DYWI® Drill Hollow Bar System
DYWI® Drill Hollow Bar soil nails are ideal for loose or collapsing soils, as they can be installed without the need for a casing. The system is used for mixed fills, granular material and loose overburden. The DYWI® Drill hollow bar system allows drilling and grouting to be combined as a single operation and complies fully with EN 14490 (European standard for soil nails).
Soil nails are typically classified as lightly loaded (30-150 kN), passive installations. The fully bonded feature enables the loose wedge at the surface to be tied into the deeper stable zone. Soil nails are normally regarded as low risk installations, with an element of redundancy existing in the stabilized face. The design of soil nailed faces should incorporate a diamond grid layout to ensure efficient distribution of the reinforcement. Suitable drainage must be incorporated within the nailed face to prevent build up of water within the slope. Water ingress can negate the effects of the soil nails by increasing the bulk weight of the soil, decrease the internal angle of friction and may cause a slope failure.