A vertical retaining wall 25 feet high supports a deposit of sand having a level backfill. Soil properties are as follows:

unit weight=120 lb/cubic foot

angle of internal friction=35 degrees

c=0

Calculate the total active earth force per foot of wall and its point of application from the base of the wall. Use Rankine theory.

Calculate the total active earth force per foot of wall if the angle of wall friction between backfill and wall is 20 degrees.

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