Study On The Application Of GPR In Underground Pipeline Detection

Urban underground engineering construction must carry on the accurate localization of underground pipelines. However, at present the accuracy of many detection methods is not high. Therefore, to deeply analyze and research factors influencing the precision has theoretical and practical significance.Taking underground pipeline as research object, the paper uses GprMax software and MATLAB language to study. The detecting body is simulated in isotropic homogeneous medium to analyze the different parameters effect on pipeline detection. The complex layered model of detecting body is set up. By changing the antenna frequency this simulation study the effect of low frequency antenna on resolution, detecting depth, pipe diameter and pipe material. The results show that 50 ~ 600 MHz frequency antenna can detect 40 mm metal tube in 1 m depth, and based on pipeline section to judge pipe diameter size and filling material.The model of small intervals and non-metallic underground pipes under the condition of complex layer are established. Judge pipe material according to the different radar images of metal pipes and non metal pipelines. The interference factors of the non target, fill imperfect and groundwater is studied. The results suggest that groundwater content has a large influence on detection results. It should be maximum eliminate interference to improve the accuracy in the field detection.Using the advanced GPR technology and Gpr Max software the pipeline detection of an underground engineering is simulated. The simulated images are consistent with the measured result. Theory and practice has proved that detection and image interpretation method used can clearly reflect the characteristics of target and can accurately locate pipeline.