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RE: Strengthening soils under existing footing?

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Thanks for the contact.  There are few options since the column(s) are near the center of a single story office/township building.  Piles are out of the question - at least at this point in time.  Injection probably won't be desirable either, but at least I'll know my limititations.
Jim W.

"Stuart, Matthew" <mstuart(--nospam--at)> wrote:

Grout injection can be expense. Contact Otto DeJager at Infrastructure Repair Service  973-692-0002


D. Matthew Stuart, P.E., S.E.


Senior Project Manager

Schoor DePalma Engineers and Consultants

200 State Highway Nine

Manalapan, NJ 07726

732-577-9000 (Ext. 1283)

732-431-9428 (Fax)

908-309-8657 (Cell)



-----Original Message-----
From: Jim Wilson [mailto:wilsonengineers(--nospam--at)]
Sent: Thursday, July 29, 2004 2:31 PM
To: seaint(--nospam--at)
Subject: Strengthening soils under existing footing?


Has anyone considered a way to strengthen the soils under an existing footing without disturbing much of the surrounding?  I am envisioning pressure grouting through a 30" x 30" footing to the soil below to effectively increase the bearing area.  Hmm...


The original design drawings ca. 1975 state a 4000psf soil capacity.  The owner wants to add a penthouse/roof structure, but the soil bearing pressure is limiting the ability to do so.  Its hardly practical to widen the footings and add new columns centered on the new improved/footing.


Is grouting effective in this case, and is it even cost effective?  Any thoughts?


Thanks in advance,


Jim Wilson, PE


Stroudsburg, PA

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