考虑温度场的沥青路面车辙变化特征分析研究

发布时间：2018-01-04 21:18

  本文关键词：考虑温度场的沥青路面车辙变化特征分析研究　出处：《长沙理工大学》2014年硕士论文　论文类型：学位论文

  更多相关文章： 沥青路面 数值模拟 温度场 车辙 动稳定度

【摘要】：目前,我国道路特别是高速公路,广泛采用沥青路面,但是随着通车里程飞速增长,汽车工业技术提升,交通量、车辆荷载不断增加,持续高温时间增长,很多新建道路在短时间内就出现了严重的车辙破坏。本文对沥青路面温度场分析的基础上,从温度、荷载、沥青层层厚的角度对车辙的变化特征进行了研究,针对规范中高温性能指标的不足之处,提出不同层位的高温性能动稳定度指标建议值。基于路面温度场的理论分析,建立了路面结构温度场的计算模型,对新郑高速公路高温季节代表日和月气象条件下的路面结构温度场进行了模拟计算和结果分析,并分析了热物理参数对温度场的影响规律。根据新郑高速交通状况的调查,确定所研究的轴载范围,分析了不同轴载下路面结构内部的力学响应,分析了车辙随加载次数的变化规律,然后在数值模拟的基础上提出一个基于车辙等效的轴载换算公式,并对新郑高速的车辙进行预估。通过对车速的调查汇总确定了车速研究范围,分析了车速对车辙的影响,结果表明：随着行车速度的增大,路面车辙量逐渐减小,且车辙量与行车速度并非呈线性关系。在荷载作用下,车辆行驶的车速越大,荷载作用路面的时间越短,产生的车辙破坏就越小,反之产生的车辙破坏就越大。基于温度的角度分析了车辙的变化规律,得到沥青路面高温代表日以及高温月份的车辙分布规律,并且分析了路表的变形规律。从路面结构沥青层厚度的角度出发,利用回归拟合出车辙随沥青层厚度的变化规律,结果表明：当沥青层厚度增加时,路面产生的车辙深度不断增大,但车辙发展速度不断减小；路面车辙并非随厚度的增加而成直线上升,其增幅随厚度的增大逐渐变缓。在温度与荷载共同作用下,根据时-温等效原理进行温度与荷载等效性分析,得出在温度一定的情况下,增加荷载与温度升高可以等效。依据工程所在地的气候、道路交通量、结构类型与层位并结合工程实践经验研究高温性能需求的计算方法,并结合路面结构,提出基于路面不同层位的动稳定度指标建议值,为以后路面配合比设计提供参考。
[Abstract]:At present, China's road especially highway, asphalt pavement is widely used, but with the mileage of rapid growth, improve industrial technology of the automobile traffic volume, vehicle load increasing, the time duration of high-temperature growth, a lot of new roads in a short period of time appeared severely damaged. Based on the rutting of asphalt pavement temperature field analysis. From the temperature, load, variation of rutting depth of asphalt layer thickness angle was studied, aiming at shortcomings of high temperature performance index specification, put forward different layers of high temperature dynamic stability index value is suggested. The analysis of temperature field based on the theory, established the calculation model of temperature field of pavement structure, pavement the temperature structure of Xinzheng Expressway in high temperature season on behalf of daily and monthly meteorological conditions are simulated result of calculation and analysis, and analysis of the thermal physical parameters on the temperature field. Investigated. According to the survey of Xinzheng high speed traffic conditions, determine the research range of the axle load, analyze the mechanical response of pavement structure under different axial load internal, analyzed the rut with load frequency, and then put forward a rutting equivalent shaft based on load conversion formula based on the numerical simulation, and the Xinzheng high-speed track prediction. The speed range of speed through the investigation and research summary, analyzed the influence of vehicle speed on the rutting results show that: with the increase of train speed, rut capacity decreased gradually, and the rutting and vehicle speed is not linear. Under load, the vehicle speed is greater the road load, the shorter the time, the rutting damage is smaller, and the rutting damage is greater. The temperature based on the angle of analysis of rutting of asphalt pavement, get high temperature Rut distribution and high temperature on behalf of the month, and analyzed the deformation law of road surface. Starting from the asphalt pavement structure layer thickness angle, using the regression of track changes with the thickness of the asphalt layer, the results show that when the asphalt layer thickness increases, rut depth production is increasing, but the development of rut the speed decreases; with the increase of the thickness of pavement rutting is not a linear rise, increase the increase with the thickness gradually slow. In the interaction between temperature and load, according to the time temperature equivalent principle of temperature and load equivalent analysis, obtained at certain temperature, increase the load and temperature rise can be equivalent. According to local climate, traffic volume, structure types and layers and the calculation method in combination with the engineering practice experience of high temperature performance requirements, combined with the pavement structure, based on the road The proposed value of the dynamic stability index of different horizons of the surface provides reference for the design of the mixture ratio of the pavement in the future.

【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：1380130