Seismic Design of Slopes I - Indian Institute of Technology ...

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Embankment failure due to liquefaction in south of Lima Peru near the Pacific Ocean Slope Failures A Dam Breach – Piping Failure 3 Location: Walla Walla County Slope Failure!! Lower San Fernando Dam following the earthquake of 1971 (Photos from National Information Service for Earthquake Engineering, University of California, Berkeley) 4 2
Cause of Failure • Major Cause • Slope failure because of inertial loading • Increase in Shear Stress • Softening of materials strength or liquefaction. • Decrease in Shear Strength • Other Causes • Crest settlement of dam caused by settlement or by earthquake generated water waves in the reservoir. • Permanent deformation of foundation soils or dam body. • Fault displacement under the foundation. • Piping and erosion 5 Cause of Failure Increase in Shear Stress • Erosion / Excavation at the bottom of slope • Sudden drop in water level or drawdown of water bodies • Overloading at the top of slope • Water pressure from crack and fishers • Freezing of water creates even more pressure • Saturation of slopes due to rainfall • Transitory loading Earthquake loading 6 3
Page 1: Seismic Design of Slopes Earth Dams
Page 5 and 6: Preventive Measures 1. Additional d
Page 7 and 8: Static Slope Stability Analysis •
Page 9 and 10: Factor of safety • Along critical
Page 11 and 12: Concept of Average Acceleration Kra
Page 13 and 14: Seismic coefficient (contd….) •
Page 15 and 16: IITK-GSDMA Guidelines for Seismic C

Seismic Design of Slopes I - Indian Institute of Technology ...

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