ABSTRACT
Active Earth Pressure-Backfill Soil Submerged with the Surface Horizontal When the backfill is fully submerged, two types of pressures act on wall AB. (Fig. 11.9) They are
1. The active earth pressure due to the submerged weight of soil 2. The lateral pressure due to water
At any depth z the total unit pressure on the wall is
At depth z = H, we have
Pa =ybHKA +YwH
where Yb is the submerged unit weight of soil and Yw the unit weight of water. The total pressure acting on the wall at a height H/3 above the base is
(11.17)
Active Earth Pressure-Backfill Partly Submerged with a Uniform Surcharge Load The ground water table is at a depth of HI below the surface and the soil above this level has an effective moist unit weight of y. The soil below the water table is submerged with a submerged unit weight Yb. In this case, the total unit pressure may be expressed as given below.
