Soil nailing consists of the passive reinforcement of existing ground sign now


Soil nailing consists of the passive reinforcement (i.e., no post-tensioning) of existing ground by installing closely spaced steel bars (i.e., nails), which are subsequently encased in grout. As construction proceeds from the top to the bottom, shotcrete or concrete is also applied on the excavation face to provide continuity. Soil nailing is typically used to stabilize existing slopes or excavations where top-to-bottom construction is advanatageous compared to other retaining wall systems. For certain conditions, soil nailing offers a viable alternative from the viewpoint of technical feasibility, construction costs, and construction duration when compared to ground anchor walls, which is another popular top down retaining system. While the terms "soil nail wall" and "soil nailing" are broadly applied to soil systems, the technique is also applicable to excavations in soil-like materials (e.g., soft rock or weathered rock).

Soil Nailing is a slope stabilization technique that involves the installation of an array of several closely spaced earth anchors, which, via grout-to-earth friction, work together in tension and bending resistance to "knit" the slope's soil together, consequently creating a self-supporting earth mass. Most soil nailing schemes include slope facing treatments anchored in place by the heads of the individual soil nails. The most common application of soil nailing in Geo-Foundations' market is for stabilizing slopes that are inaccessible to large conventional pile driving or drilled shaft boring equipment. In all cases, soil nailing preserves the slope's existing soils without large cuts and fills - this aspect is particularly advantageous when the slope being treated is vegetated with mature growth that can, by conscientious design and installation considerations, be preserved intact.

 

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 100 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 with some form of bio-treatment like seed-impregnated coconut husk matting or mulch cover with hydro-seeding.

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