bearingCapacityFactors: Bearing Capacity Factors

In geotech: Geotechnical Engineering

Description

Calculate the bearing capacity factors (Nc, Nq, Ngamma) using either the Terzaghi or Vesic methods.

Usage

Nq(phi, case = "general", method = "Terzaghi")
Nc(phi, case = "general", method = "Terzaghi")
Ngamma(phi, case = "general", method = "Terzaghi")

Arguments

phi	friction angle (degrees)
case	"general" or "local" to indicate general or local shear failure ("general" is default)
method	"Terzaghi" or "Vesic" ("Terzaghi" is default)

Details

• For local shear, the friction angle is reduced to a value equal to atan(2/3 * tan(phi)).

• Ngamma from the Terzaghi method uses the approximate equation of Coduto et al. (2016).

Value

Bearing capacity factor (Nc, Nq, or Ngamma)

Author(s)

James Kaklamanos <[e-mail]> and Kyle Elmy <[e-mail]>

References

Coduto, D.P., Kitch, W.A., and Yeung, M.R. (2016). Foundation Design: Principles and Practices, Pearson, Boston.

Terzaghi, K. (1943). Theoretical Soil Mechanics, John Wiley, New York

Vesic, A.S. (1973). Analysis of Ultimate Loads of Shallow Foundations, ASCE Journal of the Soil Mechanics and Foundations Division, Vol. 99, No. SM1, pp. 45-73.

See Also

bearingCapacity, bearingPressure

Examples

Nq(phi = 20, case = "local", method = "Terzaghi")
Nc(phi = 20, case = "local", method = "Terzaghi")
Ngamma(phi = 20, case = "local", method = "Terzaghi")

Example output

[1] 3.875274
[1] 11.84963
[1] 1.784438

geotech documentation built on May 1, 2019, 9:09 p.m.