spt.phi_from_n160()

Friction angle from the corrected SPT blow count.

Usage

Source

spt.phi_from_n160(
    n160,
    cap=45.0,
)

Parameters

n160: array_like

Overburden- and energy-corrected blow count N1,60.

cap: float = 45.0

Upper limit on the friction angle, deg.

Returns

ndarray

min(cap, 26 + 5.5 log10(N1,60 + 0.01) + 0.11 N1,60), deg.

References

WSDOT Geotechnical Design Manual (2022), Table 5-1 band midpoints.