Vertical component of active pressure in retaining walls
Vertical component of active pressure in retaining walls
(OP)
This was discussed once on thread507-128311, but I'm not sure what to conclude about it. Enercalc gives the option of using the vertical component of active pressure for retaining wall stability calculations. Their structural engineer says there is some disagreement about using it in the literature. My plan checker won't allow using it unless I can justify it. Does anyone have an insight to whether to use the Enercalc option or not?
Thanks
Thanks





RE: Vertical component of active pressure in retaining walls
RE: Vertical component of active pressure in retaining walls
RE: Vertical component of active pressure in retaining walls
RE: Vertical component of active pressure in retaining walls
RE: Vertical component of active pressure in retaining walls
RE: Vertical component of active pressure in retaining walls
I'm trying to picture the location of the active vertical component. It seems to be acting on the stem, pushing it downwards. Is that where it is?
RE: Vertical component of active pressure in retaining walls
Yes, on the back face of the stem.
Jeff
RE: Vertical component of active pressure in retaining walls
I'm not sure when the Coulomb formulation is justified and when it isn't. Maybe that is the reason for the option in Enercalc.
Any thoughts welcome.
RE: Vertical component of active pressure in retaining walls
RE: Vertical component of active pressure in retaining walls
Thanks---Peter
RE: Vertical component of active pressure in retaining walls
Coulomb could be used where there was no cantilever, or where the cantilever was on the exposed side of the wall. In this case, the soil forces would be acting against the wall and friction would be applicible.
You do get a component of vertical force from Rankine where there is sloping backfill.
RE: Vertical component of active pressure in retaining walls
Cudoto's Foundation Design text (2001) page 797 states that the active component of vertical pressure is used to resist OTM in cantilevered retaining walls. The development active pressure assumes a slight outward wall movement so the soil wedge falls slightly while clinging to wall with friction. The only requirements are for outward movement of the wall and a rough wall surface. I don't know if clay backfill would also develop long term friction force.
RE: Vertical component of active pressure in retaining walls