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Re: History of Retaining Wall Sliding

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Jonathon Mallard

I was told of a 40' high retaining wall which was part 
of a drydock which moved.  The person was a local 
geotechnical engineer who investigated it.  I can give 
you his name and phone number if you wish.

Gary

On 7 Apr 2003 at 21:08, Steve Privett wrote:

> I don't know the 1930s, but as late as 1978, Amrhein showed resistance
> to sliding only having to exceed the horizontal force. The 82 UBC
> stated that retaining walls were to be designed per "accepted
> engineering practices."  The 85 UBC added the requirement that they
> "shall be designed to resist sliding and overturning by at least 1.5
> times the lateral force ...." Steve P. Pasadena CA
> 
> On 4/3/2003 2:09 PM after considerable forethought, Jonathan Mallard
> wrote:
> 
> >Back to my bridge built in 1930....
> >
> >On one of the approaches, there is a retaining wall adjacent to a
> >cemetery. Rough dimensions are 13'-4" tall, 6'-0" wide at the base
> >and 2'-3" at the top.
> >
> >We're thinking about cutting the wall slightly below the top, adding
> >a moment slab, and raising the grade about 7.5 feet.  At this point,
> >sliding becomes quite a problem!  We then went back and analyzed the
> >existing wall using the plans we have, and calculated a factor of
> >safety against for sliding of 1.08 - a good deal less then 1.5.  
> >
> >Looking at pictures of the existing wall in place, it doesn't appear
> >to have moved much in 70 + years.  Does anyone know if they even
> >checked for sliding back then?  
> >
> >And other than taking out the existing and starting over, does anyone
> >have any stories about similar additions to older retaining walls
> >that they can share?
> >
> >Thanks!
> >
> >Jonathan Mallard, P.E.
> >Design Engineer
> >Ralph Whitehead Associates
> >(804) 794-1185 
> >(804) 378-0923 FAX
> >jonathan.mallard(--nospam--at)rwhitehead.com
> >www.rwhitehead.com
> >
> 
> 
> 
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