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Three dimensional geogrids TENAX 3D Grids
TENAX 3D GRIDS XL
These geogrids are characterised by significant dimensions in all three main directions.
TENAX 3D GRIDS S
Ideal for reinforcing medium-small sized granular soils, having an aperture of 30x30 mm.
TENAX 3D GRIDS MS
Developed specifically to be used in the presence of fine and less compact soils (lime, clay, or sand), they consist in a multi-layer structure with a spider-web effect that forms a thick network capable of providing high levels of interaction with fine soils.
TENAX 3D GRIDS
EVERY APPLICATION HAS ITS REINFORCEMENT
Geosynthetics are universally recognised as an extremely cost effective method of converting areas with low bearing capacity into areas suitable to be used for various purposes that require overloading.
The basic concept is that the combination of geosynthetic reinforcement with integral junctions and fill soil results in a composite material with improved mechanical performance, allowing an overall economic saving too thanks to the possibility to use locally available fill material, often unsuitable for engineering works.
The increasing cost of transferring unsuitable soil to a dumping area and the need to supply good quality inert materials from quarries, together with the growing environmental care, have made the use of geosynthetic reinforcement more and more diffused.
By reinforcing the granular base layers with TENAX bi-oriented geogrids with integral junction, construction can be carried out cost effectively, quickly and with less environmental impact.
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, sometimes causing the formation of longitudinal ruts.
Traditional flat horizontal layers of geogrid, characterised by an orthotropic (in two orthogonal directions) 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.
3D GRIDs DESIGNED FOR EVERY TYPE OF SOIL
When the passive resistance wedges developed by TENAX 3D Grids are compared with those developed by a traditional geogrid, the special profiled rib section, forming the “vertical backbone” of the TENAX 3D Grids, together with the multilayer structure of the TENAX 3D Grid MS, act on a larger cross section of the aggregate, developing a greater effective confinement of the soil layer.
PASSIVE RESISTANCE WEDGES IN
TENAX 3D GRIDS - Research and testing
Pull Out Testing to EN 13738
University of Tennessee - Centre for Transp. Research
The 3rd Dimension makes the difference
THE IDEAL GEOGRID
Under true plain strain conditions an ideal geogrid would be one that:
TENAX 3D Grids have been developed specifically to provide greater stabilisation, exceeding even the excellent performance provided by traditional TENAX extruded geogrids with integral junctions.
When granular materials are laid and compacted over the reinforcement 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.
The interlocking mechanism is essential for the behaviour of the geosynthetic reinforcement under consideration: this “restraint” which is obviously exclusive and characteristic of a reinforcement geogrid and not of a geotextile, provides an effective confinement against any lateral movement of the granular material, considerably increasing the performance of the road surface and providing a high degree of control on settlements and consequently reducing the formation of ruts and gaps.
This concept has led the Tenax Research & Development team to manufacture and develop a new innovative range of 3-Dimensional Geogrids with integral junctions that maximise the interlocking within the soil or stone/grid matrix, that is to say the connection between the fill material and the geogrid, and that develops this function in the direction perpendicular to the road structure direction.
TENAX 3D GRIDS - Data sheets
TENAX 3D GRIDS - Applications
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