geotech (version 1.0.2)

grainSize.coefs: Coefficients of Uniformity and Curvature (Grain-Size Distributions)

Description

Calculates the coefficients of uniformity and curvature. 1 December 2015

Usage

grainSize.coefs(percent, sieve = NA, size = NA, D10 = NA, D30 = NA, D60 = NA)

Value

A two-element list containing: Cu = Coefficient of uniformity (D60 / D10) and Cc = Coefficient of curvature (D30^2 / (D10 * D60))

Arguments

percent

= vector of percent passing

sieve

= vector of sieve numbers according to ASTM D422

size

= vector of grain sizes

D10

= D-sizes corresponding to 10 percent

D30

= D-sizes corresponding to 30 percent

D60

= D-sizes corresponding to 60 percent

Author

Kyle Elmy and Jim Kaklamanos

Examples

# Example 1

sieve.example <- c(3/8, 4, 10, 20, 40, 140, 200)
percent.example <- c(95.72, 90.23, 81.49, 66.36, 50.00, 8.51, 4.82) 
grainSize.coefs(sieve = sieve.example, percent = percent.example)


# Example 2

grainSize.coefs(D60 = 0.10, D30 = 0.03, D10 = 0.002)