西南交通大学学报2025，Vol.60Issue(5)：1090-1097,1120,9.DOI:10.3969/j.issn.0258-2724.20230299
冻融循环下盐渍土热-质传递及盐冻胀机理
Heat-Mass Transfer and Salt-Frost Heave Mechanism of Saline Soil under Freeze-Thaw Cycle
摘要
Abstract
To study the heat-mass transfer patterns and structural damage mechanisms of sulfate saline soil under freeze-thaw cycles,a freeze-thaw cycle test was carried out under non-pressurized supply condition with saline soil from Hexi Corridor as the research object.The pore structure damage mechanism of sulfate saline soil before and after freeze-thaw cycles was analyzed using nuclear magnetic resonance(NMR)and scanning electron microscope(SEM).The study shows that temperature transfer in the sulfate saline soil under freeze-thaw cycles exhibits the"depth effect"and"time-lag effect",with a time lag of about five hours.The freezing depth initially develops downward before stabilizing,reaching a maximum depth of 8.54 cm.The solution supply amount increases as temperature decreases and decreases as temperature rises.Water and salt content increase in the frozen zone after a 240-hour freeze-thaw cycle while remaining basically unchanged in the unfrozen zone.The deformation of saline soil due to salt-frost heave follows a cyclic pattern of"heave and thaw",with a time lag in response to temperature changes.Repeated cycles of"freezing-condensation-crystallization-thawing-dissolving"cause significant increases in medium and large pores of saline soil,leading to interconnected cracks.The soil structure transitions from a laminar structure before freeze-thaw cycle to a flocculent structure afterwards.关键词
硫酸盐渍土/冻融循环试验/传热传质/盐冻胀变形/结构演变Key words
sulfate saline soil/freeze-thaw cycle test/heat-mass transfer/salt-frost heave-induced deformation/structural transition分类
建筑与水利引用本文复制引用
余云燕,罗崇亮,崔文豪,杜乾中,高远,张庭华..冻融循环下盐渍土热-质传递及盐冻胀机理[J].西南交通大学学报,2025,60(5):1090-1097,1120,9.基金项目
甘肃省科技计划项目(23JRRA854) （23JRRA854）
甘肃省教育厅高校教师创新基金项目(2024A-121) 天水师范大学引进高层次人才科研启动项目(KYQ2023-06)的资助. （2024A-121）
