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RE: friction coefficient on rock

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Thanks guys,

Actually, I just ran across an old AASHTO manual in the office (I don’t do bridges) and it has a table showing .7 for the friction factor.  The geotech told to contractor to use some pins into the rock, so I’ll probably give them some of those also.

Thanks again,

Joe Grill


-----Original Message-----
From: Keith De Lapp [mailto:keith(--nospam--at)]
Sent: Thursday, October 28, 2004 9:58 AM
To: seaint(--nospam--at)
Subject: RE: friction coefficient on rock


DM-7 say 0.7 for mass concrete on clean sound rock.


Keith De Lapp, P.E.


-----Original Message-----
From: Joe Grill [mailto:jgrill(--nospam--at)]
Sent: Thursday, October 28, 2004 9:30 AM
To: seaint(--nospam--at)
Subject: friction coefficient on rock

After excavation it is found that a retaining wall will be founded on solid rock (sandstone). Can anyone give me a friction coefficient for this condition if any?  I don’t have a reference that addresses this situation.


Joe Grill


Joseph R. Grill, P.E.