Calculates the Hoek-Brown criterion for the given data and for the given level of stress (unit weight and depth).
Hoek_Brown( sig.ci, GSI, mi, MR, D, height, unit.weight, use = c("general", "tunnels", "slopes") )
| sig.ci | The unconfined compressive strength of the intact rock, in MPa |
|---|---|
| GSI | The Geological Strength Index |
| mi | The intact rock constant |
| MR | the modulus ratio |
| D | The quality of the explosive campaing design |
| height | The height or depth for which to determine the stress level and parameters |
| unit.weight | The unit weight of the rock, in kN/m3 |
| use | The use expected for the rock mass (general, tunnels, or slopes) |
A list with a list of the resulting parameters of the rock mass and 3 data frames: Shear envelopes for Mohr-Coulomb and Hoek-Brown criteria, Principal stresses envelopes for Mohr-Coulomb and Hoek-Brown criteria, and stress level for the given height and unit weight
Tables for some of the input parameters can be found in the directory where the package is installed, just run the following command to find this path: system.file(package = "GMisc")
Hoek, E. & Brown, E. T. (1980). Empirical strength criterion for rock masses. J. Geotech. Eng. Div. ASCE 106 (GT9): 1013-1035.
Hoek, E., Carranza-Torres, C. & Corkum, B. (2002). Hoek-Brown Failure Criterion - 2002 Edition. Proc. NARMS-TAC Conference, Toronto. 267-273.
Hoek, E. & Marinos, P. (2007). A brief history of the development of the Hoek-Brown criterion. Soils and Rocks, No. 2.
sig.ci = 16 GSI = 75 mi = 13 MR = 300 D = 0 height = 40 unit.weight = 18.6 Hoek_Brown(sig.ci, GSI, mi, MR, D, height, unit.weight)#> $Results #> $Results$sig.ci #> [1] 16 #> #> $Results$GSI #> [1] 75 #> #> $Results$mi #> [1] 13 #> #> $Results$D #> [1] 0 #> #> $Results$mb #> [1] 5.32 #> #> $Results$s #> [1] 0.0622 #> #> $Results$a #> [1] 0.501 #> #> $Results$MR #> [1] 300 #> #> $Results$Ei #> [1] 4800 #> #> $Results$sig.3.max #> [1] 4 #> #> $Results$sig.t #> [1] -0.187 #> #> $Results$sig.c #> [1] 3.98 #> #> $Results$sig.cm #> [1] 5.87 #> #> $Results$Erm #> [1] 3918.48 #> #> $Results$phi #> [1] 40.1 #> #> $Results$c #> [1] 1.45 #> #> $Results$phi.h #> [1] 52.5 #> #> $Results$c.h #> [1] 0.72 #> #> #> $shear #> # A tibble: 12,564 × 3 #> sig.n crit tau #> <dbl> <chr> <dbl> #> 1 -0.187 Hoek-Brown 0.001 #> 2 -0.187 Mohr-Coulomb 0 #> 3 -0.187 Stress level 0 #> 4 -0.186 Hoek-Brown 0.011 #> 5 -0.186 Mohr-Coulomb 1.29 #> 6 -0.186 Stress level 0.478 #> 7 -0.185 Hoek-Brown 0.018 #> 8 -0.185 Mohr-Coulomb 1.29 #> 9 -0.185 Stress level 0.479 #> 10 -0.184 Hoek-Brown 0.024 #> # … with 12,554 more rows #> #> $princ.stress #> # A tibble: 8,376 × 3 #> sig.3 crit sig.1 #> <dbl> <chr> <dbl> #> 1 -0.187 Hoek-Brown 0 #> 2 -0.187 Mohr-Coulomb 0 #> 3 -0.186 Hoek-Brown 0.113 #> 4 -0.186 Mohr-Coulomb 5.37 #> 5 -0.185 Hoek-Brown 0.231 #> 6 -0.185 Mohr-Coulomb 5.38 #> 7 -0.184 Hoek-Brown 0.323 #> 8 -0.184 Mohr-Coulomb 5.38 #> 9 -0.183 Hoek-Brown 0.402 #> 10 -0.183 Mohr-Coulomb 5.39 #> # … with 8,366 more rows #> #> $stress.level #> # A tibble: 1 × 3 #> sign tau crit #> <dbl> <dbl> <chr> #> 1 0.744 1.69 Stress level #>