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Chapter 2
Helical Foundation Systems
CHAPTER 2
HELICAL FOUNDATION SYSTEMS
2.9.2 Design Considerations
Helical soil nails are passive bearing elements
which rely on movement of the soil mass to
mobilize the soil shear strength along the nail. As
a result, soil nail walls typically experience more
lateral movement than tieback walls of similar
height. By allowing this movement, the highest
stress in the soil nail is near the failure plane,
centered between the opposing tensile forces.
Conversely, the highest stress in a tieback is at the
wall face. Therefore, soil nails have less nail head
Figure 2.9.1.a
Typical soil nail
wall installation sequence
