2 retaining walls close to each other
2 retaining walls close to each other
(OP)
I have a situation where there is a basement wall 10ft (3000mm) high. on the interior side of the wall approx 900mm behind it, is another wall to support a fireplace (also 10ft high). The small 900mm space between the two walls will be backfilled. While designing the exterior for retaining is fine, I feel like the interior wall which is technically retaining the 900mm wide portion of backfill doesn't need to be designed for the same pressure as the exterior wall. The soil is confined and in a small space.
Any thoughts on what pressure this interior wall should be designed for? (lateral)
Any thoughts on what pressure this interior wall should be designed for? (lateral)





RE: 2 retaining walls close to each other
RE: 2 retaining walls close to each other
RE: 2 retaining walls close to each other
Water is a different animal altogether. EFP is a 'easy' way to think of it, but it is equivalent not equal.
RE: 2 retaining walls close to each other
RE: 2 retaining walls close to each other
The narrow slot is 35 inches.
Let's use open-graded backfill with a friction angle of 40 degrees and a unit density of 130 pcf.
Ka= tan2(45-phi/2)= 0.22
The angle that enscribes the active wedge is 45-phi/2 as measured from the vertical (i.e., 25 degrees)
At the depth of 75 inches the active wedge hits the opposing wall. Below that depth there will be no greater active soil contriubiton.
Using an equivalent fluid density of 130*0.22, you get 28.6 pcf. So, the active earth pressure would range from 0 at the top to 179 psf at the depth of 75 inches and then stay at 179 for the remainder of the depth.
I'd multiply all these values by 1.5 'cause I'd be using at-rest earth pressures.
f-d
¡papá gordo ain’t no madre flaca!
RE: 2 retaining walls close to each other
RE: 2 retaining walls close to each other
And some more discussion.
http://files.engineering.com/getfile.aspx?folder=d...
I should point out though that all the above info is for flexible wall systems.
EIT
www.HowToEngineer.com