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)
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
