Geotechnical, Geoelectric and Tracing Methods for Earth/Rock-Fill Dam and Embankment Leakage Investigation

Nan, Shenghao; Ren, Jie; Zhang, Lei; Li, Hongen; Ma, Zhaoyang; Kang, Jie; Guo, Hengle

doi:10.1007/s10712-023-09806-8

Surv Geophys

2023

DOI: 10.1007/s10712-023-09806-8

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Geotechnical, Geoelectric and Tracing Methods for Earth/Rock-Fill Dam and Embankment Leakage Investigation

Shenghao Nan,

Jie Ren,

Lei Zhang

et al.

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2024

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Cited by 2 publications

References 236 publications

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Feasibility of induced magnetic gradient surveying for seepage detection in earth-filled dams: Insights from synthetic and field studies

Hu,

Wang,

Tang

et al. 2024

GEOPHYSICS

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Seepage is a common hydrogeological hazard in engineering. Determining the seepage paths is vital for de-risking the instability of embankment structures. With the improvement of the acquisition accuracy of magnetic sensors, the magnetometric resistivity method has become an emerging technology for detecting seepage paths through earth-filled dams. This technique is non-destructive and gives prominent signals. However, the resulting magnetic data have seen ambiguity in fully determining the targets. We propose an induced magnetic gradient surveying approach to monitor seepage paths in earth-filled dams. First, we briefly review the electromagnetic theory for the magnetic gradient tensor based on Maxwells equations. To match against the measurements, we present an accurate modeling framework using the third-order finite element method and a novel compact difference scheme. We verify our approach on both semi-analytical 1D and 3D models. Systematic modeling studies are then carried out to investigate the spatial distribution characteristics and sensitivities of the induced magnetic gradient to the seepage in typical dam scenarios. In addition, we conducted two field experiments in the Zhongmou experimental base and Xixiayuan Reservoir in Henan Province, China,respectively. The induced magnetic field vector and its gradient components were both acquired. Cross-validation with a-priori geological information shows that the seepage path can be spatially identified by the induced magnetic gradient components Byy, Byz, Bzy, and Bzz while the field components failed to locate the seepage pathways. This successful application indicates that the proposed approach could be a promising solution for seepage path discrimination in earth-filled dams with high resolution.

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Feasibility of induced magnetic gradient surveying for seepage detection in earth-filled dams: Insights from synthetic and field studies

Hu,

Wang,

Tang

et al. 2024

GEOPHYSICS

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Identification of Subsurface Cavities by Geoelectric Method

Simpen,

Widya Pratiwi,

Nustriyanti

2024

ejaset

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Research has been conducted on the identification of subsurface cavities using geoelectric methods. Subsurface cavity is a natural phenomenon that commonly occurs in areas that have limestone rocks. The existence of underground cavities can result in the occurrence of ablesan in the form of sinkholes. Sinkholes have occurred in several places with varying sizes. Sinkhole as a result of underground cavity, this cavity is very dangerous to the building above it. For this reason, cavity identification needs to be done before starting construction. In this study, cavity identification was carried out using geoelectric methods. The research took three different locations, two where voids were already visible and one as a case study. The result is that the geoelectric method can detect voids very clearly. The gelistrik method is highly recommended as one of the methods to detect voids in the subsurface.

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Geotechnical, Geoelectric and Tracing Methods for Earth/Rock-Fill Dam and Embankment Leakage Investigation

Cited by 2 publications

References 236 publications

Feasibility of induced magnetic gradient surveying for seepage detection in earth-filled dams: Insights from synthetic and field studies

Feasibility of induced magnetic gradient surveying for seepage detection in earth-filled dams: Insights from synthetic and field studies

Identification of Subsurface Cavities by Geoelectric Method

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