Preliminary study on wave field and dispersion characteristics of channel waves in VTI coal seam media

Ji, Guangzhong; Li, Hui; Wei, Jiuchuan; Yang, Shaorui

doi:10.1007/s11600-019-00326-x

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…Due to the dispersion characteristics of channel waves, the use of the stacking migration method will produce more events. Therefore, using the Hilbert transform to calculate the envelope, accurate velocity information is obtained by dispersion analysis when extracting the energy extremes of the Airy phase envelope [25,26].…”

Section: Dispersion Analysis and The Elliptical Tangent Methodsmentioning

confidence: 99%

Quantitative Evaluation of Faults by Combined Channel Wave Seismic Transmission-Reflection Detection Method

Guang

Wang

et al. 2022

Minerals

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The quantitative detection of faults using the channel wave seismic method has been a major but challenging area of interest. In this study, we adopted an effective technical process to evaluate fault attribution. First, we use integrated transmission and reflection channel wave information to improve the accuracy of extraction velocity. Then, the location of the fault is determined by the elliptical tangent offset method, and feature extraction and fault location extension determination are achieved through logistic regression and a neural network. This is combined with the prior geological information, the fractional dimension D to the quantitative analysis of the fault throw. Data regarding the 4203 working face of a mine in Shanxi, China, are considered as an example. Two groups of faults were predicted, with the location error in the f30 fault position as 6.7 m. In addition, the f29 fault throw first increased, and then gradually decreased from the return airway to the haulage gateway. These predicted results have been drill-verified and were used to modify the original design. The proposed method has good stability and promising application prospects for fault evaluation.

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Section: Dispersion Analysis and The Elliptical Tangent Methodsmentioning

confidence: 99%

Quantitative Evaluation of Faults by Combined Channel Wave Seismic Transmission-Reflection Detection Method

Guang

Wang

et al. 2022

Minerals

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“…Because the coal seam density is lower than the surrounding rock density, the wave conduction velocity in the coal seam is low. The density and velocity ratio of coal to surrounding rock is about 1:1.5 1:3, the interface between coal seam and roof and oor is a wave impedance interface (He et al 2017;Ji et al 2019). When the seismic source releases energy in the coal seam, except for a small amount of energy scattering, most of the energy propagates in the coal seam and overlaps each other, interfering with each other to form a in-seam wave (Yang et al 2011;Wang et al 2018;Su et al 2020).…”

Section: In-seam Wave Formation Processmentioning

confidence: 99%

Study on In-seam Wave Response Characteristics of Reflection in Fault Bearing Coal Seam of Shuangliu Coal Mine

Zhang

Wei³

et al. 2021

Geotech Geol Eng

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In order to study the response characteristics of re ected trough in-seam wave in fault bearing coal seam, nd out the geological structure of coal mine, and ensure the scienti c and safe mining of coal mine, the physical property parameters of coal and rock samples of No.3 Coal Seam in Shuangliu Coal Mine were determined, and the three-dimensional numerical analysis model of homogeneous isotropic medium was established. The full wave eld forward modeling of elastic wave equation was carried out by using the nite difference method. In this paper, the dispersion curve of No.3 Coal Seam in-seam wave detection in Shuangliu Coal Mine is studied. The results show that under the geological conditions of Shuangliu Coal Mine, the dispersion curves of in-seam wave are obviously different when the coal thickness is 1m, 3m, 5m and 8m; The dispersion curve of re ected in-seam wave in goaf is disordered, which is obviously different from that of normal coal; The Airy phase velocity of in-seam wave in No.3 coal seam of Shuangliu Coal Mine is about 100 0 m/s, and the dominant frequency is 140 Hz. The conclusions are as follows: the formation of in-seam wave in the mining area is related to the direct roof and oor, but not to the indirect roof and oor; When the wave velocity difference between the roof and oor is large, the better dispersion response of Airy phase.

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“…The commonly used methods for detecting geological structures inside mining working faces and roofs and floors include wireless electromagnetic wave analysis [3,4], in-seam seismic exploration [5][6][7], the mine transient electromagnetic method (TEM) [8][9][10], and the mine direct current (DC) resistivity method [11,12]. Wireless electromagnetic wave perspective technology uses high-frequency electromagnetic waves to detect geological isomers inside the working face.…”

Section: Introductionmentioning

confidence: 99%

Research and Application of the Mine 3D DC Resistivity Method for Detecting Grouting in the Floor of an Ultrawide Working Face, Taking the Yongmei Xinqiao Coal Mine in Henan Province as an Example

Li,

Wang

et al. 2024

Water

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Generally, ground grouting is used to treat confined water areas before mining at the working face, but there is a lack of testing methods for determining the effectiveness of such a grouting treatment on the floor of ultrawide working faces. Therefore, we propose a 3D DC resistivity method for mines and apply it to the detection of the effect of grouting on the mine floor. This study took the Yongmei Xinqiao Coal Mine in Henan Province as the research object and used a combination of theoretical analysis, numerical simulation, and measured data analysis to study the effect of the 3D resistivity method on detecting the effect of grouting on the floor of an ultrawide working face in the mine. The research results indicated that compared with the 2D observation mode of same-side power supply and reception, the 3D observation mode of opposite-side power supply and reception using the tunnels on both sides of the working face was more sensitive to the response of the water-rich area 60 m below the coal seam’s floor. Regarding the model’s set-up in this article, when traditional apparent resistivity calculations were used, the apparent resistivity obtained by the 3D observation mode was opposite to the model’s setting, and accurate electrical information of anomalous bodies must be obtained through 3D inversion. The measured data showed that although the ground grouting treatment effectively reduced the water volume in the floor, the treatment’s result was affected by human factors, and the water in the floor was redistributed.

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Preliminary study on wave field and dispersion characteristics of channel waves in VTI coal seam media

Cited by 8 publications

References 23 publications

Quantitative Evaluation of Faults by Combined Channel Wave Seismic Transmission-Reflection Detection Method

Quantitative Evaluation of Faults by Combined Channel Wave Seismic Transmission-Reflection Detection Method

Study on In-seam Wave Response Characteristics of Reflection in Fault Bearing Coal Seam of Shuangliu Coal Mine

Research and Application of the Mine 3D DC Resistivity Method for Detecting Grouting in the Floor of an Ultrawide Working Face, Taking the Yongmei Xinqiao Coal Mine in Henan Province as an Example

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