11-4. What is the total active earth pressure per foot of wall for the wall shown in Figure 11-39, using Rankine theory? 15 ft B=15° Y = 125 lb/ft³ 6-30° c=0 100° FIGURE 11-39 11-7. What is the total active earth pressure per foot of wall for the retaining wall in Problem 11-4, with an angle of wall friction between backfill and wall of 25°, using Coulomb theory? 11-7a. Assume that the base of the wall is 4 feet wide, and the wall is constructed of reinforced concrete (unit weight of 150 pounds per cubic foot). Using the same angle of friction between the backfill and the wall as the friction between the bottom of the wall and the underlying soil (assume the same soil parameters shown in Figure 11-39), determine the Factor of Safety of the Retaining Wall for SLIDING and OVERTURNING.

Fig: 1