soil nail walls: theory, application, & recent...
TRANSCRIPT
SOIL NAIL WALLS: THEORY, APPLICATION, & RECENT PROJECTS
Stephen M. Revell, P.E.ALDOT Bureau of Materials & Tests - Geotechnical
OUTLINE
• Advantages & Disadvantages
• Typical Construction Sequence
• Potential Transportation Applications
• Feasible Ground Conditions
• Basic Design Theory and Philosophy
• Overview of Recent ALDOT Projects
Advantages & Disadvantages
Advantages
Top Down Construction Saves ROW Minimizes Footprint Permanently
Stabilized Rapid Construction
Time
Disadvantages
$$ Cost * Experience
Transportation Applications
• Excavation shoring (building construction)
• Roadway widening/additional lanes• Limited or expensive Right-of-Way• Minimize environmental impacts within the transportation corridor
• Landslide Repair
Feasible Ground Conditions
• Applicable over a wide range of soil types and ground conditions
• Need stable excavation face for 1-2 days
• Sands, clays, & mixed soils with marginal strength and some apparent cohesion (N > 9, c > 100psf)
• Not feasible in dry, clean, sands or where seepage may be a problem
US-431 Landslide near Pittsview, AL.
Summer-Fall 2013
I-22 Landslide near Hamilton, AL.Fall 2013-Spring 2014
Birmingham Northern BeltlineSummer 2014 -
Additional Information
• FHWA Geotechnical Engineering Circular No. 7 (GEC-7)Publication No. FHWA-IF-03-017
• ALDOT Section 570, Soil Nail Retaining Wall
QUESTIONS?
