The paper present the assessment of geotechnical parameters and stability analyses of a landfill slope reinforced with hexagonal geogrid (triaxial geogrid). The structure of ribs in hexagonal geogrids is based on equilateral triangle shape, what assures the equilibrium of stress distribution, different to commonly used single or double axial geogrids. The structure of hexagonal geogrids provides high strength and stiffness in all directions and stabilizes the ski slope subsoil. The numerical stability analyses were conducted using classic limit equilibrium method (Bishop method).

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