RE: Expansive Soil[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Expansive Soil
- From: Robert Rollo <rrollo(--nospam--at)TEAM-PSC.com>
- Date: Thu, 26 Apr 2001 12:58:30 -0500
roger et al:
i agree 105%.
just looking for "the norm".
is it their all out refusal or is it our ineffective communication in not asking for that specific piece of info in our request for services ?
or does the architect order geotech without asking his structural first ?
r o b e r t d. r o l l o
Parkhill, Smith & Cooper, Inc.
4222 85th st
Lubbock, Texas 79423
(806) 473-2200 vox
(806) 473-3500 fax
From: Roger Turk [SMTP:73527.1356(--nospam--at)compuserve.com]
Sent: Thursday, April 26, 2001 12:26 PM
Subject: RE: Expansive Soil
Eric Green wrote:
. > Depends on the specifics of the soil. In general, in our local highly
. > expansive soils (Texas gulf coast), a two story building does not have
. > enough weight to stop expansion. OTOH, if you building is very heavy, it
. > might.
This reinforces a point that I have been trying to make for some time now.
The geotechs do not give us the confinement pressure, i.e., the pressure that
is necessary to prevent the soil from expanding. Once geotechs start giving
us confinement pressure, I think that we will find that non-plastic soil,
e.g., clayey sand, that has expansive clay particles will also expand and
will exert about the same pressure as a highly plastic soil containing the
same expansive clay.
The nebulous expansion index and "potential for expansion" quantification
does not give us, as structural engineers, any information on which we can
base our structural design.
It is my understanding that confinement pressure can easily run several tons
per square foot. While the weight of a building may exert similar pressures
on the footings, not too many floor slabs are designed to resist these force
A. Roger Turk, P.E.(Structural)
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