加速土工合成材料蠕变试验的荷载叠加法

根据自由体积理论证明了温度、应力与分子运动的关系,在分析了时温叠加法原理的基础上,阐述了荷载叠加法的原理,提出了加速土工合成材料蠕变试验和预测其长期特性的荷载叠加法和荷载转移公式因子。对RS50土工格栅的室内蠕变试验结果作了分析,利用荷载叠加法把几种不同荷载水平下的蠕变试验曲线形成了几条光滑的主曲线。由此得出了设计使用年限下的应力-应变曲线,计算出了RS50格栅的蠕变折减系数,为工程设计提供了依据。

Load superposition for accelerating creep test of geosynthetics

The relationship of temperature and stress to molecular motion was approved according to the free volume theory in this paper.On the basis of time-temperature superposition,the principle,shift formula and factor of load superposition were represented,which could accelerate creep test of geosynthetics and predict its long term behaviour.The laboratory creep test of geogrid RS50 were analyzed.Smooth primary curves were formed with the help of creep test curves at different load levels through load superposition method.Stress-strain curves at the end of designed life and creep reduction factor of geogrid RS50 are determined,which could be used as reference for engineering design.