岩土工程学报2017，Vol.39Issue(11)：1992-2001,10.DOI:10.11779/CJGE201711006
单向冻结过程中NaCl盐渍土水盐运移及变形机理研究
Water and salt migration and deformation mechanism of sodium chloridesoil during unidirectional freezing process
摘要
Abstract
The mechanism of water and salt migration in the freezing process has long been a hot spot in the study of frozen soil. The water and salt transport processes and the deformation of soil are studied through the unidirectional freezing experiments. The results show that the deformation of soil with the initial salt content decreases significantly compared with that of desalinized soil, and the salt has a strong impact on the accumulation of water in the frozen fringe, and it can mitigate the frost heave of soil in the freezing process. Supplied with different concentrations of NaCl solution, the deformations of the samples are consistent in the early stage. With the accumulation of salt at the freezing front, the driving force of moisture migration is not so sufficient during the subsequent period when the frost heave decreases significantly. Based on the properties of the solution, a model is established to describe the water and salt migration and deformation in the freezing process, where the influence of salt on the freezing temperature and unfrozen water content are considered. The calculated results illustrate that the proposed model can reflect the laws of temperature, water, salt and deformation in the freezing process well, and it will provide a theoretical basis for understanding the deformation mechanism of saline freezing soil.关键词
盐渍土/单向冻结试验/水盐迁移/变形Key words
saline soil/unidirectional freezing experiment/water and salt migration/deformation分类
建筑与水利引用本文复制引用
肖泽岸,赖远明,尤哲敏..单向冻结过程中NaCl盐渍土水盐运移及变形机理研究[J].岩土工程学报,2017,39(11):1992-2001,10.基金项目
国家自然科学基金重点项目(41230630) （41230630）
中国科学院前沿科学重点研究项目(QYZDY-SSW-DQC015) （QYZDY-SSW-DQC015）
国家自然科学青年基金项目(41601074) （41601074）
中科院寒旱所冻土工程国家重点实验室自主课题(SKLFSE-ZQ-32) （SKLFSE-ZQ-32）
