Electrical resistivity tomography through reinforced concrete floor

Yang, Lichun1; Yang, Dikun1,2; Yuan, Quan3

2023-11-01

10.1002/nsg.12285

NEAR SURFACE GEOPHYSICS   影响因子和分区

1569-4445

1873-0604

The electrical resistivity tomography (ERT) method is often challenged by the presence of reinforced concrete (RC) in urban and industrial environments, because the embedded metallic wire mesh can severely distort the distribution of subsurface currents. We investigate one typical scenario in real applications, in which an RC floor overlays the natural topsoil or rock. Our synthetic forward simulations show that the embedded wire mesh behaves like a local good conductor in data of small source-receiver separations and acts like an equal-potential object that keeps the potential from decaying at large source-receiver separations. Routine ERT inversions that ignore the RC cannot work properly because the thin and highly conductive wire mesh may be manifested as large uninterpretable low-resistivity anomalies in the imaging results. Two remedies are adopted to improve the ERT resolution in such cases. First, we find a top layer with high conductivity in our model to adequately represent the wire mesh; then, we initiate the inversion with the top-layer model as the starting and reference model. This warm-start approach overcomes the difficulty of recovering the large conductivity contrast between metallic objects and regular earth materials. Second, underground electrodes are added to the survey array, so more information from depth can be obtained to fight against the dominance of current channelling in the wire mesh. Finally, our strategies are used to invert a real ERT dataset from an indoor manufacturing plant, where RC covers the entire floor of the building and electrodes are in contact with the soil through open holes in the floor. Our simulation and field data inversion verify our findings and demonstrate the effectiveness of our solutions in improving the resolution of ERT when the survey is carried out over RC floor in urban and industrial environments.

ERT engineering inversion resistivity

SCI

英语

第一 ; 通讯

Guangdong Provincial Key Laboratory of Geophysical High-Resolution Imaging Technology[2022B1212010002] ; null[2021KTSCX105]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001110362000001

WILEY

2-s2.0-85178242656

Web of Science

1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Guangdong, Peoples R China
2.Southern Univ Sci & Technol, Guangdong Prov Key Lab Geophys High Resolut Imagin, Shenzhen, Guangdong, Peoples R China
3.Geomative Co Ltd, Shenzhen, Guangdong, Peoples R China

Yang, Lichun,Yang, Dikun,Yuan, Quan. Electrical resistivity tomography through reinforced concrete floor[J]. NEAR SURFACE GEOPHYSICS,2023,22(1):47-59.

Yang, Lichun,Yang, Dikun,&Yuan, Quan.(2023).Electrical resistivity tomography through reinforced concrete floor.NEAR SURFACE GEOPHYSICS,22(1),47-59.

Yang, Lichun,et al."Electrical resistivity tomography through reinforced concrete floor".NEAR SURFACE GEOPHYSICS 22.1(2023):47-59.