Mechanically Stabilized Access Road Using Co-extruded Multi-geometry Geogrids for Extremely Heavy Loads

Abstract

Access roads designed to support extremely heavy loads pose significant challenges in both design and construction due to the stringent requirements for stability, safety, and minimal deformation. Mechanical stabilization using co-extruded multi-geometry geogrids has proven to be an effective solution for such projects. These geogrids enhance interlock and confinement of the aggregate material, a process in which granular particles partially penetrate the geogrid apertures and lock into place as the overlying material is compacted. This interlock improves stress distribution within the aggregate layer, increasing the bearing capacity and reducing the potential differential deformations. For the first time in South America, an access road was constructed to support the transport of extremely large mining equipment comprising a Spreader and a Tripper conveyor system, with a combined load exceeding 1,250 tons. The subgrade was stabilized by building an engineered mechanically stabilized layer with co-extruded multi-geometry geogrids. Beyond its excellent performance in terms of safety and deformations control, the mechanically stabilized layer solution also delivered cost, time, and carbon footprint savings. This paper presents a detailed case study of this successful implementation and highlights the benefits of using a mechanically stabilized layer constructed with co-extruded multi-geometry geogrids to support extremely heavy loads.