friction coefficient between concrete and soil

or

...for concrete cast on soil.

(See refs)

Both your options are good enough:

...coefficient of friction soil-concrete

(equivalent to my second option)

...or coeficient of soil-concrete friction

(equivalent to my first option)

They mean the same. You can choose the one you like the best.

IHE-Dicea * vertical walls
... the bottom and the soil should be sufficient. A friction coefficient between concrete
and soil of 0.4 - 0.5 is usually taken. When the soil quality is low, the ...
www.ihe.nl/he/dicea/brk80/brk8001.htm - 9k - Cached - Similar pages


Tower Silo Capacities
... The capacity figures in Table 3 were calculated on the basis of a friction coefficient
of 0.6 an appropriate estimate for concrete. High moisture corn is far ...
www.gov.on.ca/OMAFRA/english/livestock/dairy/facts/88-033.h... - 17k - Cached - Similar pages



[PDF] www.usace.army.mil/inet/usace-docs/eng-tech-ltrs/etl1110-3-...
... P where;A = area of thrust block, TB T = thrust force in pipe, f = friction coefficient
for concrete cast on soil; varies with type of soil; refer to Table C-1 ...
Text version

HTH

Good luck.

D.