Geocell
Product Features
1. It is capable of expansion and contraction, and it can be folded during transportation and stretched during construction. It constitutes a strong lateral restraint and stiffness structure by filling with materials such as sand- stone or concrete.
2. It is formed by light material with stable chemical properties which is resistant to abrasion, photooxidation, acid, and alkali. It is suitable for differ- entsoil and desert conditions.
3. It has a higher lateral limit, anti-skid, and anti-deformation, and can effectively enhance the bearing capacity of the roadbed and load distribution.
4. It can meet different engineering needs by changing height, welding distance, and other geometric dimensions.
Product Description
The geocell is a three-dimensional grid cell structure formed by reinforced HDPE material with ultrasonic welding. And it is a three-dimensional network after being ex- panded. Due to engineering needs, some holes are punched in the diaphragm.
It is mainly divided into geocell, high-strength geocell, and honeycomb restraint sys- tem (Honeycomb restraint system: it is a three-dimensional network made of polymer broadband with ultrasonic welding, and the cells constitute a strong lateral restraints and stiffness structure by filling with materials such as sand, stone or concrete).
Geocells are indeed commonly referred to as cellular confinement systems—a high-performance geosynthetic material designed based on the principle of a honeycomb-like three-dimensional structure, widely used in civil engineering applications. The term originates from the biomimicry of the stable geometric configuration found in natural honeycombs. Formed by welding high-strength polymer sheets into deployable three-dimensional grids, these structures are laid out and then filled with materials such as soil, gravel, or concrete, thereby creating rigid structures with strong lateral confinement capabilities.
I. Basic Structure and Material Characteristics
When unfolded, the geocell forms a three-dimensional honeycomb-like grid that can be filled with materials such as soil, gravel, or concrete, creating a composite structure with high stiffness and strong lateral confinement. It is made from HDPE (high-density polyethylene) sheets and possesses the following characteristics:
1. High Strength and Durability: High tensile strength, resistant to wear, corrosion, and chemically stable.
2. Strong Environmental Adaptability: Resistant to photo-oxidative aging, acids, and alkalis; can be used long-term under extreme climatic conditions. Some products can withstand ultraviolet (UV) aging for up to 15 years.
3. Convenient Construction: Foldable during transportation, occupying minimal space; easy to deploy and install, enabling high laying efficiency.
II. Main Types and Applications
Based on structural design, geocells can be classified into the following types:
1. Smooth-surface Geocell
Features a non-perforated surface, suitable for waterproofing and anti-seepage applications, such as landfills and pipeline supports.
2. Perforated Geocell
The cell walls contain small holes that allow water and air to pass through, making it ideal for ecological slope protection and vegetation restoration projects, as it facilitates root penetration and drainage.
3. Textured-surface Geocell
Features an embossed surface treatment that enhances friction between the geocell and infill material, improving overall stability. It is commonly used in heavy-duty roads or soft foundation reinforcement.
III. Core Application Areas
1. Road and Railway Engineering
· Subgrade Reinforcement: Geocells are laid on soft soil foundations and filled with crushed stone to effectively distribute loads, reduce differential settlement, and enhance load-bearing capacity.
· Prevention of "Bridge-end Bumping": Used for reinforced backfill behind abutments to minimize differential settlement between structures and embankments.
· Road Construction in Permafrost and Desert Regions: Ensures minimum embankment height in permafrost areas, while in deserts, locally available materials are utilized to construct stable roadbeds.
2. Slope Protection and Ecological Restoration
· Landslide and Erosion Prevention: The three-dimensional structure restricts lateral soil movement, enhancing slope stability.
· Ecological Slope Protection: After filling with planting soil, vegetation can be directly planted or seeded, enabling simultaneous engineering protection and greening.
· Loess, Saline, and Expansive Soil Treatment: Provides vertical reinforcement effects under special geological conditions, outperforming traditional masonry protection methods.
3. Other Engineering Applications
· Riverbank and Levee Protection: Used for riverbank slope protection to resist water erosion and extend the service life of engineering structures.
· Mine Reclamation and Desert Control: Stabilizes soil in harsh environments and increases vegetation coverage, with case studies showing improvement from 30% to 85%.
· Urban Infrastructure: Applied in supporting underground pipelines and constructing retaining walls, offering advantages of rapid construction and low cost.
IV. Construction Key Points
To ensure optimal performance of geocells, the following critical construction steps must be followed:
1. Slope Surface Preparation: Remove loose and hazardous rocks to ensure a smooth base surface, avoiding stress concentration that may cause weld joints to crack.
2. Installation from Top to Bottom: The primary load-bearing direction should be perpendicular to the subgrade; horizontal installation is strictly prohibited.
3. Anchoring and Fixation: Secure the top with anchor rods or anchoring trenches, and connect adjacent cells with coupling clips or binding wires to ensure structural integrity.
4. Filling and Compaction: The fill material should be 2–5 cm higher than the cell height, compacted promptly, and vegetation planted to enhance ecological benefits.
5. Drainage System Integration: Install main drainage ditches at intervals of approximately 4 meters to prevent erosion of the slope caused by water accumulation.
