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非饱和粉质黏土冻结温度和冻结变形特性试验研究

刘振亚, 刘建坤, 李旭, 房建宏

刘振亚, 刘建坤, 李旭, 房建宏. 非饱和粉质黏土冻结温度和冻结变形特性试验研究[J]. 岩土工程学报, 2017, 39(8): 1381-1387. DOI: 10.11779/CJGE201708004
引用本文: 刘振亚, 刘建坤, 李旭, 房建宏. 非饱和粉质黏土冻结温度和冻结变形特性试验研究[J]. 岩土工程学报, 2017, 39(8): 1381-1387. DOI: 10.11779/CJGE201708004
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LIU Zhen-ya, LIU Jian-kun, LI Xu, FANG Jian-hong. Experimental study on freezing point and deformation characteristics of unsaturated silty clay subjected to freeze-thaw cycles[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(8): 1381-1387. DOI: 10.11779/CJGE201708004
Citation: LIU Zhen-ya, LIU Jian-kun, LI Xu, FANG Jian-hong. Experimental study on freezing point and deformation characteristics of unsaturated silty clay subjected to freeze-thaw cycles[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(8): 1381-1387. DOI: 10.11779/CJGE201708004
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非饱和粉质黏土冻结温度和冻结变形特性试验研究  English Version

  • 1. 北京交通大学城市地下工程教育部重点实验室,北京 100044;
    2. 多年冻土地区公路建设与养护技术交通行业重点实验室青海研究观测基地,西宁 青海 810001

基金项目: 国家自然科学基金项目（51479001,41471052）; 中央高校; 基本科研业务费专项项目（2014JBZ013）; 北京市自然科学基金项目（8152024）
详细信息
    作者简介:

    刘振亚(1985- ),男,博士研究生,主要从事冻土路基变形等的相关研究工作。E-mail: zhya_liu@163.com。

    通讯作者:

    李旭，E-mail：ceXuLi2012@163.com

Experimental study on freezing point and deformation characteristics of unsaturated silty clay subjected to freeze-thaw cycles

  • 1. Beijing Jiaotong University, Beijing 100044, China;
    2. Qinghai Research and Observation Base, Key Laboratory of Highway Construction & Maintenance Technology in Permafrost Regions, Ministry of Transport, Xining 810001, China;

摘要

    摘要
  • 摘要: 为掌握冻土冻结变形规律,揭示冻结变形机理,采用自行研制的温控体变仪精确测量不同饱和度、孔隙比土样的冻结变形,为计算冻土的体积含冰量,对非饱和粉质黏土冻结温度进行了测量。室内试验结果及其数据分析表明：①非饱和粉质黏土冻结温度（冰点）主要由土样初始基质吸力决定,基质吸力越大,冻结温度越低。②非饱和粉质黏土冻结变形随饱和度变化存在两种截然不同的机制,饱和度较低时,冰水相变影响较小,土体呈冻缩特征;饱和度较高时,冰水相变占主导作用,导致土体结构破坏,呈冻胀特征。③非饱和粉质黏土冻结体应变与土体体积含冰量和初始孔隙比具有良好的经验关系,可以基于体积含冰量和初始孔隙比预测土体冻结体应变,其中体积含冰量由土体冻结温度、温度、饱和度、干密度计算得到。
    Abstract: To obtain a predictive model of freezing deformation, three-dimension deformational tests are carried out to study the deformation characteristics of samples with various degrees of saturation and void ratios. To obtain the ice content in frozen soils, the freezing points of soils are also measured. The test results demonstrate that: (1) The freezing point of soils is mainly dependent on the initial matric suction of soils. (2) There are two different deformation phenomena for soils after being frozen: one is the frozen shrinkage if the degree of saturation of soils is low, the other is the frozen expansion if the degree of saturation is high. (3) The volumetric strains of soils after being frozen have a linear empirical relation with the ratio of volumetric ice content to initial void ratio of soils, where the volumetric ice content of soils can be calculated by the degree of saturation, freezing point, temperature and dry density of soils.
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    • 参考文献(21)
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出版历程
  • 收稿日期:  2017-01-19
  • 发布日期:  2017-08-24

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