Return Wall or Full Braced Wall...should the wall be designed for active or static pressure
Return Wall or Full Braced Wall...should the wall be designed for active or static pressure
(OP)
Hi,
I have a return wall in a retaining wall, the wall is steel soldier pile (single brace in strong axis) with timber lagging. If the soldier pile is fully braced by the lagging for the full height of the excavation, I assume the correct soil load diagram is 0.65*gamma*H*Ka or is it 0.65*gamma*H*ko? Something else?
Thoughts?
Thanks,
Ben
I have a return wall in a retaining wall, the wall is steel soldier pile (single brace in strong axis) with timber lagging. If the soldier pile is fully braced by the lagging for the full height of the excavation, I assume the correct soil load diagram is 0.65*gamma*H*Ka or is it 0.65*gamma*H*ko? Something else?
Thoughts?
Thanks,
Ben





RE: Return Wall or Full Braced Wall...should the wall be designed for active or static pressure
RE: Return Wall or Full Braced Wall...should the wall be designed for active or static pressure
DaveAtkins
RE: Return Wall or Full Braced Wall...should the wall be designed for active or static pressure
It is with regards to the weak axis. In the weak axis, the lagging shown on the top of the attached screen shot presses on the weak axis of the pile. The lagging on the opposite side of the pile resists this force as well as some soil pressure against the pile.
My questions has a couple of parts, but to make it simple, if the lagging supporting the pile in the weak axis runs the full height of the pile...the pressure distribution assumed to act on the pile should be rectangular in the weak axis? and if so, static or active? The lagging will be installed "on the way down". The 2nd portion to this question, can passive pressure be used to reduce the load on the lagging resisting this force? if not, how about static pressure? I think the answer is no. What are your thoughts?
RE: Return Wall or Full Braced Wall...should the wall be designed for active or static pressure
RE: Return Wall or Full Braced Wall...should the wall be designed for active or static pressure
The actual corner of the braced excavation is further restrained, which I think is the point of the OP. I'm not accustom to seeing the earth pressure at these, "Returns" modified as you may expect for at-rest conditions.
We do require slope inclinometers and survey monitors to quantify vertical and horizontal movements as the excavation progresses.
f-d
ípapß gordo ainÆt no madre flaca!
RE: Return Wall or Full Braced Wall...should the wall be designed for active or static pressure
RE: Return Wall or Full Braced Wall...should the wall be designed for active or static pressure
In summary, worry about the first principals and look into all details.
f-d
ípapß gordo ainÆt no madre flaca!