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冰川冻土 ›› 2018, Vol. 40 ›› Issue (2): 307-313.doi: 10.7522/j.issn.1000-0240.2018.0035

• 寒区科学与技术 • 上一篇    下一篇

青海北部高含盐细砂冻胀特性研究

吴亚平1, 王宁2, 潘高峰3, 李涛4   

  1. 1. 兰州交通大学 土木工程学院, 甘肃 兰州 730070;
    2. 中铁第六勘察设计院集团有限公司, 天津 300308;
    3. 西南交通大学 土木工程学院, 四川 成都 610031;
    4. 青海省地方铁路建设投资有限公司, 青海 西宁 810000
  • 收稿日期:2017-09-06 修回日期:2018-01-05 出版日期:2018-04-25 发布日期:2018-07-02
  • 通讯作者: 潘高峰,E-mail:519809916@qq.com E-mail:519809916@qq.com
  • 作者简介:吴亚平(1958-),男,浙江吴兴人,教授,2004年在中国科学院寒区旱区环境与工程研究所获博士学位,从事土木工程和工程力学等方面的教学及科研工作.E-mail:yapingwu58@126.com
  • 基金资助:
    青海省交通建设科技项目(512287);国家科技支撑计划课题(2014BAG05B05)资助

Study on the frost heaving characteristics of fine sand with high salinity in northern Qinghai

WU Yaping1, WANG Ning2, PAN Gaofeng3, LI Tao4   

  1. 1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
    2. China Railway Liuyuan Group Co., Ltd., Tianjin 300308, China;
    3. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;
    4. Qinghai Local Railway Construction Investment Co., Ltd., Xining 810000, China
  • Received:2017-09-06 Revised:2018-01-05 Online:2018-04-25 Published:2018-07-02

摘要: 为研究盐分含量和含水量对青海北部高饱和盐渍砂土冻胀特性的影响,为高盐含量地区道路设计和施工提供理论依据及参考,通过对含盐量和含水量不同的盐渍砂土进行冻胀试验,开展了对高含盐饱和细砂土的冻胀特性的试验研究,得到了含水量及含盐量对砂土冻胀量的影响规律,发现含盐细砂的起胀温度受含水量的影响不大,而主要取决于含盐量。当含盐量为5%时,起胀温度最高,然后随含盐量的增加而降低。冻胀率随着温度的降低而升高。含盐量相同时,土样的冻胀率随含水率的增加呈“S”型递增趋势。在含水量固定情况下,含盐量小于5%时,冻胀率与含盐量成正比;含盐量大于5%时,冻胀率与含盐量成反比。可用多项式拟合出冻胀率随不同含水率、含盐量的变化规律。

关键词: 青海北部, 高含盐细砂土, 含水率, 含盐量, 冻胀特性

Abstract: In order to investigate the influence of salt content and water content on the frost heaving properties of saturated fine sand with high salinity, to provide theoretical basis and reference for the design and construction of roads in the high salt content areas, an experimental study on the frost heaving properties of high salt saturated fine sand was carried out by applying frost heaving test under conditions of different water contents and different salt contents. Analyzing the influences of water content and salt content on frost heaving properties of sand specimens, it was found that the water content has little influence on the frost heave starting temperature of the salt sand, and the frost heave starting temperature mainly depends on salt content. When the salt content is 5%, the frost heave starting temperature is the highest, and then decreases with the increase of salt content. The frost heave rate increases with decreasing of temperature. Under the same salt content, the frost heaving ratio increases with increasing of water content in "S" type. When the salt content is less than 5%, the frost heaving ratio will increase with the increase of salt content. When the salt content is more than 5%, the frost heave rate will decrease slowly with the increase of salt content. Frost heave rate varying with water content and salt content can be described by a polynomial.

Key words: northern Qinghai Province, fine sand with high salinity, water content, salt content, frost heaving characteristics

中图分类号: 

  • TU445