Uniaxial Compressive Strength (UCS)

Calculates different possible values of UCS based on point load test measurements. It performs several regressions (Gaussian and robust), and also calculates corrected value based on the point load index.

UCS(W, D, P, digits = 2)

Arguments

W	A vector of sample widths, in mm
D	A vector of sample diameters, in mm
P	A vector of loads at failure for each sample, in kN
digits	Number of significant digits to display (Default is 2)

Value

A comparison table and graph

References

ASTM (1995). Standard Test Method for Determination of the Point Load Strength Index of Rock.

Examples

W = c(70.0,95.0,80.0,90.0,98.0,110.0,100.0,100.0,110.0)
D = c(40,55,60,50,25,60,40,70,50)
P = c(4.3,3.4,4.5,3.1,5.0,6.4,2.6,11,4.1)
UCS(W = W, D = D, P = P)
#> $Graph
#> `geom_smooth()` using formula 'y ~ x'
#> `geom_smooth()` using formula 'y ~ x'
#> 
#> $Summary
#>               Method I50 [MPa] UCS [MPa]
#> 1           Gaussian      0.69     15.83
#> 2             Robust      0.82     18.94
#> 3   Corrected (mean)      1.02     23.41
#> 4 Corrected (median)      0.90     20.71
#>