overdig under wall

[stephs888]

Hi, tldr; i screwed up.

We dug the shelf that supports the wall frame for my in-ground pool too deep at one end of the pool. Shallow end is correct, but tapers down by 4 1/2" at the deep end. I was thinking i'd build it back up to the correct elevation using crushed stone and a layer of concrete (there's some undercut below the wall i have to deal with). Question is, can i just level the low end, or should i dig down the correct end as well to get a consistent substrate all the way around the pool. Not sure if ground settlement under the wall is a risk - i.e., it's not like a normal foundation that has to bear high load.
thanks,
steph

 

[AQUA~HOLICS]

How much crushed rock and concrete is needed to bring back to the correct elevation?

 

[stephs888]

How much crushed rock and concrete is needed to bring back to the correct elevation?

the grade starts to slope down from 0 to -4.5" over a 2' wide run of about 20 ft. my guess is a few yds of stone and half yd of concrete. i think i'll just assemble the frame and shim it up with pavers, dump crushed stone (compacted) behind the wall to support the braces, plug any gaps under the wall with temporary forms, and then pour the concrete collar.

 

[AQUA~HOLICS]

Compaction is the key when over excavation has occurred. Depending on the lift, it needs to be done in layers not just one large section. Using a mechanical tamper may help in obtaining the proper compaction.