混合式基层沥青路面车辙仿真分析
发布时间：2018-10-05 13:49
【摘要】：车辙是沥青路面的常见病害,实际路用性能显示,即使完全按照现行沥青路面设计规范要求进行设计,高温地区车辙病害仍然十分严重。复杂的自然环境直接导致路面结构的损坏和病害的大幅增加,降低路面的使用性能和服务寿命,造成了巨大的经济损失和社会影响。本文研究了广西地区高温多雨气候环境下的高速公路沥青路面车辙病害,结合当地南友、百罗、平钟三条高速公路的现场调研分析总结。将以路面芯样为对象研究的混合料结构类型的评价方法用于配合比设计阶段,与贝雷法、CAVF法等的矿料级配计算方法结合,严格控制级配设计。对用马歇尔试件来进行评定时,直接采用马歇尔试模来代替容量筒,这样有利于比较且可减小测量时带来的误差。运用有限元法对四种不同组合的路面结构进行了车辙分析,针对混合式基层与半刚性基层沥青路面的车辙对比可知,通过合理的结构设计,前者车辙深度要更小抗车辙性能更优越,如结构A路面相对车辙深度为较D结构小1.57mmm。经过论证得出以水稳为底基层,级配碎石为过渡层,及大粒径沥青碎石混合料作下面层的混合式基层沥青路面结构,不仅有利于减少路面裂缝的产生,改善沥青路面的内部排水,提高沥青路面稳定性和耐久性,而且不会因其剪切破坏而产生更严重的车辙。沥青路面中面层是车辙变形的主要层面。模拟计算结果显示,B、C两种结构结构中间层面所占比例占到了71.6%和75.2%,进一步确定了车辙变形发生在中面层这机理,模拟结果与实践经验理论相符。同时对比以往主要采用加速加载试验和足尺试验来研究车辙问题,这些都需要耗费大量的时间和金钱,而用计算机模拟技术可以减缓这些压力,可为我国高速公路沥青路面建设提供新的研究方向。
[Abstract]:Rutting is a common disease of asphalt pavement. The actual pavement performance shows that rutting is still very serious in high temperature area even if it is designed in accordance with the requirements of current asphalt pavement design code. The complex natural environment directly leads to the damage of pavement structure and the substantial increase of disease, reduces the pavement performance and service life, and causes huge economic loss and social impact. In this paper, the rutting disease of asphalt pavement of expressway in high temperature and rainy climate in Guangxi is studied, and the field investigation and analysis of three expressways in Nanyou, Bailo and Pingzhong are analyzed and summarized. The evaluation method of mixture structure type based on the core sample of road surface is used in the design stage of mix proportion, which is combined with the calculation method of ore aggregate gradation by Bayley method and CAVF method, and the gradation design is strictly controlled. When Marshall specimen is used for evaluation, Marshall test model is directly used to replace the capacity cylinder, which is advantageous to comparison and can reduce the error caused by measurement. The rutting analysis of four kinds of pavement structures with different combinations is carried out by using finite element method. According to the rutting comparison between the mixed base and semi-rigid base asphalt pavement, the reasonable structural design is obtained. The rutting depth of the former is less than that of the D structure, and the rutting resistance of the former is better, for example, the relative rutting depth of the structure A pavement is 1.57 mm / m smaller than that of the D structure. After demonstration, it is concluded that the mixed base asphalt pavement structure with water stability as the base, graded crushed stone as the transition layer, and large particle size asphalt macadam mixture as the lower layer is not only conducive to reducing the occurrence of pavement cracks, Improve the internal drainage of asphalt pavement, improve the stability and durability of asphalt pavement, and will not cause more serious rutting due to its shear failure. The middle surface of asphalt pavement is the main layer of rut deformation. The simulation results show that 71.6% and 75.2% of the middle layers of the two structures account for 71.6% and 75.2% respectively. The mechanism of rutting deformation in the middle layer is further determined. The simulation results are in agreement with the practical experience theory. At the same time, more than ever, accelerated loading tests and full-scale tests are used to study rutting problems, all of which cost a lot of time and money, and the use of computer simulation technology can alleviate these pressures. It can provide a new research direction for highway asphalt pavement construction in China.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217;U418.68
本文编号：2253639
[Abstract]:Rutting is a common disease of asphalt pavement. The actual pavement performance shows that rutting is still very serious in high temperature area even if it is designed in accordance with the requirements of current asphalt pavement design code. The complex natural environment directly leads to the damage of pavement structure and the substantial increase of disease, reduces the pavement performance and service life, and causes huge economic loss and social impact. In this paper, the rutting disease of asphalt pavement of expressway in high temperature and rainy climate in Guangxi is studied, and the field investigation and analysis of three expressways in Nanyou, Bailo and Pingzhong are analyzed and summarized. The evaluation method of mixture structure type based on the core sample of road surface is used in the design stage of mix proportion, which is combined with the calculation method of ore aggregate gradation by Bayley method and CAVF method, and the gradation design is strictly controlled. When Marshall specimen is used for evaluation, Marshall test model is directly used to replace the capacity cylinder, which is advantageous to comparison and can reduce the error caused by measurement. The rutting analysis of four kinds of pavement structures with different combinations is carried out by using finite element method. According to the rutting comparison between the mixed base and semi-rigid base asphalt pavement, the reasonable structural design is obtained. The rutting depth of the former is less than that of the D structure, and the rutting resistance of the former is better, for example, the relative rutting depth of the structure A pavement is 1.57 mm / m smaller than that of the D structure. After demonstration, it is concluded that the mixed base asphalt pavement structure with water stability as the base, graded crushed stone as the transition layer, and large particle size asphalt macadam mixture as the lower layer is not only conducive to reducing the occurrence of pavement cracks, Improve the internal drainage of asphalt pavement, improve the stability and durability of asphalt pavement, and will not cause more serious rutting due to its shear failure. The middle surface of asphalt pavement is the main layer of rut deformation. The simulation results show that 71.6% and 75.2% of the middle layers of the two structures account for 71.6% and 75.2% respectively. The mechanism of rutting deformation in the middle layer is further determined. The simulation results are in agreement with the practical experience theory. At the same time, more than ever, accelerated loading tests and full-scale tests are used to study rutting problems, all of which cost a lot of time and money, and the use of computer simulation technology can alleviate these pressures. It can provide a new research direction for highway asphalt pavement construction in China.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217;U418.68
【参考文献】
相关硕士学位论文 前1条
1 王书延;混合式基层沥青路面材料与力学性能研究[D];重庆交通大学;2008年
，本文编号：2253639
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