Ok - so I think I've done something a little stupid - involving a slight slope and 66 bags of concrete...

Last week I cleared an area out next to a fence that has a slight slope on it (about 1' within 2-3' distance). I cut the ground down equal to the neighbor's fence line, and then put in a retaining wall consisting of treated 2x12s, staked in with 18" steel stakes.

Then, I poured a long slab (actually three 8' sections with expansion joints between them) with the intention of building a firewood shelter on it. The slab is considerable - too large, actually - at about 24' feet long, 2' wide, and about 7" thick...66 50# bags worth - with 1/2" rebar inside...

The next day, I noticed that one part of the retaining wall has moved about 1/2" or so - so I staked it with 48" long, 1/2 thick rebar at several points to arrest the movement.

I'm now trying to determine the best path to stabilize the hillside and arrest further movement of this slab, or the retaining wall beneath it... I've been considering driving some rebar in at an angle against the slab, or even tunneling beneath it in places to pour smaller bench footings...but I'm not sure...

I'm hoping that the existing movement has been initial settling - and it will stop where it is...the slab is sitting on about 2/3 to 3/4 stable ground...so perhaps I'll get lucky and this (movement) will be it...

Any ideas? I have images I can email anyone who wants to see this...

Thanks...

 

Post the pictures.

 

I don't see any way to attach images to this post - the attachment option usually found in vBulletin is not there...am I missing something?

 

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Thanks for the help!

 

Hi there

You should have never poured a 7" thick slab on disturbed soil. The wall is insufficient to hold back all that weight. If it keeps moving and it probably will its going to knock the fence down. I do not see a cheap fix or an expensive one on this at all.
I would remove it and build racks. The firewood should be off the ground anyway.

Frank

 

Without a site survey there is a possible fix...


Sink 3' deep holes using an uger or a jack hammer with a clay spade. Set 18" sonitube formms w 4 vertical 5/8" rebar wire-tied to horizontal rebar Every 10". Set these form every 8'. Where the four rebar are above grade, wire tie 2 5/8" rebar, with horizontal wire tied rebar every 3'. Lay wire mesh atop. Tamp the spil down with a pnumatic tamper. Build a 1 wide form about 6" high. Add pea gravel and sand and tamp again. Pour with expansion joints every 8'. This will hold your loose slab. However from slifing. However, if the first footing was pored wrong, it make settle and crack/ crumble. The second footing is for real.