Anchored earth

A further type of earth retaining wall structure was evolved by Murray and Irwin (1981). The system involves the use of metal rods, generally of mild steel, which are placed horizontally within the fill at vertical and horizontal spacings of about 0.6 m or more. The rods, typically 16-20 mm in diameter, have one end formed into a Z or triangular shape which acts as an anchor while the other end has a screwed connection to the facing panel (Fig. 7.19). So far the facing units used have been made from precast concrete and are about 1 m2 or larger in area.

Fig. 7.19 Anchored earth.

An advantage is that, because round bars are used, the surface area liable to corrosion is minimised and, further, because of the round section, the bars can be easily given two or three coats of a suitable protective material if it is considered that corrosion is likely to be a problem.

It must be appreciated that anchored earth acts in an entirely different manner from reinforced soil. The round bars used rely upon the anchors at their ends to hold them within the soil fill. These anchors can only develop penetration resistance after there has been some deformation within the soil and their design is a major factor in determining the efficiency of the system.

Chapter 8


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