›› 2018, Vol. 39 ›› Issue (9): 3270-3276.doi: 10.16285/j.rsm.2016.2609

• 基础理论与实验研究 • 上一篇    下一篇

小主应力方向加载条件下的掺砾黏土真三轴试验

张坤勇1,2,3,李 威1,3,Charkley Nai Frederick1,3,陈 恕1,3   

  1. 1. 河海大学 岩土力学与堤坝工程教育部重点实验室,江苏 南京 210098;2. 河海大学 江苏省岩土工程技术工程研究中心,江苏 南京 210098; 3. 河海大学 岩土工程科学研究所,江苏 南京 210098
  • 收稿日期:2016-11-08 出版日期:2018-09-11 发布日期:2018-10-08
  • 作者简介:张坤勇,男,1975年生,博士,副教授,硕士生导师,主要从事土的基本特性、土与结构相互作用及岩土工程数值分析等方面的教学和科研工作。
  • 基金资助:

    国家自然科学基金项目(No.41530637,No.51578214);中央高校基本科研业务费专项资金项目(No.2015B17714)

True triaxial test on clay mixed with gravel with stress increment loading from minor principal stress direction

ZHANG Kun-yong1,2,3, LI Wei1,3, Charkley Nai Frederick1,3, CHEN Shu1,3   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing, Jiangsu 210098, China; 3. Institute of Geotechnical Engineering, Hohai University, Nanjing, Jiangsu 210098, China
  • Received:2016-11-08 Online:2018-09-11 Published:2018-10-08
  • Supported by:

    This work was supported by the National Natural Science Foundation of China(41530637, 51578214) and the Fundamental Research Funds for the Central Universities(2015B17714).

摘要: 对土石坝心墙掺砾黏土开展模拟心墙单元小主应力方向加载的真三轴试验,首先对试样进行不同围压条件下等向固结,然后保持小主应力恒定,通过调整大主应力和中主应力,以模拟土石坝竣工后的初始三向应力状态。试验过程中保持大主应力和中主应力恒定,从小主应力方向单向加载,以模拟土石坝蓄水过程中心墙单元所经历的应力路径。试验结果与常规三轴试验以及复杂应力条件下大主应力方向真三轴加载试验结果都有显著不同。不同初始应力条件下,不同主应力方向的初始切线模量和初始切线泊松比的变化规律非常复杂,应力–应变显现出明显的各向异性。在心墙堆石坝施工过程及蓄水过程中,心墙单元所经历的应力路径明显不同,合理的土体本构模型应该对这种由于加荷路径不同所引起的不同方向模量和泊松比进行合理描述。

关键词: 真三轴试验, 小主应力, 各向异性, 掺砾黏土, 应力路径

Abstract: True triaxial tests on clay mixed with gravel were carried out under complex stress state to simulate the loading process of core wall elements under water storage process, and loading was applied from the minor principal stress direction. Under initial state, the major principal stress and the second principal stress were adjusted with constant minor principal stress; initial anisotropic stress state was reached to simulate the stress state of dam elements. The major principal stress and second principal stress were then kept constant. Minor principal stress increment was applied to simulate the stress path that core wall elements go through during the process of water storage. Test results show significant differences compared with the result of conventional triaxial tests and true triaxial tests loading from major principal stress direction. Under different initial stress conditions, the initial tangent modulus and initial Poisson’s ratio of the principal stress direction are very complex, and the stress - strain curve shows obvious anisotropy. In the process of core wall rockfill dam construction and the water storage process, the stress path experienced by the core wall unit is obviously different. The reasonable soil constitutive model should be used to describe the modulus and Poisson’s ratios caused by the different loading paths.

Key words: true triaxial test, minor principal stress, anisotropy, clay mixed with gravel, stress path

中图分类号: 

  • TU411
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