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贾岚茹^1，3，宋宏芳^1，3，王天亮^1，2，3

 

 

（1.石家庄铁道大学 道路与铁道工程安全保障省部共建教育部重点实验室，石家庄 050043；

 

2.石家庄铁道大学 省部共建交通工程结构力学行为与系统安全国家重点实验室，石家庄 050043； 3.石家庄铁道大学 土木工程学院，石家庄 050043）

 

 

摘要：针对季冻区涵洞顶部路基土体的冻融情况，开展室内冻融试验，分析土体内部温度、水分迁移及冻结深度的演变特征。结果表明:双向冻融时，冻结融化交替，温度波动大，分布不均，呈非线性分布，特别在中下部形成一条明显的冷温带；经双向冻融循环后，试件的含水率分布从上到下呈现出“增大-减小-增大”的变化规律，且随着初始含水率的增加，这种变化趋势愈发明显。在相同冷源温度条件下，有温差的双向冻结效率显著高于单向冻结，其上部冻结深度约为单向冻结上部冻结深度的1.7倍，且该比值与初始含水率呈负相关关系。研究结果为季冻区涵洞洞顶填土冻融防控提供重要指导作用。

关键词：粉质黏土；单/双向冻融；温度演变；水分迁移；冻结深度

中图分类号：U24

文献标志码：A

文章编号：1005-8249（2025）06-0081-07

DOI：10.19860/j.cnki.issn1005-8249.2025-06-015

 

 

JIA Lanru^1,3,SONG Hongfang^1,3,WANG Tianliang^1,2,3

 

 

(1.Key Laboratory of Roads and Railway Engineering Safety Control,Ministry of Education,Shijiazhuang

 

Tiedao University,Shijiazhuang 050043,China；2.State Key Laboratory of Mechanical Behavior and System

 

Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China；

 

3.School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

 

Abstract：To investigate the freeze-thaw behavior of subgrade soil at the culvert top in seasonal frozen regions,laboratory freeze-thaw experiments were conducted.The evolution characteristics of internal temperature,moisture migration,and freezing depth within the soil were systematically analyzed.During bidirectional freeze and thaw,the alternation of freeze and thaw leads to large temperature fluctuations and uneven distribution,which is nonlinear,especially forming a distinct cold belt in the middle and lower parts.After the bidirectional freeze-thaw cycles,the moisture content distribution of the samples shows a pattern of "increase-decrease-increase" from top to bottom,and this trend becomes more pronounced with the increase of the initial moisture content.Under the same cold-end temperature conditions,the bidirectional freezing with a temperature difference is more efficient than the unidirectional freezing.The freezing depth in the upper part is about 1.7 times that of the unidirectional freezing,and this ratio is negatively correlated with the initial moisture content.The research results provide important guidance for the prevention and control of freeze-thaw of the fill soil on the top of culverts in seasonal frozen soil regions.

 

Key words：silt clay;unidirectional/bidirectional freeze-thaw;temperature evolution;water migration;freeze depth

 

基金项目：国家自然科学基金(51978426,52378453,52408485)。

作者简介：贾岚茹（1998—），女，硕士研究生，研究方向:道路与铁道工程。

收稿日期：2025-02-11