How to Lay Geocomposite: Tips and Techniques

Laying geocomposite correctly is essential for efficient drainage and soil stabilization. In this article, we’ll guide you through the process step by step. We’ll also answer key questions about geocomposite, including its composition, thickness, and its differences from geotextile. Let’s dive in!

What is the difference between geotextile and geocomposite?

Geotextile and geocomposite are employed in civil engineering, each with distinct roles. Geotextile is a single-layer fabric for filtration, separation, and erosion control. On the other hand, a geocomposite combines one or more geosynthetics like geogrid, geotextile, geomembrane, and/or geonet with another material, creating a multi-layer material. Geocomposite serves various functions, including drainage, filtration, and reinforcement.

How thick is the geocomposite drainage layer?

The thickness of a geocomposite drainage layer can vary based on project needs, usually falling between 4 and 10 mm. The choice of thickness is influenced by factors like soil conditions, flow rate expectations, and load-bearing capacity at the site.

What is the geocomposite drainage layer?

Landscape fabric can lessen erosion

A geocomposite drainage layer is a composite material structured to complement or replace sand, stone, and gravel, serving as drainage, filtration, separation, and barrier protection in diverse civil engineering and construction projects. It comprises a geotextile fabric attached to a drainage core, which can be constructed from materials such as HDPE (High-Density Polyethylene), PP (Polypropylene), or even natural substances like coconut fibers. This geocomposite enables water to pass through while preventing soil particles from obstructing the drainage system.

What is a geocomposite made of?

Geocomposites typically consist of two key components: a geotextile layer and a drainage core. The geotextile layer is typically crafted from synthetic materials like polypropylene or polyester, chosen for their durability and resistance to chemical and biological degradation. The drainage core can be constructed from various materials, including HDPE, PP, natural fibers, and sometimes geotextiles, geogrids, geonets, and/or geomembranes.
Steps to Lay Geocomposite:

• Site Preparation: Evaluate the site and excavate if necessary, ensuring the correct slope for drainage.
• Geotextile Installation (Optional): Lay geotextile fabric at the excavation’s base to prevent soil fines from blocking the drainage system.
• Geocomposite Placement: Unroll the geocomposite material over the prepared area, ensuring it covers the entire drainage-required surface.
• Connection and Overlap: Overlap geocomposite rolls by at least 12 inches (30 cm) and secure them using recommended fastening methods.
• Add Gravel or Aggregate: When necessary, add a layer of gravel or aggregate atop the geocomposite to boost drainage capacity.
• Install Perforated Pipes (If Applicable): In specific cases, place perforated pipes on top of the geocomposite to collect and redirect water.
• Cover with Geotextile (Optional): Add another layer of geotextile fabric above the geocomposite to prevent soil intrusion and safeguard the system.
• Backfill and Compaction: Cover the geocomposite and any additional layers with backfill material, such as sand or soil. Compact the layers during backfilling to ensure stability.
• Finish and Test: Finalize the project by applying the top surface layer, like pavement or landscaping. Test the drainage system to verify its proper functioning.

By following these steps and understanding the key characteristics of geocomposite, you can successfully lay geocomposite for various construction and civil engineering applications. It’s important to tailor the process to your specific project requirements for the best results.