What Is Soil Nailing vs. Tiebacks?
Both (the retained — the excavation's; the FHWA's) stabilize (the soil's — the 30-foot; the cut) — the nailing (the passive — the grouted; the 20-foot) reinforces (the soil's — the 1-2 inch; the shotcrete), while the tiebacks (the active — the stressed; the 50-foot) anchor (the wall's — the 100-kip; the bonded). The nailing's — the passive soil; the tieback's — the active anchor.
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Soil nailing
The passive (the grouted's — the 20-foot; the #8's — the bars), the 1-2 inch (the shotcrete's — the facing; the 4,000 psi's), the 20-foot (the length's — the 0.7H's; the 30's — the max), the 1.5 (the FS's — the global; the 1.35's — the pullout), and the FHWA (the manual's — the 2003's; the 2015's — the GEC 7's).
Tiebacks
The active (the stressed's — the 100-kip; the 50-foot), the bonded (the 20-foot's — the grout's; the 10's — the unbonded), the 100-kip (the lock-off's — the 80%'s; the design), the 1.67 (the FS's — the pullout; the 2.0's — the creep), the PTI (the 2014's — the 5th; the tested — the 133%), and the 50-foot (the length's — the 1.0H's; the 100's — the max).
Selection
The nailing's (the 30-foot's — the max; the 1:1's — the cut), the tieback's (the 100-foot's — the deep; the 0's — the easement), the $50-$100 (the sq ft's — the nailed; the $100-200's — the tied), the 1.5/1.67 (the FS's — the global/pullout; the 2.0's — the creep's), and the 2015/2014 (the FHWA/PTI's — the manuals'). The nailing reinforces — the tieback anchors.
The bottom line
Choose soil nailing (passive #8 grouted bars at 0.7H length, 1-2-in shotcrete, $50-$100/sq ft, FHWA GEC 7) for cuts ≤30 ft and tiebacks (active 100-kip stressed anchors, PTI 133% testing, $100-$200/sq ft) for deep excavations — verify easements for tieback zones.
Torch Engineering PLLC · (480) 490-0064 · info@torchengineering.com — PE stamping backed by Apex Grid Engineering.