Experimental research on cumulative strain characteristics of reinforced sand under cyclic loading
To investigate the influence of reinforcement under cyclic,high-density polyethylene(HDPE)geogrids were used as reinforcement materials.Triaxial dynamic tests were conducted on sand samples taken from actual engineering sites to study the evolution of axial cumulative strain with varying reinforcement layers and spacings.The mechanism by which reinforcement influences the test process was also analyzed.Results indicate that reinforcement significantly reduces the axial cumulative strain of the sand.Adding more layers of reinforcement significantly reduces the axial cumulative strain,although the marginal benefit decreases with each additional layer.All axial cumulative strain curves for different reinforcement spacings conform to the modi-fied Monismith model,showing a noticeable reduction at a spacing of 80 mm.Reinforcement affects the sand in two primary ways.First,the elastic properties of the reinforcement material contribute to the elastic deformation recovery,which decreases the displacement of nearby sand particles.Second,improved interlocking at the reinforcement-soil interface creates a pseudo-cohesive force that stabilizes the soil.These findings offer provide insights for further research into the reinforcement mechanisms.
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