The steel-plastic compound geogrid has been widely used as a new reinforcement material in geotechnical engineering and other fields. Therefore, it is essential to fully understand the mechanical properties of steel-plastic compound geogrid-reinforced belts to utilize steel-plastic compound geogrids efficiently. In this study, tensile mechanical tests of steel wire, polyethylene geogrid belt, and steel-plastic compound geogrid-reinforced belt were conducted with respect to the tensile mechanical properties of steel-plastic compound geogrid-reinforced belts. In addition, the minimum reinforcement and optimal reinforcement ratios of steel-plastic compound geogrid-reinforced belts were summarized. The results showed that the steel-plastic compound geogrid-reinforced belts possessed an incongruent force of the internal steel wire during the tensile process. The tensile stress-strain curve of the steel-plastic compound geogrid-reinforced belt can be divided into the composite adjustment, steel wire breaking, and residual deformation stages. The tensile strength of the steel-plastic compound geogrid-reinforced belt is proportional to the diameter and number of steel wires in the reinforced belt. The minimum and optimum reinforcement ratios of steel wire in the steel-plastic compound geogrid-reinforced belt were 0.63% and 11.92%, respectively.
Keywords: minimum reinforcement ratio; optimum reinforcement ratio; steel–plastic compound geogrid-reinforced belt; tensile test.