Determine the USCS symbol for coarse-grained soils

Classifies gravel and sand soils according to the Unified Soil Classification System (USCS / ASTM D2487) from gradation characteristics and, when fines exceed 5 percent, Atterberg limits.

Usage

USCS.coarse.symbol(pg, ps, pf, Cc, Cu, LL, PL, PI = NA)

Arguments

pg

Numeric. Percent gravel (retained on the No. 4 / 4.75 mm sieve).

ps

Numeric. Percent sand.

pf

Numeric. Percent fines (passing No. 200 / 0.075 mm sieve).

Cc

Numeric. Curvature coefficient.

Cu

Numeric. Uniformity coefficient.

LL

Numeric. Liquid limit (percent). Required when pf is between 5 and 12, or greater than 12.

PL

Numeric. Plastic limit (percent). Used together with LL to derive PI.

PI

Numeric. Plasticity index (percent). Default NA; computed from LL and PL if not provided.

Value

A character string with the USCS group symbol (e.g. "GW", "SP-SM").

Details

This function is taken from the "geotech" package from James Kaklamanos

See also

Other soil mechanics, classification: Dsize(), USCS(), USCS.fine.symbol(), grainSize.coefs(), percentComponents(), size.from.sieve()

Examples

USCS.coarse.symbol(pg = 60, ps = 35, pf = 5, Cc = 1.5, Cu = 5,
                   LL = 0, PL = 0, PI = 0)
#> [1] "GW-GC"