This document discusses methods for processing geotechnical data. It summarizes three common systems used for classifying rockmass: the RMR system, SMR system, and Geological Strength Index (GSI). It then provides details on the RMR system, including a table of parameter ranges and values. Additional sections cover the orientation of joints and their impact on slopes, and methods for slope excavation.

1. PENGOLAHAN DATA GEOTEKNIK

2. Pengertian dan Tujuan
 Pengertian :
Pengolahan data geoteknik adalah
proses pengumpulan, perhitungan,
dan penilaian data hasil penyelidikan
geoteknik.
 Tujuan :
Menentuan karakteristik massa
batuan yang dianggap mewakili.

3. Sistem Klasifikasi
 RMR system (Bieniawski, 1989)
 SMR (Romana, 1985)
 Geological Strength Index (Hoek, 1994)

4. Alur Data Geoteknik

5. Intact Rock Vs Rockmass

6. RMR system (Bieniawski,1989)
NO.
1 Strength of Term Extremely Strong Very Strong Strong Medium Strong Weak Very Weak Extremely Weak
intact rock Code R6 R5 R4 R3 R2 R1 R0
Value >250 MPa 100 - 250 MPa 50 - 100 MPa 25 - 50 MPa 5-25 Mpa 1-5 Mpa < 1 Mpa
Rating 15 12 7 4 2 1 0
2 RQD Term Excellent Quality Good Quality Fair Quality Poor Quality
Code E G F P
Value 90% - 100% 75% - 90% 50% - 75% 25% - 50%
Rating 20 17 13 8
3 Spacing of Term Very Wide Wide Moderate Close
Discontinuities Code VW W M C
Value > 2 m 0.6 - 2 m 200 - 600 mm 60 - 200 mm
Rating 20 15 10 8
4 Condition of discontinuities (detailed)
a) Discontinuity length Term Very Low Low Medium High
(persistence) Code VL L M H
Value < 1 m 1-3 m 3-10 m 10-20 m
Rating 6 4 2 1
b) Separation (aperture) Term None Very tight joint Tight joint Moderately Open Joint
Code N VT T M
Value - < 0.1 mm 0.1-1.0 mm 1-5 mm
Rating 6 5 4 1
c) Roughness Term Very Rough Rough Slightly Rough Smooth
Code VR R SR SM
Roughness
Rating 6 5 3 1
Code N H1 H2 S1
d) Infilling (gouge) Term None Hard filling < 5mm Hard filling > 5 mm Soft filling < 5mm
Rating 6 4 2 2
Code UW SW MW HW
e) Weathering Term Unweathered Slightly Weathered Moderately Weathered Highly weathered
Rating 6 5 3 1
5 Ground Water Code CD DM WT DR
Term Completely Dry Damp Wet Dripping
Rating 15 10 7 4
3
5
0
0
PARAMETER RANGE OF VALUE
Very Poor Quality
VP
< 25%
Very Close
VC
< 60 mm
Very High
VH
> 20m
Open Joint
O
> 5 mm
Slickensided
SL
0
S2
Soft filling > 5mm
0
D
Decomposed
FL
Flowing
0
0

7. Joint Orientation (Romana,1985)
Case
Very
Favorable
Favorable Fair Unfavorable
Very
Unfavorable
P |αj-αs| >300 30-200 20-100 10-50 <50
T |αj-αs-180|
P/T F1 0.15 0.40 0.70 0.85 1.00
P |βj| <200 20-300 30-300 35-450 >450
T F2 0.15 0.40 0.70 0.85 1.00
P F2 1 1 1 1 1
P βj – βs >100 10-00 00 0-(-100) <-100
T βj + βs <1100 110-1200 >1200
P/T F3 0 -6 -25 -50 -60
P = plane failure αs = slope dip direction αj = joint dip direction
T = toppling failure βs = slope dip βj = joint dip

8. Slope Excavation
Method Natural slope Presplitting
Smooth
Blasting
Reguler
Blasting
Deficient Blasting
F4 +15 +10 +8 0 -8
SMR = RMR – (F1 x F2 x F3) + F4
Class No. V IV III II I
SMR 0-20 21-40 41-60 61-80 81-100
Description Very poor Poor Fair Good Very good
Cohesion (KPa) <100 100-200 200-300 300-400 >400
Friction Angle
(degree)
<15 15-25 25-35 35-45 >45
σcM (MPa) 30 12 5 2.5 0.5
Rockmass Class
SMR > 50
EM = 2 x SMR – 100 (GPa)
SMR < 50
EM = 10(SMR-10)/40

9. GSI (RocLab)

10. TERIMA KASIH