Biaxial Geogrids
Soil reinforcement for road stabilization
Biaxial geogrids are used mostly for reinforcement purposes in soil stabilization applications their symmetric-multiaxial structure can increase the bearing capacity of the existing subsoil providing the necessary strength and confinement effect. The tensile strength and the geometry of these geogrids are normally symmetric with tensile strengths from 20 to 300 (or even more) kN/m but three or more axis versions are available; also the polymer and the opening shapes can vary according to the tensile requirements and the fill properties.
Maccaferri’s range includes different families of products:
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.
Success Stories
Built, not just drawn
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CLOSING OF THE SERMONDE LANDFILL: GEOSYNTHETIC SOLUTIONS
Portugal
The Sermonde landfill site in Vila Nova de Gaia began operating in 1999 as a facility for receiving municipal solid waste. During its 22 years of operation, it served the combined population of Vila Nova de Gaia and Santa Maria da Feira, receiving a total of 2,472,880 m³ of waste. In 2021, after reaching its maximum capacity, waste disposal was halted and technical closure works began. The interventions included topographical surveys, characterisation studies and adaptation measures to ensure safe sealing. In the future, there are plans to transform the landfill into a public park with recreational, sports and children’s areas. The project also envisages landscape integration through the planting of native vegetation and the reconfiguration of the land to restore and enhance the space for the benefit of the community.
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EXPANSION OF THE PORT OF MANILA
As Asian Terminals Inc. (ATI) continues to expand capacity and boost efficiency at the crucial trade gateways for the Philippines, major upgrading projects at the Manila South Harbor are currently underway to support the growing economy. The 137. 5-hectare (1. 375 km²) Port of Manila is entirely made of reclaimed land; hence, port developers and engineers are looking for cost-effective alternatives to improve the port expansion grounds.
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RABAB HARWEEL INTEGRATED PROJECT - PDO
Rabab Harweel Integrated Project (RHIP) is located in the Harweel Cluster of oil fields in the south of the Sultanate of Oman. The present phase of the project involves many heavy machineries & pipelines which were to be constructed in a problematic foundation soil. Several areas (7 locations) within the project site had existing soil with high gypsum content (6% - 12%) which were susceptible for dissolution and in turn can cause un-predictable settlement. Specifically, the foundation soil with a gypsum content >5% is not acceptable as per the project requirements; from bearing capacity and diferential settelement criteria. Realizing that the conventional ground improvements & deep foundations can consume huge cost, time and require tedious construction activities, the alternative option of ‘ground stabilization with geogrid’ proposed by Maccaferri was agreed by the client.
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Biaxial Geogrids
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