基于结构层寿命递增的耐久性沥青路面设计新思想
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摘要
为了建立科学的耐久性沥青路面设计新思想,通过力学分析探究了沥青路面近表面的应力分布特征,论证了以路表荷载作用区边缘作为沥青路面破坏源的合理性。针对中国现行沥青路面疲劳设计方法的缺陷,开展了沥青混合料疲劳试验,在考虑加载速度影响的基础上,建立了以真实应力比表征的沥青混合料疲劳方程。结合中国沥青路面各结构层设计寿命相等所诱发的问题以及实际沥青路面结构的破坏特征,提出了各结构层自上而下设计寿命递增的沥青路面结构设计新思想和耐久性沥青路面结构设计新理念。结果表明:沥青面层近表面是其真正的破坏源;基于真实应力比的疲劳方程反映了材料的本质特征;耐久性沥青路面的各结构层应采用疲劳寿命递增的方法进行设计。
In order to establish a new scientific structure design of durable asphalt pavement,the stress distribution characteristics near the asphalt pavement surface were explored by mechanical analysis.It was proved that taking the boundary of the loading action area on the surface as the source of damage was reasonable.Aimed at the defects of current fatigue design method for asphalt pavement in China,fatigue tests on asphalt mixture were carried out and fatigue equation characterized by real stress ratio was established with the influence of loading speed considered. A new structure design of durable asphalt pavement was proposed,according to which the design life of each structural layer,from surface layer to subbase course,would be increased to solve the problems in equal design life of each layer in China with asphalt pavement structure damage considered.The results indicate that the area near the surface of asphalt layer is the real damage source;the fatigue equation characterized by real stress ratio can reflect the essential features of the material;the method of fatigue life increment should be adopted in structure design of eachlayer for the durable asphalt pavement.
In order to establish a new scientific structure design of durable asphalt pavement,the stress distribution characteristics near the asphalt pavement surface were explored by mechanical analysis.It was proved that taking the boundary of the loading action area on the surface as the source of damage was reasonable.Aimed at the defects of current fatigue design method for asphalt pavement in China,fatigue tests on asphalt mixture were carried out and fatigue equation characterized by real stress ratio was established with the influence of loading speed considered. A new structure design of durable asphalt pavement was proposed,according to which the design life of each structural layer,from surface layer to subbase course,would be increased to solve the problems in equal design life of each layer in China with asphalt pavement structure damage considered.The results indicate that the area near the surface of asphalt layer is the real damage source;the fatigue equation characterized by real stress ratio can reflect the essential features of the material;the method of fatigue life increment should be adopted in structure design of eachlayer for the durable asphalt pavement.
引文
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[14]JTG E20—2011,公路工程沥青及沥青混合料试验规程[S].JTG E20—2011,Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering[S].
[2]姚祖康.沥青路面结构设计[M].北京:人民交通出版社,2011.YAO Zu-kang.Asphalt Pavement Structure Design[M].Beijing:China Communications Press,2011.
[3]沈金安.国外沥青路面设计方法总汇[M].北京:人民交通出版社,2004.SHEN Jin-an.Collection of Foreign Asphalt Pavement Design Method[M].Beijing:China Communications Press,2004.
[4]SALEH M F.Fatigue Behaviour Modelling in the Mechanistic Empirical Pavement Design[C]//SCARPAS A,KRINGOS N,AL-QADI I,et al.7th RILEM International Conference on Cracking in Pavements.Dordrecht:Springer,2012:517-525.
[5]Asphalt Institute Staff.Thickness Design-asphalt Pavements for Highways and Streets[M].Lexington:Asphalt Institute,1991.
[6]NCHRP.Guide for Mechanistic-empirical Design of New and Rehabilitated Pavement Structures[M].Washington DC:National Cooperative Highway Research Program,2004.
[7]郑健龙.基于状态设计法的沥青路面弯沉设计标准[J].中国公路学报,2012,25(4):1-9.ZHENG Jian-long.Deflection Design Standards of Asphalt Pavement Based on State Design Method[J].China Journal of Highway and Transport,2012,25(4):1-9.
[8]JTG D50—2006,公路沥青路面设计规范[S].JTG D50—2006,Specifications for Design of Highway Asphalt Pavement[S].
[9]徐芝纶.弹性力学[M].4版.北京:高等教育出版社,2006.XU Zhi-lun.Elastic Mechanics[M].4th ed.Beijing:Higher Education Press,2006.
[10]许志鸿,李淑明,高英,等.沥青混合料疲劳性能研究[J].交通运输工程学报,2001,1(1):20-24.XU Zhi-hong,LI Shu-ming,GAO Ying,et al.Research on Fatigue Characteristic of Asphalt Mixture[J].Journal of Traffic and Transportation Engineering,2001,1(1):20-24.
[11]BOUDABBOUS M,MILLIEN A,PETIT C,et al.Energy Approach for the Fatigue of Thermoviscoelastic Materials:Application to Asphalt Materials in Pavement Surface Layers[J].International Journal of Fatigue,2013,47:308-318.
[12]ZHU H,SUN L.A Viscoelastic-viscoplastic Damage Constitutive Model for Asphalt Mixtures Based on Thermodynamics[J].International Journal of Plasticity,2013,40:81-100.
[13]BEHIRY A E A E.Fatigue and Rutting Lives in Flexible Pavement[J].Ain Shams Engineering Journal,2012,3(4):367-374.
[14]JTG E20—2011,公路工程沥青及沥青混合料试验规程[S].JTG E20—2011,Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering[S].