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RE: soils pressure

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Thanks, Paul.

I was hoping someone would say out loud what I was thinking.

T. William (Bill) Allen, S.E. (CA #2607)
ALLEN DESIGNS (http://www.AllenDesigns.com)
San Juan Capistrano, CA

:-----Original Message-----
:From: Paul Feather [mailto:pfeather(--nospam--at)SE-Solutions.net]
:Sent: Thursday, April 22, 2004 10:08 AM
:To: seaint(--nospam--at)seaint.org
:Subject: Re: soils pressure
:
:Joe,
:
:I would not design a 12 foot retaining wall without a soils report. I do
:not
:see how you can assume anything less than full soil pressure occurring at
:some point in the life of the structure.  Anything less is opening yourself
:up to all kinds of potential problems and liability.  Soil moves and shifts
:with time and changes in moisture content, the cut will not stand
:indefinitely.  Also, who is liable when the near vertical cut does not hold
:and kills one of the construction workers?
:
:
:Paul Feather PE, SE
:pfeather(--nospam--at)SE-Solutions.net
:www.SE-Solutions.net
:----- Original Message -----
:From: "Joe Grill" <jgrill(--nospam--at)swiaz.com>
:To: <seaint(--nospam--at)seaint.org>
:Sent: Wednesday, April 21, 2004 3:00 PM
:Subject: soils pressure
:
:
:> I have been asked to design a basement wall with a 12' retained height of
:> soil.  There has been no geotechnical review of the residence, but the
:> architect, who has done other work in the area, tells me the cut will
:> probably stand almost vertical.  If this near vertical face is just a
:couple
:> of feet away from the wall and the backfill is a free draining fill, will
:> the fill be able to achieve full lateral soil pressure against the wall.
:> The architect/contractor/owner wants to use the floor diaphragm to
:restrain
:> the top of the wall.  If the full lateral soil pressure is achieved then
:the
:> diaphragm doesn't have the capacity to restrain the wall.  I have
:suggested
:> a geotech be brought in to look at the excavation and make
:recommendations
:> at that point, but of course that hasn't been received very well.  If the
:> full soil pressure is not activated will there be any pressure at all and
:> how is it calculated.
:>
:> Any ideas?
:>
:> Joseph R. Grill
:>
:>
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