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Earthquake Engineering Department
 

ISSUES

 
  • Strong motion characterization for design.
  • Geo-technical investigation for foundations for dam and appurtenant structures.
  • Structural design of dam and appurtenant structures.
  • Monitoring of seismic activity in and around the dam site.
 

COURSES OFFERED

 
  The Earthquake department offers Master of Technology in following areas:
 
  • Structural Dynamics
  • Soil Dynamics
  • Seismic Vulnerability and Risk Assessment
 

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Research Scholars

 
Year Ph.D. Intake Ph.D. Awarded Total

2008

09

10

19

2009

10

07

24

2010

10

05

32

2011

09

04

41

2012

04

04

44
 
 

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EARTHQUAKE DESIGN PARAMETERS

 
  • To ensure safety of dam structures against earthquakes.
  • IS-Code recommendations for seismic loading are not adequate.
  • Site specific earthquake design parameters are estimated based on the perceived seismic threat to the dam structure.
  • 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

 
  • Recording of strong ground motion around the dam.
  • Recording of strong ground motion in the body of the dam.
  • Strong motion characterization for the region in and around the dam.
  • To check analytical model of dam from the strong motion data.

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DYNAMIC SOIL TESTING

 
  • Tests for evaluating dynamic soil parameters.
    In-situ tests are conducted on test beds of various constituent materials of the dam.
    Tests conducted are -
  • Wave propagation test,
  • Block vibration test,
  • Dynamic plate load test.
  • Results reported as variation of shear modulus versus strain.

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CROSS BOREHOLE TEST

 
  • In-situ shear wave velocity determination
  • Provides greater measurement accuracy as the observed shear wave travels through a particular stratum with less interference from nearby refracting horizons.
  • Capable of measuring the dynamic material parameters of individual strata in the rock/ soil deposit.

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SOIL LIQUEFACTION STUDIES

 
  • Steady state horizontal vibrations
  • Accelerations up to 2.0g
  • Frequency: 5,10,15 Hz.
  • Displacement: 20 mm
  • Table size: 1.2m 0.9m 0.6m (ht)
  • Evaluation of liquefaction potential of saturated sand / silt deposits.

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DYNAMIC TRIAXIAL TEST APPARATUS

 
  • Vertical loading:
  • Electro-Pneumatic, static closed Loop servo system and dynamic sine load control system (Open loop)
  • Capacity: - static: 300kgf
  • Dynamic: 300100kgf
  • Static speed: 0.05-40% FS/min
  • Dynamic frequency: 0.01- 3 Hz.
  • Lateral pressure capacity: 10kgf
  • Back pressure capacity: 10kgf
  • Sample size: 35mm φ X 70mm, 50mm φ X 100mm

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SEISMIC SAFETY OF DAMS

 
  • Structural analyses -
  • Static analysis
  • Free vibration analysis
  • Dynamic analysis

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EFFECT OF OPERATION SEQUENCE ON DAM SAFETY

 
  • 2D Non-linear sequential analysis -
  • Schedule of raising dam and reservoir filling.
  • Material property variation with confining pressure.
  • Elasto-Plastic material model.

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MICRO-EARTHQUAKE MONITORING

  • Micro-Earthquake (MEQ) monitoring prior and after impounding of reservoir.
  • Monitoring of seismic activity around the dam.
  • Identification of seismically active zone and tectonic feature.
  • Study of reservoir induced seismicity.
1 Name & address Dr. M. L. Sharma, Head, Department of Earthquake Engineering
2

Phone

91-01332-285536
3 Available man power Faculty 20 nos.
4

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.

5

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.

6

Any collaboration with other institutions in these areas.

NHPC, NTPC, THDC

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