What are Gabions?

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You&#;ve probably seen plenty of gabions before, but not realized what these nifty structures were.

By definition, a gabion is a welded wire cage or box that&#;s filled with materials like concrete, stone, sand or soil. With the earliest gabions coming into existence around years ago, these tried and tested cages have been used for everything from military forts to geographical control.

What are the advantages of gabions?

There are many advantages to using gabion baskets which we&#;ve briefly discussed below! Aside from the main advantage (their affordable price point!) the reason below are other notable advantages to using gabions in gardening and landscaping, etc.

The first major advantage point of gabions, is their ease of handling and how easy they are to transport. Because gabions are usually transported as &#;separate parts&#; you can transport them in different journeys &#; and assemble them at the desired location.

Another big reason why gabions are so popular, is the speed of construction and how quickly they can be erected. This gives construction companies flexibility, and also means projects can be completed quickly and promptly.

Some of the finaly advantages of gabions we&#;ll discuss here are the flexibility gabions offer for movement and location-changes, and also their permeability to water (gabions offer really good good drainage in wet weather).

What are the disadvantages of gabions?

Though there are many advantages to installing gabions, some have criticized them as being unsightly or unattractive. Though this is entirely down to personal preference, gabions may not suit the aesthetic that you are after for your landscaping venture. 

In addition to this, the wire baskets that are used for these gabions may make them more subject to abrasive damage should they be in areas of high velocity flow. If gabions are being used to retain large volumes of water, they may not be the most economical choice. In this vain, should you be wishing to cut corners financially, they may not be the best choice. As they are more expensive than vegetated slopes or alternative methods of retention, they may not be the best option for your project. 

Are gabions cheap?

Gabions can certainly be cost-effective if well-planned. If you are not creating giant structures, they are a long-wearing solution to numerous landscaping problems. However, depending on how much steel and filler material you need to source, they can become expensive. 

In addition to this, it&#;s possible that you may need to employ professional help to construct your gabion. Therefore, it&#;s certainly worth weighing up the long-term costs and benefits to gabions, as it really does depend on your individual project needs. 

What size gabion do I need?

In general, a 3mm wire gabion basket is the standard thickness for gabions up to 3m in height. For architectural projects, 4mm cladding should be used to give the best possible look. Gabions can be cut on site to achieve your required dimensions, and depending on your project, the size that you may require could vary. As manufacturers create gabion baskets of numerous sizes, the minimum size tends to be twelve inches, so be sure to take accurate measurements to determine the size you require.

If you&#;re creating mini gabions for decorative use, you may only need 300x300x300mm mini gabions. However, if you&#;re looking for erosion protection for riverbeds, you may need large 2m x 3m x 0.5m gabion mattresses. 

What do you fill a gabion with?

Traditionally, gabions are filled with readily available stone and rubble. As time has gone on, gabions have allowed more carefully selected fillings to become available. Though stones or rocks tend to be the most popular filler material, the choice of which material is best suited depends on the intended purpose of the finished construction. If you wish to create a look akin to traditional walls, you may wish to fill your gabion with identical stones laid flat to create a tight-knit appearance.

Fillings for gabions are not strict by any means, but sturdy, supportive materials should be at the top of the list for a successful, hardy structure. 

What is the purpose of a gabion?

Playing important roles in gardening, construction and the prevention of erosion, gabions are usually used for retention or environmental control. Often used to protect slopes and streambanks from the natural effects of flowing water, gabions help to bolster river channels and divert flow away from weaker, eroding channel areas.

In more domestic settings, gabions can be used as retaining walls or aesthetic pieces. Artistic gabions can be displayed to accent outdoor spaces or used to pocket plant life. Other domestic uses include seating walls and encasing fireplaces. 

Overall, they&#;re truly multi-faceted structures that offer great peace of mind.

The Science of Gabions Towards Erosion Control

Soil erosion is a prevalent problem in both rural and urban areas. If left uncontrolled, it could lead to loss of topsoil, which is vital for planting and vegetation growth. One of the most effective ways of controlling soil erosion is using gabion walls.

What are Gabion walls?

Gabion walls are box-shaped wire baskets made from a hexagonal mesh of galvanized steel wire. The &#;boxes&#; are filled with durable rock fragments and stacked on top of one another to form a gravity wall.

Gabion walls depend primarily on the rock fragments' compactness to maintain internal stability and their weight to resist hydraulic and earth forces.

What are they used for?

Gabion walls are mainly constructed to gently slow down the speed of run-off while sieving the soil it carries. They are also used to alleviate seepage problems on slopes. This mainly occurs on loose soils. They can also be used in areas with water-soil problems, where the land conditions, water velocity, water turbulence, and expected vegetative cover are set in a way that may erode the soil in the design flow conditions.

Gabions also play a pivotal role in road construction. In road construction, gabion walls stabilize the road, mainly when the road is being constructed on a slope.

History of Gabions

Gabion walls date back to years ago when the Egyptians used them to control flood waters from the river Nile. They wove gabion baskets using reeds, filled them up with small rocks, and arranged them along the Nile. The result was a significant decline in the river's erosion and the prevention of run-off flood water that destroyed their crops during the rainy season.

Military use

In medieval times, gabions were used as an inverted trench that protected soldiers from enemy fire. This method was also used during the American Civil War. These early gabion designs had open tops and bottoms. They were made from wickerwork and filled with earth to act as military fortifications.

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These gabion walls were used to protect siege artillery gunners and scrappers. The wickerwork cylinders were relatively light and could be carried easily along the ammunition train. At the battlefield, they could be stood on end, stacked on end, and filled with earth to form an effective wall around the gun. They could also be used as a bulletproof parapet along with a sap.

When the Crimean War transpired, there was a scarcity of brushwood. This led soldiers to utilize scrap hoop-iron obtained from hay bales. This design inspired the creation of iron-filled gabion walls.

Today, the military uses gabion walls to safeguard their bases against fragmentary, explosive, mortar, or artillery fire. Examples of forwarding operating bases (FOBs) that use gabion walls are mess halls, sleeping quarters, and any other areas that house a large concentration of unprotected soldiers.

Civil Engineering

The most common use of gabion walls in civil engineering came about in the late s in order to stabilize shorelines, slopes, and stream banks against soil erosion. Other applications in this realm include retaining walls, temporary floodwalls, noise barriers, silt filtration from run-off, river training, channel lining, and construction of temporary dams.

Over the years, the use of gabion walls has diversified as they are used in both military and civil engineering projects. Some architects have also incorporated gabion walls in their designs. Gabion walls accentuate the building's design and give it a sturdy feel, not to mention the added aesthetic appeal they provide.

Types of Gabions

The type of gabion used in any project depends on cost and function. That being said, there are four types of gabions. They include:

1. Gabion Baskets

Gabion baskets are generally made of wire mesh and constructed in box shapes. They vary in size and are mainly used in highway and railway projects. Gabion baskets are an economical choice for any project, especially if the filler material is available on-site.

2. Gabion Mattress

Also known as Reno mattresses, gabion mattresses have a lower height than other types. They are mostly used in channel lining to prevent erosion. They deal with wave and erosion-induced erosion by reducing water velocity.

3. Gabion Sacks

This type of gabion is made from porous, flexible structures including cylindrical wire mesh constructions. They are mainly used in hydraulic works in emergencies since they can be built quickly.

4. Gabion Wire Mesh

This type of gabion design is used to protect railway and highway surfaces from rock and stone falls. They maintain the slope's stability adjacent to the railways and highways and are also used as anti-erosion agents by providing a reinforced cover over the loose material.

Applications of Gabion walls

Gabion walls are often used as retaining structures such as revetment and tower walls, retaining walls, and embankments and cuttings. They can also be utilized as noise barriers, temporary floodwalls, or for aesthetic purposes including landscape elements and veneers. Riverbank defenses, sea walls, dams, canal banks, groins, and weirs are applications to prevent erosion and protect lakesides and reservoirs. Gabion walls can also be utilized to divert the force of floodwater around weak structures or in the construction of dams and foundations. Lastly, they can be used to enhance energy dissipation in channels, as is the case with stepped gabion structures.

Advantages of Gabions over other Erosion Control Methods

1. Durability

Gabions are the most durable of all forms of soil erosion control methods. They also have a high resistance to atmospheric corrosion, brought about by the bonded zinc coating on the wire mesh and optional PVC coating. Gabion walls can also support vegetative growth at the top, which acts as a shield against the elements and provides additional reinforcement by interlocking with the onsite soils.

2. Permeability

Gabion walls provide easy and instantaneous drainage. This eliminates the need for drainage pipes in most applications.

3. Flexibility

Gabion walls can settle and deform without losing their efficiency. This makes them especially suitable when moving water and unstable ground are a concern.

4. Economical

Gabion walls are more economical in terms of both labor and material than other alternatives, especially when the filler material is available on-site.

5. Strength

Gabion walls are very strong and stable. This makes them especially suitable for resisting torrential force, flood forces, earth and ice pressure.

6. Eco-friendly

Recycled materials can be used as a filler and placed in the gabion cage. The soil in the gaps between filling materials allows vegetation to grow over time. Also, the materials used in gabion construction are not affected by the elements and, therefore, do not affect the environment.

Gabion Maintenance

Gabion structures consist of steel wire mesh treated with an anti-corrosion agent, filled with a granular material to form a gravity structure. The weight of the structure enables it to resist the pressure exerted on it from behind. Although gabion walls are very durable, they are still susceptible to mechanical damage due to impact and deformation.

Gabion maintenance involves visual inspection, usually done annually. Any damage spotted during the inspection should be dealt with according to the purpose of the gabion. Gabion walls that serve essential purposes like damming should be repaired immediately to stop further damage and minimize the risk they pose in that damaged state.

Abnormalities spotted during the visual inspection of gabion walls may include: broken components, localized bulging of the face, vegetation at the face, damage by vandalism or impact, or excessive water through the face.

What should you look out for when inspecting a Gabion?

1. Local Minor Impact Damage

Individual broken, split or damaged cage components don't affect the gabion's structural integrity and can be repaired on the spot if need be. However, if several gabion components are broken in the same area, this may affect other areas' integrity on the gabion wall. Professionals should repair the damage.

2. Major Collision Damage

This might pose a massive risk to the gabion wall's structural integrity and should, therefore, be repaired by professionals since they may require rebuilding with localized support for the landfill or water body behind the gabion wall.

3. Excavations near the Wall

The presence of an excavation near the gabion wall may affect the structure's integrity. However, the extent to which the excavation poses a risk depends on its depth and proximity to the gabion wall. Any excavation deeper than 0.5 meters near the wall may affect the foundation's stability and lead to the gabion wall's collapse.

4. Vegetation

Gabion cages are filled with inert crushed stones, so they are not susceptible to vegetation growth from within the wall. Vegetation growing on top of the wall does not affect the structure in any way. However, any vegetation growing from within the gabion should be removed immediately.

Geotextiles

Geotextiles are semipermeable textile materials used to improve soil characteristics. They can filter, separate, reinforce, protect, and drain when used together with the soil. Geotextiles are ideal for a wide variety of infrastructure works such as roads, landfills, harbors, and other civil engineering projects.

Types of Geotextile

Geotextiles are made from polymers like polyester and propylene. They are classified into three categories based on how they are made. They include:

1. Woven fabric geotextiles
2. Knitted geotextiles
3. Non-woven geotextiles

1. Woven Fabric Geotextiles

These are some of the most commonly used geotextiles. They are manufactured using the same techniques used to manufacture typical clothing textiles. The weaving process involves slit film yarns, multifilament or monofilament yarns being woven in the machine and cross machine direction. The thread running along the length is called the warp, and the one running perpendicular is called the weft. Woven fabrics can be constructed with polyester or polypropylene or a combination of the two.

2. Knitted Geotextiles

Knitted geotextiles are made by interlocking a series of loops of yarn together. They are manufactured using the knitting technique in conjunction with other geosynthetic manufacturing methods, such as weaving and are generally made with polyester.

3. Non-woven Geotextile

Non-woven geotextiles are constructed from a short staple fiber or a continuous filament polyester or polypropylene fiber. The fiber bonding is done through mechanical or chemical techniques or a combination of both including needle punch construction.

Those manufactured through mechanical interlocking or thermal bonding have a thickness of 0.5 to 1mm, while chemically bonded geotextiles have a thickness of up to 3mm.

Functions of Geotextiles

1. Separation.

During the manufacture of roads, geotextiles are used to prevent the intermixing of two adjacent soils. A similar approach is used in gabion wall and other retaining wall applications by separating soil from the gabion fill or the drainage stone from the soil fill material. An excellent example of this application in roads is when there is subgrade soil bordering an aggregate coarse soil. In this case, a geotextile is used to preserve the aggregate soil's strength characteristics and drainage.

2. Filtration

Geotextiles aid soil conservation by allowing water to drain freely through the soil with limited soil loss. The geotextile&#;s porosity and permeability aid this action.

3. Reinforcement

The introduction of geotextiles in the soil enhances the soil's structural integrity, much like what steel does to concrete.

4. Sealing

During road construction and repair, a layer of non-woven geotextile is placed between existing and new asphalt layers. It then absorbs the asphalt, thus acting as a waterproof membrane layer that minimizes the flow of water into the pavement.

Gabion walls have been in use for more than years now. Although they were initially used as a means of soil conservation, their applications have increased tremendously in military and civil engineering projects. Gabion walls are relatively simple structures, but it is essential to consult a civil engineer whenever you want to use them for large and sensitive projects. Doing so will ensure that the structure not only lasts longer but also provides the desired outcome.

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