Analysis of a Whole-Space Transient Electromagnetic Field in 2.5-Dimensional FDTD Geoelectric Modeling

Jiang, Zhihai; Liu, Shucai; Malekian, Reza

doi:10.1109/access.2017.2754521

Cited by 20 publications

(13 citation statements)

References 17 publications

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“…On the basis of summary and analysis of the FDTD algorithm, the unconditional stability Crank-Nicolson (CN) algorithm with high calculation efficiency and high accuracy for anisotropic magnetic plasma medium was proposed by Yongjia Zhuang [17]. The transient electromagnetism numerical simulation method in total space was studied by Zhihai Jiang et al with the diffusion of the transient electromagnetic field mainly controlled by low specific resistance [18]. With a model of dynamic responses of underground tunnel constructed by Jingcun Yu et al using the FDTD method, the horizontal component was proposed as one new method to process and explain dynamic data of mines [19].…”

Section: State Of the Artmentioning

confidence: 99%

Forward Modeling of Water-Rich Regions in Mines Based on Unconditional Stability Finite-Difference Time-Domain

Tian¹,

Ma²,

Zhou³

2019

JESTR

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Water bursting in mines remains one of the major disasters that threatens safe coal production. The traditional detection techniques of water-rich regions in mines can no longer meet new safe production standards and requirements. To solve the constraints on the selection of traditional finite-difference time-domain (FDTD) step length by the Courant-Friedrichs-Lewy stability condition, the unconditional stability Crank-Nicolson FDTD (CN-FDTD) algorithm was introduced into the detection of underground total space, aiming to further increase calculation speed and detection accuracy. The boundary condition of the perfectly matched layer (PML) and numerical stability condition for mine detection were analyzed by studying the basic principle of CN-FDTD. Meanwhile, a detection model of underground water-rich regions was constructed. Influences of excitation function, frequency of excitation source, distance between the anomalous body and the interface, and size of the anomalous body on water-rich region detection were analyzed through Wavenology EM and MATLAB simulation by using the forward algorithm. Results demonstrate that given the same conditions, the Ricker wavelet excitation source has better detection effect than the Blackman-Harris Window (BHW) Function, Gaussian and Delta excitation sources. When the anomalous body is 70 m away from the interface, the excitation source with a central frequency of 15 MHz is the best detection frequency. In addition, forward modeling reveals that when the anomalous body is 50 m away from the interface, the echo signals of a 3 cubic metres anomalous body could still be detected clearly. Theoretically, the existence of an anomalous body can be determined through this echo signal, and its location can be determined through imaging. The study verifies the effective application of CN-FDTD in water-rich region detection in mines. In addition, CN-FDTD solves the constraints of traditional FDTD by stability condition and increases the accuracy of water-rich region detection in mines. This study provides certain theoretical references for the accurate detection of water-rich anomalous bodies in mines.

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Section: State Of the Artmentioning

confidence: 99%

Forward Modeling of Water-Rich Regions in Mines Based on Unconditional Stability Finite-Difference Time-Domain

Tian¹,

Ma²,

Zhou³

2019

JESTR

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“…The primary field of the transient electromagnetic field was calculated using an analytical formula, and the secondary field was obtained by time domain finite difference method. In the study of whole-space transient electromagnetics, the 2.5-dimensional transient electromagnetic forward response method is implemented by the finite difference method [6], which is used to simulate electric field distribution characteristics of the geoelectric model of the collapse column in front of the roadway. The iterative finite-difference time-domain method of the staggered grid is also applied in the forward response of three-dimensional transient electromagnetic field [7]- [9].…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Whole Space Transient Electromagnetic Forward Response of Magnetic Moment in Arbitrary Direction

Zhang

Liu

2021

IEEE Access

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In the two-dimensional Cartesian coordinate system, a transient electromagnetic forward algorithm of the magnetic moment in arbitrary direction is developed to simulate the electromagnetic response characteristics of the whole space geoelectric model. The magnetic moment Mr in arbitrary transmitting direction is decomposed into Mx and My. The transient electromagnetic fields excited by the magnetic moments Mx and My are forwarded separately, and then synthesized to obtain the electric field excited by the magnetic moment Mr. The time domain iteration's results of the uniform whole space are compared with the analytical solutions to verify the correctness of algorithm. The comparison results show that the algorithm is reliable and can be used for whole space transient electromagnetic simulation in an arbitrary direction. The forward response of the magnetic moment in an arbitrary transmitting direction removes the shortcomings of the traditional two-dimensional whole space transient electromagnetic simulations where the magnetic moment can only be in the horizontal or vertical direction. The program code can be used for the forward response of other two-dimensional whole space geological mining models. It is of great significance to study the two-dimensional transient electromagnetic diffusion characteristics of different geological models by the sector sweeping method.

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“…Mine TEM cannot apply the theory of traditional ground TEM directly because it collects data in underground full space. Moreover, the collected data are disturbed by metallic materials, cables, and other facilities in the roadway, which increase the difficulty of inversion [8].…”

Section: Introductionmentioning

confidence: 99%

2.5-D Inversion of Advanced Detection Transient Electromagnetic Method in Full Space

et al. 2020

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The transient electromagnetic method (TEM) can be applied in detecting coal mining heading face with multiple angles. However, a 1-D inversion scheme cannot fit this kind of multi-angle data-receiving system well, nor reducing detection accuracy. Developing a 2.5-D inversion method is necessary for TEM multi-angle data. The expressions of the vertical and horizontal magnetic dipole source at any position in the layered medium are derived on the basis of the potential function and the boundary conditions of the electromagnetic field. Then, the electromagnetic field of the magnetic dipole source with multiple angles can be obtained through vector stacking. A low-resistance anomalous body above the roof in front of a roadway excavation was identified by applying a 2.5-D least square inversion method in mine TEM-advanced detection to verify the effectiveness of the inversion method. Moreover, the method was used to detect water inrush from one side of the roadway in a coal mine in Shandong Province, China. Furthermore, the inversion results were verified by the information of boreholes and excavation. The proposed 2.5-D inversion method has a higher interpretation accuracy and resolution than the 1-D inversion method of the model and the measured data. INDEX TERMS Mine transient electromagnetic method, advanced detection, arbitrary angle field source, 2.5-dimensional inversion, damped least squares method.

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Analysis of a Whole-Space Transient Electromagnetic Field in 2.5-Dimensional FDTD Geoelectric Modeling

Cited by 20 publications

References 17 publications

Forward Modeling of Water-Rich Regions in Mines Based on Unconditional Stability Finite-Difference Time-Domain

Forward Modeling of Water-Rich Regions in Mines Based on Unconditional Stability Finite-Difference Time-Domain

Two-Dimensional Whole Space Transient Electromagnetic Forward Response of Magnetic Moment in Arbitrary Direction

2.5-D Inversion of Advanced Detection Transient Electromagnetic Method in Full Space

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