Enhancing reinforced soil performance: Polymeric coated steel woven wire mesh and geogrid interaction in composite systems

The pullout resistance at the interface of composite reinforcement systems is a fundamental element in the design of reinforced soil structures. A correct evaluation of this strength allows for the proper sizing of the reinforcement and ensures that the structure can withstand the expected stresses during its lifecycle. This research investigates the pullout behaviour of polymer-coated double twist wire mesh, conforming to EN 10223-3, used in reinforced fill (Terramesh) in various soil conditions and in combination with several polyester geogrids. This research, conducted following the EN 13738 standard methodology with modifications to accommodate the specific test setup, provide the experimental data necessary to calibrate the numerical models used in design and to verify the validity of the simplifying assumptions adopted. The primary objective was to elucidate the interface friction factor between wire mesh facing elements and different structural fills, with a particular focus on the influence of steel wire mesh and geogrid interface. A comprehensive experimental program, encompassing several pullout tests, was conducted to evaluate the load-displacement response, ultimate pullout resistance, and failure modes of the reinforcement system. Normal load, and geogrid type were systematically varied to assess their impact on the pullout capacity. The study aims to provide quantitative data on the performance enhancement achieved through the combined use of polymer-coated wire mesh and polyester geogrids. These findings are expected to contribute significantly to the design and optimization of reinforced soil structures, particularly those employing polymer-coated double twist wire mesh systems, by offering a deeper understanding of the underlying reinforcement mechanisms.