Slope Stabilization Techniques for Rural Roads
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Slope Stabilization Techniques for Rural Roads
- 1. Gordon R. Keller, PE, GEGordon R. Keller, PE, GE Geotechnical EngineerGeotechnical Engineer grkeller@fs.fed.usgrkeller@fs.fed.us oror gordonrkeller@gmail.comgordonrkeller@gmail.com Slope StabilizationSlope Stabilization Rural Roads Educational Webinar SeriesRural Roads Educational Webinar Series
- 2. Slopes and SlopeSlopes and Slope StabilizationStabilization • Avoiding Unstable AreasAvoiding Unstable Areas • Preventing InstabilityPreventing Instability • Stabilizing SlidesStabilizing Slides • Stabilization AlternativesStabilization Alternatives
- 7. Mike Long
- 9. Slide Recognition and AvoidanceSlide Recognition and Avoidance
- 22. Nearly Vertical CutsNearly Vertical Cuts
- 25. Slope Stabilization AlternativesSlope Stabilization Alternatives
- 26. 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
- 27. 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.
- 29. Use of Vegetation for Slide PreventionUse of Vegetation for Slide Prevention and Slope Stabilizationand Slope Stabilization
- 31. D. Gray R. Sotir
- 32. Soil bioengineeringSoil bioengineering andand biotechnical slopebiotechnical slope stabilizationstabilization R. Sotir
- 38. C. Gillies
- 39. Rock Cuts & Rock Fall Problems CDOT
- 42. Flattening or reshaping over-steepFlattening or reshaping over-steep failingfailing slopesslopes;
- 45. Fill Slope StabilizationFill Slope Stabilization
- 54. OK Disposal AreasOK Disposal Areas
- 71. MSE WallsMSE Walls (MechanicallyStabilized Earth)(MechanicallyStabilized Earth)
- 79. Soil Nail LauncherSoil Nail Launcher Bob Barrett
- 80. GRS Bridge AbutmentsGRS Bridge Abutments
- 82. FHWA GRS Integrated Abutment Design (Bowman Road Bridge, Defiance Co. Ohio)
- 85. -TRB SR 247- Landslides- Investigation and Mitigation -USFS- Slope Stability Reference Guide
- 86. Walls Need Good Foundations!!Walls Need Good Foundations!!
- 87. Ed Rose
- 88. Ed Rose
- 89. 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
- 91. Gordon Keller, PE, GEGordon Keller, PE, GE Geotechnical EngineerGeotechnical Engineer grkeller@fs.fed.usgrkeller@fs.fed.us gordonrkeller@gmail.comgordonrkeller@gmail.com
Notas del editor
- Large earth movement Potential solutions: Do nothing, minimize road standard and live with slide too big to stabilize cost effectively Lower grade Abandon and relocate
- Depending on the geology one could also consider a compound cut, a steeper cut in the more competent material (rock) and a flatter slope is the less competent (soil)
- Suggested cutslope ratios
- Rock buttress at toe on FHWA project on Tahoe National Forest
- Erosion of cut slopes can be greatly mitigated by the use of vegetation, here using grass, works quite well on 3 meters (9 feet) or less near vertical cuts
- Can also provide a wider catchment area w/o fencing
- Missed a spring during construction, did not account for ground water. What are possible alternatives to resolve fill slope failures. The first, if you can, is to realign the road “shift the alignment” into the cutslope. Here the new centerline would be in the present ditch shifting the downhill edge of roadway off the failed material into stable material. The cutslope and alignment would have to be modified.
- Last few noted about fills, dumping of waste
- This earlier sliver fill photo
- Small retaining wall. Posts driven into stable material a few feet, support the horizontal members. This project in Vicforests, Australia
- Photo of timber facing and using geogrid as reinforcement and showing backfill material. Backfill can be native, need to design for the planned backfill material if it is dry enough to be properly compacted.
- Here is a welded wire wall using the welded wire to “retain” the backfill but also used as the face of the wall
- Using geogrids as the reinforcing mats Gravity structure important to have firm foundation and base typically 70% of wall height
- Or tires, this a tire faced wall again with geogrid reinforcing elements as tie-backs
- Other fill-slope repair options Soil nails 10 to 20’ in length shot into the surface, spaced 3 to 5’ centers
- Typical retining wall problems: Nedd a firm foundation, especially gravity type structures Inadequate foundation, here due to scour