动态回弹模量滞回曲线形态参数研究  

Study on Morphological Parameters of Hysteretic Curve of Dynamic Resilient Modulus

作　　者：刘靖宇[1] 刘朝晖[1] 王旭东[2] 黄优[1] LIU Jing-yu LIU Zhao-hui WANG Xu-dong HUANG You(School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha Hunan 410004, China Research Institute of Highway, Ministry of Transport, Beijing 100000, China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410004 [2]交通运输部公路科学研究院,北京100000

出　　处：《公路交通科技》2017年第10期6-12,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51678078);湖南省研究生科研创新项目(CX2015B351)

摘　　要：动态回弹模量的滞回曲线是动态加载作用下混合料的荷载和变形曲线,可反映沥青混合料内部应力应变状态随荷载和温度等的演变规律。基于黏弹理论可确定滞回曲线的3种形态参数:长轴斜率k、椭圆离心率e、滞回曲线面积S,分别表征沥青混合料的动态回弹模量、黏滞性及耗散能。并由此进行不同温度、荷载的动态回弹模量试验,结果发现:随温度升高SBS与70#沥青混合料形态参数存在较大差异,且其变化曲线均在15~20℃出现明显拐点;随荷载级位变大k,S呈一定的变化规律但e值基本不变。表明:(1)相对级配而言,沥青品质对混合料性能影响更大,而黏滞性与荷载大小无关;(2)在15~20℃间沥青混合料的力学性能差异较大,对温度的敏感性较高;(3)不同的滞回曲线形态参数取值体现了沥青混合料间的性能差异,可以采用3种形态参数对沥青混合料的黏滞性、耐疲劳性等基本力学性能进行评价。最后,基于试验曲线的变化规律,建立了回弹模量的应力依赖性模型,可反映不同应力水平条件下沥青混合料的响应行为,且预测结果较接近真实状态;基于Miner线性损伤准则,推导了变荷载累积耗散能预估方程,并建立了基于能量耗散理论的疲劳方程,可以通过动态模量试验得到的形态参数S对混合料疲劳性能进行预测。The hysteresis curve of dynamic resilient modulus（ DRM） is the load and deformation curve of asphalt mixture under dynamic loading,it can reflect the evolution rule of internal stress-train state with load and temperature. Based on viscoelastic theory,3 morphological parameters could be determined： slope k of major axis,eccentricity e of ellipse,and area S of HC,which characterizes DRM,viscosity and energy dissipation capacity of asphalt mixture respectively. Thus the DRM test under various temperatures and loads are carried out. The result shows that there is a significant difference in the morphological parameters of SBS and asphalt mixture No. 70 with the increase of temperature,and a inflection point exists at 15 ~ 20 ℃ in both hysteresis curves,the values of k and S change regularly but e keeps unchanged as load level increases.It indicates that（ 1） asphalt quality has more influence on the property than grade,and the viscosity is unrelated to load size;（ 2） between 15 ~ 20 ℃,the mechanical properties of asphalt mixture vary greatly,and their sensitivity to temperature are higher;（ 3） different values of morphological parameters of HC reflect the performance difference of asphalt mixture,and 3 morphological parameters could be used to evaluate the basic mechanical performance of asphalt mixture include viscosity,fatigue durability,etc. Finally,based onthe changing rule of test curves,the stress dependence model of resilience modulus which reflects the response behaviors of asphalt mixture under various stress level conditions is established,and the prediction results are close to the real state. The variable load cumulative dissipation energy prediction equation is derived based on the Miner linear damage criterion,and the fatigue equation based on the theory of energy dissipation is established. The morphological parameters S obtained by the dynamic modulus test can be used to predict the fatigue performance of asphalt mixture.

关 键 词：道路工程 形态参数 动态模量试验 滞回曲线 长轴斜率 离心率 耗散能 

分 类 号：U416.217[交通运输工程—道路与铁道工程]