摘要
由于水盐迁移而引发的土壤盐渍化现象极为明显,而目前关于不同供给源下水盐迁移特性的研究不多,制约了低液限粉土路基结构设计.根据新疆盐渍土地区的实际工况,选择氯盐为研究对象,考虑水盐供给源的影响,通过室内土柱试验对低液限粉土路基的水盐迁移规律展开研究.结果表明:低液限粉土的水盐迁移过程在达到平衡状态后,会在土体中形成水盐积聚层;水分迁移是引起盐分迁移的最主要因素;当盐分由底部盐溶液供给时,15 d的迁移高度就达130 cm;当盐分单纯由盐渍土供给时,则迁移现象不显著,因此低液限粉土路基不宜用于地下水位较浅的盐渍土地区,且阻断地下水能够有效降低水盐迁移水平.
The soil salinization caused by water salt migration is very obvious,but there are no research results on the characteristics of water salt migration under different supply sources,which restricts the structure design of low liquid limit silt subgrade.According to the actual working conditions in saline soil area of Xinjiang,chlorine salt is selected as the research object,considering the influence of water and salt supply source,the water and salt migration law of low liquid limit silty clay subgrade is studied by indoor soil column test.The results show that:the water-salt accumulation layers will be formed in soil after the water-salt migration process of low liquid limit silt reaches equilibrium state;water migration is the most important factor of salt migration;if salt is supplied by bottom salt solution,the migration height of 15 d is 130 cm;if salt is supplied by artificial saline soil,the migration phenomenon is not obvious,so low liquid limit silt subgrade should not be used in saline soil area with shallow groundwater level and blocking groundwater can reduce water-salt migration level effectively.The research results can provide some theoretical basis and technical support for the design of low liquid limit silt subgrade structure.
作者
冉武平
李爽
王亚强
孙誉
RAN Wuping;LI Shuang;WANG Yaqiang;SUN Yu(School of Civil Engineering&Architecture,Xinjiang Civil Engineering Technology Research Center,Xinjiang University,Urumqi Xinjiang 830047,China;Xinjiang Civil Aviation Professional Engineering Quality Supervision Station,Urumqi Xinjiang 830016,China)
出处
《新疆大学学报（自然科学版）（中英文）》
2021年第2期229-234,共6页
Journal of Xinjiang University(Natural Science Edition in Chinese and English)
基金
国家自然科学基金项目(51768070)。
关键词
路基工程
低液限粉土
水盐迁移
供给源
subgrade engineering
low liquid limit silt
water-salt migration
supply sources
