Internal Angle of Friction 2

[tclat]

When designing a retaining wall with a single sized gravel (say 1/2" or 3/4") backfill, what would be the recommended internal angle of friction. Would 36 degrees be reasonable?

Thanks

 

[Ron]

Somewhere between 35 and 40 degrees, depending on particle shape.

 

[msucog]

and don't forget density...(please don't anyone use the phrase "self compacting")

gravel or crushed aggregate? some may read these terms differently even though i'm pretty sure i know what you are referring to.

 

[Mccoy]

A very good source for friction angles and their upper and lower bounds is the following paper from Mike duncan:

http://cee.ucla.edu/news/Duncan_Friction Angles.pdf