Soil nailing is a construction technique used as a remedial measure which fix the unstable natural soil slopes or allows the safe over-steepening of the soil slopes. This technique inserts relatively slender reinforcing elements into the slope (reinforcing bars (rebar) or hollow-system bars). Solid bars are installed into pre-drilled holes and hollow bars are drilled and grouted simultaneously by pumping grout down.  The images are showing visually how these soil nails works and the benefit of them is huge for safeness, stability and functionality of terrains that are sloppy and unsafe otherwise.

...