A 4.5 m high retaining wall is supporting a horizontal backfill having a unit weight of 15.7 kN/m^3 and a saturated unit weight of 19.3 kN/m^3. Groundwater table is located 3m below the ground surface. Drained friction of angle for the backfill is 30 degrees. The wall is restrained from yielding. The soil has an over consolidated ratio of 2.
a. Compute the total force per unit length of wall for at rest condition.
b. Compute the location of the resultant force.
c. Compute the moment at the base due to this force.
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