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ID:51467905
大小:2.09 MB
页数:6页
时间:2020-03-25
《青临高速试验路沥青路面结构应变分析和永久变形预估.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32卷第8期2015年8月公JournalofHighwayand科技ItesearchandV01.32No.8Aug.2015doi:10.3969/j.issKl,1002—0268.2015.08.00l青临高速试验路沥青路面结构应变分析和永久变形预估韦金城,余四新(高速公路养护技术交通行业重点实验室,山东济南250031)摘要:为了分析和预估青临高速试验路沥青路面结构疲劳寿命和永久变形,为长期性能观测验证提供基础对比数据,按照标准试验方法对试验路土基、粒料、无机结合料以及沥青混合料的力
2、学参数进行测试分析;结合同类道路交通荷载分析,得出试验路交通组成、轴载谱及3类典型轴的最大特征值;按照弹性层状理论计算了常温和高温条件下沥青层底最大弯拉应变;用MEPDG永久变形预估模型分析了不同路面结构沥青层永久变形发展规律,预测车辙养护修复的时间,结果表明,所设计的沥青路面结构基本满足长寿命沥青路面沥青层底弯拉应变小于疲劳极限应变的要求,MEPDG预测车辙主要发生在表面层,中下面层车辙较小,表面层采用高模量沥青混合料可显著提高路面抗车辙能力,关键词:道路工程;路面性能预估:MEPDG;极限应变
3、;永久变形中图分类号:U416.2文献标识码:A文章编号:1002—0268(2015)08—0001—05AnalysisofStrainandPredictionofPermanentDeformationforAsphaltPavementofQingzhou—·LinshuExpresswayTestRoadWEIJin—eheng,YUSi—xin(KeyLaboratoO'ofExpresswayMaintenanceTechnology,MinislryofTransport,Jin
4、anShaMong250031,China)Abstract:InordertoanalyzeandpredictthefatiguelifeandpermanentdeformationofasphaltpavementstructureofQingzhou——Linshuexpresswaytestroadantiprovidefundamentalcomparativedataforlong—-termperformanceobservation,themechanicalparameter
5、sofsoilsubgrade,granules,inorganicbinderandasphaltmixtureusedinthetestroadareanalyzedaccordingtothestandardtestmethod.Thetrafficcomposition,theaxleloadspectrumandthemaximumcharacteristicvaluesof3typicalaxletypesareohtainedbyanalyzingthetrafficloadonsi
6、milarroad.Themaximumflexural—tensilestainsatthebottomofasphahmixturelayersundernomlalandhightemperatureconditionsarecalculatedusingtheelasticmultilayel‘theory.TheMEPDGpermanentdeformationpredictionmodelisappliedtoanalyzethedevelopmentofpermanentdeform
7、ationintheasphaltlayersofdifferentpavementstructures,andtheirruttingmaintenancetimeispredicted.TheresultSHOWSthat(1)thedesignedasphaltpavementstructurebasicallymeetstherequirementoflong—lifeasphaltpavementthatthetlexural·tensilestrainatasphaltlayerbot
8、tomislessthanthefatiguelimitstrain,andtheruttingpredictedhyMEPDGoccurredmainlyinthesurfacelayer,whilerarelyoccurredinmiddlelayerandlowerlayer;(3)itwillsignificantlyimprovetheruttingresistancepropertywhenhighmodulusasphaltmixturesareappliedinth
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