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Full Description
Many existing embankment dams were designed and constructed to standards below current requirements, potentially posing risks to downstream populations. Dam owners must assess whether these structures provide adequate safety or require upgrades to reduce risks to acceptable levels. This book provides in-depth analysis of dam failure mechanics alongside relevant engineering assessment methods.
The book provides comprehensive methods for assessing embankment dam safety across four critical failure modes: overtopping, slope instability, deformations under seismic loading, and internal erosion and piping. Assessment approaches include deterministic (standards-based), risk-enhanced deterministic, quantitative risk assessment (QRA), and simplified QRA methodologies. These approaches represent current industry practice, drawing from the author's extensive experience in dam safety assessment and upgrade design across more than 200 dams in Australia, New Zealand, Canada, the USA, and Panama.
The book is designed to help dam owners, their consultant engineers, and engineering geologists develop defensible safety assessments and upgrade designs for existing dams.
Contents
1.Introduction 2. Terminology 3. Description of and Assessment of Potential Failure Modes and Data Gaps 4. Geotechnical Investigations of Existing Embankment Dams and Their Foundations 5. Hydrologic and Seismic Hazard Assessment 6. Estimating the Likelihood of Failure by Overflowing or Overtopping of the Embankment 7. Slope Instability and Deformations Leading to Loss of Freeboard and Overtopping 8. Deformation of Embankment Dams Under Seismic Loading and Assessment of the Likelihood of Loss of Freeboard 9. Internal Erosion and Piping - Concentrated Leak Erosion 10. Internal Erosion and Piping - Backward Erosion Piping, Suffusion and Global Backward Erosion 11. Contact Erosion and Other Mechanisms of Erosion into Soil and Rock Foundations 12. Internal Erosion and Piping - Filters and Continuation of Internal Erosion 13. Internal Erosion and Piping-Progression, Detection, Intervention and Repair, and Breach 14. Quantitative Risk and Simplified QRA Approaches to Assessing the Safety of a Dam For Internal Erosion and Piping 15. Historical Database Screening Method for Assessing the Annual Probability of Failure of a Dam Resulting from Internal Erosion and Piping. 16. Assessing the Safety of Concrete Face Rockfill Dams and Asphalt Face Dams 17. Assessing the Safety of Concrete and Asphalt Core Dams 18. Dam Safety Assessment 19. Measures for Upgrading Dams to Reduce Risks
