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为了探讨黄土的流变特性,对西安地区的原状黄土进行了三组室内流变特性试验,第1组四个试样进行的是分别加载蠕变试验,第2组二个试样进行的是分级加载试验,第3组二个试样进行的是加载—卸载—再加载蠕变试验。试验发现:(1)在侧限状态下,黄土蠕变过程中的变形由瞬时弹性变形、瞬时塑性变形、粘性变形和粘性流动变形组成;(2)黄土试样受荷的瞬时所产生的瞬时塑性变形占有瞬时总变形的一定比值。最后,基于以上试验结果,对黄土的流变机理进行了分析,并提出了一个适用于黄土的可以考虑瞬时塑性变形的流变模型。
In order to investigate the rheological properties of loess, three groups of indoor rheological properties tests were carried out on undisturbed loess in Xi’an. The first group of four specimens were subjected to loading creep test respectively. The second group of two specimens were subjected to Fractional loading test, the third group of two samples are loaded - unloading - reloading creep test. The results show that: (1) In the confined state, the deformation of loess during creep deformation consists of instantaneous elastic deformation, instantaneous plastic deformation, viscous deformation and viscous flow deformation. (2) The instantaneous moment Plastic deformation occupies a certain ratio of total instantaneous deformation. Finally, based on the above experimental results, the rheological mechanism of loess is analyzed and a rheological model suitable for transient plastic deformation of loess is proposed.