Soil Screw Design Manual
A soil nail wall is a gravity composite soil structure in which an excavated slope or vertical cut is internally reinforced through placement of closely spaced linear reinforcing elements. Reinforcing elements are installed by placing them into the existing soil slope or new excavation.
Construction is performed in vertical steps, with construction starting at the top of the excavation and proceeding down (Figure 1.2.1). Once an excavated level is reinforced with soil nails, a permanent or temporary facing is applied to retain the soil.
The resulting soil structure has soil nails placed to a depth and of a sufficient density to ensure it can resist the forces imposed by the soil and surcharge loads. The failure modes that are analyzed to insure stability for a soil nail wall include sliding, bearing, and global stability failure modes
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