What Is a Soil Nailing Wall Design?
Soil nailing (the passive steel bars grouted into the slope, the shotcrete facing) stabilizes the cut as the excavation proceeds — the top-down (the lift-by-lift; the nails installed from the bench). The design: the nail's pullout (the grout-ground bond), the facing (the shotcrete — the flexure), and the global stability (the slip surfaces — the nails' crossing). The excavation's top-down retention.
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How nailing works
The top-down (the 3-6 foot lifts — the cut; the nails — the drilled and the grouted; the facing — the shotcrete; the repeat), the passive (the nails — the unstressed; the movement — the mobilizing), and the composite (the reinforced — the soil mass; the gravity — the block).
Design
The pullout (the bond — the grout's; the verification — the test nails), the facing (the shotcrete — the 4-8 inch; the flexure — the nail heads'), the global (the limit equilibrium — the surfaces; the factor of safety), and the corrosion (the encapsulation — the permanent; the epoxy — the bars). FHWA's soil nail manual — the standard.
Vs. the alternatives
The tiebacks (the prestressed — the bottom-up; the nailing's — the top-down), the soldier piles (the discrete — the nailing's — the continuous), and the limits (the groundwater — the drainage; the soft — the creep; the ROW — the easements). The nailing is the cut's — the economical top-down.
The bottom line
Design soil nail walls per FHWA (passive grouted bars, shotcrete facing, verified pullout, corrosion protection) — top-down excavation support; provide drainage and nail easements.
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