超载作用对冷再生沥青路面结构的影响及有限元分析

发布时间：2018-03-02 21:32

本文选题：冷再生沥青路面　切入点：超载　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文针对车辆超载现象的日益严重性和冷再生沥青路面使用的日益广泛性，参考有关规范和相关技术文献，通过有限元法模拟了冷再生沥青路面中的一种典型路面结构，根据各结构层的弹性模量、密度、泊松比等物理参数，使用移动荷载进行加载，对超载作用下各结构层尤其是冷再生层的动力特性进行对比分析并总结规律。本文在绪论中介绍了冷再生沥青路面的国内外研究现状，并列出了本文的主要研究内容和创新点；第二章介绍了相关的力学理论，为后面的分析打好理论基础；第三章根据一种典型的冷再生路面结构和超载车辆接地面积及压强的计算建立有限元模型；第四章具体分析了标准轴载时移动荷载作用下冷再生沥青路面各结构层的各向动位移、动应力、动应变、水平动剪应力和横向动剪应力的动力响应；第五章的第一节，对不同超载率作用下冷再生沥青路面各结构层的动力响应进行了对比分析，得出超载对路面结构损伤的程度比在正常荷载作用下大得多，因此在部分特殊地区（比如采矿区）的冷再生沥青路面设计中，有必要考虑车辆的超载因素，否则，容易使路面结构提前遭到破坏，过早进入维修期。第五章的第二节，分别对不同超载率、不同冷再生层层厚作用下冷再生沥青路面各结构层的动力响应进行了对比分析，建议在此种结构下冷再生层层厚取20~25cm为宜，此时能够在确保路面性能的基础上节约材料，减少工程造价。第五章的第三节，选取冷再生层层厚为15cm，对不同超载率、不同行车速度作用时冷再生沥青路面各结构层的动力响应进行了对比分析,根据分析结果得出，从车速提高使车辆的移动荷载对路面任一点的作用时间变短这个角度来说，车速的提高是有利于路面的，，从实际道路表面不平整、路面有积水或积雪、车辆行驶过程中制动、转弯等偶然因素作用的情况下来说，车速增加使路面冲击动力增大，对路面结构极为不利，建议对车辆限速。最终结果表明，冷再生沥青路面具有良好的强度可以保证路面具有较高的承载力，满足一般的路用性能要求。但是超载作用对冷再生沥青路面的影响是巨大的，在交通管理中，应该对超载车辆进行严格的控制，以保证路面具有较好的行驶质量和较长的使用寿命。本文为实践中冷再生技术的设计、施工提供了科学依据。
[Abstract]:In view of the increasing seriousness of vehicle overload phenomenon and the increasing popularity of cold recycled asphalt pavement, referring to relevant specifications and related technical documents, this paper simulates a typical pavement structure in cold recycled asphalt pavement by finite element method. According to the physical parameters such as elastic modulus, density and Poisson's ratio of each structure layer, the dynamic characteristics of each structure layer, especially the cold regenerated layer, under the action of overload are analyzed and summarized by moving load. In the introduction, this paper introduces the domestic and international research status of cold recycled asphalt pavement, and lists the main research contents and innovation points of this paper. The second chapter introduces the relevant mechanics theory, which lays a good theoretical foundation for the later analysis. In the third chapter, a finite element model is established according to a typical cold-regenerated pavement structure and the calculation of ground area and pressure of overloaded vehicle. In chapter 4th, the dynamic responses of dynamic displacement, dynamic stress, dynamic strain, horizontal dynamic shear stress and transverse dynamic shear stress of each structure layer of cold recycled asphalt pavement under moving load under standard axial loading are analyzed. The dynamic response of each structure layer of cold recycled asphalt pavement under the action of different overload ratio is compared and analyzed. It is concluded that the degree of damage caused by overload on pavement structure is much greater than that under normal load. Therefore, in the design of cold recycled asphalt pavement in some special areas (such as mining areas), it is necessary to consider the overload factor of vehicles, otherwise, it is easy to destroy the pavement structure ahead of time and enter the second section of Chapter 5th. The dynamic responses of each structure layer of cold recycled asphalt pavement under the action of different overload ratio and different cold regenerative layer thickness are compared and analyzed respectively. It is suggested that the thickness of cold regenerated layers under this kind of structure should be 20 ~ 25cm. In the third section of Chapter 5th, the thickness of the cold regenerated layer is 15 cm, and the overloading rate is different. The dynamic response of each structure layer of cold regenerated asphalt pavement under different driving speeds is compared and analyzed. According to the analysis results, it is concluded that, from the point of view of increasing the speed of the vehicle, the action time of moving load on any point of the road becomes shorter, The increase of vehicle speed is beneficial to the road surface. In the case of uneven road surface, stagnant or snowy road surface, braking and turning in the course of the vehicle, it is said that the increase of speed increases the impact power of the road surface. It is very unfavorable to the pavement structure, so it is suggested to limit the speed of the vehicle. The final results show that the cold recycled asphalt pavement has a good strength to ensure that the pavement has a higher bearing capacity to meet the general road performance requirements, but the impact of overload on the cold recycled asphalt pavement is great. In traffic management, overloaded vehicles should be strictly controlled in order to ensure better driving quality and long service life. This paper provides a scientific basis for the design and construction of intermediate cold regeneration technology.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217

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