of the effective stress failure envelope for a loose sandy soil was obtained from a direct shear test as Ss = Sn tan 36 degrees; where Ss is shearing stress, Sn is normal stress. A drained triaxial test was conducted with the same soil at a chamber confining pressure of 15 lb/in^2. 1. Estimate the angle that the failure plane makes with the major principal plane. a. 63 degrees b. 54 degress c. 45 degrees d. 36 degrees 2. Determine the normal stress on the plane that makes an angle of 25 degrees with the major principal plane. a. 61.24 lb/in^2 b. 50.14 lb/in^2 c. 13.15 lb/in^2 d. 16.39 lb/in^2 3. Determine the shear stress (when the specimen failed) on the plane that makes an angle of 25 degrees with the major principal plane. a. 61.24 lb/in^2 b. 50.14 lb/in^2 c. 13.15 lb/in^2 d. 16.39 lb/in^2
The equation of the effective stress failure envelope for a loose sandy soil was obtained from a direct shear test as Ss = Sn tan 36 degrees; where Ss is shearing stress, Sn is normal stress. A drained triaxial test was conducted with the same soil at a chamber confining pressure of 15 lb/in^2.
1. Estimate the angle that the failure plane makes with the major principal plane.
a. 63 degrees
b. 54 degress
c. 45 degrees
d. 36 degrees
2. Determine the normal stress on the plane that makes an angle of 25 degrees with the major principal plane.
a. 61.24 lb/in^2
b. 50.14 lb/in^2
c. 13.15 lb/in^2
d. 16.39 lb/in^2
3. Determine the shear stress (when the specimen failed) on the plane that makes an angle of 25 degrees with the major principal plane.
a. 61.24 lb/in^2
b. 50.14 lb/in^2
c. 13.15 lb/in^2
d. 16.39 lb/in^2
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