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Earth Slope Stability Analysis – Part II

Earth Slope Stability Analysis – Part II. M. Zoghi, Ph.D., P.E. Department of Civil & Environmental Engineering Idaho State University Fall 2008. Outline. Review Taylor Charts Bishop – Morganstern Charts Barnes Charts Spencer Charts Morgansern Charts for Rapid Drawdown

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Earth Slope Stability Analysis – Part II

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  1. Earth Slope Stability Analysis – Part II M. Zoghi, Ph.D., P.E. Department of Civil & Environmental Engineering Idaho State University Fall 2008

  2. Outline Review Taylor Charts Bishop – Morganstern Charts Barnes Charts Spencer Charts Morgansern Charts for Rapid Drawdown Stabilization Techniques Examples

  3. I. Review

  4. Method of slices

  5. Fellenius Method

  6. Simplified Bishop Method

  7. II. Taylor Charts

  8. III. Bishop – Morganstern Charts

  9. IV. Barnes Charts

  10. V. Spencer Charts

  11. VI. MorgansternCharts for Rapid Drawdown

  12. VII. Stabilization Techniques

  13. What is the cause of movement?

  14. Monitoring Techniques Where is the location of slip surface?

  15. 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

  16. Slopes Flattened or Benched

  17. Berm Provided at ToeWeight Increases the Resistance to Sliding

  18. Protection Against Erosion Provided at Toe

  19. Lowering of GWT to Reduce the Pore Pressures

  20. Drainage of Slopes Drains are added to stabilize slopes

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

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

  23. Plan for Building Design to aid Slope Stability

  24. VIII. Examples

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