复杂应力路径下邓肯-张EB模型适用性研究

目前国内研究堆石体应力-应变关系特性主要是在常规三轴试验的基础上，对复杂应力路径上堆石体本构模型的验证工作尚不充分。但坝体在填筑期和蓄水期有着明显的应力路径相关性。利用堆石料常规和复杂应力路径大型三轴试验成果，对国内常用的堆石体本构模型——邓肯-张EB模型进行了验证。结果表明，邓肯-张EB模型对常规三轴试验适应性比较好；对复杂应力路径常会夸大堆石体的体积压缩变形，其加卸载准则无法正确判别一些复杂应力路径的加卸载状况。

A study of Applicability of Duncan-Chang's EB Model for Rockfill Materials Undercomplex Stress Path

The present studies on stress - strain characteristics of rockfill materials are mainly performed with the conventional triaxial test;and the verification of constitutive model under complex stress path is insufficient. Dam performs stress path correlation where in embankment fill period and storage period. In this paper we use the large scale triaxial test results of rockfill materials under complex stress path, Verification of the commonly used constitutive models -- Duncan - Chang＇s EB model,The results show that the Duncan - Chang＇s EB model performs very well under conventional triaxial test but often overestimates the volumetric compression and give incorrect loading- unloading criterion under some complex stress paths.