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冰川冻土 ›› 2018, Vol. 40 ›› Issue (1): 94-101.doi: 10.7522/j.issn.1000-0240.2018.0012

• 寒区科学与技术 • 上一篇    下一篇

非饱和粗颗粒土体的冻结试验研究

高建强1,2, 白瑞强1,2, 马勤国3   

  1. 1. 中国科学院 西北生态环境资源研究院 冻土工程国家重点实验室, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049;
    3. 华南理工大学 土木与交通学院, 广东 广州 510641
  • 收稿日期:2017-11-17 修回日期:2018-01-26 出版日期:2018-02-25 发布日期:2018-04-13
  • 通讯作者: 白瑞强,E-mail:1269977095@qq.com E-mail:1269977095@qq.com
  • 作者简介:高建强(1990-),男,甘肃靖远人,2015年在兰州交通大学获硕士学位,现为中国科学院西北生态环境资源研究院在读博士研究生,从事冻土工程数值计算分析研究.E-mail:gaojq@lzb.ac.cn
  • 基金资助:
    中国科学院前沿科学重点研究项目(QYZDY-SSW-DQC015);国家自然科学基金项目(41230630)资助

Experimental study on freezing of unsaturated coarse-grained soils

GAO Jianqiang1,2, BAI Ruiqiang1,2, MA Qinguo3   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China
  • Received:2017-11-17 Revised:2018-01-26 Online:2018-02-25 Published:2018-04-13

摘要: 按照实际工程中路基填料的级配要求配制试样,在考虑覆盖层和补水条件下进行室内单向冻结试验,开展了土质、温度梯度和温度边界条件对非饱和粗颗粒填料冻胀特性的影响研究。试验结果表明:土质、温度梯度和温度边界对粗颗粒填料的冻胀特性影响显著。其中混合细粒的冻胀量最大、黏质黄土次之、粉质黏土最小,且其对应的试样顶部、冻结锋面处的含水量及外界补水量均具有相同的大小关系。温度梯度越大,冻胀量越大,试样顶部含水量越高,但冻结锋面处的含水量变化比较小,同时外界补水量越小。试样冷端温度边界越低,冻胀量越小,试样冷端含水量越小,但外界补水量越大。

关键词: 非饱和土, 粗颗粒土, 冻胀特性, 土质, 温度

Abstract: According to the grading standards of subgrade fillings in practical engineering, some test specimens were made for one-side freezing experiments, under the consideration of impervious cover and no-pressure water supply, and for studying the influence of properties of soils, temperature gradients and boundaries on the frost susceptibility of unsaturated coarse-grained soil. The tests results showed that the properties of soils, temperature gradients and boundaries have significant influence on the frost susceptibility of coarse-grained soils. The amount of frost heaving of specimen with mixed fines is largest, following by the specimens with clay loess, and the specimens with silty clay is the minimum. The water contents in the upper position and freezing front of specimen, as well as the external water supply, have the same effect. The larger the temperature gradient, the bigger the frost heaving of specimen, resulting in more water accumulated at the top of the specimen. But the water content is less changing at the freezing front, and the external water supply is smaller. The lower the temperature boundary at the cold end, the smaller the frost heaving. In addition, the water content in the upper position decreases and the external water supply increases. As the water content in the upper position less, the external water supply will increase.

Key words: unsaturated soil, coarse-grained soil, frost susceptibility, properties of soil, temperature

中图分类号: 

  • P642.14