Is there a relationship between the angle of internal friction and the sliding friction factor? Otherwise, how do you calculate the sliding friction factor?
There are relationships depending on whether it's cast-in-place concrete, pre-cast concrete, steel plating, etc. The form of the relationship is essentially a percentage of the friction angle. So if 2/3 phi is 20 degrees the friction factor would be 0.36.
Sorry, I should have stated it's for cast-in-place. Is there a reference you can recommend where the relationship is explained? I can't find this in my old soils textbook.
got a table in my office out of a text book but don't recall what it is off the top of my head. i remember seeing it somewhere else electronic too but my memory is failing these days. i'll look around my computer.
for cast in place and good soil 0.35-0.4 is reasonable
Per Lindeburg's 3rd Edition Civil Engineering Review Manual, Page 10-23: Condition/Friction Angle
1. Concrete or masonry on clean, sound rock/35 degrees
2. Concrete or masonry on clean gravel, gravel-sand mixtures, and coarse sand/29-31 degrees
3. Concrete or masonry on clean fine to medium sand, silty medium to coarse sand, and silty or clayey gravel/24-29 degrees
4. Concrete or masonry on clean fine sand, and silty or clayey fine to medium sand/19-24 degrees
5. Concrete or masonry on fine sandy silt, and non-plastic silt/17-19 degrees
6. Concrete or masonry on very stiff clay, and hard residual or preconsolidated clay/22-26 degrees
7. Concrete or masonry on medium stiff clay, stiff clay, and silty clay/17-19 degrees
