i have a foundation that was poured on uncompacted fill in one corner about 20 each direction. my best idea is dig out and under footer and either fill and compact, or form up and pour concrete down to virgin ground. either way i will have to pour some concrete, anyone have an easy way of accomplishing this
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One of the prime directives says, "No organic matter in the backfill." Otherwise, I'd suggest packing the contractor who did this into the void under the foundation. Too bad....
I've no real experience in the fix needed. Perhaps a concrete slurry could be pumped under the footer rather than digging. Because digging means subgrade disturbance which means compaction. All really difficult with a foundation already overhead.
Yeah, I would look at having some sort of grout pumped under the foundation. In some parts of the country you'd get a "mud jacker" to do this.
How far along?
If it were just the footers, I'd consider tearing them out over the un-compacted area, fixing the compaction, and pouring new footers with a rebar joint. If more than the footers, I'd think about mud jacking or adding helical piers. And I'd be talking to an engineer.
I did a job one time where footings needed to be under pinned. We excavated 5' segments with 5' unexcavated between. We then poured concrete into the excavations. After it set for a while we came back and excavated the other sections and poured them. It involved some rebar dowels to tie it all together.