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Related Information |
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ISSUES |
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Strong motion characterization for design. |
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Geo-technical investigation for foundations for dam and
appurtenant structures. |
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Structural design of dam and appurtenant structures. |
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Monitoring of seismic activity in and around the dam site. |
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EARTHQUAKE DESIGN PARAMETERS |
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To ensure safety of dam structures against earthquakes. |
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IS-Code recommendations for seismic loading are not adequate. |
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Site specific earthquake design parameters are estimated based
on the perceived seismic threat to the dam structure. |
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Representative ground motions have to be simulated as recorded
motions are generally not available for seismic analysis. |
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STRONG GROUND MOTION RECORDING |
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Recording of strong ground motion around the dam. |
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Recording of strong ground motion in the body of the dam. |
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Strong motion characterization for the region in and around the
dam. |
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To check analytical model of dam from the strong motion data. |
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DYNAMIC SOIL TESTING |
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Tests for evaluating dynamic soil parameters.
In-situ tests are conducted on test beds of various constituent
materials of the dam.
Tests conducted are - |
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Wave propagation test, |
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Block vibration test, |
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Dynamic plate load test. |
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Results reported as variation of shear modulus versus strain. |
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CROSS BOREHOLE TEST |
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In-situ shear wave velocity determination |
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Provides greater measurement accuracy as the observed shear
wave travels through a particular stratum with less interference
from nearby refracting horizons. |
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Capable of measuring the dynamic material parameters of
individual strata in the rock/ soil deposit. |
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SOIL LIQUEFACTION STUDIES |
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Steady state horizontal vibrations |
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Accelerations up to 2.0g |
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Frequency: 5,10,15 Hz. |
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Displacement: 20 mm |
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Table size: 1.2m ´ 0.9m ´ 0.6m (ht) |
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Evaluation of liquefaction potential of saturated sand / silt
deposits. |
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DYNAMIC TRIAXIAL TEST APPARATUS |
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Vertical loading:
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Electro-Pneumatic, static closed Loop servo system and dynamic
sine load control system (Open loop) |
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Capacity: - static: 300kgf |
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Dynamic: 300±100kgf |
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Static speed: 0.05-40% FS/min |
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Dynamic frequency: 0.01- 3 Hz. |
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Lateral pressure capacity: 10kgf |
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Back pressure capacity: 10kgf |
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Volume change capacity: 25ml
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Sample size: 35mm φ X 70mm, 50mm φ X 100mm |
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SEISMIC SAFETY OF DAMS |
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Structural analyses |
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Static analysis |
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Free vibration analysis |
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Dynamic analysis |
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EFFECT OF OPERATION SEQUENCE ON DAM SAFETY |
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2D Non-linear sequential analysis - |
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Schedule of raising dam and reservoir filling. |
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Material property variation with confining pressure. |
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Elasto-Plastic material model. |
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MICRO-EARTHQUAKE MONITORING |
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Micro-Earthquake (MEQ) monitoring
prior and after impounding of reservoir. |
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Monitoring of seismic activity
around the dam. |
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Identification of seismically
active zone and tectonic feature. |
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Study of reservoir induced
seismicity. |
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| 1 |
Name &
address |
Dr.H.R.Wason, Head,
Department of Earthquake Engineering |
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Phone |
91-01332-285556 |
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Available
man power |
Faculty 22 nos. |
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Scientific/technical areas for which support can be provided to
user organizations. |
Monitoring Micro earthquake and strong motion recording around
site.
Earthquake design parameters for project sites
Analysis of water retaining structure (such as Dams, Barrages)
Tunnels etc. |
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Existing work/collaboration with user organisations in
Uttarakhand. |
Tehri Hydro Development Corporation, National Hydropower
Corporation, National Thermal Power Corporation, Instrumental
in getting clearance for Tehri Dam. Monitoring micro earthquake
activity around Tehri Dam site. Instrumented Tehri Dam for
strong motion monitoring. |
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Any collaboration with other institutions in these areas. |
NHPC, NTPC,
THDC |
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