STABILITY EVALUATION OF SERMO DAM, …...STABILITY EVALUATION OF SERMO DAM, YOGYAKARTA, USING TWO...
Transcript of STABILITY EVALUATION OF SERMO DAM, …...STABILITY EVALUATION OF SERMO DAM, YOGYAKARTA, USING TWO...
STABILITY EVALUATION OF SERMO DAM, YO GYAKARTA, USING TWO COMPONENTS
ACCELERATION TIME HISTORIES CAUSES BY JAVA SUBDUCTION EARTHQUAKE SCENARIOS.
Windu Partono, Undayani Cita Sari
4th International Conference on Rehabilitation and Maintenance in Civil Engineering
Function
Dimension
Itaipu Dam in Parana River →supply electricity in Brazil & Paraguay
Earthquake Disaster
✓ The Aceh earthquake on 26 December 2004 was an earthquake in the sea and had a magnitude of 9.2 Mw which also caused a tsunami.
✓ The Yogyakarta earthquake was happened on 27 May 2006 with magnitude moment, 6.3 Mw.
Background
To evaluate the stability of Sermo dam due tosouth Java subduction earthquake scenarios.The analysis was performed by conductingtwo component acceleration time histories(North-South/NS and East-West/EWdirections) causes by four subduction sourceearthquake event scenarios as a seismic loadto dam structure..
Research Objective
Sermo Dam Position
No Soil and Rock Parameters Bedrock Shell Transition Filter Core
1γsaturated (kN/m3) 21.82 21.00 21.70 21.00 18.74
γunsaturated (kN/m3) 20.12 20.00 21.60 18.50 15.41
2 Cohesion ( C ) (kN/m2) 680 0.001 0.001 0.001 8.3
3 Friction Angle (ø) (degree) 55 43 35 35 32
4 Permeability Coeff. (k) (m/day) 8.53 12154.69 14.292 134.1 2.32 x 10-4
5 Young’s Modulus € (kN/m2) 320000 200000 150000 150000 100000
6 Poisson’s ratio (u) 0.45 0.35 0.30 0.30 0.45
7 Vs (m/s) 231 148 171 187 158
8 Vp (m/s) 768 491 357 458 330
Sermo Dam Model
Fault
Dimodifikasi dari Irsyam 2011
Data Analysis (Response Spectral Matching)
Due to uncompleted data related with theacceleration time histories from Javasubduction source, all acceleration timehistories used in this study were collectedfrom international ground motion databases.All acceleration time histories cannot directlybe used for dam stability analysis. Allacceleration time histories should be matchedwith the seismic mechanism of Javasubduction source.
Fault
Modified Ground motion
due to LasemFault
SpectralMatching Analysis
Calculate Target Spectral for specific earthquake
M1 and R1
Select Ground Motion in Terms of Acceleration Time
Histories For Scenario M and R
Dimodifikasi dari Irsyam 2011
Data Analysis (Response Spectral Matching)
Fault
Acceleration Time Histories Data
Seismic SourcesEpicentre Distance
(Km)Magnitude
(Mw)
Illapel, Chille (2015) 235 Km 8.3
Kodiak, Alaska (2018) 281.4 Km 7.9
South Sumatera, Indonesia (2007)
394 Km 8.4
Mentawai, Indonesia (2007)
167.7 Km 7.9
Fault
Analysis Results
-0.04
-0.03
-0.02
-0.01
0
0.01
0.02
0.03
0.04
0.05
0 10 20 30 40 50 60 70 80 90 100 110 120
Accele
rati
on
(g)
Time (s)
Two Component Acceleration Time South Sumatera Earthquake
Original NS
Original EW
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0 20 40 60 80 100 120 140 160
Accele
rati
on
(g)
Time (s)
Two Component Acceleration Time Histories Mentawai Earthquake
Original EW
Original NS
Original acceleration
time histories for South
Sumatera and Mentawai
Earthquake
Fault
Analysis Results
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0 0.5 1 1.5 2 2.5 3 3.5 4
Acc
eler
ati
on
(g
)
Period (s)
Spectra Target for South Sumatera Earthquake
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
0 0.5 1 1.5 2 2.5 3 3.5 4
Accele
rati
on
(g
)
Time (s)
Spectra Target for Mentawai Earthquake
Spectral Target for South
Sumatera and Mentawai
Earthquake
Fault
Analysis Results
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0 10 20 30 40 50 60 70 80 90 100 110 120
Acc
eler
atio
n (g
)
Time (s)
Two Component Acceleration Time Histories South Sumatera Earthquake
Matched NS
Matched EW
-0.1
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.1
0 20 40 60 80 100 120 140 160
Accele
ra
tio
n (g
)
Time (s)
Two Component Acceleration Time Histories Mentawai Earthquake
Matched EW
Matched NS
Matched acceleration time
histories for South Sumatera and Mentawai
Earthquake
Fault
Analysis Results
Position of displacement and PGA measurements
Fault
Analysis Results
Displacement of core zone measured
100
105
110
115
120
125
130
135
140
145
0 0.1 0.2 0.3 0.4 0.5 0.6
Da
m E
lev
ati
on
(m
)
Displacement (m)
Displacement At Core Zone
Vertical Displacement
Horizontal Displacement
Total Displacement
Fault
Analysis Results
PGA profiles at core position
110
115
120
125
130
135
140
145
1E-09 1E-08 1E-07 1E-06 1E-05 0.0001 0.001
Dam
Ele
vati
on
(m
)
PGA (g)
PGA Profile At Core ZoneChile EW
Chile NS
Alaska EW
Alaska NS
Mentawai EW
Mentawai NS
Sumatera Selatan EW
Sumatera Selatan NS
Fault
Comclusions
1. Based on the total displacement results calculated using four earthquake scenarios and the results calculated for original dam condition without earthquake loads it seems that all displacement analysis results are almost equal.
2. The maximum PGA value investigated at core zone of dam is 0.0001 g.
3. Sermo dam is predicted strong enough to resist earthquake causes by Java subduction megathrust earthquake with maximum magnitude 8.4 Mw and minimum epicentre distance approximately 160 Km.
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