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Gabion wall design

Gabion walls are usually identified as gravity retaining walls, which can resist the lateral earth pressure by means of their own weight. Generally speaking, gabion wall design should comply with the following principles.

To start with, the gabion walls design has something to do with the selection of trail dimensions for a typical vertical cross section through the wall. Then you have to determine the applied force on the wall. Make sure that the resisting moment exceeds the overturning moment by a suitable safety factor. The sliding resistance should exceed the active horizontal force. Finally, you have to ensure that the resultant force falls within the middle-third of the wall’s base, and at the same time the maximum bearing pressure is within the allowable limit. The above principles are extremely important for gabion wall design, so the preparation work has to be taken seriously so as to meet all the required criteria. Moreover, the wall stability must be checked at the base and at each course.

The width of the base must be at least half the total height of the wall. For example, if the wall is 3 meters high, the width of the base should be 1.5 meters wide. When determining the height of the gabion wall, you should leave additional 0.5m, as it is the standard of BS 8002, which stipulates that the gabion wall should ideally be embedded by 0.5m. Gabion wall design complies with stretcher bond. On the selection of filling materials, a Class 6G gabion stone is suggested, which is ideally 100mm-150mm hard durable stone. For economical considerations, 1.7 tonnes per m3 is suitable. In terms of the foundation, the most desirable for a gabion wall is 150mmm of well-compacted granular material. Concrete foundations are also available but not usually required. In the angle of design, the backfill is a critical element as well.          

In accordance with different loading and terrains, the designs will vary significantly. Before you start to build the gabion walls, you have to check carefully the gabion wall design. It is suggested that the design should be verified by a qualified engineer.

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