>
> Got this call earlier this week. Like to hear what everyone has to say.
>
> It's a residential foundation, 9'-3" wall on top of 8" by 16"
> continuous footer. Reinforcing unknown. The wall is actually tipping
> into the building. Anchor bolts on the outside have broken the
> concrete out at several locations. Soils report says it's a
> sandy-clayey-silt. Took samples from the surface and brought to
> another dirt-engineer who, at sight and touch, believes it to be a
> lean or fat clay. *shrug* Jury is still out on this one. Current
> landscaping is exposed backfill, or NO landscaping at all. There is a
> perimeter sub-drain (one of those perforated pipes surrounded by
> Styrofoam peanuts in a mesh sock) around the base of the foundation.
> House, and wall where damage exists, is about 100 feet away from the
> base of a hill. There appears to be positive drainage away from the house.
>
> I have my own suspicions as to what could have happened, but I am
> curious if anyone has run into this on their end. Anyone? Anyone?
> Foundation damage that I have typically seen is either settlement and
> heave.
>
> Dave Maynard, PE
>
> Gillette, WY
>
It sounds like that the lateral pressure from the exterior backfill has
overloaded the connection at the top of the wall to the floor framing. I
am surprised that the bolts popping out is the weak link.
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