电气化铁路隧道衬砌质量检测精度研究

Research on Accuracy of Quality Detection of Electrified Railway Tunnel Lining

针对我国既有电气化铁路隧道,空气耦合式探地雷达开始应用于隧道衬砌质量检测当中,其检测精度成为其应用的关键。应用Gpr Max二维模拟软件,结合空气耦合式探地雷达实际检测背景,对隧道衬砌5种实际工况进行模拟。通过建立各种工况不同尺寸隧道病害模型,对分界层进行识别,并对其进行逼近分析,计算衬砌及病害层厚度。根据反射回波特性,分析隧道衬砌及病害界面反射时间,探究空气耦合式探地雷达对隧道病害识别的精度,研究证明检测结果可以很好反映隧道衬砌实际情况。对探地雷达隧道检测数据分析及检测结果判定提供了理论依据,为探地雷达隧道衬砌质量在实际应用中隧道缺陷和病害能否识别以及识别分辨率问题提供了依据。

Air-coupled Ground Penetrating Radar （ GPR） has began to be applied in the quality detection of tunnel lining, especially for the existing electrified railway tunnels in China, and the detection accuracy remains the key to the application. Based on the engineering application of the Air-coupled Ground Penetrating Radar, five kinds of working conditions of tunnel lining are simulated with GprMax two-dimensional simulation software. Tunnel defect models of different sized under different working conditions are established to identify the boundary layer, analyze the approximation and calculate the thicknesses of lining layer and defect layer. The reflection time of tunnel lining layer and tunnel defects are obtained according to echo characteristics, and the recognition accuracy of tunnel defects is identified with air-coupled GPR. The results show that the results of detection truly reflect the actual conditions of tunnel lining, providing a theoretical basis for tunnel detection data analysis and detection results assessment, and providing references for the recognition and accuracy of quality and defects defection for tunnel lining in the practical application of GPR.