Time-dependent stress–strain behaviour due to viscous properties of geogrid reinforcement
Time-dependent stress–strain behaviour due to viscous properties of geogrid reinforcement
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DOI：
10.1680/gein.2003.10.6.176
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发表时间：
2003-12
影响因子：
4.5
通讯作者：
D. Hirakawa;W. Kongkitkul;F. Tatsuoka;T. Uchimura
中科院分区：
文献类型：
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作者：
D. Hirakawa;W. Kongkitkul;F. Tatsuoka;T. Uchimura
对六种土工合成材料加筋体进行了一系列常规和非常规拉伸试验，以评估其粘性特性。它表明，等效模型，根据该模型的负载（或应力）是一个独特的函数的瞬时应变和经过的时间，是无法解释的主要粘性方面的测试结果。特别是该模型是无法预测的应力-应变行为和断裂强度加载后，重新开始在一个恒定的应变速率蠕变加载或应力松弛阶段。有人认为，广泛流行的概念，蠕变是一种退化现象，需要设计强度降低，增加设计寿命是不现实的典型的现场条件下，应力-应变性能不随时间明显恶化。也有人认为，这一概念源于等值线模型。提出了一个非线性三分量模型来模拟粘性方面。
A series of conventional and unconventional tensile tests were performed on six types of geosynthetic reinforcement to evaluate their viscous properties. It is shown that the isochronous model, according to which the load (or the stress) is a unique function of instantaneous strain and elapsed time, is unable to explain the major viscous aspects of the test results. In particular the model is unable to predict the stress–strain behaviour and rupture strength observed after loading is restarted at a constant strain rate following a creep loading or stress relaxation stage. It is argued that the widely prevailing concept that creep is a degrading phenomenon requiring the design strength to be reduced with an increase in the design lifetime is not realistic under typical field conditions where the stress–strain property does not deteriorate noticeably with time. It is also argued that this concept stems from the isochronous model. A non-linear three-component model is proposed to simulate the viscous aspects...