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冰川冻土 ›› 2014, Vol. 36 ›› Issue (5): 1199-1204.doi: 10.7522/j.issn.1000-0240.2014.0143

• 寒区科学与技术 • 上一篇    下一篇

含盐冻结粉质砂土的强度参数和强度准则试验研究

胡凯1, 赖远明2   

  1. 1. 兰州大学 西部灾害与环境力学教育部重点实验室, 甘肃 兰州 730000;
    2. 中国科学院 寒区旱区环境与工程研究所 冻土工程国家重点实验室, 甘肃 兰州 730000
  • 收稿日期:2014-02-03 修回日期:2014-05-19 出版日期:2014-10-25 发布日期:2014-11-19
  • 通讯作者: 赖远明, E-mail:ymlai@lzb.ac.cn E-mail:ymlai@lzb.ac.cn
  • 作者简介:胡凯(1988-), 男, 江西新余人, 2011年毕业于兰州大学, 现为在读硕士研究生, 从事冻土力学和寒区工程方面的研究. E-mail:huk12@lzu.edu.cn
  • 基金资助:

    国家自然科学基金项目(41230630);中国科学院“西部行动计划”项目(KZCX2-XB3-19);国家重点基础研究发展计划(973计划)项目(2012CB026102)资助

Experimental study on the strength parameters and strength criteria of saline frozen silty sand

HU Kai1, LAI Yuanming2   

  1. 1. Key Laboratory of Mechanics on Disaster and Environment in Western China of Ministry of Education, Lanzhou University, Lanzhou 730000, China;
    2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2014-02-03 Revised:2014-05-19 Online:2014-10-25 Published:2014-11-19

摘要:

对含盐冻结粉质砂土进行温度-2 ℃、-4 ℃、-6 ℃和围压0.3~16 MPa的三轴强度试验. 结果表明: 含盐冻结粉质砂土应力-应变曲线在低围压和高围压表现为应变软化特征, 中围压为理想塑性变形特性; 随着围压的增大, 强度先增加后减小. 在围压小范围内得到广义黏聚力和广义内摩擦角, 并得到广义黏聚力和广义内摩擦角随围压和温度的变化规律; 同时, 针对强度随围压的变化, 提出非线性强度准则.

关键词: 含盐冻结粉质砂土, 广义黏聚力, 广义内摩擦角, 非线性强度准则

Abstract:

In this paper, triaxial compression tests on saline frozen silty sand were done at temperature of -2, -4 and -6 ℃, respectively, and under confining pressure ranging from 0.3 to 16 MPa. The outcomes of the experiment reveal that stress-strain curves show strain softening characteristics under low confining pressures and high confining pressures, and present ideal plastic deformation characteristics under intermediate confining pressures. As confining pressure increasing, strength would in the first place increase and then drop off. The generalized cohesion and the generalized friction angle are achieved in a limited range of confining pressure by the experiment and their variations with temperature and confining pressure are attained. Finally, considering the change of strength with confining pressure, a nonlinear strength criterion is put forward.

Key words: saline frozen silty sand, generalized cohesion, generalized friction angle, nonlinear strength criterion

中图分类号: 

  • TU432