Honestly, I didn’t think tipping was a problem. But undermining would be, though I thought the quick-fix rifraf and concrete would hold for a while.
Apparently, they saw differently (and that’s one reason I’m not in charge of this type of operation).
From the looks of the drawing, they’d have to dig up some of what they just laid down.
I imagine they’ll just lay it atop the rock/slurry work. I want to see how they start out with the RCC to fill in the rough spots. Might be tough maneuvering the vibrating rollers until they get some smooth places to work with.
Back when I was doing some paving of yards for sawmill log storage back in the 80s, RCC was a new thing. First place I ever saw anything about it was at the 1984 New Orleans Worlds Fair. Someone had a booth with literature.
I can see how it could be very economical in some applications. No forms, no reinforcing. Lots of concrete in a short period of time.