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时间:2020-03-25
《干湿效应作用下改良红粘土路基长期性能试验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第42卷,第5期公路工程V01.42,No.52017年10月HighwayEngineeringOct.。2017干湿效应作用下改良红粘土路基长期性能试验研究郭彪,李亚军,叶成,陈贺(云南省交通规划设计研究院陆地交通气象灾害防治技术国家工程实验室,云南昆明650041)【摘要】为了研究改良红粘土路基的长期性能,对素红粘土、机制砂改良红粘土(掺砂比40%)、生石灰改良红粘土(掺灰比4%)3种情况分别进行了0、1、3、5次干湿循环试验研究,得到了试样CBR值与干湿循环次数的关系。试验结果表明,素红粘土的长期性能对环境中的湿度变化十分敏感,随着干湿循环次数增加,素红粘土试样CB
2、R值呈现逐渐衰减趋势,5个干湿循环周期后,CBR衰减幅度达到40%;机制砂对红粘土的长期性能略有改善,但机制砂改良红粘土对环境中的湿度变化仍然比较敏感,5个干湿循环周期后,CBR值衰减幅度约为20%;生石灰对红粘土的长期性能稳定改善效果显著,生石灰改良红枯土对环境中的湿度变化不敏感,随着干湿循环次数增加,生石灰改良红粘土试样CBR值呈现不降反升的趋势,5个干湿循环周期后CBR上升幅度高达78%。【关键词】红粘土;机制砂;生石灰;CBR值;干湿循环[中图分类号]U416.1+6【文献标识码]A【文章编号]1674-0610(2017)05-0273-05Experimenta
3、lStudyonLongTermPerformanceofImprovedRedClayEmbankmentundertheActionofDryandWetEffectGUOBiao,LIYajun,YEXian,CHENHe(NationalEngineeringLaboratoryforLandTransportMeteorologicalDisasterControlTechnology,Broad-visionEngineeringConsultants,Kunming,Yunnan650041,China)[Abstract]Inordertostudythel
4、ongtermperformanceoftheimprovedredclayembankment,theCBRvaluesoftheredclay,theredclayimprovedby40%manufacturedsandandtheredclayimprovedby4%quicklimeweretestedunder0,1,3,5timesofwetanddrycycles,andtherelationshipbetweentheCBRvaluesandthenumberofwetanddrycycleswasobtained.Thetestresultshowtha
5、tthelong-termperformanceofredclayisverysensitivetohumiditychangesintheenvironment.theCBRvalueofredclaysamplesdecreasegraduallywhilethenumberofcyclesincreased,after5cyclesofwetanddrycycles,theCBRattenuationratereaches40%;Thelong-termperformanceofimprovedredclaybymanu-faeturedsandisstillsens
6、itivetohumiditychangesintheenvironment,after5cyclesofwetanddrycy—cles。theCBRattenuationratereaches20%;However,theeffectofquicklimeonthelong-termstabilityofredclayissignificant,thelong-termperformanceofimprovedredclaybyquicklimeisnotsensitivetohumiditychangesintheenvironment,insteadofdecrea
7、sing,theCBRvalueincreasegraduallywhilethenumberofcyclesincreased,after5cyclesofwetanddrycycles,theCBRvalueis1.78timeslargerthanthevalueofsamplewithoutwetanddrycycle.[Keywords]redclay;manufacturedsand;quicklime;CBRtest;wetting-dryingcycles0前言红粘土广泛分布于我国云贵高原、四川东部
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