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Typical Interface Friction Angles

Articles > Typical Interface Friction Angles
  Interface Meterials Interface Friction Angle (degree)
Mass concrete against: clean sound rock 25
clean gravel, gravel-sand mixtures 29-31
clean fine to medium sand, silty medium to coarse sand, silty or clayey gravel 24-29
clean fine sand, silty or clayey fine to medium sand 19-24
fine sandy silt, nonplastic silt 17-19
Formed concrete against: medium-stiff and stiff clay and silty clay 17-19
clean gravel, gravel-sand mixtures, well-graded rock fill with spalls 22-26
clean sand, silty sand-gravel mixture, single-size hard rock fill 17-22
Steel sheet pile againsts silty sand, gravel, or sand mixed with silt or clay fine sandy silt, nonplastic silt 17
clean gravel, gravel-sand mixture, well graded rock fill (with spalls) 14 (22)
clean sand, silty sand-gravel mixture, single-size hard rock fill 17
silty sand, gravel, or sand mixed with silt or clay fine sandy silt, nonplastic silt 11

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