Geosynthetic Embankment Stability on Soft Ground Considering Reinforcement Strain

摘要

The existing ways of designing embankment using geosynthetic have been focusing on soil strain rather than reinforcement strain. With regard to destruction to embankment using geosynthetic reinforcement, the behaviors of geosynthetic reinforcement and soil are the same at the initial stress phase, whereas they make a gap in strain as stress increases, This issue may have a big impact on reinforcement as a critical factor of geosynthetic reinforcement design in earth structures. This study shows reinforcement stress and soil stress in embankment reinforced by PET Mat on soft ground through the quantitative analysis on strain behavior. As the result, reinforcement strain greatly depends on the tensile strength of reinforcement, regarding destruction. The maximum stress on reinforcement by external loads will not exceed the yield tensile strength and it will be ideal when reinforcement stress is higher than the stress in soil of embankment. In addition, the safety factor with shear destruction of embankment will increase together with the yield tensile strength of reinforcement, though the factor will be unchanged after reinforcement strain matches soil strain.