新型盐渍土基泡沫轻质土隔断层阻盐机制及效果研究  

Salt-inhibiting mechanism and effect of new saline soil-based foamed lightweight soil separation fault

作　　者：张荣 赵斌 郑小川 陈令 卢正[1,5] 赵阳[1,6] ZHANG Rong;ZHAO Bin;ZHENG Xiao-chuan;CHEN Ling;LU Zheng;ZHAO Yang(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,ChineseAcademy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;PowerChina Chongqing Engineering Co.,Ltd.,Chongqing 400060,China;Ruibo New-Energy Group Co.,Ltd.,Taizhou,Zhejiang 317608,China;Hubei Key Laboratory of Environmental Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;Xinjiang Transportation Planning Survey and Design Institute Co.,Ltd.,Urumqi,Xinjiang 830006,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]中国科学院大学,北京100049 [3]中国电建集团重庆工程有限公司,重庆400060 [4]锐博新能源集团有限公司,浙江台州317608 [5]中国科学院武汉岩土力学研究所环境岩土工程湖北省重点实验室,湖北武汉430071 [6]新疆交通规划勘察设计研究院有限公司,新疆乌鲁木齐830006

出　　处：《岩土力学》2025年第2期515-526,538,共13页Rock and Soil Mechanics

基　　金：四川省交通运输科技项目(No.2021-ZL-05);2022年度交通运输行业科技项目(No.2022-ZD-017);湖北省交通运输厅科技项目(No.2020-186-1-9);湖北省创新群体项目(No.2023AFA019);新疆交通设计院科研基金(No.KY2022042504)。

摘　　要：盐渍土广泛分布于我国西部地区,其盐胀特性对道路工程产生严重危害,研究盐渍土路基水盐迁移规律并切断其路径对盐渍土地区道路安全防治起到关键作用。基于开挖废土利用构想,提出一种新型盐渍土基泡沫轻质土作为盐渍土地区路基隔断层。采用自研设备开展相关试验,测试其内部温度变化、竖向位移及冻融后的水盐分布,分析新型泡沫轻质土隔断层的隔盐消胀效果,并从微观结构角度探究阻盐机制。结果表明:在温度梯度下,盐渍土试样内部水分与盐分向上迁移,多在中上部聚集。新型泡沫轻质土隔断层能有效阻隔水盐上迁并抑制盐胀,土体含盐量越高,抑胀效果越好。盐分在泡沫轻质土孔洞内析出结晶成盐壳,泡沫轻质土的多孔结构不仅能有效储存盐分,而且能阻隔盐分迁移,使盐分结晶在其内部进行,从而减少盐胀对土体的破坏。Saline soil,common in the western China,poses a significant threat to road engineering due to its salt swelling characteristics.Therefore,studying the water-salt migration patterns within saline soil subgrades and developing methods to interrupt this migration are crucial for road safety prevention and control.Based on the utilization of excavated waste soil,a new type of foamed lightweight soil based on saline soil is proposed as a subgrade separation fault in saline soil areas.Using self-developed equipment,we tested internal temperature changes,vertical displacements,and water and salt distribution after freeze-thaw cycles.The objective was to evaluate its salt insulation and swelling suppression capabilities and to explore the microstructure-based mechanisms underlying salt inhibition.Results indicate that under a temperature gradient,water and salt in the saline soil sample migrate upward,accumulating mainly in the middle and upper sections.Notably,the novel foamed lightweight soil separation fault effectively blocks water and salt migration,significantly suppressing salt swelling.Interestingly,a higher soil salt content results in a more pronounced anti-swelling effect.The porous structure of the foamed lightweight soil can not only store salt effectively,but also block salt migration,allowing salt crystallization within the soil,thereby reducing salt swelling damage.

关 键 词：盐渍土 水盐迁移 隔断层 冻融循环 泡沫轻质土 

分 类 号：TU448[建筑科学—岩土工程]