【作者】 杨兵；

【导师】 张蓓； 钟燕辉；

【作者基本信息】 郑州大学 ， 道路与铁道工程， 2010， 硕士

【摘要】 压实度是沥青混凝土路面面层质量控制中的一项重要技术指标。而目前我国对于沥青混凝土路面压实度的检测仍然依赖于钻芯取样等人工破坏性方法,这些方法速度慢,效率低,显然已经不能与我国道路建设日新月异的发展现状相适应。因此,急需研发快速、高效、无损的沥青混凝土路面压实度检测技术。探地雷达(GPR)是一种快速、高效的道路无损检测设备,目前代表了沥青混凝土路面面层压实度检测技术的发展方向。但是现阶段探地雷达应用于路面压实度检测主要是通过现场试验获得介电常数和压实度的相关关系,这种方法不仅对路面具有一定的破坏性,而且相关关系缺乏通用性。本文基于以上研究现状,开展沥青混凝土路面压实度的反演。主要研究内容和结论如下：(1)基于试验对几种经典的介电常数模型进行了改进,并研究了沥青混凝土材料复合介电特性和压实度的关系以及压实度与沥青混合料中骨料、沥青和空气三相体积比的关系。(2)基于雷达电磁波基本原理,针对沥青路面的结构特点,建立了具有复合介电特性的探地雷达电磁波在沥青混凝土路面中的传播模型,并编制了相应的程序。计算结果表明该模型是合理有效的。(3)基于建立的探地雷达电磁波在沥青混凝土路面中的传播模型,结合系统识别理论,研究了沥青混凝土路面复合介电特性反演方法,并根据路面压实度与介电常数的关系,提出了基于改进介电常数模型的沥青混凝土路面面层压实度反演方法,并编制了相应的程序。(4)通过试验,将基于改进介电常数模型的压实度反演结果与经典模型下的反演结果以及钻芯取样检测结果相对比。结果表明,本文方法具有精度高、快速、连续、无损伤等特点。本文研究成果为探地雷达在沥青混凝土路面压实度检测的应用提供了新的思路和可行性研究。更多还原

【Abstract】 Compaction degree is the quality control of asphalt concrete pavement surface of an important technical indexes. But at present for the asphalt concrete pavement compaction test still rely on such destructive sampling method of artificial got the traditional method, and apparently had not road construction adapt to changing the status quo. Therefore, it is urgent to fast development of asphalt concrete pavement, nondestructive testing technology surface compaction degree.GPR is a new kind of nondestructive testing equipment, and the way of asphalt concrete pavement layer represents the compaction test technology development direction. But the present GPR application in pavement compaction test is mainly related to get through the field experiment, this method of pavement has certain destructive and lack of correlation.Based on the above of asphalt concrete pavement compaction test, the situation of asphalt concrete pavement compaction of inversion. The main research contents and the conclusions are as follows:(1) Based on the experiment on the dielectric constant of classical model. The study of asphalt concrete composite dielectric properties and the degree of compaction and the relationship between the degree of compaction and asphalt mixture asphalt aggregates, in three parts and air volume.(2) Based on the basic principle of electromagnetic wave radar, according to the structure characteristics, the characteristic of complex dielectric in GPR wave propagation models of asphalt concrete pavement, and the corresponding program Calculation results show that the model is reasonable and effective.(3) Based on the established in GPR wave propagation models of asphalt concrete pavement, system identification theory, the study of asphalt concrete pavement of dielectric properties of composite inversion, and according to the pavement compaction and the dielectric constant of the relationship, and puts forward the improved model based on the dielectric constant of asphalt-concrete surface course compaction inversion method, and the corresponding program.(4) Through the experiment, will be based on the improved model of dielectric constant of compaction inversion and classical model inversion and got test results compared, the results showed that this method is of high precision, fast and continuous, no damage, etc.This research for GPR in asphalt concrete pavement compaction test application provides new ideas and feasibility studies.更多还原