土工格栅低温下蠕变特性试验研究

土工格栅蠕变特性是影响土工格栅加筋结构长期工作性能的重要因素。通过室内蠕变试验，对土工格栅的低温蠕变特性进行了试验研究，结果表明，塑料土工格栅在低温下蠕变特性与常温下明显不同，20 ℃常温状态下1 000 h后，当伸长率接近14 %时且60 % Pmax（Pmax为断裂强度）下，变形仍没有稳定迹象，而在同等荷载下-20 ℃低温状态时，仅100余小时，变形就趋于稳定，且伸长率不足2.5 %。结果表明塑料土工格栅蠕变性能受温度影响很大，并且温度越低蠕变值越小。

Research on creep property of geogrids at a low temperature

Creep property is the key factor effecting long-term behavior of geogrid-reinforced earth retaining structures. Contrast test is adopted for creep property of geogrids under different temperatures in the indoor test. The result indicates as follows: creep property of plastic geogrids is totally different with different temperatures. When extensibility is approaching 14 % after 1 000 hours at 20 ℃, the deformation is still not becoming stability under 60 percent of max-pressure. However, under the circumstance of -20 ℃, when the extensibility falls short of 2.5 % after only 100 hours, the deformation reaches stability. So temperature has a great influence on creep property of geogrids. The lower the temperature is, the smaller the creep is.