膨胀土的分类及判别标准研究

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中图分类号：TU443 文献标志码：A 文章编号：2095-2945（2025）30-0138-04

Abstract：Expansivesoils（fisuredclays）areprone tocause engineering diseasessuchassubgrade deformationandslope instabilityduetotheircharacteristicsofdryingshrinkageandwetexpansion.ThecurrentGB5O112-2013TechnicalCodefor ConstructioninExpansiveSoilRegionsinChinamainlyfocusesonbuildingfoundationsanddoesnotfullycoverthespecial requirementsofrailwayengineering.Basedonrailwayengineering practices，thispaperproposesaclasificationsystemfor expansive soils with the residual internal friction angle （φr） ，free swelling ratio （Fs） ，shear strength attenuation coefficient （ α=（φf -φr）/φr） ，and unconfined compressive strength （qu） as the core indicators.In combination with the field geological characteristics （suchasfissuredevelopmentdisintegrationetc.），atwostagedisciminationprocessofpreliinaryjudgment（qualitiveand detailedjudgment（quantitative）isestablishedThrouhthedataanalysisof1typicalrailayconstructionsites，itisverfidthat thisclasificationmethodcansignificantlyimprovetheevaluationacuracyofsubgradeslopestabilityandreducetheproject rework rate by more than 30%

Keywords：expansivesoil;criterion;residualinteralfrictionangle;freeexpansionrate;unconfinedcompresivestrength

膨胀土作为一种具有显著干缩湿胀特性的特殊土类，其工程危害在铁路建设中尤为突出。（剩余4239字）