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Earth Slope Stability Analysis – Part III

Earth Slope Stability Analysis – Part III. M. Zoghi, Ph.D., P.E. Department of Civil & Environmental Engineering Idaho State University Fall 2007. Outline. Review Spencer and Morganstern -Price Methods Janbu Method Sliding Block Analysis Stabilization Techniques. I. Review.

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Earth Slope Stability Analysis – Part III

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  1. Earth Slope Stability Analysis – Part III M. Zoghi, Ph.D., P.E. Department of Civil & Environmental Engineering Idaho State University Fall 2007

  2. Outline Review Spencer and Morganstern-Price Methods Janbu Method Sliding Block Analysis Stabilization Techniques

  3. I. Review

  4. Method of slices

  5. Fellenius Method

  6. Simplified Bishop Method

  7. II. Spencer / Morganstern-Price Methods

  8. Spencer and Morganstern-Price Methods

  9. III. Janbu Method

  10. Janbu Method

  11. Correction Factor

  12. Example Problem – Janbu Method

  13. IV. Sliding Block Analysis

  14. V. Stabilization Techniques

  15. Monitoring Techniques

  16. Stabilization Methods Selection Criteria: • Subsurface conditions & potential modes of failure • The present & required topography • Physical constraints – property lines or buildings • Consequences of failure • Availability of materials, equipment, & expertise • Local performance history • Aesthetics • Time required for construction • Cost

  17. Slopes Flattened or Benched

  18. Berm Provided at ToeWeight Increases the Resistance to Sliding

  19. Protection Against Erosion Provided at Toe

  20. Lowering of GWT to Reduce the Pore Pressures

  21. Drainage of Slopes Drains are added to stabilize slopes

  22. Use of Driven or Cast-in-Place Piles

  23. Retaining Wall OR Sheetpiling OR Cylinder Piles Provided to Increase Resistance to Sliding

  24. Plan for Building Design to aid Slope Stability

  25. Rockslide Sheds A concrete rockslide shed in Taiwan

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