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Improving Design Methods for Slope Stabilization and Earth Retention Through Calibration

This study focuses on calibrating design methods for slopes and earth retention to optimize performance by utilizing available data effectively. The research aims to enhance predictability and safety of designs.

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Improving Design Methods for Slope Stabilization and Earth Retention Through Calibration

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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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