路面结构层材料介电特性反演及路面雷达应用

【作者】 郭成超；

【导师】 王复明； 张蓓；

【作者基本信息】 郑州大学 ， 岩土工程， 2004， 硕士

【摘要】 路面雷达作为一种高效、快速、连续、无损的路面检测设备，其在路面的重要技术性能指标如厚度、压实度、空隙率、含水量以及沥青含量等中的应用，自80年代以来一直是工程界和相关研究部门的重要研究课题。 本文基于电磁波基本理论和系统识别原理，研究了路面结构层材料复合介电特性及其厚度、压实度、空隙率、含水量和沥青含量等的反演。主要研究成果和结论如下： 1．基于电磁波理论的基本原理，从Maxwell方程着手，建立了雷达电磁波在典型柔性路面结构体系中的传播正演模型。分析了实际路面结构层材料介电常数实部和虚部对雷达反射信号的影响，并得出了相应的结论； 2．基于路面结构层材料介电特性及其厚度反演分析软件SIDTHK，开发出了柔性路面结构层材料介电特性及其厚度反演分析的程序。应用该程序对实际路面的厚度进行检测，提高了检测的精度； 3．研究了材料的复合介电特性及其三相体积比的关系，提出了压实度、空隙率、含水量及沥青含量等技术指标的检测和评价的思路，并对快速检测沥青混凝土路面面层空隙率和压实度作了成功的探索，推导了沥青混凝土路面面层空隙率和压实度计算的方法，编制出了沥青混凝土路面面层空隙率和压实度反演的程序，对面层沥青含量的反演也进行了有益的尝试，并分别应用到实际路面进行了对比分析，对比结果表明了反演方法的有效性。更多还原

【Abstract】 The Ground Penetrating Radar (GPR), which is an effective, speedy, continuous and non-destructive testing equipment, its application in pavement technical characteristics such as thickness, compaction, void content, moisture content and asphalt content etc., has been an active international subject since 1980s.Based on elementary principle of electromagnetic theory and system identification method, the backcafculation of composite dielectric property of pavement structures and its thickness, compaction, void content, moisture content and asphalt content etc, is studied in this paper. The main achievements and conclusions of this paper are summarized below:1. The forwarcl model of GPR electromagnetic wave propagation in typical flexible pavement system is presented based on Maxwell Equation in elementary electromagnetic theory. The influences of the real part and imaginary part of dielectric of actual pavement on reflected GPR waveform are analyzed, and relevant conclusions are gained2. Based on the analytical SIDTHK(System Identification for backcabulating Dielectric and ThicKness of pavement Structures) program, the program for backcalculating dielectric property and thickness of flexible pavement structures is developed, and the acciracy of thickness backcafculation results is improved3. The relationship between composite dielectric property of pavement structures and its volumetric concertrations is studied in this paper. Thus the idea of evaluating compaction, void content, moisture content and asphalt content etc. is raised, and the successful exploration on rapid detection of compaction and void content is made, also the method of backcafculating compaction and void content of asphalt pavement is derived, then the program for backcafculating compaction and void content of asphalt pavement is developed Meanwhile, the worthful attempt is made for backcafculating asphalt content, and the effectiveness of this method is proved from the contrast results.更多还原