J. Erik Loehr Civil and Environmental Engineering

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Presentation transcript:

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 Would like to make prudent use of performance data to improve design methods

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

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

I435-Wornall Road Site June 2001

I435-Wornall Road “As-Built”

I435-Wornall Site Instrumentation

I435-Wornall Site: Piezometric Levels

I435 Site Piezometric Levels

Theoretical Factors of Safety

I435-Wornall Road Performance

Field Performance Function

Field Performance Functions

Theoretical Factors of Safety

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

Large-scale modeling

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

Calibration based on I435-Wornall Site