2020 Figure 2 – Number of travels vs. pluviometry. Thus, the engineering challenge was not simply structural adequacy, but how to maintain reliable traffic conditions under high loads, variable materials, and limited construction control, conditions typical of active mining environments. 2.2 Multidirectional Rigid Geogrids The adopted solution introduced multidirectional rigid geogrids within the granular layers to improve mechanical stabilization rather than increasing layer thickness. Unlike reinforcement systems that rely primarily on tensile resistance mobilized after deformation, rigid multidirectional geogrids act immediately by: • Providing confinement of granular particles through mechanical interlock • Restricting lateral spreading under wheel loads • Increasing apparent stiffness of the working platform • Distributing stresses more uniformly to the subgrade This confinement-based mechanism allows the structure to behave as a stabilized composite layer, improving resistance to trafficking loads even when constructed with site-won materials and without strict compaction control. Figure 3 – Non-stabilized vs. stabilized section with geogrids The multidirectional aperture geometry is particularly suited to mining conditions, where load vectors are not uniform due to braking, acceleration, and turning movements. These stresses are common near crushers, ramps, and operational intersections, areas where untreated roads typically deteriorate fast.
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