It is currently 29 Mar 2024, 06:17
Doug wrote:I have known a similar thing where rats from the sewer had built warrens extending out from the drainpipe, the water from the pipe had over time flowed into these warrens causing erosion & eventually the land around the sewer collapsed.
It could also be as simple as leaking drains, over time this will also cause the land to settle.
Mike G wrote:Don't do the prop, Bob. As it rusts it will expand and could break the concrete. If the ground around the hole is stable then just packing some dry-ish concrete under the foundation should be plenty enough.
Rod wrote:Have you had a chance to do anymore digging out?
I’d be very wary of filling with concrete initially if the problem is ground water as you might cause washout elsewhere. Using free draining materials will not trap any water and allow it to continue to flow and escape.
It might be a perched water table as you have clay below or it could be a small swallow hole that’s been bridged in the past.
If you are calling on experts you really need a Geotechnical Soils Lab but that would be very expensive.
I wonder if you can hire hand coring gear??
Rod
Mike G wrote:Don't do the prop, Bob. As it rusts it will expand and could break the concrete. ..
Mike G wrote:Do you have any access to ground above the hole (ie further up the hill?). If you could dig a hole further up the hill and detect the same spring it might be that some diversionary scheme might reveal itself.
RogerS wrote:Mike G wrote:Don't do the prop, Bob. As it rusts it will expand and could break the concrete. ..
You're right, of course, Mike. So why do we put rebar into concrete slabs ?
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