Post on 18-Jan-2017
Gordon R. Keller, PE, GEGordon R. Keller, PE, GEGeotechnical EngineerGeotechnical Engineergrkeller@fs.fed.usgrkeller@fs.fed.us
ororgordonrkeller@gmail.comgordonrkeller@gmail.com
Slope StabilizationSlope Stabilization
Rural Roads Educational Webinar SeriesRural Roads Educational Webinar Series
Slopes and SlopeSlopes and Slope StabilizationStabilization
• Avoiding Unstable AreasAvoiding Unstable Areas• Preventing InstabilityPreventing Instability• Stabilizing SlidesStabilizing Slides
• Stabilization AlternativesStabilization Alternatives
Mike Long
Slide Recognition and Avoidance Slide Recognition and Avoidance
Slide PreventionSlide Prevention
Cut SlopesCut Slopes
Fill SlopesFill Slopes
Nearly Vertical CutsNearly Vertical Cuts
Slope Stabilization AlternativesSlope Stabilization Alternatives
Assessment of Risks Involved•Hazard, or Likelihood of Failure•Consequences of Failure/Values at Risk (Infrastructure and Environment)
Range of Management Options•Do Nothing or Adapting to Slide•Move Facilities, Protection Measures•Stabilization Measures
Stabilization Measures(What is adequate and cost-effective)
•Maintenance--Slide Removal•Use of Vegetation, Drainage•Slope Modification•Gabions, Small Walls, Buttresses•Reinforced Fills, Deep Patch Repairs•Designed Retaining Structures•Piles, Anchors, Soil Nails, Etc.
Use of Vegetation for Slide Prevention Use of Vegetation for Slide Prevention and Slope Stabilizationand Slope Stabilization
D. Gray
R. Sotir
Soil bioengineering Soil bioengineering andand
biotechnical slope biotechnical slope stabilizationstabilization
R. Sotir
J. McCullah
R. Sotir
Surface andSurface and subsurface subsurface
drainagedrainage
C. Gillies
Rock Cuts & Rock Fall Problems
CDOT
Flattening or reshaping over-steep Flattening or reshaping over-steep failing failing slopesslopes;
Fill Slope StabilizationFill Slope Stabilization
Placement of Waste Material
Bad Disposal Sites
OK Disposal AreasOK Disposal Areas
ReinforcedReinforced FillsFills
Deep PatchDeep Patch
Retaining WallRetaining Wall
MSE WallsMSE Walls(MechanicallyStabilized Earth)(MechanicallyStabilized Earth)
MSE WallsMSE Walls
Soil Nail LauncherSoil Nail Launcher
Bob Barrett
GRS Bridge AbutmentsGRS Bridge Abutments
FHWA GRS Integrated Abutment Design(Bowman Road Bridge, Defiance Co. Ohio)
-TRB SR 247- Landslides- Investigation and Mitigation
-USFS- Slope StabilityReference Guide
Walls Need Good Foundations!!Walls Need Good Foundations!!
Ed Rose
Ed Rose
SummarySummary• Use commonly stable cut and fill slope angles
• For failures, assess why a site failed
• Find the least expensive, effective stabilization measure
• Consider use of drainage and vegetation
• Use structures where necessary. Analyze and design significant structures!
• Place structures on a solid foundation
Gordon Keller, PE, GEGordon Keller, PE, GEGeotechnical EngineerGeotechnical Engineergrkeller@fs.fed.usgordonrkeller@gmail.com