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Re: Tie Back Retaining Walls

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Brad Friederichs wrote:
> 
> I'm designing a tieback retaining wall using tierods that are connected
> from back of wall to tiebacks grouted into rock.  The 12 ft wide space
> between the back of vertical retaining wall and the existing slope will be
> backfilled once the tierods are in place.
> 
> The new backfill will be compacted but is being placed on compressible
> materials that are expected to settle about 1" or so during the life of the
> project (50 years).  The wall itself is supported on rock and is not
> expected to settle.
> 
> My question is:  When the fill settles behind the wall, the tierods will
> have vertical load imposed on them from the fill.  One of the tierod
> manufactures states that I don't need to worry about this.  I think that
> the rods will pickup significant tranverse load and possibly fail in
> combined tension and bending or pullout the anchorage due to increased
> axial force (from suspending the soil load above).
> 
> How do you feel about this?
> 
> Brad Friederichs
> VE Solutions, Inc.
> Sacramento, CA
> brad(--nospam--at)ve-solutions.com
> 
Wrap the tie rods w/ foam rubber pipe insulation used by plumbers to
prevent pipe freezing.  Soil will both shear around rods and have
limited downward pressure.  Unless you have designed those tie rods to
develope 99.9% of their strength, shouldn't be a problem at 1 inch
settlement.