Angle of Friction
From Geotechdata.info |
Updated April 29, 2011 |
| The friction angle is a shear strength parameter of soils. Its
definition is derived from the Mohr-Coulomb failure criterion and it is used
to describe the friction shear resistance of soils together with the normal
effective stress. In the stress plane of Shear stress-effective normal
stress, the soil friction angle is the angle of inclination with respect to
the horizontal axis of the Mohr-Coulomb shear resistance line. |
| Typical values for
Angle of Friction; Provided by Geotechdata.info |
| USCS |
Description |
Average value
(Degree) |
Value from literature
[Ref]
(Degree) |
| GW |
Well
graded gravel, sandy gravel, with little or no fines |
40
± 5 |
40 ± 5 [1]; 30-35 [2]; |
| GP |
Poorly
graded gravel, sandy gravel, with little or no fines |
38
± 6 |
38 ± 6 [1]; |
| GM |
Silty
gravels, silty sandy gravels |
36
± 4 |
36 ± 4 [1]; |
| GC |
Clayey
gravels, clayey sandy gravels |
34
± 4 |
34 ± 4 [1]; |
| SW |
Well
graded sands, gravelly sands, with little or no fines |
38
± 5 |
38 ± 5 [1]; |
| SP |
Poorly
graded sands, gravelly sands, with little or no fines |
34
± 4 |
36 ± 6 [1]; 30-35 [2]; |
| SM |
Silty
sands |
34
± 3 |
34 ± 3 [1]; |
| SC |
Clayey
sands |
32
± 4 |
32 ± 4 [1]; |
| ML |
Inorganic
silts, silty or clayey fine sands, with slight plasticity |
33
± 4 |
33 ± 4 [1]; |
| CL |
Inorganic
clays, silty clays, sandy clays of low plasticity |
27
± 4 |
27 ± 4 [1]; |
| OL |
Organic
silts and organic silty clays of low plasticity |
25
± 4 |
25 ± 4 [1]; |
| MH |
Inorganic
silts of high plasticity |
24
± 6 |
24 ± 6 [1]; |
| CH |
Inorganic
clays of high plasticity |
22
± 4 |
22 ± 4 [1]; |
| OH |
Organic
clays of high plasticity |
22
± 4 |
22 ± 4 [1]; |
| Pt |
Peat
and other highly organic soils |
5
± 5 |
0-10 [2]; |
Citation :
Geotechdata.info, Angle of Friction,
http://geotechdata.info/parameter/angle-of-friction (as of April 29, 2011). |
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