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冰川冻土 ›› 2016, Vol. 38 ›› Issue (2): 424-430.doi: 10.7522/j.issn.1000-0240.2016.0047

• 寒区科学与技术 • 上一篇    下一篇

冻结粉质黏土三轴抗压强度和变形特性试验研究

牛亚强1, 赖远明1 2, 王旭1, 廖孟柯2, 高娟2   

  1. 1. 兰州交通 大学土木工程学院, 甘肃 兰州 730070;
    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:2015-10-13 修回日期:2015-10-13 出版日期:2016-04-25 发布日期:2016-07-13
  • 作者简介:牛亚强(1988-),男,甘肃平凉人,2013年在兰州交通大学获硕士学位,现为兰州交通大学在读博士研究生,主要从事路基工程、岩土工程方面的研究.E-mail:niuyq_1377@163.com
  • 基金资助:
    国家重点基础研究发展计划(973计划)项目(2012CB026102);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)资助

Experimental study on triaxial compressive strength and deformation behaviors of frozen silty clay

NIU Yaqiang1, LAI Yuanming1 2, WANG Xu1, LIAO Mengke2, GAO Juan2   

  1. 1. School of Civil Engineering, Lanzhou Jiaotong 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:2015-10-13 Revised:2015-10-13 Online:2016-04-25 Published:2016-07-13

摘要: 通过对-6℃冻结粉质黏土在1~9 MPa的围压范围内进行一系列的三轴压缩试验,分析了冻土的变形和强度特性.结果表明:不同围压下,冻结粉质黏土的应力-应变曲线形态基本相似,而软化程度及初始阶段的硬化速率则有所不同.根据摩尔-库仑准则,得到广义黏聚力和广义内摩擦角随围压的变化规律,同时基于包络线理论建立非线性强度准则,以描述冻结粉质黏土强度随围压先增大后减小的变化规律.

关键词: 冻结粉质黏土, 变形规律, 强度特性, 试验研究

Abstract: In order to study the deformation and strength behaviors of frozen silty clay, a series of triaxial compression tests were conducted under confining pressure from 1 MPa to 9 MPa at -6℃. The results show that the shapes of stress-strain curves are similar under different confining pressures, while the hardening rate at the initial phase and the softening degree are different. According to Mohr-Coulomb criterion, the variation of generalized cohesion and internal friction angle with confining pressures are calculated from the experimental results, meanwhile, a nonlinear strength criterion is put forward based on the envelope theory to describe the strength of frozen silty clay increases at first then decreases with the increasing of confining pressure.

Key words: frozen silty clay, deformation law, strength behaviors, experimental study

中图分类号: 

  • TU445