Biaksijalne Geomreže
Armiranje tla za stabilizaciju puteva
Biaksijalne geomreže se uglavnom koriste za potrebe armiranja u aplikacijama za stabilizaciju tla; uglavnom zato što je njihova simetrična struktura u stanju da obezbedi neophodnu snagu i efekat zatvaranja. Zatezna čvrstoća i geometrija ovih geomreža je normalno simetrična sa zateznom čvrstoćom od 20 do 300 (ili čak i više) kN/m; štaviše, polimer i oblici otvora mogu da variraju u zavisnosti od zahtevanih osobina zatezanja i osobina punjenja.
MacGrid EG
Extruded polypropylene geogrids with a symmetric tensile strength of up to 50 kN/m; successfully used in single or multiple layers for many decades in soil stabilization applications is an essential component of many combo-solving solutions.
MacGrid EG-T
Again an extruded polypropylene geogrid but characterized by a triangular shape to have a multi-axial behaviour. These materials are used – as the MG EG – in the same type of applications and are supposed to be an evolution of the biaxial ones.
MacGrid WG-S
High tenacity PET knitted-weaved coated geogrids are also available and used in these types of applications especially when the tensile strength requested exceeds the capacity offered by the extruded ranges; these products are available up to standard symmetric strength of 300kN/m but – on demand – can be proposed up to 1000 kN/m.
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NTPC SIDING-GADARWARA PROJECT– BLANKET THICKNESS REDUCTION
India
The Gadarwara railway station is approx. 20 km from NTPC site. NTPC constructed the Gadarwara railway siding line for transporting coal to their plant. For this railway siding work, the blanket (subballast) material was not available in the Gadrwara area and transportation of blanket material from outside area was not an economical option. This devoid of blanket material was major concern of project. Also, mining has been banned in our country due to environmental issues, so it had become difficult to get quantity for blanket for formation construction. Apart from unavailability of blanketing material, another concern of this project was the inadequacy of good subgrade material. The subgrade material was of SQ1 type which had fines content of more than 50%. Considering these aspects of project, biaxial extruded polypropylene geogrid MacGrid EG and non-woven geotextile solution MacTex N was proposed for strengthening the formation.
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STRENGTHENING OF THE ROADBED LAYER OF THE RN4
The RN4 is one of the major routes in Burkina Faso that connects the capital and largest city of the country, Ouagadougou, to the eastern cities such as Koupela. Within Ouagadougou, the urban section of this national road passes through Komber-Pandema Avenue at the East interchange and traverses wetlands that border the lakes and ponds of the city. As part of the rehabilitation of this wet stretch, the company COGEB International aimed to strengthen the roadbed foundation layer to cope with potential hydraulic pressures and the wet-dry cycles associated with the rainy and dry seasons.
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