长大上坡路段沥青路面抗车辙技术研究

发布时间：2018-03-16 10:07

本文选题：长大上坡　切入点：纵坡　出处：《长安大学》2014年博士论文　论文类型：学位论文

【摘要】：交通荷载作用于长大上坡路段沥青路面的状况与平坡路段相比，其对沥青路面的作用时间变长，在重载、高温的综合作用下，长大上坡段沥青路面的车辙变形发展、形成速度更快。系统开展长大上坡路段沥青路面抗车辙技术研究，对有效控制和解决长大上坡路段沥青路面的车辙问题是非常必要的。本文通过实地调查分析了长大上坡路段沥青路面的车辙病害、路面结构内温度分布状况、重载货车运行速度变化状况，结果表明：（1）车辙、推移病害是长大上坡路段沥青路面的主要病害类型，在夏季高温、重载、低速车辆荷载综合作用下，可能在夏季温度最高的一周或两周内快速形成车辙，通常连续上坡一侧的车辙深度是其他路段的2～3倍；（2）长大上坡路段沥青路面车辙变形主要发生在中面层，其次是表面层、下面层；（3）沥青路面结构内的最高温度超过了60℃。（4）在较长的长大上坡路段，重载货车速度在下降后一直维持在20～30Km/h直至坡顶。以此为基础，提出了以满载货车车速作为定义长大上坡路段的指标。利用有限元数值计算法，分析了高温、坡度（水平分力）、车速、重载对长大上坡路段沥青路面应力的影响，结果表明：随着车速的降低，沥青路面应力有较大增长，坡度虽对长大上坡路段沥青路面受力状况的影响较小，但会导致重载车辆车速降低从而产生车辙变形。采用可变速荷载轮新型车辙仪模拟了重载车辆速度变化对沥青路面车辙的影响，不同轮速、温度、荷载条件下的车辙试验结果表明：在重载、高温、低速荷载条件下，以标准车辙试验条件设计的沥青混合料容易形成车辙，采用现行技术规范规定的60℃温度条件评价长大上坡路段沥青混合料高温稳定性不尽合理。采用多级嵌挤密级配设计方法和Superpave方法进行沥青混合料配合比设计，，通过汉堡车辙试验和MMLS3加速加载试验研究了不同沥青（含外掺剂）、不同混合料类型在不同荷载与温度条件下的抗车辙性能，推荐了适用于长大上坡路段的沥青混合料类型及其技术要求。在现场调查和对长大上坡路段沥青路面受力特点分析的基础上，明确了上、中面层是沥青路面产生车辙变形的主要层位。在加速加载试验验证路面结构合理组合及厚度基础上，提出了适用于长大上坡路段的沥青路面结构组合。最后，基于交通管理技术措施，提出了采用夏季高温时段洒水降温、设置专用爬坡车道、调整车道系数和重载车辆分时段通行等技术措施来减轻长大上坡路段沥青路面车辙。
[Abstract]:Effect of traffic load on the continuous uphill sections of asphalt pavement condition compared with the flat slope section, the effect of asphalt pavement under heavy load, time becomes longer, the comprehensive effect of temperature under the continuous uphill sections of Asphalt Pavement Rutting development, formed faster. System to carry out research on rutting resistance of asphalt pavement in long uphill road, is very necessary to effectively control and solve the problem of continuous uphill sections rutting of asphalt pavement.
This paper analyzes the rutting of asphalt pavement on the continuous uphill sections through on-the-spot investigation, temperature distribution within the pavement, changes, heavy truck speed results showed that: (1) the rut, disease is the main disease type on the continuous uphill sections of asphalt pavement, heavy load in the summer high temperature, low speed, vehicle loads, may in the summer the highest temperature within a week or two rapid formation of rut, rut depth usually continuous uphill side is 2~3 times the other sections; (2) the continuous uphill sections of Asphalt Pavement Rutting deformation mainly occurred in the surface layer, the surface layer, bottom layer; (3) the highest temperature in asphalt pavement structure more than 60 degrees. (4) in the long growth uphill road, heavy truck speed has been maintained at 20 ~ 30Km/h in the top until after falling. On this basis, put forward to the full truck speed as The index of the long upslope section.
By using the numerical method of finite element analysis, the temperature gradient (horizontal component), speed, heavy impact on the continuous uphill sections of asphalt pavement stress results show that with lower speed, asphalt pavement stress increased, although the slope of continuous uphill sections affected asphalt pavement stress condition, but will in the heavy vehicle speed reduced to produce rutting deformation.
The variable speed wheel load model rutmeter simulated the effects of heavy vehicle speed change on the rutting of the asphalt pavement, different wheel speed, temperature and load conditions of the rutting test results show that in high temperature, heavy load, low load conditions, the asphalt mixture design standard rutting test conditions to form the rut, evaluate the existing provisions the technical specifications of 60 DEG long uphill section high temperature stability of asphalt mixture is not reasonable.
Using basiced gradation design method and Superpave method of asphalt mixture design, through the hwtd and MMLS3 accelerated loading test of different asphalt (containing additives), different mixture type anti rutting performance under different load and temperature condition, recommended asphalt mixture type and technical requirements for the continuous uphill sections.
In the field investigation and the continuous uphill sections of Asphalt Pavement Based on the analysis of the characteristic of clear, the surface layer of asphalt pavement is the main layer of rut deformation. In the accelerated loading test verify the reasonable combination of pavement structure and thickness on the basis of the asphalt pavement structure is suitable for the continuous uphill sections.
Finally, based on traffic management technology measures, we put forward technical measures to reduce rutting of asphalt pavement on long uphill road, such as sprinkling water and cooling in summer, setting up special climbing lane, adjusting Lane coefficient and passing time between heavy vehicles.

【学位授予单位】：长安大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U416.217

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