Description Usage Arguments Value Author(s) References Examples
These functions are used to calculate corrected blow counts (N-values) for the Standard Penetration Test (SPT). Function N60 calculates corrections for field procedures, and function N160 calculates corrections for field procedures and overburden pressure.
1 2 |
N |
raw SPT N-value |
Lr |
rod length (ft or m) |
E |
hammer efficiency as a decimal (default: 0.60) |
Db |
borehole diameter (in or mm) |
SS |
logical variable: TRUE for standard sampler [default]; FALSE for sampler without liner |
N60 |
SPT N-value corrected for field procedures |
sigma |
effective vertical stress at the depth of interest (psf or kPa) |
metric |
logical variable: TRUE (for metric units) or FALSE (for English units) |
N60 = SPT blow count (N-value) corrected for field procedures, after Skempton (1986)
N1,60 = SPT blow count (N-value) corrected for field procedures and overburden pressure, using the Liao and Whitman (1986) stress correction
James Kaklamanos <kaklamanosj@merrimack.edu> and Kyle Elmy <ElmyK@merrimack.edu>
Liao, S.S.C., and Whitman, R.V. (1986). "Overburden Correction Factors for SPT in Sand", Journal of Geotechnical Engineering, Vol. 112, No. 3, pp. 373-377, ASCE.
Skempton, A.W. (1986). "Standard Penetration Test Procedures and the Effects in Sands of Overburden Pressure, Relative Density, Particle Size, Aging, and Overconsolidation", Geotechnique, Vol. 36, No. 3, pp. 425-447.
1 2 3 4 5 6 7 8 9 10 | ## Example code for SPT blow count (N-value) corrected for field
## procedures
N60(N = 11, Lr = 25, Db = 4, E = 0.50, SS = TRUE, metric = FALSE)
## Example code for SPT blow count (N-value) corrected for field
## procedures and overburden pressure
## In English units
N160(N60 = 8, sigma = 1500, metric = FALSE)
## In SI units
N160(N60 = 8, sigma = 90, metric = TRUE)
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