基于热力学的沥青混合料粘弹-粘塑性损伤本构模型  

Viscoelastic-viscoplastic Damage Constitutive Model Based on Thermodynamics for Asphalt Mixtures

作　　者：朱浩然[1] 孙璐[1,2] 朱耀庭 

机构地区：[1]东南大学交通学院,江苏南京210096 [2]美国天主教大学土木工程系,华盛顿哥伦比亚特区20064 [3]江西省交通科学研究院,江西南昌330038

出　　处：《中国公路学报》2013年第3期57-64,共8页China Journal of Highway and Transport

基　　金：国家自然科学基金重点项目(U1134206);国家自然科学基金外国青年学者研究基金项目(51150110478;51250110075);美国国家科学基金项目(CMMI-0644552;CMMI-0408390);江苏省自然科学基金重点项目(SBK200910046);江苏省"六大人才高峰"项目(20091210);霍英东基金优秀青年教师资助项目(114024)

摘　　要：为了表征沥青混合料的力学行为,以不可逆热力学理论为基础,推导出沥青混合料粘弹-粘塑性损伤本构模型;将建立的本构模型用于分析沥青混合料三轴蠕变试验和等应变速率压缩试验。结果表明:该模型能够合理描述沥青混合料蠕变试验的三阶段,准确表征其三维变形特征,并能从机理上分析沥青混合料的变形行为;可以较准确地预估等应变速率压缩试验中的应力-应变发展规律及应力峰值和体积变形规律;所提出的粘弹-粘塑性损伤本构模型能够表征沥青混合料在多种压缩加载模式下的力学行为特征。In order to find out the mechanical behavior of asphalt mixtures, a viscoelastic- viscoplastic damage constitutive model for asphalt mixtures was derived based on the irreversible thermodynamics theory. The developed model was applied to analyze triaxial creep tests and constant strain rate compressive tests on asphalt mixtures. The results show that the model can reasonably describe the three stages of creep tests, and accurately reveal the three-dimensional deformation characteristics; the deformation behavior of asphalt mixtures can be analyzed mechanically using the constitutive model; this model can also effectively predict the stress-strain relation, the peak stress value and the development of volumetric deformation in constant strain rate compressive tests. It is indicated that the constitutive model can reveal the mechanical behavior of asphalt mixtures under various compressive loading conditions.

关 键 词：道路工程 沥青混合料 试验研究 粘弹-粘塑性 损伤 热力学 蠕变 

分 类 号：U416.217[交通运输工程—道路与铁道工程]