.

soil nails are effective as temporary or permanent geostructural solutions

Designed to be installed horizontally or at a slight angle (20-25°), provide reinforcement for earth retention structures within excavations and on slopes in top-down construction. Installed into a drilled hole and used in combination with plate washers and shotcrete, soil nails are effective as temporary or permanent geostructural solutions.

Soil Nailing Applications

  • Temporary and permanent excavation support/retaining walls
  • Stabilization of tunnel portals
  • Stabilization of slopes
  • Repair of retaining walls

    Types of Facing

    The type of facing depends on application and soil type. Current facings include:
  • Shotcrete, generally reinforced with either o Welded wire mesh o Rebar o Steel or polyester fibers
  • Prefabricated concrete or steel panels

    Corrosion Protection

    Corrosion protection is necessary for long-term temporary and/or permanent works
  • Epoxy Coatings
  • Polyethylene Sheathing

    Soil Nailing Design Steps

    1. Perform geotechnical site investigation
    2. Evaluate excavation/nailed wall geometry
    3. Check wall stability - internal/external
    4. Incorporate drainage control system with nail wall design
    5. Finalize nailing layout and work sequence

    Suitable Application Media

    is possible in a wide range of materials including:
  • Clays
  • Sandy soils
  • Weathered rock; tallus slope deposits
  • Heterogeneous and stratified soils

    Soil nailing is not practical in:

  • Soft, plastic clays
  • Organics/Peat
  • Loose (N less than 10), low density and/or saturated soils
  • Fills (rubble, cinder, ash, etc.)

    Soil Nailing Drainage Systems

    Drainage systems are incorporated into the nailed wall, reducing liquid pressure and preventing saturation of the reinforced ground. Drainage systems include:
  • Geotextile facing : Drilled in place relief wells
  • Slotted plastic collection piping Surface drainage control above and behind the retaining wall is also critical to the system.

    Soil Nailing Quality Control

  • Nailing installation sequence o Verification testing - pull test to verify design strengths o Progressive monitoring for design performance
  • Conventional movement monitoring o Inclinometers o Optical survey of fixed targets o Shotcrete : Thickness, Strength



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