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非饱和膨润土失水收缩与冻结体变关系研究

刘振亚, 刘建坤, 李旭, 房建宏

刘振亚, 刘建坤, 李旭, 房建宏. 非饱和膨润土失水收缩与冻结体变关系研究[J]. 岩土工程学报, 2018, 40(S1): 229-234. DOI: 10.11779/CJGE2018S1037
引用本文: 刘振亚, 刘建坤, 李旭, 房建宏. 非饱和膨润土失水收缩与冻结体变关系研究[J]. 岩土工程学报, 2018, 40(S1): 229-234. DOI: 10.11779/CJGE2018S1037
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LIU Zhen-ya, LIU Jian-kun, LI Xu, FANG Jian-hong. Experimental study on air-dried shrinkage and frozen deformation characteristics of unsaturated bentonite[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(S1): 229-234. DOI: 10.11779/CJGE2018S1037
Citation: LIU Zhen-ya, LIU Jian-kun, LI Xu, FANG Jian-hong. Experimental study on air-dried shrinkage and frozen deformation characteristics of unsaturated bentonite[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(S1): 229-234. DOI: 10.11779/CJGE2018S1037
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非饱和膨润土失水收缩与冻结体变关系研究  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）; 上海市科学技术委员会科研计划项目（16DZ1200503）
详细信息
    作者简介:

    刘振亚(1985- ),男,博士,主要从事冻土路基方面的研究工作。E-mail：zhya_liu@163.com。

    通讯作者:

    李旭，E-mail：ceXuLi2012@163.com

  • 中图分类号: TU411

Experimental study on air-dried shrinkage and frozen deformation characteristics of unsaturated bentonite

  • 1. Key Laboratory of Urban Underground Engineering of Ministry of Education, 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: 与饱和膨润土呈现冻胀现象不同,非饱和膨润土在冻结过程中体缩现象显著,其体缩可能与其失水收缩和冰水相变后产生的冰晶胶结作用有关。为探究非饱和膨润土的冻结体变特征,进行了不同初始孔隙比、饱和度下的三维等温体变试验、常温风干试验。试验结果表明：非饱和膨润土冻结温度低于粉质黏土,和其初始含水率正相关;非饱和膨润土在冻融循环中存在低密度土体被压密,高密度土体密度减小的现象。非饱和膨润土在冻结过程中,低饱和度土样存在明显的体缩现象,随着饱和度的提高,其体缩现象逐步消失直至出现明显冻胀;这种现象说明：冻结过程中,不仅存在冰水相变引起的冻胀作用,而且还存在着由于冰水胶结而产生的体缩作用;通过进一步的数据分析,得到了冰水相变导致的体变与土体体积含冰量之间的关系,它综合反映了饱和度、孔隙比、温度等因素对非饱和膨润土冻结体变特性的影响。
    Abstract: Saturated bentonite swells during freezing while unsaturated bentonite may shrink during freezing, which may be related to the water loss-induced shrinkage and ice-water phase transition-induced expansion. In order to investigate the contribution of these two parts, the bentonite samples with various void ratios and degrees of saturation are examined using the frozen deformation tests, air-dried shrinkage tests and freezing point tests. The test results demonstrate that the freezing point of the unsaturated bentonite mainly depends on its gravimetric water content and is much larger than that of unsaturated silt clay. The sample with high density becomes loose and the one with low density becomes dense after being frozen. The bentonite samples with low degree of saturation, i.e., 0.4, 0.5, 0.6, 0.7, shrink, whereas the sample with high degree of saturation (0.9) swells after being frozen. A linear relationship is found between the volumetric ice content and the ice-water phase transition-induced volumetric deformation, which is a comprehensive reflection of the influence of degree of saturation, void ratio and temperature on the deformation of unsaturated bentonite.
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出版历程
  • 收稿日期:  2017-06-10
  • 发布日期:  2018-08-24

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