工程力学 ›› 2019, Vol. 36 ›› Issue (3): 114-120,130.doi: 10.6052/j.issn.1000-4750.2018.01.0072

• 土木工程学科 • 上一篇    下一篇

不同应力路径下堆石料的动力变形特性试验研究

张凌凯1, 王睿2, 张建民2, 唐新军1   

  1. 1. 新疆农业大学水利与土木工程学院, 新疆, 乌鲁木齐 830052;
    2. 清华大学水沙科学与水利水电工程国家重点实验室, 北京 100084
  • 收稿日期:2018-01-25 修回日期:2018-04-08 出版日期:2019-03-29 发布日期:2019-03-16
  • 通讯作者: 张建民(1960-),男,陕西人,教授,博士,博导,主要从事岩土工程方面的教学和研究(E-mail:zhangjm@tsinghua.edu.cn). E-mail:zhangjm@tsinghua.edu.cn
  • 作者简介:张凌凯(1987-),男,山西人,博士生,主要从事堆石料静动力特性及本构模型方面的研究(E-mail:xjau_zlk@163.com);王睿(1987-),男,陕西人,助理研究员,博士,主要从事岩土工程抗震方面的研究(E-mail:wangrui_05@tsinghua.edu.cn);唐新军(1959-),男,陕西人,教授,博士,博导,主要从事当地材料坝设计理论方面的研究(E-mail:tangxj59@163.com)
  • 基金资助:
    水沙科学与水利水电工程国家重点实验室科研课题项目(2018-KY-04);国家自然科学基金项目项目(51678346,51708332)

EXPERIMENTAL STUDY ON DYNAMIC DEFORMATION CHARACTERISTICS OF ROCKFILL MATERIALS UNDER DIFFERENT STRESS PATHS

ZHANG Ling-kai1, WANG Rui2, ZHANG Jian-min2, TANG Xin-jun1   

  1. 1. College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China;
    2. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
  • Received:2018-01-25 Revised:2018-04-08 Online:2019-03-29 Published:2019-03-16

摘要: 采用大型多功能静动三轴试验机,对堆石料分别进行了常规三轴循环加载、等p循环加载和等q循环加载三种不同应力路径下的动力变形试验研究,探讨了不同应力路径下围压﹑固结应力比及动应力比等因素对体应变和偏应变的影响规律及其变形机制。试验结果表明:在循环荷载作用下,不同应力路径对堆石料体应变和偏应变的发展规律影响较大;在等p循环加载作用下引起的往返体应变为负值,即发生剪胀现象,且在轴向剪切时达到最大剪胀值,反向剪切时基本不发生剪胀;在等q循环加载作用下产生较大的残余体应变和残余偏应变,两者均不可忽略不计,主要与堆石料的各向异性和颗粒破碎有关。

关键词: 应力路径, 堆石料, 体应变, 偏应变, 变形机制

Abstract: Dynamic deformation experiments of rockfill materials were carried out by using the large-scale triaxial apparatus, such as the conventional triaxial cyclic loading, the p=const cyclic loading and the q=const cyclic loading. The influence and deformation mechanisms of confining pressure, consolidation stress ratio and dynamic stress ratio on the volumetric strain and deviatoric strain were discussed. The test results indicated that different stress paths had a great influence on the development pattern of the volumetric strain and deviatoric strain under the cyclic loading. The reciprocating volumetric strain was negative under the p=const cyclic loading, indicating dilatancy with its maximum dilatancy occurring in the axial shearing, while the shear dilatancy did not show in the reverse shearing. The large residual volumetric strain and residual deviatoric strain were produced under the q=const cyclic loading, which were not negligible, and it was mainly related to the anisotropy and particle breakage of the rockfill materials.

Key words: stress path, rockfill materials, volumetric strain, deviatoric strain, deformation mechanism

中图分类号: 

  • TU411.8
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