基于江西南部地区温度条件的沥青路面健康性能预测

发布时间：2018-01-11 01:14

本文关键词：基于江西南部地区温度条件的沥青路面健康性能预测　出处：《长安大学》2015年博士论文　论文类型：学位论文

【摘要】：目前的路面性能检测主要是定期的人工检测,局限性比较多,且仅当路面表面病害出现后才能检测,难以及时的发现路面结构的内部损伤。其属于对路面损伤结果的检测,而非对可能出现损伤的预测,因此基础上制定的预防性养护措施,也只属于路面产生病害后的常规养护,并非真正意义上的预防性养护。因此需要发展利用传感器和损伤识别技术进行结构响应与状态的在线检测,同时能够实时的识别路面性能状态和潜在的损伤。本文据此提出沥青路面的健康监测理念和评价体系,为路面的设计、施工、试验和维修决策提供性能状态信息和科学决策依据。主要的研究内容如下:针对沥青路面损伤类型和原因,对沥青路面的控制破坏模式进行调研,半刚性基层沥青路面的两种典型的控制损坏模式为:开裂和永久变形。对于开裂类损坏,主要的控制破坏模式为半刚性基层的疲劳开裂、沥青层的疲劳开裂;永久变形的控制破坏模式主要是沥青层的变形。结合国内外相关研究的基础上,提出沥青路面健康检测评价体系,对现行沥青路面的评价预估模型进行调研和选择。健康性能识别时可通过半刚性基层\面层层底的拉应力(变)、沥青面层的车辙通过各分层的竖向压应力的监测来识别。提出基于全时域内的路面健康监测方法,论述了路面全时域叠加路面损伤分析思路和方法。通过在江西南部地区高速公路上实测的温度场数据,对沥青路面的温度效应和晴天、多云、降雨等天气形态下的路面温度场分布进行研究;分析了平原区、丘陵区和山区三种地形条件下的温度场分布特征和路堤、路堑等局地地形条件对路面的温度效应,对沥青路面内部的温差和温度梯度分布规律进行统计。根据实测结果建立了三种地形条件下的温度预估模型和温度调整系数。沥青混合料的动态模量是力学经验设计方法体系中非常关键的材料设计参数。对温度与频率影响动态模量的规律研究,给出了SMA-13、AC-20、ATB-25沥青混合料的动态模量主曲线。借助Witczak动态模量的预估模型,根据实际路面温度场的测试,对路面各层混合料动态模量进行温度修正,并对实测温度场下各沥青层的动态模量分布特征进行分析。依据现场力学响应结果,建立了基于动态模量的沥青路面力学分析模型。对比分析了单轴荷载和多轴荷载作用下路面力学响应影响,考察了荷载、速度、温度及路面不平度对路面力学响应的影响,并对不同行车速度和路面深度下的荷载作用频率进行研究。根据实测的温度场,依据沥青混合料动态模量随温度的变化规律,分析了正负温差路面的力学响应、日温度分布的力学响应、月极端温度的路面力学响应和不同天气状态下沥青路面的力学响应。基于响应面方法,研究了层位温度与路面力学响应的关系,对层位温度的敏感性进行分析。而后建立了温度—荷载—行车速度共同作用下的路面力学响应预测模型。并对实时温度下的沥青路面健康状态进行了预测。分析了对现有养护决策的不足,提出了基于沥青路面健康监测的养护决策方法。
[Abstract]:At present, the pavement performance test is mainly manual inspection regularly and limitations more, and only when the pavement surface can be detected, it is difficult to discover the internal damage of pavement. It belongs to the detection results of pavement damage, rather than the possible damage prediction, preventive maintenance measures therefore formulated on the basis of the road is only a kind of routine maintenance of disease, is not the true sense of the preventive maintenance. So we need the development of on-line detection of structural response and state using sensor and damage identification technology, and state recognition of pavement performance and potential damage to real time. This paper puts forward the concept of asphalt pavement health monitoring and evaluation system for pavement design, construction, provide the performance information and scientific decision-making on the basis of test and maintenance decision. The main contents are as follows: Based on the asphalt The pavement damage types and causes, the failure mode control of asphalt pavement research, two typical control of semi-rigid asphalt pavement damage model: cracking and permanent deformation. The cracking damage, fatigue failure modes of the main control for semi rigid base crack, fatigue cracking of asphalt layer; permanent deformation control the failure mode is the main deformation of asphalt layer. Based on relevant research at home and abroad, put forward asphalt pavement health testing evaluation system, evaluation of the current asphalt pavement prediction model research and selection of health. When can identify the semi-rigid surface bottom layer tensile stress (strain), monitoring of asphalt surface the rutting compressive stress by vertical layers to identify. Put forward pavement health monitoring method based on the time domain, the time domain road pavement damage superposition analysis ideas and methods. In the southern Jiangxi area temperature field data measured on the highway, the temperature effect on the asphalt pavement and sunny, cloudy, the pavement temperature field distribution of rainfall and other weather patterns; analysis of the plain area, the temperature field of three kinds of terrain in Hilly and mountainous areas of the distribution and the temperature effect on the embankment. Road cutting and other local terrain conditions, the statistics of the asphalt pavement internal temperature and temperature gradient distribution was established. According to the experimental results of three kinds of terrain conditions of temperature prediction model and temperature adjustment coefficient. The dynamic modulus of asphalt mixture material design is the most crucial parameters system of mechanics empirical method. Study on dynamic law the modulus of the influence on the temperature and frequency are SMA-13, AC-20, ATB-25 asphalt mixture dynamic modulus master curve of dynamic modulus prediction model. With the help of Witczak, based on When the temperature field of pavement pavement test, each layer of mixture dynamic modulus of temperature correction, and the dynamic characteristics of the measured temperature field under the asphalt layer modulus distribution were analyzed. On the basis of field mechanical response results, established the analysis model of Asphalt Pavement Based on dynamic modulus was analyzed. The influence of pavement mechanical uniaxial load and multi axial loads, effects of load, speed, temperature and surface roughness influence on the response of the pavement, and carry on the research of load frequency on different vehicle speed and depth of pavement. According to temperature measurement, based on the dynamic modulus of asphalt mixture with temperature variation, analysis of mechanical response positive and negative temperature of pavement, the mechanical response on temperature distribution, mechanical response of asphalt pavement on pavement mechanical response to extreme temperatures and different weather conditions. Based on response surface method, Study on the relationship between temperature and mechanical response of pavement layer, layer temperature sensitivity to were analyzed. Then build the pavement mechanical interaction of temperature - load speed response prediction model. And the real-time temperature of asphalt pavement condition was predicted. The analysis of the existing issues of maintenance decision, is proposed asphalt pavement maintenance decision method based on health monitoring.

【学位授予单位】：长安大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：U416.217

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