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Re: Ventilation shaft and Head House

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At 05:58 PM 19/03/2000 -0800, you wrote:
>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.

"TUNNELS AND SHAFTS IN ROCK", Engineer Manual fron USACE, EM 1110-2-2901 is
a valuable source.

Adolfo Galvez, MSc.
Lima - PERU