1. School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China 2. Chengdu Hydropower Construction Engineering Co.,Ltd.,China Water Conservancy and hydropower Seventh Engineering Bureau,Chengdu 610081,China
Ground penetrating radar (GPR) is an important shallow geophysical detection method for detecting underground structures and their distribution regularity.It has the advantages of high resolution,non-destructiion,strong anti-interference capability and intuitive results,and is widely used in the field of engineering geophysical exploration.In order to improve the understanding of the characteristics of the underground pipeline radar image,determine the location of the abnormal body of pipeline,and improve the interpretation precision of GPR,the authors used FDTD method to detect the underground pipeline,which includes the numerical simulation of the factors affecting the depth of pipeline,material,filling material and pipeline disease.On such a basis,a forward modeling synthetic library of underground pipelines was established to guide the interpretation of the ground-penetrating radar images.The field pipeline detection results show that the ground penetrating radar can accurately detect the buried position and operation status of underground pipelines,and provide a basis for future maintenance.
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