Abstract
The tensile creep characteristics of geogrids in-soil were studied by using a self-designed creep test device. To study the influence of normal stress on the tensile creep characteristics of geogrids, creep tests were carried out at three tensile stress levels. The restraint of normal stress can reduce the creep strain of a geogrid. The HDPE geogrids exhibited primary and secondary creep stages under restraint. According to the principle of time stress superposition, the creep strain time curves under three different tensile stress levels were moved along the logarithmic time axis to obtain the master strain curve at a given reference stress level. Based on the 500 hours creep test data, the principal curve was used to predict the creep characteristics up to 100 years by the time stress superposition principle.
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