塑料土工格栅力学行为研究——Ⅰ.短周期力学行为的分析

Mechanical Behaviors of Plastics Geogrid——I.Analysis of Short Term Mechanical Behaviors

测试并记录土工格栅试样的蠕变伸长随时间的变化情况,得到试样应变和时间的关系。应变-时间关系显示载荷较小时,蠕变发展缓慢;载荷较大时,蠕变应变较大且发展较快。由应变-时间关系得到了应变速率-应变关系和等时载荷-应变关系,由此可评价试样蠕变发展的趋势,确定蠕变应变极限。这些工作为进一步对土工格栅长期蠕变行为研究做好了准备。

Plastics geogrid creep elongations vs. Time were tested and recorded. Strain-time relations show that creep strain develops slowly when the load level is lower,while it increases when the load becomes higher. The creep strain rate on a logarithm scale as a function of strain and isochrones load-strain relations can be deduced and plotted from the testing data. From these relations the creep developing trend is evaluated. Also creep strain limitation can be determined. These researches are a base on which the prediction for long term behavior will go on.