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Foundation Underpinning[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: Foundation Underpinning
- From: "Drew A. Norman, S.E." <dnormanse(--nospam--at)email.msn.com>
- Date: Wed, 3 Dec 1997 09:55:33 -0800
Underpinning thread (responses to Kate O'Brien's inquiry) is fascinating. I notice no one has mentioned soil amendment. Just a thought, but if Kate really does have a significant increase in soil pressure there are relatively inexpensive techniques involving grout injection which can locally improve bearing capacity of weak soils. The costs and risks of underpinning (including Bill Allen's comments about loss of confinement/compaction, which is quite thought provoking, as well as the danger of settlement during implementation) are not insignificant. I think we (structural designers) sometimes forget to think about (or are reluctant to pursue) solutions to structural problems that are in part "non-structural" and therefore require us to coordinate with other members of the design team. The soils engineer coming up with an amendment scheme and overseeing its implementation would probably command a bigger fee than Kate got for her whole structural design, but it seems to me at least possible that this might be the most cost effective way of protecting the owner's investment. Interestedly, Drew A. Norman, S.E.
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