中文摘要：

运用蠕变系数法和时间-应力等效原理分析塑料土工格栅的蠕变行为．运用时间-应力等效原理，可以由较高应力水平下较短时间的试验数据，通过沿时间轴的平移得到较低应力水平下材料的长期性能．计算结果表明。蠕变系数法和应力移位方法所得结果吻合良好．时间-应力等效原理适用于对塑料土工格栅长期蠕变性能进行加速表征．

英文摘要：

The Creep coefficient method and the time-stress equivalence principle are used to investigate the creep behavior of plastic geogrids. According to the time-stress equivalence principle, the creep compliance vs, time curves at five different stress levels are determined and shifted along logarithmic time axis to get a master compliance curve at a given reference stress level. It is shown that the predictions made by creep coefficient method and the stress shift technique are agree well with each other. Thus the time-stress equivalence principle provides an accelerated characterization technique to evaluate the long-term creep properties of plastic geogrids.