PE practice problem (retaining wall)
PE practice problem (retaining wall)
(OP)
Hello,
See attachment. The provided solution shows the specific weight of water subtracted from the specific weight of the soil (highlighted) in determining the active soil pressure below the water table. Should it not be the specific weight of water subtracted from the saturated soil specific weight.
Is the provided solution incorrect or am I confused? Thank you in advance.
See attachment. The provided solution shows the specific weight of water subtracted from the specific weight of the soil (highlighted) in determining the active soil pressure below the water table. Should it not be the specific weight of water subtracted from the saturated soil specific weight.
Is the provided solution incorrect or am I confused? Thank you in advance.





RE: PE practice problem (retaining wall)
RE: PE practice problem (retaining wall)
The problem provided the void ratio; the original author expected with this you should apply soil relationships to calculate the volume of solids & volume of voids, then the saturated unit weight.
I find that the specific gravity of solids is 2.64, and the saturated unit weight is 124.6 pcf. That value rather than 100 pcf should have been used to determine P2.