What Is a Gabion?
A gabion is a wire mesh cage or basket filled with rock, stone, or other durable material. Gabions are used extensively in civil engineering and landscape construction for retaining walls, erosion control, channel lining, and slope stabilisation. Their flexibility, permeability, and ability to conform to ground movement make them a versatile and cost-effective solution for a wide range of geotechnical challenges.
How Do Gabions Work?
Gabions function as mass gravity structures. The combined weight of the stone fill within the wire mesh resists lateral earth pressures, hydraulic forces, and slope instability. Because the mesh allows water to pass through freely, gabion structures do not build up hydrostatic pressure behind them — a significant advantage over impermeable retaining wall types.
Over time, sediment and vegetation naturally fill the voids between the stones, further strengthening the structure and helping it blend into the surrounding landscape.
Types of Gabion
Gabion baskets are the most common form: rectangular wire mesh cages typically 1–2 metres long, stacked and wired together to form walls or revetments. Gabion mattresses (also called Reno mattresses) are thinner, wider units used for channel bed and bank protection, scour prevention, and erosion control on slopes. Gabion sacks are cylindrical mesh tubes used for emergency works or underwater placement where speed is essential.
Common Applications
Gabions are used across infrastructure, environmental, and landscaping projects. Typical applications include retaining walls along roads, railways, and embankments, riverbank and coastal erosion protection, bridge abutment protection and scour prevention, noise barrier walls, and architectural and landscape features.
Advantages of Gabion Structures
Gabion structures offer several advantages over rigid alternatives. They are permeable, eliminating the need for separate drainage systems. They are flexible, tolerating differential settlement without cracking. They are environmentally adaptable, supporting vegetation growth. They are durable, with design lives exceeding 60–80 years when specified with the correct wire coating. And they are economical, using locally sourced fill material wherever possible.