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Design and Construction Guidelines for Geosynthetic-Reinforced Soil Bridge Abutments with a Flexible Facing (2006) / Chapter Skim
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Pages 129-132

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From page 129...
... The major refinements and revisions to the NHI design method are as follows: • The allowable bearing pressure of a bridge sill on the load-bearing wall (the lower wall) of a GRS abutment is determined as a function of the friction angle of the fill, reinforcement vertical spacing, sill width, and sill type (isolated sill or integrated sill)
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From page 130...
... • It is recommended to extend the reinforcement lengths in both the upper and lower walls, at least the top three layers of each wall, to about 1.5 m beyond the end of the approach slab to promote integration of the abutment walls with the approach embankment and the load-bearing abutment, so as to eliminate the bridge "bumps" -- a chronic problem in many bridges. • Connection strength is not a design concern as long as the reinforcement spacing is kept not more than 0.2 m, the selected fill is compacted to meet the specification stipulated in the recommended construction guidelines, and the applied pressure does not exceed the recommended design pressures in the recommended design method.
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From page 131...
... 25–34. Grover, R.A., "Movements of Bridge Abutments and Settlements of Approach Slabs in Ohio." Transportation Research Record 678: Tolerable Movements of Bridge Foundations, Sand Drains, K-Test, Slopes, and Culverts, Transportation Research Board, National Research Council, Washington, D.C.
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From page 132...
... L., "Survey of Bridge Movements in the Western United States." Transportation Research Record 678: Tolerable Movements of Bridge Foundations, Sand Drains, K-Test, Slopes, and Culverts, Transportation Research Board, National Research Council, Washington, D.C.
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Key Terms

  • sill width
  • applied pressure
  • percent strain
  • allowable bearing
  • transportation research

  • isolated sill
  • design method
  • bearing pressure
  • research board
  • reinforcement spacing

  • integrated sill
  • friction angle
  • grs abutment
  • recommended design
  • bearing pressures

  • nhi manual
  • approaching roadway
  • sill settlement
  • facing blocks
  • foundation soil

  • bridge abutments
  • woven geotextile
  • reinforced soil
  • grs bridge
  • reinforcement length

  • contact pressure
  • bridge pier
  • bearing capacity
  • lateral movement
  • foundation level


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