This is a master function that calculates a soil's classification according
to the Unified Soil Classification System (USCS). The functions A.line,
USCS.coarse.symbol, and USCS.fine.symbol are called by this function. 1
December 2015
Usage
USCS(
pg = NA,
ps = NA,
pf = NA,
Cc = NA,
Cu = NA,
LL = NA,
PL = NA,
PI = NA,
sieve = NA,
size = NA,
percent = NA,
metric = NA
)
Value
A two-element list providing a soil's USCS group symbol and name
symbol = USCS group symbol and name = USCS group name
Arguments
pg
= percent gravel (%)
ps
= percent sand (%)
pf
= percent fines (%)
Cc
= coefficient of curvature
Cu
= coefficient of uniformity
LL
= liquid limit
PL
= plastic limit
PI
= plasticity index
sieve
= vector of sieve numbers according to ASTM D422 for grain-size
distribution
size
= vector of grain sizes (in or mm) in distribution
percent
= vector of percent passing (grain-size distribution)
metric
= logical variable: TRUE for metric units (mm), FALSE for
English units (in) [only needed if grain sizes are provided]