Soil Nailing is a slope stabilization technique that involves the installation of an array of several closely spaced earth anchors
Soil Nailing is a practical and proven technique used in constructing excavations and stabilising slopes by reinforcing the ground insitu with relatively small, fully bonded inclusions, usually steel bars. These are introduced into the soil mass, the face of which has been locally stabilised by sprayed concrete, and act to produce a zone of reinforced ground. This zone then performs as a homogeneous and resistant unit to support the unreinforced ground behind, in a manner similar to a conventional gravity a retaining wall.
Soil nails themselves are drilled and grouted soil anchors, consisting of a single steel (or, in rare cases, fibreglass) bar tendon - typically 25 mm to 45 mm diameter continuously threaded bar - encapsulated in a cement grout body with typical nominal diameter of 40 mm to 150 mm. By far the most common tendon / installation technique combination is hollow bar continuous grout flush. Soil nail heads usually consist of a steel plate fixed in place against the slope surface by a nut threaded onto the soil nail tendon. Slope facing treatment, when used, can consist of some manner of meshing - steel or synthetic - in combination .