Sliding of footing of retaining/bearing wall 6

[aquacata]

I am designing footings of a retaining/bearing concrete wall. The sliding became an issue because the friction coefficient is low. I wonder if the slab-on-grade adjacent to the wall can be used against the sliding. Thanks for your help!

 

[fattdad]

I'd say the answer is "no". You can lower the base of the wall and take advantage of passive earth pressures. You can also add a shear key, which is about the same thing.

Good luck.

f-d

¡papá gordo ain’t no madre flaca!

 

[csd72]

We have done this before, as long as the slab is at least 4" thick it should be okay to take the axial load.

Make sure that the slab is poured up against the inside of the wall(use a bond breaker).

csd

 

[DaveAtkins]

I agree with csd72. If this is a basement wall, it's done all the time.

DaveAtkins

 

[toones]

Theres no question that a slab can take some of the load. I always like the what if game. What if later on someone removes the slab? Is it permenent with the life of the wall? With that in mind I'm with fattad, if you can't count on on it then lower the base and design for passive soil pressures.

 

[oldestguy]

Question:

Has anyone ever seen a retaining wall foundation slide?

I'm almost 80 and the only failures I have seen are bulging, leaning and tipping over.

Maybe concern about sliding is over emphasized.

 

[miecz]

I agree with toones. You can't be sure that someone in the future won't remove a portion of the slab. Not only that, but if you eliminate the isolation joint between the slab and wall, then differential settlement will crack the slab. In addition to the other suggestions, I've seen the foundation wall extended to each side of the building, creating a lateral shear key, if you will.