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Re: Active Pressure Coefficient of...

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That was my thought as well, although the graphic image of gas bubble percolating though such a mass is not exactly a welcome thought at lunch time ;-)

I can say, from experience, that the coefficient of friction of wet chicken manure is perilously close to 0.  In fact, I'd be tempted to say that said manure, deposited in a thin, approximately uniform layer on a subtrate of M & C soil, sufficiently dampened by a prolonged drizzle, may indeed have a negative mu_s.  But that was a long time ago.
Jordan


bcainse(--nospam--at)aol.com wrote:
Bill-
Although I'm sure the material in question is quite "active", due to the "activity" involved in the composting process, the at rest pressures or fluid pressures similar to the unit weight of the material would probably be more nearly what you would see on an unrestrained wall.  Picture gas bubbles causing expansion and readjustment of the material as they form and dissipate.
Regards, 
Bill Cain, S.E.
Berkeley CA
 
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