Theoretical basis and application of vertical Z-component in-seam wave exploration

Wenxin, He; Ji, Guangzhong; Dong, Shouhua; Li, Gang

doi:10.1016/j.jappgeo.2017.01.008

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…With simple shape, short duration, and fast convergence, the Ricker wavelet is a suitable tool for numerical simulations [18]. In the time domain, the Ricker wavelet can be expressed as: 6) where, fm is the main frequency; t0 is the initial moment.…”

Section: Parameters and Source Termmentioning

confidence: 99%

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Propagation Features of Channel Wave Signal in Coal Seam with Scouring Zone

Sun¹,

Qi²,

Tian³

et al. 2021

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This paper mainly analyzes the typical geological structure of the coal seam with scouring zone, and examines the channel features of the coal seam. Firstly, a detailed analysis was conducted on the propagation features of channel wave in complex coal seam with geological anomalies. Based on COMSOL Multiphysics, a three-dimensional (3D) medium geometry model was established for complex coal seam with scouring zone. Relying on the model, channel wave propagation was simulated by finite-element method, and the propagation features were analyzed thoroughly. The Ricker wavelet with a central frequency of 200Hz was employed to emulate the explosive source, and the excited vibration signal was measured along the coal seam. Experimental results show that the longer the propagation distance of the channel wave signal in the coal seam, the more stretched the channel wave train, and the later the arrival of the maximum envelope of the wave train. The maximum envelope of the wave train appeared earlier in the model with the scouring zone than in the model without the scouring zone. After the channel wave passed through the scouring zone, the maximum envelope of the wave train appeared later in the model with the scouring zone than in the model without the scouring zone.

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Section: Parameters and Source Termmentioning

confidence: 99%

“…However, few have tackled the influence of small structures, e.g., scouring zone, on the propagation features of the wave [4]. The propagation features of elastic waves are usually analyzed by the elastic wave equation and geological methods [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Propagation Features of Channel Wave Signal in Coal Seam with Scouring Zone

Sun¹,

Qi²,

Tian³

et al. 2021

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“…The measurement of observed group velocity is generally performed through multiple filtering and time-frequency analysis (Bhattacharya, 1983;Cox & Mason, 1988). The guided or seam waves generate very strong Airy phase, which is marked by a minimum or maximum of group velocity in a dispersion curve (Czarny et al, 2021) and is most suited to ISS experiment (He et al, 2017;Ji et al, 2019). The Airy phase has large amplitude because it is a stationary phase that accumulates energy from nearby frequencies (Ewing et al, 1957;Krebes, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Guided waves propagate in coal seam where such waves are also called channel or seam waves (Evison, 1955). P‐ and S‐wave velocities in coal seam are nearly half of those in the host rock; thus, coal seam acts as a wave guide with modes excited strongly by sources placed within the seam through in‐seam seismic survey (ISS) experiments (Yancey et al., 2007; Schott & Waclawik, 2015; He et al., 2017; Zhu et al., 2019). Guided or channel waves are dispersive as in surface waves or interface waves.…”

Section: Introductionmentioning

confidence: 99%

Dispersion computation of guided waves in a layered transversely isotropic elastic medium sandwiched between two half‐spaces

Bhattacharya

2023

Geophysical Prospecting

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A transversely isotropic (TI) elastic medium with vertical axis of symmetry (VTI) is considered. We obtain dispersion equations in real terms for guided Love and Rayleigh waves in a VTI medium consisting of horizontal layers sandwiched between two half‐spaces by brief modifications of the available literatures on dispersion equations in elastic layered media through transfer matrix. To illustrate the applicability, dispersion curves of guided waves are computed for 3‐layered and 5‐layered symmetric models with a VTI coal seam in the middle. Airy phase is marked by a minimum or maximum of group velocity in a dispersion curve and this phase is important to get seam structure for mining safety. For the first 3 modes, the effect of VTI Thomsen parameters γ, ε and δ of a coal seam on frequency (fA) and group velocity (UA) of Airy phase is similar in 3‐ and 5‐layered models. For guided Love waves, fA and UA have nearly an uniform increase with increase of γ. For guided Rayleigh waves, increase of ε causes fA and UA to increase; while increase of δ causes fA and UA to decrease.This article is protected by copyright. All rights reserved

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“…In the prevention and control of mine water disaster, the way of drilling combined with geophysical exploration is often used to advance water exploration and release. The geophysical exploration methods include Seismic channel wave exploration [1], resistivity method, transient electromagnetic method and audio frequency electric method perspective. The No.8 coal seam currently being mined by four mines is affected by the top and bottom aquifers during mining.…”

Section: Introductionmentioning

confidence: 99%

Application of Seismic Channel Wave Technology on Small Structure Exploration in Coal Mine

Fan,

Chen,

Wang

et al. 2023

IJE

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At lane 20207 and lane 50207 of the 80207 working face of Sitai Mine, many small faults are exposed, and their extension is unknown, which causes great interference to safe and efficient mining and even normal production of the working face. In order to guide the rational transformation and safe and efficient production of the working face with science, Sitai Coal Mine commissioned Henan Polytechnic University to find out the extension of the exposed fault on the face and other geological anomalies by using geophysical exploration methods. According to the purpose of geophysical exploration in Sitai coal mine, combined with the geological conditions of the working face, the SUMMIT II EX type seismic channel wave exploration produced by DMT company of Germany is selected to explore the 80207 working face with the combined detection method of transmission and reflection. According to the detection results, combined with the existing hydrogeological data of Sitai mine, the relative channel wave anomaly area is delineated. The results show that the seismic channel wave exploration can provide a basis for the prevention and control of mine water disaster conveniently and effectively.

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Theoretical basis and application of vertical Z-component in-seam wave exploration

Cited by 9 publications

References 12 publications

Propagation Features of Channel Wave Signal in Coal Seam with Scouring Zone

Propagation Features of Channel Wave Signal in Coal Seam with Scouring Zone

Dispersion computation of guided waves in a layered transversely isotropic elastic medium sandwiched between two half‐spaces

Application of Seismic Channel Wave Technology on Small Structure Exploration in Coal Mine

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