Slab on slope 2

[WARose]

This is a home/property project.....but I need ideas. I am thinking about pouring a slab on a slope. (See attached pic. Sorry if it looks sloppy to you.) The thing that worries me is: this is likely susceptible to a sliding failure because of the slope. (Needless to say, I haven't called a geotech on this. So I don't know what the coefficient of friction is. The numbers I've come out with put the SF at about "1")

I could live with the sliding down.....but, I really don't want the "undesirable" scenario (shown in the pic) to happen. So my question is: would having one of the edges (3 options shown) possibly insure the slab penetrates the soil at the bottom to prevent the "undesirable" scenario?

Before anyone asks: right now, changing the slope is not a option. Anchoring the slab (into the slope) is something I've considered......but right now, I'd like to focus on: what happens if it does slide down and can I control that? Thanks.

 

[Ron]

In my opinion, JAE is on the right track but agree with mfrad that cracking will result. You only need a thickened edge at the toe of the slope. You can also anchor the top if you want, just be sure to properly joint the concrete in between.

 

[Tomfh]

Agree with the above posts. Adding some teeth makes sense.

 

[cvg]

typical would be to include a turndown at the top and bottom, similar to SRE's standard detail. we do similar for canal lining on a regular basis and may be much steeper than 20 degrees. intermediate keys are difficult to construct and for a 20 degree slope, probably not necessary. You might consider shotcrete for this.