Response and Application of Full-Space Numerical Simulation Based on Finite Element Method for Transient Electromagnetic Advanced Detection of Mine Water

Guo, Changang; Tingjiang, Tan; Ma, Liuzhu; Chang, Shuai; Chen, Yiding; Zhao, Ke

doi:10.3390/su142215024

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…Chang et al [52] used TEM with a full-space model to detect groundwater in the goaf of a coal mine. Guo et al [53] used full-space transmission electric mirrors to detect water collapse columns in coal mines in advance. As shown in Figure 9, the elevation higher than 890 m with the resistivity lower than 70 Ω•m represents unconsolidated sediments in the Quaternary formation, the thickness of this layer changed at different area, the thickness at the ridge is thicker than valley.…”

Section: Transient Electromagnetic Methodsmentioning

confidence: 99%

Methods for the Geophysical Exploration and Sustainable Utilisation of Coalbed Methane Resources in Abandoned Mines of Shanxi, China

Liu,

Li,

2024

Sustainability

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Underground coal mining results in large goafs and numerous abandoned mines that contain substantial amounts of coalbed methane. If this methane is not used and controlled, it will escape into the atmosphere through geological fractures and can result in serious greenhouse gas effects and environmental damage. Exploring and developing the coalbed methane resources of abandoned mines can not only improve coal mine safety and protect the ecological environment but also reuse waste and mitigate energy shortages. Geophysical methods have made some progress in detecting abandoned coal mines, but there are still some challenges and difficulties. The resolution of seismic exploration may not be enough to accurately describe the details of coal seams and CBM rich areas, and the effect of resistivity method in deep CBM exploration is limited. In addition, the geological structure of abandoned coal mines is usually more complex, such as faults, folds, etc., which makes the application of exploration methods more difficult and increases the difficulty of data interpretation. Therefore, it is necessary to develop and perfect exploration technology continuously including the application of geophysical big data, deep learning, and artificial intelligence inversion to realize the accurate detection and evaluation of CBM resources in abandoned coal mines.

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Section: Transient Electromagnetic Methodsmentioning

confidence: 99%

Methods for the Geophysical Exploration and Sustainable Utilisation of Coalbed Methane Resources in Abandoned Mines of Shanxi, China

Liu,

Li,

2024

Sustainability

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“…At present, many studies have been conducted on the use of TEM for ground transmission, downhole, or borehole reception, but little research has been conducted on the use of TEM for borehole transmission and borehole reception. Research has mainly focused on numerical simulations of small multi-turn coils based on the whole space TEM theory [20][21][22] and discussion of the transient electromagnetic response characteristics of small coils, as well as inversion interpretation and analysis methods [23,24].…”

Section: Introductionmentioning

confidence: 99%

Borehole transient electromagnetic response calculation and experimental study in coal mine tunnels

Sun,

Ding,

Sun

et al. 2024

Meas. Sci. Technol.

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Water damage seriously threatens the safe production of coal mines, so it is necessary to carry out advanced detection to determine the hydrogeological situation, and the preliminary survey often involves the drilling of on-site drill holes in the tunnel. The use of directional drill holes, combined with advanced geophysical prospecting technology, enables advanced water disaster detection with long distance and high precision and is independent of the tunnel environment influence. The transient electromagnetic method is highly sensitive to low-resistivity anomalies and plays a crucial role in water damage detection. To address the size limitation of borehole detection, in this study, a small rectangular multi-turn loop borehole advanced detection method was developed (borehole transient electromagnetic method, BTEM) to detect low-resistivity anomalies within 10 m of the borehole in the radial direction. To satisfy the size requirements for borehole detection and the detection distance, a small rectangular multi-turn loop device with a width of 6 cm and a length of 50 cm was designed. To resolve the issue of self-inductance and mutual inductance enhancement caused by multi-turn coils, a uniform full-space low-resistivity abnormal body model was established using the Ansys Maxwell software, and we analyzed the vertical magnetic field component of the rectangular multi-turn small loop at different time points and the transient electromagnetic response of the different turns. Then, we determined the appropriate parameters for the transmitting and receiving device. The developed method was applied to several different experimental scenarios to obtain the electrical distribution of the anomalous body in front of the device, and the measured data were inverted and interpreted to obtain the apparent resistivity-depth profile. The results demonstrate that the inversion results align well with the actual situation, confirming the effectiveness of the BTEM.

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Simulation and analysis of the transient electromagnetic method response in double-layer water-filled goaf in coal mines

Yu,

Ma,

Xue

2024

Journal of Geophysics and Engineering

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The resolution ability of the transient electromagnetic method (TEM) for double-layer water-filled goaf is affected by the low resistance shielding effect of the overlying strata. Currently, there is a lack of quantitative research on how the parameter changes of the upper water-filled goaf affect its resolution capability. In this study, through numerical and physical simulations, the relative error of the TEM response between single- and double-layer water-filled goafs was regarded as the evaluation index to analyse and summarize the resolution capability of the TEM for double-layer water-filled goaf under different burial depths, thicknesses, and areas of the upper water-filled goaf. The results are summarized as follows. (ⅰ) The resolution capability of the TEM for double-layer water-filled goaf decreased with the increasing burial depth, thickness, or area of the upper water-filled goaf. (ⅱ) The rate of decrease in resolution gradually accelerated as the burial depth increased. Conversely, as the thickness increased, the decrease rate in resolution gradually reduced. Furthermore, the resolution decreased rapidly and then tended towards a fixed value as the area increased. (ⅲ) The maximum value of the relative error curve moved towards the early stage with the increasing burial depth, resulting in a detection depth of the target body smaller than the actual value. Moreover, it moved towards the later stage with the increasing thickness or area, resulting in a detection depth of the target body greater than the actual value.

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Response and Application of Full-Space Numerical Simulation Based on Finite Element Method for Transient Electromagnetic Advanced Detection of Mine Water

Cited by 4 publications

References 26 publications

Methods for the Geophysical Exploration and Sustainable Utilisation of Coalbed Methane Resources in Abandoned Mines of Shanxi, China

Methods for the Geophysical Exploration and Sustainable Utilisation of Coalbed Methane Resources in Abandoned Mines of Shanxi, China

Borehole transient electromagnetic response calculation and experimental study in coal mine tunnels

Simulation and analysis of the transient electromagnetic method response in double-layer water-filled goaf in coal mines

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