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Re: Vertical Shafts

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Try the following:

Design as a compression ring, with 15% - 50% differential loading between orthogonal loads (100 EW, say 80%NS) to trigger accidental moment, or tension/compression struts in your case.
For the variable lateral load per depth, see
(1.) Your friendly geotechnical engineer.
(2.) NAVFAC /w input from geotech eng.

Finally, check out Net for prefab systems.  One I've seen, but have never used, is American Commertial Inc.  ( ).

Let me know what you end up doing.  I would be very interested.

edward arrington

>>> Stanley_P_Johnson(--nospam--at) 12/08/00 10:34AM >>>
I have been asked to participate in a team working on a system for
dewatering a hillside.  The dewatering system will include a fairly large
(perhaps 20 foot dia and a few hundred feet deep) vertical shaft.  The
structural system for the shaft is to be circular lattice girders plus
shotcrete.  I am looking for reference books and design guidelines for this
type of structural system.

Stan Johnson, PE
Of course, if there is no electricity to run the pumps then we're sunk  : )