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Geogrids 3D Grids for roads applications 3D Grids per la stabilizzazione dei sottofondi stradali Géogrille 3D Grids pour la stabilisation des sous-couches routières ТРЕХМЕРНОЕ ИЗМЕРЕНИЕ ИМЕЕТ ОТЛИЧИЕ
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  Soil stabilisation  

Three dimensional geogrids TENAX 3D Grids

Geogrids characterised by significant dimensions in all three main directions, optimum interaction with coarse granular materials

 

rinforzo di terreno con geogriglia TENAX 3D Grid XL

 

TENAX 3D GRIDS XL

These geogrids are characterised by significant dimensions in all three main directions.
The particularly thick, concave longitudinal rib section, combined with the 60x55 mm aperture size of the geogrid, allows optimum interaction with coarse granular materials.


 

Geogriglie TENAX 3D grid S per il rinforzo di terreni di medio-piccola pezzatura

 

geogrids for reinforcing medium-small sized granular soils

 

TENAX 3D GRIDS S

Ideal for reinforcing medium-small sized granular soils, having an aperture of 30x30 mm.


 

Geogriglia TENAX 3D grid MS per il rinforzo di terreni fini e meno addensati, limi, argille sabbie

 

geogrid to be used in the presence of fine and less compact soils (lime, clay, or sand)

 

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.

 

 

BENEFITS

  • Possibility to reduce excavation depths by as much as 40%
  • Reduction of the disposal of material from site
  • Substantial reduction in the use of natural aggregates (e.g. quarry stone)
  • Reduction of the frequency and quantity of construction vehicles carrying excavated or imported fill materials.

 

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.

 

 

road stabilization road stabilization problem

 

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
CORRESPONDENCE WITH THE RIBS

geogrids for road stabilization, a greater effective confinement of the soil layer

how the geogrid works

 

 

 

 

TENAX 3D GRIDS - Research and testing


click to view the chart 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

geogrids 3D grids for soil reinforcement and soil stabilization

 

The 3rd Dimension makes the difference

 

Geogrids 3 dimension grid for road stabilisation

 

 

THE IDEAL GEOGRID

 

Under true plain strain conditions an ideal geogrid would be one that:

  • Transmits stress in a direction horizontal and perpendicular to the longitudinal extension of the infrastructure
  • Allows a high level of lateral confinement capable of involving a thicker portion of soil, thus creating a true “geogrid-soil composite”.

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.
Together with the high mechanical characteristics offered by the traditional range of geogrids, TENAX 3D Grids are designed to allow high levels of lateral confinement: the result is a revolutionary new family of geogrids.

 

 

MAXIMIZING INTERLOCKING

 

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 Grid MS

TENAX 3D Grid S

TENAX 3D Grid XL

 

 

 

 

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

 

 

geogrids 3D grids for road stabilization
TENAX 3D GRIDS
Brochure

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