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J. Erik Loehr Civil and Environmental Engineering

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Presentation on theme: "J. Erik Loehr Civil and Environmental Engineering"— Presentation transcript:

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 CMS 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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