Soil Nailing
In this technique to install closely spaced, passive structural inclusions to stabilize existing unstable ground due to change of geotechnical conditions
The installation procedure involves drilling a hole in the ground,placing a steel bar in the hole and grouting the hole
Soil nails can be installed on existing or cut slopes and walls during excavation
Types of soil nails:
- Grouted nails
- Self-drilling nails
- Jet grouted nails
- Helical nails
- Driven nails
- Shoot-in nails
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| soil nail |
Soil nails
- Mostly nails are installed at inclination angles 10 − 20 Degree below horizontal
- The main difference from ground anchors is that soil nails are not prestressed when they are installed
- Tension develops during the service due to ground movements
- Typical temporary facing is installed by steel mesh with shotcreting(spraying concrete)
- Cast-in-place, prefabricated concrete facing, or other type of facing may be installed as the permanent wall facing in front of temporary wall facing
- Soil nailing can be used in cohesive soils. In case of granular soils, the minimum cohesion component of 7.5 kPa is suggested to be essential for soil nailing to be used.
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