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冰川冻土 ›› 2014, Vol. 36 ›› Issue (6): 1479-1483.doi: 10.7522/j.issn.1000-0240.2014.0176

• 寒区科学与技术 • 上一篇    下一篇

深部人工冻结黏土三轴蠕变试验研究

王伸远, 李栋伟   

  1. 安徽理工大学 土木建筑学院, 安徽 淮南 232000
  • 收稿日期:2014-04-16 修回日期:2014-10-10 出版日期:2014-12-25 发布日期:2015-01-20
  • 作者简介:王伸远(1990-),男,山东聊城人,2012年毕业于山东理工大学,现为安徽理工大学在读硕士研究生,主要从事人工冻土本构模型研究工作.E-mail:1067329532@qq.com
  • 基金资助:
    国家自然科学基金项目(41271071); 教育部新世纪优秀人才基金项目(NCET-887)资助

Experimental study of the triaxial creep features of deep artificial frozen clay

WANG Shenyuan, LI Dongwei   

  1. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232000, Anhui, China
  • Received:2014-04-16 Revised:2014-10-10 Online:2014-12-25 Published:2015-01-20

摘要: 通过将试样等向固结再冻结, 然后保持轴压不变进行径向卸载的实验方法, 获得深部冻结黏土在复杂应力状态下的蠕变变形规律. 对冻黏土进行了大量的三轴蠕变试验, 得到了在冻结温度不同和固结围压不同条件下的蠕变试验结果. 结果表明: 在较低的偏应力水平下, 试样只发生前两个阶段的蠕变变形, 且蠕变变形量超过总变形量的70%; 当试样偏应力值高于某一临界值时会出现加速蠕变阶段, 蠕变变形量超过总变形量的80%. 可以用改进的Zienkiewicz-Pande抛物线型屈服准则来描述加速蠕变阶段的临界应力.

关键词: 人工冻土, 固结围压, 偏应力, 三轴蠕变试验

Abstract: A clay triaxial creep test, in which the specimen was first isotropic consolidated and frozen under low temperature and then radial unloaded with constant axial compression, was carried out to get the creep deformation law of deep frozen clay under complex stress state. Through a lot of tests, the creep features under different freezing temperatures and different confining pressures were obtained. When the deviatoric stress levels were low, only the first two creep stages occurred and the creep deformation was over 70% of the total deformation. There will be an accelerated creep stage when the deviatoric stress levels were higher than a critical value, and the creep deformation will be over 80% of the total deformation. The critical stress in accelerated creep stage could be described by the improved Zienkiewicz-Pande parabolic yield criterion.

Key words: artificially frozen soil, consolidated surrounding pressure, deviation stress, triaxial creep test

中图分类号: 

  • P642.14