沥青混合料力学性质应力依赖性研究  

Stress-dependent mechanical behavior of asphalt mixtures

作　　者：赵延庆[1] 谭忆秋[2] 于新[3] 

机构地区：[1]大连理工大学交通运输学院,辽宁大连116024 [2]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150001 [3]河海大学土木与交通学院,江苏南京210098

出　　处：《华中科技大学学报（自然科学版）》2010年第10期124-127,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50778057);交通部西部交通科技建设项目(200831800099)

摘　　要：为客观地反映沥青路面的力学行为,需要对温度、频率及应力状态这3个因素的影响进行综合考虑.通过对沥青混合料不同条件下动态模量试验结果的分析,表明沥青混合料的力学性质具有应力依赖性,尤其在温度较高时更为明显.以Sigmoidal函数为基础,结合Hirsh模型、k-θ模型和Arrhenius函数建立了沥青混合料动态模量应力依赖性的模型.根据试验结果确定了其参数,并对其进行了有效性验证.该模型将温度、频率及应力状态对沥青混合料力学性能的影响归入统一的数学公式中,可以方便地用于路面结构分析.利用非线性三维有限元对典型沥青路面结构进行了分析,得到了路面结构内的应力状态对沥青层动态模量分布的影响规律.The effects of temperature, loading obtain realistic results of pavement responses. frequency, and stress state were considered in order to Dynamic modulus test results obtained at various condb tions were analyzed. It is found that asphalt mixtures exhibit stress-dependent behavior, especially at high temperatures. A stress-dependent model was developed for asphalt mixtures based on Sigmoidal function, incorporating Hirsh model, k-θ model and Arrhenius function. The coefficients of the model were determined by the test results and its validity was verified. This model incorporates the effects of temperature, loading frequency and stress state on asphalt mixture＇s mechanical properties into math- ematical eqhations and can be easily used in pavement analyses. Non-linear three dimensional finite element analyses based on the model were conducted for a typical asphalt pavement, and the influences of stress state on dynamic modulus distribution within the pavement were investigated.

关 键 词：路面结构 沥青混合料 动态模量 应力依赖性 非线性三维有限元 Sigmoidal函数 

分 类 号：U414.1[交通运输工程—道路与铁道工程]