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冰川冻土 ›› 2013, Vol. 35 ›› Issue (2): 369-375.doi: 10.7522/j.issn.1000-0240.2013.0044

• 寒区科学与技术 • 上一篇    下一篇

高温-高含冰量冻土压缩变形特性研究

苏凯, 张建明, 刘世伟, 张虎, 阮国锋   

  1. 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:2012-12-28 修回日期:2013-03-18 出版日期:2013-04-25 发布日期:2013-05-14
  • 通讯作者: 张建明,E-mail:zhangjm@lzb.ac.cn E-mail:zhangjm@lzb.ac.cn
  • 作者简介:苏凯(1987-), 男, 福建漳州人, 2010年毕业于西安理工大学, 现为中国科学院寒区旱区环境与工程研究所硕士研究生, 主要从事冻土力学与寒区工程等方面的研究工作. E-mail: sukai0596@163.com
  • 基金资助:

    国家自然科学基金项目(40971045; 41023003);冻土工程国家重点实验室自主项目(SKLFSE-ZY-02-6)资助

Compressibility of Warm and Ice-Rich Frozen Soil

SU Kai, ZHANG Jian-ming, LIU Shi-wei, ZHANG Hu, RUAN Guo-feng   

  1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid regions Environmental and EngineeringResearch Institute, Chinese Academy of Sciences, Lanzhou Gansu 730000, China
  • Received:2012-12-28 Revised:2013-03-18 Online:2013-04-25 Published:2013-05-14

摘要:

高温-高含冰量冻土属于塑性冻土, 荷载作用下具有较强的压缩性.为了研究高温-高含冰量冻土的压缩变形特性, 采用恒温-变载的试验方法得到了不同温度(-0.3、 -0.5、 -0.7、 -1.0、 -1.5℃), 不同含水量(40%、 80%、 120%)条件下冻土试样的体积压缩系数.结果表明: 1)高温-高含冰量冻土具有极大的压缩性, 青藏黏土40%含水量试样在-0.3℃时的体积压缩系数可达0.328 MPa-1, 属于高压缩性土; 2)高温-高含冰量冻土在压缩过程中存在渗滤变形, 且主要发生于加载的初始阶段; 3)温度与含冰量是影响高温-高含冰量冻土压缩性的主要因素, 它们决定了冻土中体积未冻水的含量, 从而控制了冻土的压缩性; 4)在试验条件下, 高温-高含冰量冻土的压缩性随着温度的升高而增大, 随着含水量的增大而减小.高温时含水量对压缩性的影响比较显著, 低温时影响较小.

关键词: 高温-高含冰量冻土, 体积压缩系数, 未冻水含量, 渗滤变形

Abstract:

Warm and ice-rich frozen soil belongs to plastic frozen soil, of which the compressibility is remarkable under loading. In order to study the compressive properties of the warm and ice-rich frozen soil, compression tests under constant temperature and stepped load were conducted at temperatures of -0.3, -0.5, -0.7, -1.0, -1.5℃ andwith water contents of 40%, 80%, 120%, respectively. Then the volume compressibility coefficients were obtained. The test results indicate that: The compressibility of the soil is considerable. For example, the volume compressibility coefficient of the clay specimen at -0.3℃ with water content of 40% could reach to 0.328 MPa-1, which belongs to high compressibility soil. 2) exists in the soil during the process of compression, and mostly occurs in the initial stage of loading. 3) Temperature and water content of the soil, which control the volumetric unfrozen water content, are the most important factors to impact the compressibility. 4) Under the test conditions mentioned above, the compressibility of the soil increases with temperature rising and water content decreasing. When the temperature is higher, the effect of water content on the compressibility is remarkable, but it is not obvious when the temperature is relatively low.

Key words: warm and ice-rich frozen soil, coefficient of volume compressibility, volumetric unfrozen water content

中图分类号: 

  • P642.14