Model test study of water and salt migration and deformation characteristics in seasonally frozen soil

doi:10.16285/j.rsm.2016.02.020

	Model test study of water and salt migration and deformation characteristics in seasonally frozen soil
	Wu, Dao-Yong; Lai, Yuan-Ming; Ma, Qin-Guo; Wang, Chong
刊名	岩土力学
	2016-02-10
卷号	37 期号:2 页码:465-476
关键词	季节冻土盐分迁移变形特性模型试验
ISSN号	1000-7598
DOI	10.16285/j.rsm.2016.02.020
其他题名	季节冻土区水盐迁移及土体变形特性模型试验研究
文献子类	Article
英文摘要	In order to investigate the law of water and salt migration, understand the deformation characteristics of saline frozen soil, and explore the mechanism of soil salinization in cold and arid regions, a model test of silty clay with different salinities is carried out. Results indicate that the temperature, water, salt and deformation of the saline frozen soil are coupling with each other. The temperature reduction is advantageous to precipitate the salt crystals and freeze the unfrozen water, while the temperature rise is liable to dissolve the salt crystals and thaw the ice. Heat release or absorption during the phase change of salt and water influences the soil temperature. Salt influences the water content significantly by changing the dynamic viscosity of the fluid and freezing temperature the soil, and generating a great suction when salt crystals precipitate from the supersaturated solution. Salt migrating with unfrozen water in ionic form means that water is the medium for salt migration. Salt and water are moving upward to the surface during cooling period, while the opposite direction is observed during warming period. The migration rate is related to the soil suction, and the greatest soil suction in the freezing fringe results in the fastest migration velocity. The deformation of saline frozen soil is the result of the combined effect of salt and water. Frost heave and thaw settlement caused by water freezing and thawing are the mainly deformation of saline frozen soil with low salinity, while salt heave and dissolve settlement caused by salt crystallization and dissolution play the dominant role with high salinity. © 2016, Academia Sinica. All right reserved.
学科主题	Water Resources ; Soils And Soil Mechanics ; Chemical Operations
出版地	Wuhan
资助项目	国家自然科学基金项目 ; 国家重点基础研究发展计划以及国家重大科学研究计划（973计划）
项目编号	国家自然科学基金重点资助项目 ; 中国科学院西部行动计划项目 ; 国家重点基础研究计划(973)项目
语种	中文
CSCD记录号	CSCD:5627838
资助机构	NSFC ; MOST
内容类型	期刊论文
源URL	[http://ir.lzu.edu.cn/handle/262010/182499]
专题	土木工程与力学学院_期刊论文
推荐引用方式 GB/T 7714	Wu, Dao-Yong,Lai, Yuan-Ming,Ma, Qin-Guo,et al. Model test study of water and salt migration and deformation characteristics in seasonally frozen soil[J]. 岩土力学,2016,37(2):465-476.
APA	Wu, Dao-Yong,Lai, Yuan-Ming,Ma, Qin-Guo,&Wang, Chong.(2016).Model test study of water and salt migration and deformation characteristics in seasonally frozen soil.岩土力学,37(2),465-476.
MLA	Wu, Dao-Yong,et al."Model test study of water and salt migration and deformation characteristics in seasonally frozen soil".岩土力学 37.2(2016):465-476.