探地雷达检测公路结构层裂缝实用方法研究

在简要介绍探雷达基本原理及裂缝在雷达剖面上的波组特征基础上,从垂直裂缝数学模型开始,由简单到复杂,按照理论分析数值模拟——物理模拟——现场试验这一流程对探地雷达检测裂缝的理论、方法和实际应用效果进行了系统的分析研究。总结出由单一均匀介质到多层均匀介质等不同情况下裂缝的波组特征规律和检测裂缝的基本方法。由公路工程探测实践表明数值模拟、物理模拟和检测应用具有很好的一致性。采用探地雷达检测公路结构层中的垂直裂缝具有充分的理论依据,实践上是切实可行性的。探地雷达检测裂缝时应选取足够小的横向采样点距和适当主频的天线,并采用合理的处理参数对雷达资料进行分析处理,才能得到直观、可靠的裂缝检测结果。该方法可以对公路结构层中隐含的裂缝进行准确定位,为高速公路路况监控和养护提供了一种新的检测手段。

Study on Highway Structure Layer Crack Detection by Ground Penetrating Radar

Based on the principle of the ground-prospecting radar and the wave group features of the cracks taking on the radar section plan,the theory,method and the application of cracks detection by ground penetrating radar is researched.The research started from the mathematical model of the vertical crack and followed the process from simple to complex,including numerical simulation,physical simulation and spot validation.The wave group characteristic pattern of the cracks of multiple cases from single even media to multi-layer even media is summarized.Then the method used for detecting the cracks was developed.The detection practice of the highway shows the nice consistency among the numerical simulation,physical simulation and the spot validation.Sufficient theoretic research and practical evidence proved that it is feasible to adopt the ground penetrating radar to detect the vertical cracks in the structural layer of the highway.When using the ground penetrating radar to detect the cracks,the transverse sample interval should be small enough and the main frequency for the antenna should be appropriate,and the processing parameters for analyzing and processing the radar data should be reasonable,thus the intuitional and reliable results for the crack detection can be attained.The method here can locate the cracks hiding in the structural layer of the highway correctly and provides a new detection way for monitoring and maintaining the highway.