Geonet
Mu Jin Yuan is your trusted Geonet supplier in China. With years of experience in the industry, Lianyi Geonets are specially engineered for:
- High tensile strength and durability
- Suitable for gas or liquid applications depending on design
- High load applications
Geonet
Geonet is a Geosynthetic material uniquely distinguished with the parallel ribs linked together. Usually, they tend to have the same structure as the Geogrid.
The ribs in Geonet are such that they determine the material’s tensile strength. Currently, the material remains popular in most drainage systems.
High-Density Polyethylene Geonet
This thermoplastic polymer is prevalent for its longevity, chemical resistance, and high strength. Geonets use true HDPE resin unlike HDPE geomembranes that use medium density HDPE. HDPE geonet ground grids are the most preferred due to enhanced mechanical properties, including great flexibility and tensile strength.
Polypropylene (PP) Geonet
Sometimes, geonets manufacturers combine polypropylene with HDPE to improve certain geonets properties. PP helps in improving the creep resistance and environmental pressure cracking, imparting extra longevity and stability.
Polyester (PET) Geonet
Some types of geonets might also include polyester fibers to boost the strength and reinforcement capability of the material. PET fibers are incorporated due to their high elongation resistance and tensile strength. This makes them important materials in higher load-bearing geonet applications.
Apart from the polymer materials, manufacturers might also incorporate additives to boost geonets performance. The additives can comprise of antioxidants to improve protection against environmental elements, and carbon black to ensure UV stabilization. Other chemical agents can be added as well to boost attributes such as adhesion and friction.
Smooth Geomembranes Vs Textured Geomembranes
applications. It is important that you understand these differences as they are essential when selecting the most appropriate material for your use. Let’s discuss these differences in more detail:
| Key Difference | Geogrid | Geonet |
|---|---|---|
| Structure | Geogrids are manufacture in the form of ribs with openings on either side to form a grid-like system. | Geonets are manufactured in the form of ribs that are joined together to form a net-like structure. |
| Tensile strength | Geogrids provide higher resistance to forces that would cause their deformation. | Geonets have lower tensile strength |
| Application | The primary application of geogrids is to offer soil reinforcement and stabilization. | Geonets find applications in areas where drainage, filtration, and erosion control are critical, |
Advantages of Geonet
Geonets have certain benefits that make them superior to the traditional drainage solutions. Here’s is a brief description of these benefits:
High Flow Capacity – Geonets are highly efficient in the transmission and drainage of fluids. They have a high transmissivity which reduces water cloggage. This ensures effective water management and reduces the risk of water accumulation and related issues.
Durability – Geonets are engineered using materials that can withstand harsh environmental conditions such as UV radiation, extreme temperatures. This allows them to efficiently perform their functions for a long lifespan.
Cost-effectiveness – The light weight of the geonets reduce difficulties involved in transportation and installation. this makes them a cheaper solution for your applications.
Environment Sustainability – Geonets prevent soil erosion by reinforcing the soil granules and protecting the integrity of the soil. This stabilizes and helps preserve the landscapes. They also reduce the risk of groundwater contamination, ensuring the protection of water resources.
Types of Geonet
There exist two established types of geonets that differ on how they direct away fluids and the structure of their ribs. The selection of the most suitable type is determined by the requirements of the specific project site.
The two forms undergo similar geonet manufacturing process that entails continuous extrusion to form netlike network of ribs. However, there is a big difference on how they direct fluid flow.
Biplanar Geonets – These are the earliest and most popular geonet grid types featuring two arrays of crisscrossing ribs at varying spacings and angles.
Biplanar geonets have a fairly simple ribs geometry structure. They feature two arrays of polymeric strips that traverse at constant angle to create a diamond complex. The formed structure has regular thickness and channels that offer better planar flow of fluids under elevated loads.
The key property of biplanar geonet is that rib design facilitates fluid flow about and across the ribs in a comparatively regular pattern.
On this account, they are perfect for most flat drainage systems that might be susceptible to differential settlement. Therefore, biplanar geonet grids are usually used as leachate pads within mines, or landfill bases.
Triplanar Geonet – Tri-planar geonets feature two parallel ribs layers that have small cross-sectional area. Thick vertical ribs having wide cross-sectional area separate these layers. The vertical ribs design enables them to provide greater compressive strength in demanding geonet applications.
When joined together to ensure geometric stability, the triplanar geonet system forms a broad flow channel. This facilitates both directional and regular flow pattern.
In triplanar geonets applications, it is crucial to carefully consider the placement direction. The machine direction of geonet roll should be towards the desired flow direction. This is instrumental in maintaining the channelizing effect and ensure correct funneling of leachate into treatment section or collection tank.
Composite Geonets – Composite geonets systems blend the capabilities of geonet materials and other geosynthetic materials type. For instance, a composite geonet product might integrate non-woven geotextile fixed to a single or both sides, offering extra separation and filtration capabilities.
Due to the added features, you can use geonet composites in the harshest environments with heavy vehicular traffic or loads. There installation can be both in a vertical or horizontal layout.
Cuspated Geonet – Cuspated geonets feature trimmed hollow cones of dissimilar shapes, integrated with a geotextile fabric. The voids in the cones allow for passage of fluids. The non-woven geotextile joined to the geonet core probits migration of soil particles into the core, obstructing drainage sheet.
The one cuspated core plays the role of a high-performance drainage structure. Optimum creep resistance and compressive strength enables the core to retain its drainage ability under a broad range of compressive loadings. The distinctive cones design with clear passages to facilitate flow of fluids in all directions.
Geonet Installation
Here is an overview of geonets installation procedures conforming to industry standards to guarantee best performance of the geonet for its planned purpose:
Step 1: Subgrade Preparation
Prepare the subgrade to ensure it does not have sharp rocks or extra materials that could destroy the geonet materials. Store the geonet rolls in a place permitting easy movement of forklifts, cranes, truck or other handling machinery necessary to move/load the materials.
Step 2: Geonet Placement
Handling of the geonet grids should be in a careful and safe manner adhering to safe handling practices. The weight of geonet rolls can be exceedingly heavy, so make sure to engage personnel who are experts in safe handling of geosynthetic products.
- On slopes, anchor the geonet grid in a correctly measured anchor trench. Subsequently, roll the slope down in a way that maintains the geonet material under tension.
- In windy setting, weight the material’s leading edge with temporary ballasting like filled sandbags till you lay the final cover.
- Make sure not to damage the underlying layers during placement. You can use low ground pressure equipment like ATVs to help in placement over the geonet layer.
- Ensure not to entrap mud, stones and other objects during the geonet installation process.
Step 3: Seams and Overlaps
- The preferred transverse direction overlap should be range from 150mm-300mm, while that in machine direction should be 75mm-125mm.
- On slopes, shingle down the geonet grid ends in the slope direction.
- Place a plastic cable tie in the machine direction once after every 1.5m and once after every 0.3m in transverse direction.
- Some geonet system comes with a geotextile (laminated, tied or separate supply). Overlap the geonet section when the geotextile fabric is at the base of the system. When the geotextile is at the top, overlap, heat bond or sew the geotextile. The exact overlapping or sewing technique is stipulated in the construction drawings.
Step 4: Placement of Cover
- Place any cover materials above the geonet grid with extreme care to avoid damaging the geosynthetic material.
- Ensure to minimize any geonet movement and be keen not to induce any tensile stress in the material.
- You can use wide track machine for spreading the cover soil. Work with the most suitable equipment for the spreading process, which prevents damaging of the material.
- Typically, to avoid damage, observe a cover material of at least 300mm to separate the geonet system from the placement equipment.
Specific Gravity – The specific gravity of a geonet refers to its mass per unit volume in comparison with that of water. It influences the buoyancy, load distribution capabilities and stability.
Rib Dimensions – Geonets are made in the form of rib-like structures which influence their strength and flow capacity. The height, thickness and length of these ribs affect the performance of these geonets.
Planar Angles – The orientation and arrangement of the geonets ribs are described by their planar angles. Planar angles affect the direction of liquid flow and the resistance to this flow.
Junction Characteristics – Junctions are the point of intersection of the ribs. The geometry and extent of connectivity of these junctions influence the overall performance of the geonets.
Aperture Size and Shape – The aperture refer to the openings within the geonet system. the size and shape of these openings influence the filtration capabilities of the geonets.
Elongation and Tensile Strength – Elongation is the quality of the geonet to stretch without deformation while the tensile strength is the resistance to stretching or pulling forces. These properties influence the load bearing capabilities of the geonets.
Compression Strength and Deformation – Compression strength indicates the ability of the geonet system to withstand compressive forces without deforming. It is essential in applications where the geonet is subjected to heavy loads or pressures from the overlying materials.
Shear Strength – Shear strength defines ability of the geonet to resist sliding or shifting when subjected to external forces. This is critical where the geonet is to be layered with other materials and subjected to lateral stress.
Hydraulic Properties of Geonet
Planar Transmissivity
Higher planar transmissivity would mean less resistance to flow of liquids and therefore efficient liquid conveyance. This reduces the risk of water accumulating or the geonet being clogged.
Geonet Applications
Geonets find a wide range of applications in civil engineering and environmental projects:
- Soft Foundation Treatment: Geonets are used to strengthen the foundation of structures that are to be built on soft and weak ground. They improve enhance the soil stability and increase their load bearing capabilities.
- Roadbed Construction: Geonets are used to reinforce the roadways and protect them from deformation. They give extra support and distribute uneven loads hence improving the lifespan of these roadways.
- Slope Protection: Geonets provide support to slopes by distributing the forces acting on them. They also reinforce the soil granules, prevent landslides and enhance the growth of vegetation.
- Bridge Abutment Reinforcement: Geonets are applied in the construction of bridges to offer reinforcement to the abutments and retaining walls.
- Reinforcement of Reservoir: Geonets are applied in the reinforcement of reservoirs as they help to even unbalanced loads. They contain the bottom layer hence improving the stability and integrity of the whole system.
- Geonet Earthquake Applications: Geonets are employed in areas prone to earthquake to improve the soil stability and by doing so reduce the impact of the earthquakes.
- Drainage: Geonets are placed in landfill liners, railways and roadways to improve the flow of water and prevent water from clogging the systems.
Disadvantages of Geonets
Geonets ground grids are extraordinarily versatile geosynthetic products with many advantages and uses throughout several industries. However, every good product must have its drawbacks, therefore, here are the key geonets disadvantages:
High long-term Cost
Geonets cost is the most notable disadvantage of geonet ground grids. The materials might be cheaper compared to other geosynthetic types in the short term because of their durability. However, they may become very expensive over the years if not maintained correctly.
Difficult to Install
Installation of geonets needs specialized skills. On this account, it may be challenging for someone lacking experience in geonet installation to carry out the process by themselves.
Susceptible to Damage
Though durable, geonet grids may still experience occasional tears or punctures. This can result in additional water defacement when not taken care of promptly.
One Stop Geosynthetics Manufactry Leader
Lianyi is a trusted geosynthetic manufacturer for over 10 years with our expertise and vast knowledge in the industry.