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Using coefficient of friction to back into wall friction angle

thread274-500832

Using coefficient of friction to back into wall friction angle

Using coefficient of friction to back into wall friction angle

(OP)
Using the coefficient of friction, is there any way to back into the wall friction angle? This is for AASHTO

Say COF=0.31, can I arc tan(.31)2/3 to get a wall friction angle of 25.83 degrees?

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RE: Using coefficient of friction to back into wall friction angle

Yes but it all depends on what portion of arc tan you take. 2/3, 3/4 there is a variation in the numbers.

And just report phi to an integer. No decimals

RE: Using coefficient of friction to back into wall friction angle

(OP)
Thanks, I think AASHTO 9th edition limits the Phi angle to 2/3?

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