Bearing capacity near vertical cut

Question

Bearing capacity near vertical cut

pelelo (Geotechnical)

(OP)

23 Aug 23 14:33

Engineers,

I know that NAVFAC (DM 7.2) provides guidance of how to estimate the bearing capacity of footings on slopes or near slopes. I noticed the steepest slope they consider is B = 40 degrees.

I was wondering if there is any other reference which estimates the bearing capacity of soils near vertical cuts?. I understand that slope stability plays a roll in this analysis however, I would like to estimate the bearing capacity considering that condition as you may know it should be less than bearing capacity on level ground.

Thanks.

geotechguy1 (Civil/Environmental) · Answer 1 · 2023-08-24 03:56:34

Unless you can find a journal article where someone has done a correlation or something for this case I think it's a plaxis / FE problem

EireChch (Geotechnical) · Answer 2 · 2023-08-24 07:45:56

Das' foundation book discusses your exact situation in detail

pelelo (Geotechnical) · Answer 3 · 2023-08-25 16:05:33

Thanks,

EireChch,

I think you are referring to the NAVFAC - DM 7.2 approach that Das includes in his book.

That approach is for slope as steep as 40 degrees. The question is, how to compute the bearing capacity when structures are close to vertical cuts or fills.

Thanks.

BigH (Geotechnical) · Answer 4 · 2023-08-28 16:26:50

why not look at it as a slope stability problem?

GeoEnvGuy (Geotechnical) · Answer 5 · 2023-09-07 20:51:38

From my previous experience you put a crane next to a slope will it have enough bearing capacity or do we need to build out a crane pad or use a bigger crane farther away, the answer was see stability analysis with maximum load applied by the crane footing or distributed by a cribbing pad.

The bearing capacity formulas are based on the assumed failure plane which if you put next to a slope are reduced you are then left to either modify the formula to account for the reduced resistance of put it through a slope stability program which you can replicate the failure plane on flat ground then modify the slope from there.

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Bearing capacity near vertical cut