PRACTICAL INVESTIGATION OF GEOGRID-REINFORCED GRANULAR SOIL AT CYCLIC LOAD

To examine the impact of confining pressure on the dynamic properties of geogrid-reinforced gravel soil under a similar dynamic stress ratio and dynamic stress amplitude, a dynamic triaxial test was conducted using the dynamic triaxial test apparatus. This study investigates the effect of confining pressure on the axial cumulative strain, elastic modulus, and dynamic pore pressure of reinforced gravel soil. The investigation is done under equal dynamic stress ratio and dynamic stress amplitude conditions. The findings indicate that, under equivalent dynamic stress ratios, there is a positive correlation between the increase in confining pressure and the axial cumulative strain. Conversely, the relationship is reversed when the active stress amplitude stays constant. Furthermore, increased confining pressure leads to similar values for both the elastic modulus and dynamic pore pressure. Both the modulus of elasticity and dynamic pore pressure increase when emotional stress amplitude remains constant. The damping of the elasticity modulus becomes more apparent during the initial phase of vibration, and attenuation is most evident when the confining pressure reaches 120kPa. The confining pressure significantly influences the dynamic pore pressure of reinforced gravel soil, whereas the pore pressure ratio remains unaffected. As the confining pressure increased, there was a corresponding increase in the dynamic pore pressure. Additionally, the pore pressure ratio remained relatively stable at approximately 0.6.