I learned in school to "lean" retaining walls back to account for
deflection and I usually use 1/4"/ft. They certainly look much better
when this is done.
Stan Scholl, P.E.
Laguna Beach, CA
On Thu, 24 May 2001 11:44:42 -0500 "Brian K. Smith"
> I think the statement "wall rotation is inherent" should be clarified
> "typically inherent" as it is dependent upon the design method.
> typically design for active soil pressures; however, many times I
> design the
> wall for the Ko or at rest earth pressure, depending on the
> importance of
> the wall. If the wall was designed for the active soil pressures,
> then the
> wall must rotate to produce these pressures. In Foundation Analysis
> Design, 4th Edition by J.E. Bowles, the following is given as to the
> required rotation;
> Cohesionless, dense 0.001 to 0.002H
> Cohesionless, loose 0.002 to 0.004H
> Cohesive, firm 0.01 to 0.02H
> Cohesive, soft 0.02 to 0.05H
> Brian K. Smith, P.E.
> Bossier City, Louisiana
> -----Original Message-----
> From: John P. Riley [mailto:jpriley485(--nospam--at)peoplepc.com]
> Sent: Thursday, May 24, 2001 10:27 AM
> To: Frank E. Stewart; seaint(--nospam--at)seaint.org
> Subject: Retaining wall rotation
> A homeowner made an insurance claim on his retaining walls, one
> each side
> of the front of his underground home. Both walls have rotated since
> construction in 1979, one has an outward lean of about 1/8" in 8"
> (just had
> my little torpedo level with me . . . not real accurate) and the
> other is
> about 1/4" in 8"; both are 12' high tapering to 0' in 12' (i.e.:
> they are 45
> deg triangles).
> I am about to prepare a report, saying among other things that
> wall movement is inherent. But I forget "how much" movement is to
> expected. Of course, I know its impossible to say for all cases,
> but I'm
> looking for an 'order of magnitude' number as a percent of height.
> John P. Riley, PE, SE
> Riley Engineering
> 20 Oakwood Drive, Blue Grass, Iowa 52726
> Tel & Fax: 319-381-3949
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