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RE: Residential Foundation Tipping

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I would agree.
 
My question would be is there signs of continuous movement or has it been this way for some time?
 
It is possible that the at rest pressure overwhelmed the connection to the top of the wall, but it stopped as the at rest pressures "retreated" active pressure levels when the wall moved.  It could still fail as the soils reconsolidates overtime and goes back to an at rest pressure level and pushes it further.
 
Things like drainage (proper draining soil against the wall down to decent drain tile) and water table level and general soil moisture level at the wall due to rain can also have a dramatic effect.  Also is there a possible surcharge load (i.e. can something heavy be places on the ground near the wall such as a heavy vehicle).
 
Regards,
 
Scott
Adrain, MI
-----Original Message-----
From: Steve Gordin [mailto:sgordin(--nospam--at)sgeconsulting.com]
Sent: Friday, June 20, 2008 2:54 PM
To: Seaint
Subject: Re: Residential Foundation Tipping

Terek,
 
As bad as it looks, it still may work, provided the slab is present.  There is somehting else here, too.
The inward rotation of the wall points more to the floor at its top giving way than to the inadequacy of the foundation.
 
V. Steve Gordin, SE
Irvine CA
----- Original Message -----
Sent: Friday, June 20, 2008 11:41
Subject: Re: Residential Foundation Tipping

Dave,

I do not think an 8" x 16" "footer" works for a 9' tall retaining wall

Tarek Mokhtar, SE
Laguna Beach



I *assumed* it's a basement wall.

Ralph

In a message dated 6/20/08 11:01:53 AM, mblangy(--nospam--at)satco-inc.com writes:

I love these kinds of things. I used to work for an veteran engineer who got these calls from colleagues a lot.
 
So there is no lateral earth pressure on either side of the wall, correct? Is there a SOG present on either side?
 
Michel
-----Original Message-----
From: David Maynard [mailto:d_maynard(--nospam--at)wester-wetstein.com]
Sent: Friday, June 20, 2008 10:38 AM
To: seaint(--nospam--at)seaint.org
Subject: Residential Foundation Tipping


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



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