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Ventilation shaft and Head House

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I am working on a preliminary design of the above metioned and am asking if anyone knows of a good reference for a 22 foot inside diameter vetilation shaft drilled 200 feet into the ground in a Zone 3 region.  I mostly interested in force distribution from soil pressures amd seismic loads.

Thank you in advance

David A. Hall, S.E., P.E.
Senior Structural Engineer
David Evans and Associates, Inc.
2828 SW Corbett Ave
Portland, OR 97201
Fax 503-223-2701
E-Mail dahl(--nospam--at)