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Determination of the resistivity distribution along underground pipes in urban contexts using galvanic and capacitive methods

Abstract : Renovation of water and central heating pipelines is a very costly and time-consuming process, so a way to prioritize the limited resources between different parts of the systems is very important. The risk for corrosion damage can be assessed from the resistivity of the ground, due to the processes facilitating the metal oxidation also affecting the resistivity, but galvanic resistivity mapping is time consuming and workintensive in paved areas. To determine the resistivity in the vicinity of pipes two different resistivity methods were applied: electrical resistivity tomography, using galvanic coupling, and the logistically easier and rapid electrostatic measurements, using capacitive coupling. The two methods were tested in a series of experiments undertaken in the province of Scania in southern Sweden with the aim to acquire better knowledge about the electrical resistivity of the soil surrounding heating and water distribution pipes, in order to better assess the corrosivity of the environment. From the experiments it is shown that the electrical resistivity tomography and electrostatic methods mostly give comparable results for the shallow investigated depths in focus here, where differences might be caused by different sensitivities and noise characteristics. In the case of both methods, it is shown, with the help of modelling of the different expected ground models including the pipes, that the pipes only influence the data in cases of pipes of very large diameters or those buried at a very shallow depth, even without any protective surface coating. The missing influence of the pipes on the data makes the methods very applicable for knowing the resistivity of the soil surrounding the pipes and thus evaluation of corrosion risk.
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https://hal.sorbonne-universite.fr/hal-03049924
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Submitted on : Thursday, December 10, 2020 - 9:38:16 AM
Last modification on : Wednesday, February 24, 2021 - 3:10:04 PM

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Simon Rejkjær, Cécile Finco, Cyril Schamper, Fayçal Rejiba, Alain Tabbagh, et al.. Determination of the resistivity distribution along underground pipes in urban contexts using galvanic and capacitive methods. Near Surface Geophysics, European Association of Geoscientists and Engineers (EAGE), 2020, ⟨10.1002/nsg.12135⟩. ⟨hal-03049924⟩

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