Reassessment of Long-Term Performance of Geogrids by Considering Mutual Interaction among Reduction Factors

Abstract

For estimating allowable tensile strength of geogrids by reduction factor, it has a limit not to consider interaction force among reduction factors. Junction strength would be reduced by installation damages or chemical degradation as same as tensile strength. Single junction test method cannot properly cover for damaged samples and shows large deviations as it does not consider scale effect. Especially for calculating shear strength, no reasonable study to consider all reduction factors was conducted yet. Therefore, in this study, (a) reduction factors that may affect the long-term performance of geogrids were revaluated to consider various application conditions and (b) accurate long-term allowable tensile strength was calculated to consider interrelation among reduction factors. Creep results after installation damage and chemical resistance test showed lower value than that of GRI GG-4 calculation. After installation damage and chemical resistance test, the reduction factor of junction strength was less than that of tensile strength. Finally, shear strength before and after installation damage showed no change before and after installation.