The Application Research of Ground Penetrating Radar in Highway Tunnel Quality Testing

摘要

Along with the development of highway in our country,the tunnel is increasing the proportion of highway construction in mountainous and hilly region.People are putting more and more emphasis on the tunnel quality safety.In order to quickly detect quality problem,we need economic and accurate detection equipment.As a high-performance,advanced non-destructive testing methods,the ground penetrating radar (GPR) can continuously scan the tunnel lining;obtain the image of intuitive graphical detection.The ground penetrating radar is a kind of economical and accurate method for detection highway tunnel quality problems and widely applied to highway tunnel tests.And the effectiveness of the GPR detection in highway tunnel disease detection largely depends on the transmitting frequency.Combined with the practical case,this paper introduces the working principle of the GPR,and discusses the data acquisition method by set reasonable GPR parameters when use GPR detection tunnel quality,signal processing technology and radar wave group characteristics of typical target body,analyzed the radar of wave group characteristics of I-beam in various factors affecting,and using wavelet multiscale transform image enhancement technique enhance the signal-to-noise ratio,amplify display the internal details structure of tunnel,identify then radar wave group characteristics of internal imperfect area,cracking and steel,etc.The waveform characteristics of GPR images is of crucial importance way to enhance the ability of recognizing targets and the research of this paper has useful experience for the similar project in the future.