Coulomb Failure Plane Angle

Question

Coulomb Failure Plane Angle

RFreund (Structural)

(OP)

30 Aug 12 11:45

Does anyone have a reference showing the equation for this angle? The only reference I have is NCMA Segmental Retaining Wall Design Manual. But I would like to see this derived in a different text.

EIT
www.HowToEngineer.com

RFreund (Structural) · Answer 1 · 2012-08-30 12:08:21

Forgot to add the equation includes:
-Backslope, wall batter and wall friction.

EIT
www.HowToEngineer.com

FixedEarth (Geotechnical) · Answer 2 · 2012-08-31 02:45:50

It is on pages 4-14 through 4-17 of the 2011 Caltrans Trenching & Shoring Manual. Careful with the wall friction angle value.

RFreund (Structural) · Answer 3 · 2012-09-04 14:13:45

RE: Coulomb Failure Plane Angle

RFreund (Structural)

(OP)

4 Sep 12 14:13

Thanks!

EIT
www.HowToEngineer.com

RFreund (Structural) · Answer 4 · 2012-09-17 22:10:44

So I finally got around to checking this out and I realized they don't include a coulomb failure plane or a failure plane equation that includes wall friction. Not a huge deal, but I just can't seem to find this equation anywhere.

EIT
www.HowToEngineer.com

fattdad (Geotechnical) · Answer 5 · 2012-10-02 14:11:22

I think the reason there's no stancdard equation for all cases of soil strength is because Coulomb is a trial and error method. At least that's what I recall from grad school oh so many years ago. . .

f-d

¡papá gordo ain’t no madre flaca!

dgillette (Geotechnical) · Answer 6 · 2012-10-16 13:28:35

fattdad - I think I remember setting it up with the force on the wall as a fn. of the base angle, taking the first derivative w.r.t. the angle, setting that to zero, and solving for the angle that gives the highest active pressure. As you know, however, that was a few years back.

Cheers!
DRG

Come Join Us!

Posting Guidelines

Related Projects

Jobs

Coulomb Failure Plane Angle