Evaluation of Installation Damage According to Simulated Installation Test Conditions and Creep Deformation of Geosynthetic Reinforcements

초록

In this study, a total of six geosynthetic reinforcements, including five geogridtypes (design strengths of 4, 6, 8, 10, and 15 ton/m) and a woven geotextile (designstrength of 4 ton/m) were used to simulate the degree of damage according to the installationdamage test conditions, and property evaluation by creep deformation was performed. The degree of installation damage during the construction period of thegeosynthetic samples was tested in accordance with ISO 10722:2019, and soil structurecompaction was performed with fill thicknesses of 20, 30, 40, 60, 80, and 100 cm. After theinstallation damage test, geosynthetic samples were removed, and the tensile strengthbefore and after the installation damage test was compared by applying a wide tensilestrength test (ASTM D 4595). Jumunjin standard sand was used as the filling material andafter a soil compaction installation damage test, the tensile strength of the reinforcing geosyntheticsample decreased by 2−30% overall, and the reduction factor owing to installationdamage was calculated by comparing the tensile strength before and after installationdamage testing. The GRI GS-10 test method was used to evaluate the creep deformation at10 000 h, and the GRI GG-4 method was used to determine the reduction coefficient owingto creep deformation. From the creep test, it was found that the creep strain of the damagedgeosynthetic sample by filling depth under the same load conditions was approximately1−2% higher than that of the undamaged sample.

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