Cantilever retaining wall with wet backfill material
Cantilever retaining wall with wet backfill material
(OP)
Hello,
We are looking to design a cantilever retaining wall as efficiently as possible out of reinforced concrete. Pah (Active) is the active horizontal component of the soil pressure behind the wall. In our situation, the backfill soil contains water and has a density of 138 pcf.
My question is this: if we use porous backfill material up against the wall (first 18" against the wall) with perforated drain tile to remove hydrostatic pressure, must we assume a high Pah such as 45 pcf (from the wet soil) or can we assume that the porous material will allow the water to drain off so we can use a lower Pah such as 30 pcf? 30 pcf is a value we see for dry backfill material.
I hope I stated this clearly. Thanks for your help.
We are looking to design a cantilever retaining wall as efficiently as possible out of reinforced concrete. Pah (Active) is the active horizontal component of the soil pressure behind the wall. In our situation, the backfill soil contains water and has a density of 138 pcf.
My question is this: if we use porous backfill material up against the wall (first 18" against the wall) with perforated drain tile to remove hydrostatic pressure, must we assume a high Pah such as 45 pcf (from the wet soil) or can we assume that the porous material will allow the water to drain off so we can use a lower Pah such as 30 pcf? 30 pcf is a value we see for dry backfill material.
I hope I stated this clearly. Thanks for your help.





RE: Cantilever retaining wall with wet backfill material
f-d
¡papá gordo ain’t no madre flaca!
RE: Cantilever retaining wall with wet backfill material
RE: Cantilever retaining wall with wet backfill material
RE: Cantilever retaining wall with wet backfill material
RE: Cantilever retaining wall with wet backfill material
"The placement of a foot or more of gravel behind the wall creates the need for averaging the Φ values of the gravel and the
backfill with respect to the wall."
Applying this suggestion to our design, we would use an average of 30 and 45 pcf for the Pah value.
RE: Cantilever retaining wall with wet backfill material