The emergence of geosynthetic materials has brought about a noticeable change in civil engineering as they address the industry’s technical and economic challenges. Geogrids are the backbone of this industry. These materials serve not only as a protective shield but also reinforce weak soils for stability and increase load-bearing capacity.
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In this blog post, we will discuss geogrid soil reinforcement, examine how geogrids can be used to strengthen the soil, as well as explain the working principle of geogrid-reinforced soils – and finally highlight some points that should be observed in the design and installation of geogrids to reinforced soils.
Geogrid soil reinforcement is an innovative engineering practice to improve soil strength and stability using different types of geogrids. This revolutionary approach has transformed the construction industry by offering several benefits compared to traditional methods. A geogrid is a grid-like polymeric structure available in uniaxial and biaxial forms made from high-density polyethylene [HDPE] or polypropylene to ensure its durability and resistance against different environmental factors. When installed in layers in the bulk of soil, the geogrid becomes intertwined with soil particles, creating a composite material with significantly enhanced properties. The main purpose for using geogrid-reinforced soil is during the construction of retaining walls.
Traditional retaining walls normally require deep excavation combined with concrete or masonry, which could be expensive and time-consuming. Thus, geogrid can be used to reinforce soil out of locally available soils, leading to reduced material costs and environmental footprint. The geogrid acts as a vital reinforcement that stops the soil from caving in, thereby enabling steeper and higher walls.
Geogrid-reinforced soils are also employed in other areas apart from retaining walls, namely roads, construction, embankments, or stabilisation of slopes. The load-bearing capacity of the soil can be enhanced by using this innovative solution.
The interaction between soil and geogrid is the basis of the reinforced soil structure arrangements. Many parameters influence this multifaceted interaction and play an important role in the overall performance of the constructed system. When a geogrid is embedded in the soil, the frictional resistance between the soil particles and the geogrid’s surface prevents the reinforcement from being pulled out. Following factors influence this frictional force:
Geogrid soil reinforcement is a method used for decades. It uses a hard, flexible plastic mesh to make soil stronger. To simplify, the soil provides compressive strength, and the geogrid gives the structure tensile strength to produce a compound material. First, the geogrid is embedded into the soil, allowing the soil to connect with the grid’s holes. This binding process is produced by joining the two main elements and creating a unit that cannot be broken into parts.
When the geogrid is under a load, it distributes stress evenly on a larger area, making this way of preventing local failure and ensuring not only local but also general stability. This magnified stability makes it a game-changer in many fields, such as road construction. A geogrid reinforcement is one of the most notable methods used in soil treatment, and one of the advantages is that less soil is needed. The technique of mixing sand, cement, gravel, and water with polyethylene geogrids is a brilliant one to lessen the number of soil layers, materials added, and project duration.
Geogrid has a unique performance that depends on different variables such as properties of the soil. The aperture size of geogrids used in this process is a very important consideration here. Due to the design and material of the geogrids, they provide high tensile strength which is their typical behaviour. The right solution and proper installation are the two factors in each geogrid design; these are the main requirements to gain the desired reinforcement properties.
Geogrids are affected by the soil’s attributes, such as its type, strength, and moisture content. These properties are the main considerations that can affect the selection and installation of the geogrid.
It is important to make sure that the geogrid is installed smoothly and uniformly, without any wrinkles or creases. Geogrid sheets normally have overlaps. The overlap length should stick to the design of the sheet.
The installation should be carried out in the units of layers, which are the design structures of the individual sections. Each layer of the project is required to undergo the process of being fully compacted to achieve sufficient density.
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There are times wherein a geogrid may not acquire protection through geometries and overlays from locations prone to construction damages. In circumstances such as this, geogrid protection necessitates a systemic approach that shields the aggregate surface from environmental action.
Keep accurate records of the process of installation, such as the amount of materials used, the machinery used, and the names of the personnel who were a part of it.
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Using good soil reinforcement will cut back on erosion caused by wind and water. Wind and water will stir up the soil causing a loss of growth among plants and will affect the topsoil. In many cases, pollution will increase caused by water. Places that are highly susceptible to erosion include slopes and windy unprotected bare ground. The reinforcement procedure you choose will depend on the landscape and the erosion you need to correct.
If you cover the soil with mulch or plant ground cover, you will improve the soil and prevent displacement. Also, the leaves of thick or compressed plant ground cover will keep the soil in place during rain. Choosing the right plants for controlling erosion include Taiwan Raspberry and Serbian Bellflower. There are other plants you should stay clear of such as Periwinkle and English Ivy.
When applying mulch, you have to spread a good layer of straw, gravel, or wood chips material making sure the soil is totally covered. The material will keep moisture in, preventing soil conditions that can escalate the odds of soil getting blown away.
Plants are a great alternative to plant ground cover. Just make sure you cover the entire area with separate plants then add other plants like flowers, shrubs, and trees for a nicer look. One good thought, larger plants have deeper root systems that can help reinforce the soil. The foliage on larger plants, like trees, will stretch over the soil diffusing rain so soil will not wash away.
Terracing is a geographical term that is made of a sloping surface that is usually bounded on one side by a steeper slope.
A steep slope can increase soil erosion as water rushes down the hill. For long, steep slopes, terracing is a way to keep the soil in its place. Terraces will slow down water preventing water from rushing downhill, taking the soil with it.
Installing a series of short retaining walls heading down the slope is an easy way to create terraces. Ground cover planted on the terraced ground will offer increased stability for the soil.
Geotextile is a fabric made from synthetic fibers woven together to create a porous material. The fabric is laid over the soil sitting firmly in place against the soil for reinforcement to prevent erosion.
This approach is used in construction to make sure the soil stays in place until permanent structures are built and ground cover has become established.
In some cases, the fabric is spread over the soil on a temporary basis after planting seeds to protect them from washing away until the seeds start growing.
Geogrid products are typically composed of high strength polyester yarns (or similar material) and resemble a heavy duty mesh. These products help to keep aggregate in place in areas such as beneath roads or behind retaining walls. They are often used in conjunction with geotextiles for providing a reliable reinforcement solution.