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TDOT Rockfall Management System

TDOT Rockfall Management System. Saieb Haddad Geotechnical Engineer Geotechnical Engineering Section Tennessee Department of Transportation. Old Approach: Falling Rock signs . History/Background. Most of the “Easy” routes have been developed.

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TDOT Rockfall Management System

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  1. TDOT Rockfall ManagementSystem Saieb Haddad Geotechnical Engineer Geotechnical Engineering Section Tennessee Department of Transportation

  2. Old Approach: Falling Rock signs

  3. History/Background • Most of the “Easy” routes have been developed. • Meanwhile, the previously lightly traveled, more challenging routes have seen increased traffic. • In addition, weathering of rock slopes along existing routes continues…

  4. New Approach: • Develop a systematic method of identifying and repairing problem slopes.

  5. Tennessee RMSDeveloped as a collaboration between TDOT, the University of Tennessee, and Virginia Tech

  6. Research Project Goals • Identify Hazardous Sites • Develop a Rockfall Hazard Rating System • Statewide Coverage of TDOT Roadways • Ability to prioritize remediation • Inclusion of photos • Database and GIS System

  7. Hazard Rating Components • Slope height • Ditch effectiveness • Average Vehicle Risk (AVR) • Roadway Width • Decision Site Distance (%DSD) • Geologic characteristics (Structural/weathering modes) • Block size/volume per event • Presence of water on slope • Rockfall history

  8. Rockfall Hazard Management System Training Manual

  9. Rockfall Hazard Rating System

  10. Preliminary Ratings: A – High Hazard B – Moderate Hazard C - Low Hazard

  11. Failure Modes • Planar Sliding • Wedge Sliding • Toppling • Differential Weathering • Raveling

  12. Planar Sliding

  13. Wedge Sliding

  14. Toppling

  15. Differential Weathering

  16. Raveling

  17. RMS WebMap Application

  18. There are just under 2000 A and B SitesApproximately 49% are A Sites

  19. Remedial MeasuresOften used in combination • Removal – Blasting, scaling, trimming • Restraint – High capacity anchors, rock bolts, anchored wire mesh, retaining walls • Containment – High energy fencing • Control – Draped wire mesh • Widening of ditch/catchment area

  20. RemovalBlasting

  21. RestraintHigh Capacity Anchors

  22. RestraintBolts/Dowels

  23. Pile and Lagging WallRock Socket Drilling

  24. RestraintPile & Lagging Wall

  25. Pile and Lagging WallLagging in Place

  26. ContainmentHigh Energy Fencing

  27. ControlWire Mesh Drape

  28. Catchment Area/Ditch Improvement

  29. Challenges • Developing/selecting the most cost-effective remedial measures (maintaining traffic is a critical factor). • Producing construction plans/contract documents • Funding • Keeping database up-to-date

  30. Civil Engineers, Infrastructure, Highways, and Public Safety • Highway Engineers traditionally have needed a working knowledge of route geometry/surveying, construction methods, structural design, hydraulics, hydrology, soils and materials.

  31. Field datacollection Data synchronization Return to office or laptop QA/QC Database & GIS interface

  32. Technical Response

  33. Rock Fall/Rock Slide reported to the Geotechnical Staff

  34. Site inspection. • Stability assessment. • Highway closure or maintain partial traffic (important decision). • Geotechnical Investigation and Analyses.(could include drilling and testing). • Perform repair design and contract document/ emergency contract.

  35. Contractors Prequalification

  36. Award Contract Start Construction

  37. Skilled labor

  38. Roadway closed due to traffic safety and work space.

  39. The end

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