Composite Drainage Net

Introduction

In this project, drainage net (also known as geonet) was applied as part of the construction system to provide efficient water drainage and soil stability. When combined with geotextile or geomembrane, the drainage net formed a complete drainage and anti-seepage system, improving both safety and durability of the project.

Role of Drainage Net in Construction

1. Efficient Water Discharge: The drainage net creates continuous channels for rapid water flow, preventing waterlogging and pore pressure buildup in soil.

2. Soil Stability: By reducing hydrostatic pressure, the drainage net improves slope stability and prevents soil erosion.

3. Integration with Geosynthetics: Often used together with geotextiles and geomembranes, the drainage net enhances anti-seepage performance while allowing controlled drainage.

4. Durability: Made of high-strength polymer, it resists compression, chemical attack, and long-term deformation.

5. Cost and Time Efficiency: Simplifies drainage system construction compared to traditional gravel drains, reducing labor and material costs.

Construction Method

1. Base Preparation: Clean the construction surface, removing debris and leveling the soil. Compact the base to ensure stability.

2. Geotextile Placement (if required): Place a geotextile layer under the drainage net to act as a filter, preventing soil from clogging the drainage channels.

3. Drainage Net Laying: Roll out the drainage net over the prepared surface. Ensure proper overlap between adjacent rolls (10–15 cm). Connect joints securely to maintain continuity of flow channels.

4. Protective Layer Placement: Cover the drainage net with another layer of geotextile or directly with soil, depending on design requirements. In landfill or pond applications, it is usually sandwiched between geomembrane and soil.

5. Anchoring and Finishing: Anchor the edges into trenches or fix with weights. Ensure smooth transitions and avoid wrinkles or folds that may hinder drainage.

Application Effect

After installation, the drainage net effectively improved water discharge capacity, reduced soil pressure, and stabilized slopes. It provided reliable long-term performance, minimized maintenance needs, and demonstrated significant advantages over traditional drainage methods in terms of efficiency, cost savings, and environmental protection.