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Calibration of Design Methods for Slope Stabilization and Earth Retention

Calibration of Design Methods for Slope Stabilization and Earth Retention. J. Erik Loehr Civil and Environmental Engineering University of Missouri - Columbia. General Design Approach. Motivation. Design methods appear conservative Have performance data, but it’s underutilized

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Calibration of Design Methods for Slope Stabilization and Earth Retention

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  1. Calibration of Design Methods for Slope Stabilization and Earth Retention J. Erik Loehr Civil and Environmental Engineering University of Missouri - Columbia

  2. General Design Approach

  3. Motivation • Design methods appear conservative • Have performance data, but it’s underutilized • Would like to make prudent use of performance data to improve design methods

  4. “Calibration” of Design Method • Objective is design method that predicts F=1.0 when deformations becomes “just unacceptable”

  5. Required Data • Deformations as function of time • Inclinometers • Surface surveys • Piezometric levels as function of time • Soil/Rock properties • Loads/moments in members not required, but helpful

  6. I435-Wornall Road Site June 2001

  7. I435-Wornall Road “As-Built”

  8. I435-Wornall Site Instrumentation

  9. I435-Wornall Site: Piezometric Levels

  10. I435 Site Piezometric Levels

  11. Theoretical Factors of Safety

  12. I435-Wornall Road Performance

  13. Field Performance Function

  14. Field Performance Functions

  15. Theoretical Factors of Safety

  16. Conclusions • Approach at least produces method that is consistent with observed field behavior • Non-uniqueness in approach can be addressed by performing additional calibrations • Limited to application for similar techniques • Prudent basis for incrementally improving design over time

  17. Large-scale modeling

  18. Acknowledgements • Project Sponsors • Missouri Department of Transportation, project RI98-007 • National Science Foundation, project CMS0093164 • Recycled Materials Resource Center, UNH • Epoch Composite Products, Lamar, MO • The Judy Company, Kansas City, MO • John Bowders and Hani Salim, MU Faculty • Tom Fennessey, MoDOT • MU Graduate students

  19. Calibration based on I435-Wornall Site

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