季冻区沥青路面车辙预估模型方法研究

发布时间：2018-04-13 16:39

本文选题：沥青混合料 + 永久变形　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：沥青混合料的永久变形（车辙）是柔性路面体系中几种最重要的破坏形式之一。永久变形会直接地影响路面舒适性和使用性能，甚至会危害汽车的行驶安全性，并且随着车辙深度的不断积累也会造成路面结构的严重损害。因此在现阶段实用而合理地预估车辙对我国路面的结构设计和养护决策都是很有帮助的。本文将参照国内外的永久变形预估方法，选取合适的粘弹流变模型，建立沥青混合料的永久变形预测模型，针对季冻区的气温环境特点，建立季冻区沥青路面的车辙预测模型，具体的工作包括以下几点：进行了动态粘弹参数的分析。从基本的流变力学和粘弹模型入手，介绍粘弹流变学中简单的概念、基本元件以及组合模型，并评价各模型的优缺点。针对沥青混合料的变形发展特点，选择拟合度高而外延性强的Burgers模型，进行拟合后得到相应的粘弹参数。建立了沥青混合料的永久变形预估模型。在确立了合理的预估模型参数的基础上，进行了恒定荷载单次和重复作用下的永久变形分析，对模型中的温度、轮压、车速这三个外部荷载环境参数进行分析，提出了各参数不同值时的解决方法，提高了模型的适用范围，并确立了永久变形发展临界温度的标准和计算方法。确定了车辙叠加和车辙等效温度的计算方法。基于前面得到的沥青混合料的永久变形预估模型和永久变形发展的临界温度，参考AASHTO2002对车辙的叠加方法，提出了适合新模型分温度区间特点的车辙累积计算方法，在此基础上，得出了全新的等效温度的计算方法。进行季冻区的车辙预测模型方法研究。根据季冻区气温、太阳辐射等参数合理预估路面温度场，，针对季冻区年温差大、低温时间长的特点，基于前文所确立的车辙预估模型、有效温度区间以及等效温度的计算方法，给出季冻区的车辙预测模型和车辙等效温度值，并与现有模型进行对比，分析其不合理之处。
[Abstract]:Permanent deformation (rut) of asphalt mixture is one of the most important failure forms in flexible pavement system.Permanent deformation will directly affect the road comfort and performance, and even endanger the driving safety of the vehicle, and along with the accumulation of rutting depth will cause serious damage to the pavement structure.Therefore, practical and reasonable prediction of rutting is helpful for structural design and maintenance decision of pavement in China.In this paper, the prediction model of asphalt mixture permanent deformation is established by selecting suitable viscoelastic rheological model according to the prediction methods of permanent deformation at home and abroad, and the rutting prediction model of asphalt pavement in seasonal frozen area is established according to the characteristics of air temperature environment in seasonal frozen area.Specific work includes the following:The dynamic viscoelastic parameters are analyzed.Starting with the basic rheological mechanics and viscoelastic model, this paper introduces the simple concepts, basic components and combined models of viscoelastic rheology, and evaluates the advantages and disadvantages of each model.According to the characteristics of asphalt mixture deformation and development, the Burgers model with high fit degree and strong external ductility is selected, and the corresponding viscoelastic parameters are obtained after fitting.The prediction model of permanent deformation of asphalt mixture is established.On the basis of reasonable prediction model parameters, the permanent deformation analysis under single and repeated action of constant load is carried out, and the environmental parameters of temperature, wheel pressure and speed of external load in the model are analyzed.The solutions for different values of each parameter are put forward, the applicable range of the model is improved, and the standard and calculation method of the critical temperature for the development of permanent deformation are established.The calculation method of rut superposition and rut equivalent temperature is determined.Based on the prediction model of the permanent deformation of asphalt mixture and the critical temperature of the development of the permanent deformation, and referring to the superposition method of AASHTO2002 to the rut, a rut accumulation calculation method suitable for the characteristic of the temperature interval of the new model is put forward.A new method of calculating equivalent temperature is obtained.The method of rutting prediction model in seasonal frozen area is studied.According to the temperature, solar radiation and other parameters of seasonal freezing area, the pavement temperature field is reasonably estimated. In view of the characteristics of large annual temperature difference and long low temperature time in seasonal frozen area, the rut prediction model, effective temperature range and equivalent temperature calculation method are established.The prediction model of rut and the equivalent temperature value of rut in seasonal frozen area are given, and compared with the existing models, the irrationality of the model is analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217;U418.68

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