水力发电学报
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水力发电学报 ›› 2016, Vol. 35 ›› Issue (4): 117-124.doi: 10.11660/slfdxb.20160414

• 水力发电学报 • 上一篇    下一篇

分别、分级加载下压实黄土三轴蠕变特性及模型分析

  

  • 出版日期:2016-04-25 发布日期:2016-04-25

Triaxial creep characteristics and models of remolded loess under separate and graded loading

  • Online:2016-04-25 Published:2016-04-25

Abstract: 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.

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