Gabion Basket Retaining Walls
Gabion basket retaining walls are a gravity type retaining wall that uses stone filled wire baskets. They are very similar to our concrete block design but can be more economical.
The gabion basket allow water to escape if large stone is used to fill the baskets. If not back drainage may be required to stop any build up of hydrostatic pressure building up behind the wall that can cause failure.
A number of materials can be used to construct Gabion basket retaining walls. The selection of the material is dependent on the budget and design life span of the wall.
Gabion Basket Details
The selection of the gabion basket sizes will depend upon the design of the wall. A number of block sizes may be used to achieve the most effect design.
The selection of the wire thickness and type will depend on the design life and location of the wall. For example a coastal location will require a heavy gauge of wire.
Gabion retaining walls are inclined at 6 degrees from the vertical to improve stability, with the correct specification the inclination can be increased normally to a maximum of 10 degrees which can provide cost savings in design. Care should be taken in designing vertical walls because of their flexible nature.
Gabion Basket Installation
Gabions are to be installed in accordance with the manufactures instructions. All gabion panel intersections are to be laced with wire matching the gabion mesh.
Internal bracing wires are to be provided to exposed faces. Wire to match gabion mesh. Wire to be provided at 1/3 and 2/3 gabion height for 1.0m high gabions and 1/2 height for 0.5m high gabions.
Gabion infill stone to be hard and durable, 150mm nominal size but not less than 100mm and not greater than 200mm.
Gabion infill stone to be angular and placed flat to minimise voids and provide a dense, stable mass. Gabion stone to be handpicked after placing by machine. Stones to the front of the basket to be selected and placed to provide a neat finish.
The formation to the base of the gabion wall is to be proof rolled with a deadweight roller weight of 2 tonnes to identify and soft spots. Soft spots are to be excavated and filled with type 1 granular sub-base material and compacted in layers of 150mm.
Backfill material to comprise of well graded granular material max particle size 40mm. The compaction plant used within a 2m distance from the rear of the wall and to have a deadweight not greater than 1000kg
For installations where groundwater seepage is encountered from retained solid, a geotextile filter membrane such as Terram T1000 is to be used to the rear of the wall.
Gabion Basket Retaining Wall Images
Compare Prices of Retaining Wall Types
Which retaining wall type is the most economical to build? We have written an article on retaining wall price comparisons. The article details the types of retaining wall and gives you a price of each type for comparison.
Retaining Wall Design Service
The design of a retaining wall requires knowledge of the retaining material, the water table, the ground bearing capacity and any site constraints. The design requires a ground investigation and a structural engineer to ensure the design is fit for purpose.
We offer a full design service from carrying out the ground investigation to final working drawings.
Other Retaining Wall Types
- King Post Retaining Walls
- L Shape Precast Concrete Retaining Walls
- Reinforced Masonry Retaining Walls
- Reinforced Block Retaining Wall
- Inclined Retaining Walls
- Masonry Retaining Walls
- Criblock Retaining Walls
- Flood Defence Retaining Walls
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