earthquake safety of existing dams - ecees.org .pdf · earthquake safety of existing dams ......
TRANSCRIPT
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EARTHQUAKESAFETY OF
EXISTING DAMSDr. Martin Wieland
Chairman, ICOLD Committee on Seismic Aspects of Dam Design
Pöyry Energy Ltd., Zurich, SwitzerlandFormerly Electrowatt-Ekono Ltd.
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LARGE DAMS INSWITZERLAND
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Leading Roleof
Switzerlandin Dam
Construction
200019001880 19801920 196019401860
1935 Dixence, world‘s highest buttress dam
Hydro-energy production 36‘000 GWh
1957 Mauvoisin, world‘s highestarch dam 237 (250) m
1920 Europe‘s first arch dam
1913 Ritter, Thesis on analysis of arch dams
1961 Grande Dixence, world‘shighest concrete dam, 285 m
1924 Schräh, world‘s highest gravity dam,112 m
Most existing dams
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Grande Dixence Gravity Dam, SwitzerlandHighest concretedam in world
Dam height: 285 m
Dam volume: 6 million m3
Reservoir volume: 400 million m3
Crest length: 695 m
Completion date: 1961
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Extreme environment
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Mauvoisin Arch Dam, 250 mSuccessful Operation forover 45 Years
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Mauvoisin damheightening by13.5 m to 250 m,completed 1991
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LARGE DAMS INHIGHLY SEISMIC
REGIONS
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Usoy landslide dam,Lake Sarez, Tajikistan,
Height: ca. 650 m,Landslide triggered by 1911
M = 7.3 earthquake, region ofvery high seismicity
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‘Lake Sarez‘ Dam, unstable rock mass inreservoir of over 0.5 billion m3
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Nurek Dam, Tajikistan, 300 m
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Enguri Arch Dam, 272 m
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Rogun Dam, planned highest dam, 335 m
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EXAMPLES OF MAJORDAMS UNDER DESIGN
AND/ORCONSTRUCTION IN
SEISMIC AREAS
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Bakhtyari arch dam,Iran, Height: 315 m,Zagros mountains
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Bakhtyari arch dam, Iran, 315 m
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Left abutment
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Dibang gravity dam,India, 288 m
foothills of Himalayas
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Dibang Dam Project, India, 288 m
30 m
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Mishmi Fault near Dibang Dam Site, India
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Deriner arch dam, 250 m, Turkey
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Ghir arch-gravity dam, Iran, 128 m
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Shear Keys at Contraction Joints
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SEISMIC HAZARD
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July 26, 2003 Miyagi Earthquake, JapanLocation NS EW Vertical Distance (km)
Magnitude 5. 5 ShockYamoto 366 476 360 cm/s2 4.1Naruse 603 2005 584 3.9Kasimadai 516 489 183 7.6Nanngou 268 229 226 6.5
Magnitude 6.2 Main shockYamoto 667 850 1242 4.2Nangou 366 491 193 9.9Naruse 636 756 923 1.0Kasimadai 1606 910 492 10.5
Magnitude 5.3 ShockKanan 649 356 499 1.1Nangou 276 166 126 4.9Wakutani 255 342 130 6.9
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Tokachi-Oki earthquake, Sept. 26, 2003Effects on dams
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Seismic hazard at dam site in Australia
0.001
0.01
0.1
1
10
1 10 100 1000 10000 100000
Years (annee)
Accele
rati
on
(P
GA
, g
)
500 years: 0.07 g
10,000 years: 0.4 g
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Seismicity in Andaman Sea after M = 9.1earthquake of 26.12.2004
DAILY AFTER SHOCK PATTERN
0
1
2
3
4
5
6
7
8
9
10
0 10 20 30 40 50 60 70 80
Days ( 0 date starts on 26.12.2004)
Ma
gn
itu
de
Series2
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Kalpongrockfill dam,AndamanIslands, 2004
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SEISMIC SAFETYOF EXISTING
DAMS
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EARTHQUAKEBEHAVIOUR AND
DAMAGE OF LARGECONCRETE DAMS
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Manjil earthquake 1990, Sefid Rud Buttress Dam
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Seismic Cracks in Sefid Rud Buttress Dam
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Transmission tower failure due to rockfall
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Buildings at dam site , Sefid Rud dam
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Manjil earthquake 1990
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Manjil earthquake 1990
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Rockfalls,
Manjilearthquake1990
Rockfalls, Manjil earthquake
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Manjil earthquake 1990
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Manjil earthquake 1990
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Lower Crystal Springs Gravity Damsurvived 1906 San Francisco EQ undamaged
Dam heightening
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Lower Crystal Springs dam
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REPAIR OFDAMAGED
CONCRETE DAMS
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Cracks inSefid Ruddam
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Repair of Sefid Rud dam, 1990Anchoring force per block: 100 MN, 12 anchors
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Manjil earthquake 1990, repair works
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Manjil earthquake 1990, repair works
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Repair of Koyna dam, India
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Strengthening of Koyna dam, India
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FAULTS IN DAMFOUNDATION
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Manjil earthquake 1990, Sefid Rud damcrack in bottom gallery, damaged grout curtain
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Chi-Chi earthquake 1999, Shih-Kang Dam
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Damage in intake structure and water tunnel ofShih-Kang dam caused by fault movements during
1999 Chi-Chi earthquake, Taiwan
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OBSERVEDEARTHQUAKEEFFECTS ON
EMBANKMENTDAMS
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Bhuj earthquake 2001, Irrigation dams
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Bhuj earthquake 2001
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Bhuj earthquake 2001
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Bhuj earthquake 2001
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Bhuj earthquake 2001
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Bhuj earthquake 2001
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San Fernando earthquake 1971
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San Fernando earthquake 1971
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Slide in Kitayama Dam, Kobe Earthquake 1995
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Observed Earthquake Performance ofEmbankment Dams
• Modern well-built embankment dams haveperformed well
• Compacted clay dams have performed well
• Rockfill and concrete-faced rockfill damshave performed well (very limitedexposure to strong ground shaking)
• Insufficiently compacted sand or silt damsand tailings and hydraulic fill dams haveperformed poorly
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SEISMICREHABILITATION
OFEXISTING DAMS
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Seismic improvements of 116 damsCalifornia
36 Temporary storage restrictions34 Buttresses added or slopes flattened
on earth dams27 Freeboard increased
21 Outlet works rehabilitations
12 Permanent storage restrictions
11 Foundation and/or embankmentmaterials removed and replaced
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Seismic rehabilitation of spillway on crest ofWhakamaru gravity dam, New Zealand
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Rehabilitation of crest spillwayDesign: 0.1 g, Rehabilitation: 1.8 g
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Seismic rehabilitation of multiple arch dam
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Seismic rehabilitation of embankment dam
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Seismic rehabilitation of embankment dam
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NEW TYPES OFDAMS:
CONCRETE FACEROCKFILL DAMS
(CFRD)
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Problem of Concrete Face under Seismic Action
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River embankmentPossible failure mode for top portion of CFRD
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DAM SAFETY
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Integral Dam Safety ConceptStructural SafetyStiffness, Strength and DuctilityDeformations and Stability, etc.Safety MonitoringSeismic instrumentation, Visual observationsData analysis and interpretation, etc.Operational SafetyRule curves, operation guidelinesQualified staff, Maintenance, etc.Emergency PlanningWater alarm, Flood plane mapping, Evacuationplans, Engineering back-up, etc.
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STRUCTURALSAFETY:
SEISMIC DESIGNCRITERIA
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Overview on seismic design criteriaDam and safety-relevant elements:Operating basis earthquake, OBE (145 years)Safety evaluation earthquake, SEE (ca.10,000 years)
Appurtenant structures:Use of seismic building codes (ca. 475 years)
Temporary structures:Use of seismic building codes (< 475 years)Probability of exceedance of 10% during construction
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OBE: Linear seismic dam analysis
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SEE: Rigid body analysis of concrete blocks
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DAM SAFETYMONITORINGStrong Motion
Instrumentation
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Strong motion instrumentation of dams
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Strong motion instruments in dam
MinimumSystemDam crest
Dam base
Free field
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Distribution of dams with seismographs, Japan(Ministry of Land, Infrastructure and Transport)
140 dams in 1994; 413 dams in 2003
500km
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Free vibration of reservoir
!"
!#
!$
%
$
#
"
% $ # "
Four
ier s
pect
rum
3 period (min.) 10
100
10
3
time (h)
Water level in reservoir cm
Natural period T= 6.5 min
Damping ratio0.02
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OPERATIONALSAFETY
OF DAMS
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Taum Sauk CFRD dam failure, USA, 14.12.2005Pump Storage Reservoir, overtopping due to uncontrolled
pumping
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EMERGENCYPLANNING: WATERALARM SYSTEMSFOR LARGE DAMS
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Flood plain
EvacuationMap: WaterAlarm
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Evacuation mapof Zurich:Water AlarmDam Break
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ACTIVITIES OF COMMITTEE ONSEISMIC ASPECTS OF DAM
DESIGNOF
INTERNATIONAL COMMISSIONON LARGE DAMS (ICOLD)
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• Bulletin 52 (1986), Earthquake analysisprocedures for dams – State of the Art(Zienkiewicz, Clough, Seed)
• Bulletin 72 (1989): Selecting seismicparameters for large dams (under revision)
• Bulletin 112 (1998): Neotectonics and dams• Bulletin 120 (2001): Design features of dams
to effectively resist seismic ground motion• Bulletin 123 (2002): Earthquake design and
evaluation of structures appurtenant to dams• Bulletin (2007) Reservoirs and Seismicity
ICOLD BULLETINS
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Terms of Reference, May 2005-2009• Revision of existing seismic bulletins• Seismic safety of existing dams• Seismic instrumentation of dams• Seismic risk aspects of dams (seismic
hazard and seismic vulnerability)• (Seismic analysis of dams)
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Conclusions•Dams are not inherently safe againstearthquakes.
•Technology for building dams that cansafely resist strong ground shaking isavailable.
•New safety concepts are still needed for(i) very large dams in highly seismicregions,(ii) new types of dams such as CFRD andRCC dams,(iii) dams at difficult sites.
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Conclusions•In regions of low to moderate seismicitywhere strong earthquakes occur very rarely,it is sometimes believed(i) that too much emphasis is put onearthquake safety,(ii) that dams designed for a seismiccoefficient of 0.1 are safe againstearthquakes.
•These assumptions are incorrect!
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Conclusions
•Emergency planning and theinstallation of water alarm systems inthe downstream region of large damsis a must. Even if a dam is structurallysafe, there are natural or man-madeevents that could cause failure.
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Conclusions•For emergency planning to beeffective, the population affected mustbe involved and informed about whatto do in an emergency.
•The first water alarm systems fordams were installed in Switzerlandsome 50 years ago and Swissengineers have been at the forefrontof emergency planning ever since.
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Fifth InternationalConference on DamEngineering (DM07),
Lisbon, PortugalFebruary 14 -16, 2007