Question

6-12 Use Coulomb's method to determine the magnitude and direction of the total lateral force against the retaining wall of problem 6-5. Assume the friction angle between the wall and the soil to be 2/3*phi. Make one trial only, using an assumed failure surface at an angle of 60 degrees from horizontal.

Problem 6-5 is: Use Rankine's method to determine the magnitude and location of the resultant active force against a retaining wall 6 m high. There is a water table 2.5 m below the top of the wall and the backfill supports a uniform surcharge of 30 kN/m². The backfill material is sand with a friction angle, phi, of 35°, a unit weight above the water table of 18.7 kN/m³, and a saturated unit weight of 21.2 kN/m³

Answer 1