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Estimate of Angle of Internal Friction



The angle of internal friction can be estimated from a sands relative density and it's gradation. Relative density is a measure of how dense a sand is compared with its maximum density.

Relative Density	Grain Type	Gradation	Angle of Internal Friction
40	Fine Grained	Uniform	34
40	Fine Grained	Well Graded	36
40	Medium Grained	Uniform	36
40	Medium Grained	Well Graded	38
40	Coarse Grained	Uniform	38
40	Coarse Grained	Uniform	41
60	Fine Grained	Uniform	36
60	Fine Grained	Well Graded	38
60	Medium Grained	Uniform	38
60	Medium Grained	Well Graded	41
60	Coarse Grained	Uniform	41
60	Coarse Grained	Uniform	43
80	Fine Grained	Uniform	39
80	Fine Grained	Well Graded	41
80	Medium Grained	Uniform	41
80	Medium Grained	Well Graded	43
80	Coarse Grained	Uniform	44
80	Coarse Grained	Uniform	44
100	Fine Grained	Uniform	42
100	Fine Grained	Well Graded	43
100	Medium Grained	Uniform	43
100	Medium Grained	Well Graded	44
100	Coarse Grained	Uniform	44
100	Coarse Grained	Uniform	46

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