A Node package for simple geotechnic analysis.
This NPM package is developed based on [1], [2], [3], [4].
npm install geotekppu-js
const { CalcR1, CalcR2, CalcR3, CalcDiscontinuityClass, CalcR5, CalcRMR89 } = require('../geotekppu-js/rmr/rmr__bieniawski1989')
const { CalcRMRucs, CalcRMRrqdSpacing, RMRb } = require("../geotekppu-js/rmr/rmr_b_geocontrol2012")
const { CalcF0, CalcFexcavation, CalcICE } = require("../geotekppu-js/rmr/rmr_celada_etal2014")
let r1 = CalcR1("pls",16)
Rock Mass Rating (RMR) is a rating system proposed by Bieniawski (1989) to classify rock based on five classification parameters.
Parameters:
-----------
r1 : strength rating
r2 : Rock Quality Designation (RQD) rating
r3 : space of discontinuity rating
discontinuity_class : condition of discontinuity rating
r5 : ground water rating
Return(s):
----------
RMR89 / rock mass rating value which consists of:
- Rating value
- Class number (I, II, III, IV, V)
- Description (Very good rock, Good rock, Fair rock, Poor rock, Very poor rock)
Function r1:
r1(idx, value)
Strength of intact rock material rating.
Parameters:
-----------
idx : selected index either 'pls' for point-loads strength or 'ucs' for uniaxial compressive strength
value : strength of intact rock material (in MPa)
Return:
-------
val_r1 : rating value of strength of rock
Function r2:
r2(drillcoreRQD)
Drill core RQD rating.
Parameter:
----------
drillcoreRQD : drill core quality or rock quality designation (in percent)
Return:
-------
val_r2 : RQD rating
Function r3:
r3(spacing)
Space of discontinuity rating.
Parameters:
-----------
Value of rock spacing : spacing of rock (in m, float)
Return:
=======
val_r3 : space of discontinuity rating
Function discontinuity_class:
discontinuity_class(dl, sep, rough, gouge, weather)
Classification of discontinuity condition.
Parameters:
-----------
- dl: discontinuity length (persistence) in m (<1m; 1-3m; 3-10m; 10-20m; >20m) (type: Int)
- sep: separation (aperture) in mm (None; <0.1mm; 0.1-1.0mm; 1-5mm; >5mm) (type: None, Float)
- rough: roughness (very_rough; rough; slightly_rough; smooth; slickensided) (type: String)
- gouge: infilling (None; hl<5; hl>5; sl<5; sl>5) (type: None, String)
- weather: weathering (unweathered; slightly_weathered; moderately_weathered; highly_weathered; decomposed) (type: String)
Return:
-------
totalrating: total rating calculated from five parameters of discontinuity condition
Groundwater condition.
Parameters:
-----------
inflow - inflow per 10 m tunnel length (i/m)
wpress - joint water pressure / major principal
cond - general conditions (dry, damp, wet, dripping, or flowing)
Return:
-------
val_r5 : groundwater rating
RMRb or RMR basic is an improvement of RMR system by introducing improvement in rating of RQD and joint spacing, as proposed by Geocontrol (2012) as cited in Celada et.al (2014).
RMR(1) Uniaxial Compressive Strength of intact rock.
Parameters:
-----------
- strength: ucs of intact rock (in kg/cm2, for consistency it will be converted automatically to MPa)
Return:
-------
val_rmr_ucs: rating value of RMR(1) based on table by Geocontrol(2012)
RMR(2+3) RQD and spacing of joints.
Parameters:
-----------
- joints: joints per meter
Return:
-------
val_rmr_2_3: rating value of RMR(2+3)
RMRb - Rock Mass Rating basic for classifying rock mass as proposed by Geocontrol (2012) after Bieniawski (1989).
Parameters:
-----------
- rmr_ucs: rating of Uniaxial Compressive Strength rating of intact rock
- rmr_rqd_spacing: rating of RMR RQD and spacing of joints
- discontinuity: discontinuity condition as proposed in Bieniawski (1989) (see discontinuity_class() in rmr_bieniawski1989.py)
- groundwater: groundwater condition (see r5() in rmr_bieniawski1989.py)
Return:
-------
__rmrb: RMRb rating value
RMR14 is an improvement of RMR system by introducing several adjustment factors, namely f0 (adjustment factor for the orientation of tunnel axis with regard to main set of discontinuities), fe (adjustment factor considering excavation method (Tunneling Bore Method/TBM or Drill and Blast/D+B)), and fs (adjustment factor of stress-strain based on "Índice de Comportamiento Elástico" (ICE) value)
F0 is adjustment factor for the orientation of tunnel axis with regard to main set of discontinuities.
Parameters:
-----------
- strike_orientation: orientation of strike to tunnel axis ('dwd' or drive with dip, 'dad' or drive against dip, 'parallel', 'irrespective') (type: String)
- dip_angle: dip angle (dwd, dad, parallel: 45-90 or 20-45, irrespective: 0-20)
Return:
-------
val_f0: value of F0 / adjustment factor (always negative, otherwise 0)
Adjusment factor for RMR considering excavation method (Tunneling Bore Method/TBM or Drill and Blast/D+B).
Parameters:
-----------
- rmrb: RMRb rating value before adjustments (for rmrb > 40 and rmrb < 40)
Return:
-------
val_fe: value of adjustments factor based on excavation method
"Índice de Comportamiento Elástico" (ICE) as proposed by Bieniawski and Celada (2011).
Parameters:
-----------
- rmrb: value of RMRb
- ucs: uniaxial compressive strength of intact rock (in MPa)
- k0: ratio of the horizontal to vertical virgin stress
- H: tunnel depth (in meter)
- F: shape coefficient (circular tunnel d = 6 m -> F 1.3 ; circular tunnel d = 10 m -> F 1.0 ; coventional tunnel 14 m wide -> F 0.75 ; caverns 25 m wide x 60 m high -> F 0.55)
Return:
-------
val_ice: value of ICE
Adjustment factor of stress-strain based on "Índice de Comportamiento Elástico" (ICE) value.
Parameters:
-----------
- ice: "Índice de Comportamiento Elástico" (ICE) value.
Return:
-------
val_fs: adjustment factor for stress-strain.
Rock Mass Rating adjustment on very deep excavation work (400 - 600m) usually used for dangerous waste disposal.
Adjusted R1 (adjusted uniaxial compressive rock mass strength incorporating the influence of ground water weakening and temperature environment on deep located excavation project).
The equation of adjusted R1 proposed by Tong et.al (2022) is:
if strength (x) <= 250 MPa -> R1 = ((0.6343*math.log(x,10)) - 0.3627)
if strength (x) > 250 -> R1 = 15
Parameters:
-----------
- strength: uniaxial compressive strength test result of intact rock material/rock mass strength (in MPa)
Return:
-------
val_r1_adj: rating value of r1 (adjusted) as a continuous rating
Adjusted R2 - adjustment of rock quality designation rating.
Parameters:
-----------
- rqd: RQD rating/value (0-100).
Return:
-------
val_r2_adj: rating value of r2 (adjusted) as a continuous rating
Adjusted R3 - adjustment of rating value based on joint spacing.
Parameters:
-----------
- spacing: space of discontinuity
Return:
-------
val_r3_adj: value of r3 adjusted.
Adjustment rating for tunnel, foundation and slope based of favorability.
Parameters:
-----------
- cat: category (tunnel, foundation, slope) (type String)
- favorability: favorability opstion (vfav -> very favorable; fav -> favorable; fair; unfav -> unfavorable; vunfav: very unfavorable)
Return:
-------
val_r6: rating value of R6
Geostress correction / strength-stress ratio index / in-situ stress modification index (R7) as proposed in Tong et.al (2022) (a ration to measure the risk of rock bursts).
Denoted by the equation:
R7 = Sum of (Ri x Percentage of (i))
Where Ri for specific rock burst grade:
I (no rock burst) --> Ri = 0
II (slight rock burst) --> Ri = -4
III (moderate rock burst) --> Ri = -8
IV (severe rock burst) --> Ri = -12
Parameters:
-----------
- Ri: score of Ri based on rock burst grade
- Per(i): percentage of different rock burst grade
Return:
-------
val_r7: value of R7 (sum of (ri * per_i)) from all data
Rock Mass Permeability Index as main factor influence the water seepage in rocks material.
This value defined as:
R8 = -12 x (1 - Perm(<=10^-9m/s))
Parameters:
-----------
- perm_co: coefficient of permeability value and it should within the range <=10^-9 m/s. If permeability coefficient value == <=10^-9 m/s == 1, then R8 = -12 x (1-1) = 0. Otherwise, when permeability coefficient value == <=10^-9 m/s == 0, R8 is -12. The coefficient is between 0 and 1.
Return:
-------
val_r8: value of R8
The gorundwater chemistry index as proposed by Tong et.al (2022).
Parameters:
-----------
- pH: pH (acidity)
- tds: total dissolved solids (g/L)
- cl-: non/negatively charged chlorine (g/L)
Return:
-------
val_r9: value of R9
Slope Mass Rating is used to rate the slope for construction or other activities.
Correction factor F1 which depends on parallelism (denoted by "A") between discontinuity dip direction (alpha j) and slope dip (alpha s)
if ftype: P, then A = |alpha j - alpha s| OR absolute value of alpha j minus alpha s
if ftype: T, the A = |alpha j - alpha s - 180| OR absolute value of alpha j minus alpha s minus 180
Parameters:
-----------
- ftype: type of failure (P = planar, T = Toppling)
- dis_dd: discontinuity dip direction
- slope_d: slope dip
Return:
-------
val_f1: value of correction factor F1
Correction factor F2 related to the probability of discontinuity shear strength (B) (Romana, 1993), depends on the discontinuity dip. In case of failure type Planar: B = beta j ; in case of Toppling: B = 1.0
Parameters:
-----------
- ftype: type of failure (P = planar, T = Toppling)
- dis_dip: discontinuity dip angle
Return:
-------
val_f2: value of correction factor F2
Correction factor F3 indicates relationship (C) between slope (beta s) discontinuity dips (beta j) that is probability of the discontinuity to outcrop on the slope face (Romana, 1993) for planar failure (Romana, 2015)
Parameters:
-----------
- ftype: type of failure (P = planar, T = Toppling)
- slope: slope
- ddips: discontinuity dips
Return:
-------
val_f3: value of correction factor F3
Correction factor F4 considering the excavation method.
Parameters:
-----------
- method: excavation methods option ("pre": Presplitting; "sb": Smooth blasting; "ns": Natural slope; "bm": Blasting or mechanical)
Return:
-------
val_f4: value of correction factor F4
Slope Mass Rating (SMR) as proposed by Romana (1985, 2015).
Parameters:
-----------
- rmrb: RMR basic
- F1: correction factor F1 regarding parallelism
- F2: correction factor F2 regarding probability of discontinuity shear strength
- F3: correction factor F3 regarding
Return:
-------
smr: Slope mass rating value
[1] Bieniawski, Z.T. 1989. Engineering rock mass classifications. New York: Wiley.
[2] B. Celada, I. Tardáguila, P. Varona, A. Rodríguez, and Z. T. Bieniawski, “Innovating Tunnel Design by an Improved Experience-based RMR System.,” Proc. World Tunn. Congr. 2014 – Tunnels a better Life, vol. 3, pp. 1–9, 2014.
[3] Y. Tong, Y. Yue, Z. Huang, L. Zhu, Z. Li, and W. Zhang, “Modified RMR Rock Mass Classification System for Preliminary Selection of Potential Sites of High-Level Radioactive Waste Disposal Engineering,” Sustain., vol. 14, no. 23, pp. 1–17, 2022, doi: 10.3390/su142315596.
[4] Romana, M., Tomás, R., Serón, J.B. (2015). Slope Mass Rating (SMR) geomechanics classification: thirty years review. ISRM Congress 2015 Proceedings - International Symposium on Rock Mechanics, Quebec Canada, May 10 to 13 2015. ISBN: 978-1-926872-25-4, 10 pp.
[5] Z. Şen and B. H. Bahaaeldin, “Modified rock mass classification system by continuous rating,” Eng. Geol., vol. 67, no. 3–4, pp. 269–280, 2003, doi: 10.1016/S0013-7952(02)00185-0.
@software{Sasangka_GeotekPPU-JS_A_Node_2023,
author = {Sasangka, Daru Jaka and Hakim, Febri Fahmi},
month = {3},
title = {{GeotekPPU-JS: A Node module for simple geotechnic analysis}},
url = {https://github.com/febrifahmi/geotekppu-js},
version = {latest},
year = {2023}
}