水利水电技术（中英文）2024，Vol.55Issue(1)：180-190,11.DOI:10.13928/j.cnki.wrahe.2024.01.016
冻融循环作用下粉砂质硫酸盐渍土变形特性研究
Study on deformation characteristics of silty sulfate soil under freeze-thaw cycle
摘要
Abstract
[Objective]In order to explore the deformation characteristics of silty sulfate soil in southern Xinjiang,[Methods]The freeze-thaw cycle test of silty soil was carried out under closed system conditions,and the soil structure was characterized and analyzed by scanning electron microscopy.[Results]The result showed that the deformation was mainly melt and precipitation when the sodium sulfate content of silty sulfate soil was 0 and 1.0％,and the deformation was-1.30 mm and-1.02 mm after five cycles,respectively.When the sodium sulfate content was 2.0％,5.0％and 8.0％,the deformation was salt expansion-frost heave deformation,and the deformation after five cycles was 2.46 mm,8.53 mm and 3.43 mm,respectively.[Conclu-sion]The result show that the temperature and sodium sulfate content of silty sulfate soil under freeze-thaw cycle are the main fac-tors affecting the freeze-thaw deformation of soil.The deformation of soil in the low temperature interval is manifested as salt expansion-frost heave with the decrease of temperature,and ice melting and salt dissolution deformation occur successively in the process of heating.When the sodium sulfate content is 5.0％,the salt-frost heave rate of the soil reaches a maximum of 2.5％.Using scanning electron microscopy,it can be found that silty sulfate soils will settle under their own weight after freeze-thaw cycles,and internal salt re-crystallization is the main reason for inhibiting settlement and even causing soil expansion.关键词
粉砂质硫酸盐渍土/冻融循环作用/盐-冻胀变形/微观结构/变形Key words
silty sulfate soil/freeze-thaw cycle action/salt-frost heave deformation/micro-structure/deformation分类
建筑与水利引用本文复制引用
江建兵,杨晓松,肖旻,马兵,张占武,杨保存..冻融循环作用下粉砂质硫酸盐渍土变形特性研究[J].水利水电技术（中英文）,2024,55(1):180-190,11.基金项目
国家自然科学基金项目(51869029,51641903,52068062) （51869029,51641903,52068062）
江西省教育厅科学技术研究项目(GJJ190621) （GJJ190621）
新疆生产建设兵团一师横向项目(SWJ2022KT23) （SWJ2022KT23）
塔里木大学校长基金(TDZKSS202151) （TDZKSS202151）
