西北地质2026，Vol.59Issue(2)：83-90,8.DOI:10.12401/j.nwg.2025114
冻融作用下硫酸盐渍土土水特性及微观机理研究
Study on Soil-Water Characteristics and Micro-Mechanism of Sulfate Saline Soil under Freeze-Thaw Action
摘要
Abstract
In order to study the soil-water characteristics and micro-mechanism of sulfate saline soil under freeze-thaw-salt coupling,the soil-water characteristic curves of saline soil with different salt content were test-ed and fitted with Gardner model,van-Genuchten model,and Fredlund-Xing model,and the microstructure and pore distribution characteristics of sulfate saline soil under freeze-thaw-salt coupling were analyzed.The results indicate that the volumetric water content of sulfate-salted soil decreases as matrix suction increases,with the re-sulting curves exhibiting a single-peak inverse'S'shape.Notably,for a given volumetric water content,higher salt concentrations correspond to increased matrix suction.Freeze-thaw cycles promote the microstructural dis-integration of the soil,leading to an increase in large pore volume and overall porosity.Following these cycles,both the matrix suction and volumetric water content of the soil samples decreased,causing the soil-water char-acteristic curve to shift leftward with an increasing number of freeze-thaw cycles.To evaluate the test results of saline soil,the G model,V-G model,and F-X model were employed.The F-X model exhibited a low fitting cor-relation coefficient,while the V-G model demonstrated poor fitting in both high and low suction phases.In con-trast,the G model provided an overall good fitting performance.The microstructural changes in soil samples re-sulting from freeze-thaw actions are critical factors contributing to the reduction of the soil's water-holding ca-pacity.The progressive development of pores and fissures in the samples,influenced by freezing,thawing,and salinity,facilitates the migration of water equilibrium.关键词
冻融循环/盐渍土/滤纸法/微观结构/土水特性Key words
freeze-thaw cycle/saline soil/filter paper method/microstructure/soil-water characteristics分类
天文与地球科学引用本文复制引用
凌松耀,蹇永明,秦川,吴倩,张轰,曹胜杰,王位..冻融作用下硫酸盐渍土土水特性及微观机理研究[J].西北地质,2026,59(2):83-90,8.基金项目
中交第二公路工程局有限公司重点科技项目(2020X-1-20),陕西省自然科学基础研究计划(2021JM-180)联合资助. （2020X-1-20）
