Soil nailing

Soil nailing

Soil nailing is a stabilization technique used to treat unstable natural soil slopes or as a construction technique that allows the safe over-steepening of new or existing soil slopes. The technique involves reinforcing the ground by passive inclusions, closely spaced, to create in-situ a coherent gravity structure and thereby to increase the overall shear strength of the in-situ soil and restrain its displacements. Often general reinforcing solid bars are installed into pre-drilled holes and then grouted into place using a separate grout line. Bars installed by drilling are fully grouted and installed at a slight downward inclination with bars installed at regularly spaced points across the slope face. A rigid facing or isolated soil nail head plates are used at the surface along with suitable holding mechanism.  Alternatively a flexible reinforcing mesh can be held against the soil face beneath the head plates.

Soiling nailing can be done for stabilization of railroad and highway cut slopes, tunnel portals, retaining structures for high-rise buildings, stabilization of steep cuttings or embankments, construction of bridge abutments and as temporary supports where scaffolding is bulky or expensive etc. Soil nailing can follow irregular curves and there is less impact on surrounding structures. The technique is flexible and can be easily modified. Equipment is portable and is able to be used in difficult or restricted access conditions.