三维探地雷达在城市市政管线渗漏探测中的应用

Application of 3D Ground Penetrating Radar to Leakage Detection of Urban Underground Pipes

摘要:

以城市给排水管网基地测试管道为对象，针对一根埋深0.6 m，直径100 mm水管，通过现场实验探讨三维探地雷达（GPR）探测管线渗漏的可行性。实验中在渗漏点附近沿垂直于管线方向布设了31条平行测线，采集了C扫描雷达数据。对比渗漏前后的二维雷达剖面以及雷达数据三维偏移成像图可知，三维探地雷达可更加有效地探测和识别地下目标几何形态，判断由于地下水管渗漏形成的周围土壤浸润区的范围和大小，从而确定渗漏位置。

Abstract:

Taking the test pipeline of urban water supply and drainage network base as an object, the field experiment was carried out on a buried depth 0.6 m water pipe with a diameter of 100 mm, to explore the feasibility of 3D ground-penetrating radar (GPR) in detecting pipeline leakage. Perpendicular to the pipeline, 31 parallel test lines were set around the leak-point and the C-scan GPR data were collected in the experiment. By comparing the 2D radar profile and 3D migration imaging of radar data before and after the leakage, it is found that 3D GPR can detect and identify the geometric shape of the underground target more effectively, and determine the scope and size of the surrounding soil infiltration area caused by the leakage of underground water pipes, so as to determine the leakage location