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Temporary Access Road in Athi River for Wind Farm Project, Kenya

Wind power is fast becoming the most desirable and dependable source of renewable energy around the world, and Kenya has jumped on the bandwagon to boost its nation’s share in wind energy production. Though still relatively few wind farms exist in Kenya, it aims to generate 9% of its total capacity by 2030.

One of the challenges of developing wind farms is access; getting giant turbines & wind blades transported to remote areas where access roads must be built to withstand heavy traffic. For the Kinangop Wind Farm project access was a problem. The existing road infrastructure was too narrow and winding in some areas in Athi River, which could not accommodate the turning radius of extended trailers carrying the wind blades. A new temporary access road was required which crossed over an area with varying types of weak soils. Using a Geosynthetic solution was critical for the access road to be feasible and provide a stable solution.

Subgrade preparation.

Placement of fill material on Secugrid 40/40Q6 and geotextile.

Secugrid Reinforcement in Wind Farm Access Roads

Secugrid provided a cost effective method to achieve a safe and stable solution for a temporary road construction over low strength subsoils. The CBR values ranged from 1-3%. To avoid excavating too much soil, Secugrid 40/40Q6 was placed on a 200gsm TB16 separation geotextile layer between the subsoil and overlaying base course. The base course layer was reduced to 400mm which proved to be sufficient and achieved uniform stress distribution.

The GeoMatt TB16 geotextile was essential to prevent intermixing of the subsoil and base course layer. Simply by placing the geotextile, the bearing capacity is already increased by avoiding material loss into the subgrade. In some areas of the access road the groundwater was approx. 0.1m above the top ground surface. The geotextile allows water to pass through while retaining soil particles, preventing migration of fine material as a result of pumping effects from the subgrade to the surface, under dynamic loads such as traffic.

Secugrid installation over GeoMatt TB16 geotextile separation layer.

Placement of cover fill material.

Excellent Stress/Strain quality of Secugrid

Geogrids reduce deformation and increase bearing capacity, stability and safety of soil reinforced structures. Secugrid is known for its high modulus and high tensile strengths at low strains with low creep tendencies.

Outstanding Interlocking

Secugrid geogrid distributes loads over a greater area via its flat, stiff bars. Secugrid is able to do this through its interlocking of granular material with its geogrid apertures and the friction between the soil and textured surface of the flat Secugrid bars. This outstanding interlocking performance with aggregate and high tensile stiffness of the Secugrid reduces soil deformation and ensures high integrity of reinforced soil structures.

High Performance in Soil Stabilisation & Reinforcement

Manufactured with high quality raw materials, Secugrid is a very robust geogrid providing high performing capabilities for a wide range of soil stabilisation and soil reinforcement applications. It has excellent resistance to chemical & biological factors ensuring long term durability and performance in challenging applications.

Advantages of Secugrid

  • Cost Saving alternative to conventional methods
  • Very High Strength at Low Strains
  • Immediate Interlocking Effect
  • High Angles of Friction due to the Textured Geogrid Surface
  • High Resistance against Installation Damage
  • 4.75m Wide Rolls
  • Manufactured from Uniformly Extruded Solid PET or PP Bars
  • High Resistance against Biological + Chemical Attack
  • Biaxial Geogrid Strengths up to 120 kN/m
  • Quick & Easy to Install
  • Low Torsional Rigidity
  • Low Creep Tendency
  • High Long-Term Strength
  • Suitable for various Civil Engineering Applications

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