隔水透气隔断层对寒旱区盐渍土水盐迁移及变形特性的影响  

Research on the influence of water and salt migration and deformation characteristics of saline soil in cold and arid regions by water and breathable separation layer

作　　者：周凤玺[1,2] 杨仕钊 张留俊[3] 马强 ZHOU Fengxi;YANG Shizhao;ZHANG Liujun;MA Qiang(College of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou 730050,China;CCCC First Highway Consultants Co.,Ltd.,Xi’an 710065,China;School of Civil Engineering,Qinghai University,Xining 810016,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050 [3]中交第一公路勘察设计研究院有限公司,陕西西安710065 [4]青海大学土木工程学院,青海西宁810016

出　　处：《冰川冻土》2024年第4期1225-1233,共9页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(12362032,11962016);甘肃省重点研发计划项目(23YFFA0063)资助。

摘　　要：针对寒旱区盐渍土水盐迁移引起的盐冻胀变形病害问题,本研究提出了一种新型的隔水透气膜隔断层处理方法,并开展了相应的理论分析和室内试验研究。基于多孔介质理论和连续介质力学理论,通过考虑温度变化下孔隙水盐相变等因素,建立了非饱和盐渍土的水-热-盐-力多场多相耦合模型。在水盐补给条件下,采用数值模拟和室内模型试验研究了非饱和硫酸盐渍土的水盐迁移和盐冻胀变形特性,并验证了模型的有效性。重点分析了设置隔水透气膜对非饱和硫酸盐渍土热质迁移及变形行为的影响。研究结果表明:隔水透气层对液态水和溶解盐的迁移具有明显的阻滞作用。同时,由于隔断层的透气特性,可有效地解决传统土工膜隔断层下气体聚集现象。研究成果可为盐渍土路基处理提供技术与理论基础。In recent years,under the“Belt and Road”initiative and the“transportation power”strategy actively promoted by China,the transportation infrastructure in the cold and arid regions of northwest China has been strengthened.As these constructions progress,it was inevitable to cross sections of saline soil,which created a series of challenges and problems for the construction and maintenance of the area.Problems caused by saline soils can not only be problematic during construction,but also have an impact on the long-term maintenance and operation of the facility.In the cold and arid regions of northwest China,the distribution of saline soils poses considerable challenges to infrastructure construction.In these areas,sulfate saline soil,as the most representative saline soil,exhibits a particularly obvious salt frost heave phenomenon when the temperature changes.The fluctuation of temperature,humidity and salt concentration in sulfated saline soil will cause salt heave and frost heave in the subgrade of sulfate saline soil,resulting in uneven uplift,structural relaxation and cracks on the pavement.These diseases not only affect the structural strength and stability of the roadbed,but also may cause hidden dangers to traffic safety and increase the risk of traffic accidents.In view of this,researchers and engineers have been exploring effective treatment technologies and methods to mitigate or eradicate the negative effects of saline soil.Among the many solutions,geopartition technology has been widely recognized and adopted for its economy and practicality.On this basis,this study proposes an innovative water-permeable membrane partition treatment technology,which aims to effectively control the movement of water and salt in saline soil by means of physical isolation and reduce the structural deformation and damage caused by salt frost heave.Based on the theory of porous medium and continuum media,and considering the effects of temperature change and water-salt recharge conditions on the water-salt phase trans

关 键 词：硫酸盐渍土 隔水透气隔断膜 水盐迁移 数值模拟 室内试验 

分 类 号：TU448[建筑科学—岩土工程]