drilling & geotechnical

PT. GEONUSA UTAMA

Erri Hendriawan
erri@geonusa.com
HP: +62 812 960 8187

Thrusted solution... for your peace of mind

SOIL NAILING

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

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

Suitable Application Media

Soil nailing 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