A retaining wall 6m high supports a backfill with a surcharge angle of 10°. The back of the wall is inclined to the vertical at a positive batter angle of 5°. If the angle of wall friction is 7°, then the resultant active earth pressure will act at a distance of 2 m above the base and inclined to the horizontal at an angle of_________________?

Related Mcqs:

1. A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m2 when it was laterally unconfmed. The failure plane was inclined to the horizontal plane at an angle of 45°. The values of cohesion and angle of internal friction for the soil are respectively______________________?

   A. 0.5 N/mm2 and 30°
   B. 0.05 N/mm2 and 0°
   C. 0.2 N/mm2 and 0°
   D. 0.05 N/mm2 and 45°

2. The major principal stress in an element of cohesionless soil within the backfill of a retaining wall is________________?

   A. vertical if the soil is in an active state of plastic equilibrium
   B. vertical if the soil is in a passive state of plastic equilibrium
   C. inclined at 45° to the vertical plane
   D. none of the above

3. The coefficient of active earth pressure for a loose sand having an angle of internal friction of 30° is___________________?

   A. 1/3
   B. 3
   C. 1
   D. 1/2

4. Rankine’s theory of earth pressure assumes that the back of the wall is_______________?

   A. plane and smooth
   B. plane and rough
   C. vertical and smooth
   D. vertical and rough

5. If a cohesive soil specimen is subjected to a vertical compressive load, the inclination of the cracks to the horizontal is__________________?

   A. 90°
   B. 45°
   C. 22.5°
   D. 0°

6. The angle that Coulomb’s failure envelope makes with the horizontal is called________________?

   A. cohesion
   B. angle of internal friction
   C. angle of repose
   D. none of the above

7. During the first stage of triaxial test when the cell pressure is increased from 0.10 N/mm2 to 0.26 N/mm2, the pore water pressure increases from 0.07 N/mm2 to 0.15 “N/mm2. Skempton’s pore pressure parameter B is___________________?

   A. 0.5
   B. -0.5
   C. 2.0
   D. – 2.0

8. Coefficient of earth pressure at rest is__________________?

   A. less than active earth pressure but greater than passive earth pressure
   B. greater than active earth pressure but less than passive earth pressure
   C. greater than both the active earth pressure and passive earth pressure
   D. less than both the active and passive earth pressures

9. In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as__________________?

   A. consolidated drained test
   B. consolidated undrained test
   C. unconsolidated drained test
   D. unconsolidated undrained test

10. If the shearing stress is zero on two planes, then the angle between the two planes is________________?

    A. 45°
    B. 90°
    C. 135°
    D. 225°