中文摘要：

利用SR-6型三联式三轴蠕变仪对陕西省泾阳县某边坡重塑黄土进行了固结排水蠕变试验,着重研究了分别和分级两种不同加载方式下黄土的蠕变特性,确定了Burgers模型的参数,以此建立了分别和分级加载蠕变变形稳定值之间的转换经验公式以及离散元模型。结果表明：该两种加载方式下重塑黄土的整体蠕变规律一致,均呈衰减蠕变特性,而在某一定偏应力水平下,分级加载下蠕变变形稳定值大于分别加载下蠕变变形稳定值;所建Burgers模型能够较好模拟该地区压实黄土的三轴蠕变特性,基于此所建的经验转换公式能够实现分级、分别两种加载方式下最终变形稳定值的相互推算,以及所建离散元数值模型模拟效果也较好。

英文摘要：

Three sets of consolidated drained triaxial creep tests along different stress paths have been performed using a SR-6 triaxial creep deformation meter for the samples of remolded loess taken from a loess slope in Xianyang city, Shaanxi. This study focuses on loess creep characteristics along two paths, i.e. separate loading and graded loading, and determines the parameters of Burgers model to establish an empirical conversion formula of stable creep deformation between these two paths and to develop a discrete element model of creep deformation. The results indicate that the overall trends of creep deformation along the two paths were nearly the same showing a decay tendency but on a certain level of deviatoric stress, a greater stable deformation was resulted under graded loading than separate loading. Burgers model can describe the creep properties of the loess samples satisfactorily, and the values of stable deformation can be conveniently converted between the two loading paths using the conversion formula. And our simulation results of the discrete element model are also satisfactory.