Mechanical Property Analysis of Reinforced Soil Under Cyclic Loading

This study aims to investigate the mechanical behavior of reinforced soil under various loading conditions, with a focus on the effects of normal stress, cyclic amplitude, reinforcement angle, reinforcement materials, and pullout rate on its mechanical properties. The findings indicate that the shear strength of soil reinforced at a 30° angle is maximized under monotonic shearing, while the peak strain value is observed at a 180° reinforcement angle during cyclic shearing tests. Both shear stress and stiffness increase with the number of loading cycles, while the interface damping ratio decreases before stabilizing at a constant value. In cyclic pullout tests, the reinforced soil exhibits significant hardening behavior under different conditions, with the peak pullout resistance steadily rising as the number of cycles increases. However, for uniaxial geogrid reinforcement, the pullout resistance initially increases and then declines with continued cycling. Moreover, in post-cyclic pullout tests, a marked reduction in pullout resistance is observed at a displacement of 25 mm, suggesting considerable degradation in the structural integrity and strength of the geogrid.