Abstract: This paper introduces the basic principles of the borehole magnetic survey method. The borehole magnetic survey method was used to detect metal pipelines, stormwater and sewer pipelines that containing ferromagnetic materials and nonmetallic pipelines with holes through which strong ferromagnetic bars can be inserted and have achieved good results. Through the analysis and the study of detection results, it is proved that the borehole magnetic survey method is feasible for the detection of deeply buried pipelines containing ferromagnetic materials, and the detection accuracy is related to the plane position of the measured hole, but not related to the buried depth of the pipelines. The detection errors of this method can meet the engineering needs and relevant specification requirements, and the detection results can provide scientific basis for engineering design and construction. This paper summarizes the procedures of the borehole magnetic detection pipelines, the main sources of errors, the technical measures to reduce errors and the advantages and disadvantages of the detection methods. It also provides references for improving the detection efficiency of deeply buried pipelines containing ferromagnetic materials and reducing errors.

Key words: Borehole Magnetic Survey Method, Deep Buried Pipelines, Sources Of Errors, Technical Measures, References