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TENAX 3D GRIDS 3-dimensional geogrids

TENAX 3D GRIDS 3-dimensional geogrids

TENAX 3D grid XL


TENAX 3D Grid MS has been designed for use with finer soils and include multiple geogrid layers through which the interlocking mechanism can develop thus preventing further horizontal displacements.
TENAX 3D Grid MS is manufactured from a unique extrusion technique forming a multilayered product having a network of multiple connections thereby enhancing the interaction properties of the geogrids when used with finer soils.




TENAX 3D grid XL


TENAX 3D Grid XL is manufactured from a unique extrusion technique resulting in a perforated polypropylene sheet that is specifically shaped in three directions (3D).

This special extrusion technique produces a particularly large concaved shaped rib thereby trapping stone particles within the large apertures and enhancing the interaction mechanism between geogrids and granular soils.





The 3rd Dimension makes the difference


TENAX’s 25 years experience has confirmed that stabilisation of soils is an extremely cost effective method of converting areas of weak soil into a usable and environmentally sound construction material.


3 dimension grid for road applications


Combining the use of TENAX bi-oriented geogrids with soils to create a much improved grid/soil composite has meant that many soils found on site can be improved cost-effectively for applications in: Roads, Railways, Airfields, Reinforced earth structures e.g. for walls and steep slopes, Container ports, Working Platforms for rigs and other heavy plant.

By reinforcing the granular base layers with TENAX geogrids, construction can be carried out cost effectively, quickly and with less environmental impact due to reduced excavation depths (up to 40% less), less disposal of material from site and an overall reduction in the use of natural aggregates.

Rising landfill and aggregate costs together with environmental considerations have made the application of TENAX bi-oriented geogrids a must for all contractors. The range of successful ground stabilisation projects covers a broad spectrum from high profile sites such as the Olympics, European Main Line Railways, Highways and Airports to smaller sites like sports pitches, small housing projects and single track roads.



Maximising interlocking

When granular material is compacted over TENAX LBO geogrids, stone particles partially enter the apertures of the grid and are eventually "locked-in" to create a strong and positive interlock along the plane of the geogrid.


This key interlocking mechanism enables the grid to resist horizontal movement of the stones which improves the performance of the pavement and provides a high degree of control on settlements.


This concept has led the TENAX Research & Development team to manufacture and develop a new innovative range of 3-Dimensional Geogrids that aim to maximise the interlocking within the soil or stone / grid matrix.



Greater lateral confinement

TENAX 3D Grids products have been developed with the aim of allowing the most efficient use of reinforcement in the most challenging environments.
The performance benefits now go beyond TENAX bi-oriented geogrids and provide even more cost effective designs.


In addition to the high mechanical characteristics provided by the bi-oriented range, TENAX 3D Grids have been designed to produce a greater lateral resistance. The result is a revolutionary new geogrid system that is able to act through a wider cross section of soil thereby creating a true grid/soil composite material.



Main characteristics

3 Dimensional Integral geogrid
3 layers of bi-oriented geogrid
Tall, vertical lateral ribs
Multiple rib connection points
Different apertures for aggregate size



Key benefits when using TENAX 3D Grids

Increased interlocking mechanism;
Increased confinement effect;
Increased confining zone;
Increased interaction.

Three dimensional geogrids TENAX 3D GRIDS brochure




TENAX 3D GRIDS - Applications

Paved and unpaved roads stabilisation

Railroads and airport runways

Superficial structural foundations

Permanent and semi-permanent loads spread over large areas

Foundations of roads, embankments and earth dams

TENAX 3D GRIDS - Installations
Pull Out Testing to EN 13738
University of Reggio Calabria - Italy


click to view the chart Laboratory Evaluation & Performance Charts
using the Loaded Wheel Tester.

University of Tennessee - Centre for Transp. Research.




A bit of theory
The concept of the plain strain condition in geotechnical engineering is relevant to conditions near strip foundations, embankments, retaining walls and other long structures. It describes how for these types of structures, the strain in one direction is taken as zero along the direction with the greater dimension. Also, the state of stress is directed mostly in the two directions with smaller dimensions.

These types of geometry are very common in civil engineering as they also represent every road, railway structure where loads are distributed through a long channelized geometry.

Traditional flat horizontal layers of geogrid, characterised by an orthotropic or even by a perfectly isotropic behaviour are not necessary, as they are providing the same strengths in the direction of the structure and in the direction perpendicular to the structure.

Therefore, the use of such geogrids is inefficient and represents a waste of strength and money for the end user.



The ideal geogrid
Under true plain strain conditions an ideal geogrid would be one that is capable of dissipating stresses in directions horizontal and perpendicular to any road or railway structure.

The effectiveness of such reinforcement depends upon its capability to interact with the soil forming a grid/soil composite layer. Through continual research and testing, TENAX have been able to optimise the interaction of geogrids with the soil further through the development of a new patented 3D range of geogrids.