Soil Nail Wall

A soil nail wall is a stabilization method of reinforcing existing soil by installing hollow bars or threaded steel bars into slopes or cuts as wall construction proceeds from top down. Grouted bars are installed to create a stable mass of earth, first step in building a solid wall. The nailing process creates a single block of earth able to hold-back its overburden. Soil nailing is an economical means of creating shoring systems and retaining walls. Often, nailing is less disruptive than other means of constructing retaining systems.

Soil nail wall construction includes the following major steps:
(1) Excavation;
(2) Drilling of nail holes;
(3) A) Nail installation and grouting ;
B) Installation of strip drain;
(4) Construction of initial shotcrete facing;
(5) Construction of subsequent levels (Repeat Steps 1-4);
(6) Construction of final facing.

Soil nail walls are particularly well suited to excavation applications for ground conditions that require vertical or near-vertical cuts and have been shown to be particularly well suited in the following temporary or permanent applications:
· Roadway cut excavations
· Road widening under an existing bridge end
· Tunnel portals
· Hybrid soil nail systems
· Repair and reconstruction of existing retaining structures
· Temporary or permanent excavations in an urban environment

Soil nail wall advantages:
· Can follow irregular curves
· Portability for tight spaces
· Flexible, easily modified techniques
· Installation of soil nail walls is fast and cost-effective
· Less noise and traffic obstructions
· Minimal impact on nearby properties
· Minimum shoring space required