Current Research on Slope Stabilization with In-situ Reinforcement

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Presentation transcript:

Current Research on Slope Stabilization with In-situ Reinforcement J. Erik Loehr Department of Civil Engineering University of Missouri - Columbia

Ongoing Research Projects Slope Stabilization Using Recycled Plastic Pins Missouri Department of Transportation Epoch Composite Products The Judy Company Stabilization of Earth Slopes Using Reticulated In-situ Reinforcement National Science Foundation

In-situ Reinforcement of Slopes after Bruce and Jewell, 1986

Key Issues being investigated Limiting soil pressure Influence of member spacing Influence of member size Axial vs. lateral load transfer Influence of member orientation Effect on overall stability Group/network effects

Field Demonstration Sites Slope Angle General Characteristics I-435 (Wornall Rd.) 2.2:1 Zoned embankment I-435 (Holmes Rd.) 2.5:1 US 36 (Stewartsville) Zoned cut I-70 (Emma) Homogeneous fill US 54 (Fulton) 3.2:1 Homogeneous cut All surficial failures!!

I435-Wornall Rd Slide

I435-Wornall Rd. Site Layout

I435-Wornall Rd. Completed Installation

US36-Stewartsville Slide

US36 Stewartsville Site Layout

US36-Stewartsville Completed Installation

Large-scale Laboratory Modeling

Purpose of Large-scale Tilt Box Intermediate to full-scale field tests and centrifuge testing Will permit Rapid evaluation of alternative reinforcement scenarios and methods at near field scale Construction using “field-like” equipment Calibration of numerical models

Small-scale Tilt Device

Other Activities Back-analysis of case histories Numerical modeling Stability prediction contest

THANKS!