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Nailed wall
A soil nailed retaining structure stabilizes and reinforces the soil mass in situ. The technique consists of inserting and grouting - usually subhorizontally - closely spaced slender steel reinforcing bars or “nails” typically anchored in a steel grid reinforced shotcrete facing applied on the excavation front in order to provide continuity in support. Soil nail walls are relatively flexible, suitable only for excavation above groundwater.
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Construction sequence
Fields of application
• Soil reinforcement, construction of earth retention support systems
• Suitable for confined areas with difficult and restricted access
• Underpinning and stabilization
• Realization of high and/or steep cuttings to maximise development space
• Not usable in soils without short-term cohesion because soil nail walls require soil (slope, excavation) deformation to efficiently mobilize the soil nail forces
Environmental impact
• Vibration-free
• Soil removal
• Limited to working areas without presence of groundwater table during the excavation
• Protection of the immediate surroundings when projecting shotcrete (buildings, compounds, …)
• A stable, dry and flat work platform is needed
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