双向冻融条件下粉质黏土的水热特征研究

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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）06-0081-07DOI：10.19860/j.cnki.issn1005-8249.2025.06.015

Abstract：Toinvestigatethefreeze-thawbehaviorof subgradesoilattheculverttopinseasonalfrozenregions，laboratory freze-thaw experiments wereconducted.Theevolution characteristics of internal temperature，moisturemigration，and frezingdepth withinthesoil weresystematicallanalyzed.Duringbidirectionalfreezeandthaw，thealternationoffreezeand thawlead tolarge temperatureflutuationsandunevendistribution，whichisnonlinear，especiallformingadistinctcoldbelt inthe middleandlowerparts.After thebidirectionalfreeze-thawcycles，the moisturecontent distributionof hesamples shows apaterof "inrease-decrease-increase"fromtoptobotom，andthistrendbecomes morepronouncedwiththeincreaseof the initialmoisturecontent.Underthesamecold-endtemperatureconditions，thebidirectionalfrezingwithatemperaturedierence is moreffientthantheunidirectionalfrezing.Thefrezingdepthintheupperpartisabout1.7timesthatoftheunidirectional frezing，andthisatioisnegativelycorelatedwiththeinitialmoisturecontentTheresearchresultsprovideimporantguidance for theprevention and controloffreeze-thaw of the fillsoilon the topof culverts in seasonal frozen soil regions.

Keywords：siltclay；unidirectional/bidirectional freeze-thaw；temperature evolution；water migration；freeze depth

0 引言

反复冻融循环作用会产生强大的破坏力，对土体的物理性质、结构以及周边环境产生显著影响。（剩余8253字）