王玉龙,常立君,李舒洁

• 1:青海大学土木工程学院

摘要(Abstract)：

为了探寻季节性冻土区盐渍化路基土水盐迁移及变形规律，利用极端环境荷载测试系统，在开放条件下进行室内冻融循环试验。研究结果表明：土体的温度随上覆荷载的增大呈现出先降低后升高的特点，离冷源越近，土体温度变化越明显；上覆荷载作用下，土体在顶部密度增大，对水分迁移有抑制作用，盐分则在该处出现聚集现象，在其他高度处，由于土颗粒的重排列程度不同，水分盐分变化亦不尽相同；上覆荷载是导致土体发生压缩变形的直接原因，在同一循环周期内压缩变形随上覆荷载的增加而增大，在同一荷载作用下，压缩变形随冻融周期的增加而增大；通过微观结构对土体变形机理分析表明，晶须生成量减少，盐胀压力减弱是引起膨胀变形减少的主要原因，土颗粒破碎及土粒间隙减小是土体发生压缩变形的因素。

关键词(KeyWords)： 冻融循环;上覆荷载;盐渍土;水盐迁移;变形机理

Abstract:

Keywords:

基金项目(Foundation): 岩土力学与堤坝工程教育部重点实验室开放基金(2019005)

作者(Author): 王玉龙,常立君,李舒洁

DOI: 10.13928/j.cnki.wrahe.2022.02.014

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