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Geosynthetics Soil stabilisation TENAX 3D GRIDS FOR ROAD APPLICATIONS
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TENAX 3D Grids for road applications
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.
Combining the use of TENAX
bi-oriented geogrids with so
ils 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.
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| 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.
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. |
How it works
Comparing the passive wedge development behind the 3D geogrid profiles against traditional geogrids, the profiled rib section of the 3D Grid XL and the multi-layered 3D Grid MS create a wider confining area therefore influencing a larger cross section of the soil.
Passive wedges developed behind rib profiles during operation
TENAX 3D XL geogrids have been designed for use with granular soils and include taller lateral ribs that effectively create several barriers thereby restricting the horizontal movement of stone particles and preventing further displacements from occurring.
| THE RIGHT PRODUCT FOR YOUR SUBGRADE | |
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). |
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 XL data sheet |
TENAX 3D Grid MS data sheet |
Key benefits when using TENAX 3D Grids
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| Increased interlocking mechanism; Increased confinement effect; Increased confining zone; Increased interaction. |
3 Dimensional Integral geogrid
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.
Research and Testing
Pull Out Testing to EN 13738
University of Reggio Calabria - Italy
Laboratory Evaluation & Performance Charts
using the Loaded Wheel Tester.
University of Tennessee - Centre for Transp. Research.
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.