Soil Nailing
Soil nailing is earth retention technique using grouted tension-resisting steel elements (nails). The walls are generally constructed from the top down. Typically, 3 to 6 feet of soil is excavated from the top of the planned excavation. Near-horizontal holes are drilled into the exposed face at typically 3 to 6 foot centers. Tension-resisting steel bars are inserted into the holes and grouted. A drainage system is installed on the exposed face, followed by the application of reinforced shotcrete facing. Precast face panels have also been used instead of shotcrete. Bearing plates are then fixed to the heads of the soil nails. The soil at the base of this first stage is then removed to a depth of about 3 to 6 feet. The installation process is repeated until the design wall depth is reached. The finished soil nails result in a zone of reinforced ground. The technique has been used to stabilize slopes, excavations, deep cuts, and existing retaining walls.
This technique is available in most areas through either Hayward Baker or sister Keller companies. Contact your local Hayward Baker office for more information.