Abstract
Underground pipelines are the lifelines of a modern city. The precise positioning of underground pipelines is essential to avoid pipeline damage during successive construction above it. However, detecting deep-buried pipelines in soft clayey deposits is challenging. This paper proposes a new method called the surface-to-borehole electromagnetic induction method (SB–EIM) by combining the traditional ground EIM with the magnetic gradient response in a borehole. Firstly, a depth measurement method was established based on the magnetic fl ux response to the applied magnetic field in a borehole. Secondly, a theoretical analysis method was proposed to calculate the pipeline depth and its horizontal position using the measured data. By analyzing the magnetic flux response characteristics at different depths, the relationship between the maximum response point and the spatial location of the target pipeline was determined. Finally, an in-situ test was conducted, and the eff ectiveness of the proposed method was verified.
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This research is supported by the National Natural Science Foundation of China (No. 42177126).
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Li Guo-wei is a Professor and doctoral student supervisor at Hohai University, mainly engaged in the research of soft foundation treatment, application of GFRP bars in geotechnical engineering, slope stability and the development of intelligent monitoring systems and instruments.
Zhou Yang is an Associate Professor and doctoral student supervisor; his main research direction is the improvement of soft ground, treatment of dredged slurry and application of geophysical methods in geotechnical engineering.
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Li, GW., Ye, ZM., Zhou, Y. et al. Pipeline positioning by the surface-to-borehole electromagnetic induction method in a clayey deposit. Appl. Geophys. 20, 88–99 (2023). https://doi.org/10.1007/s11770-023-1019-x
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DOI: https://doi.org/10.1007/s11770-023-1019-x