Effects of Groove Feature on Shear Behavior of Steel-Sand Interface

Table 6

Interface friction angle and fitting formula.

Interface	Interface friction angle (°)	Fitting formula	R^2
Int-A	22.94	τ = 0.4233σ	0.995
Int-B-0°	24.00	τ = 0.4452σ	0.997
Int-B-45°	25.17	τ = 0.4699σ	0.997
Int-B-90°	26.27	τ = 0.4935σ	0.998
Int-C-0°	25.05	τ = 0.4673σ	0.999
Int-C-45°	26.66	τ = 0.5020σ	0.996
Int-C-90°	27.92	τ = 0.5300σ	0.992
Int-D-0°	25.74	τ = 0.4822σ	0.999
Int-D-45°	27.20	τ = 0.5139σ	0.996
Int-D-90°	28.60	τ = 0.5452σ	0.984