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Analysis of coal beds structure by the method of acoustic geolocation

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Category: Geotechnical and mining mechanical engineering, machine building

Last Updated on 24 July 2014

Published on 10 July 2013

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Authors:

A.N. Shashenko, Dr. Sci. (Tech.), Professor, State Higher Educational Institution “National Mining University”, Head of the Department of Construction and Geomechanics, Vice-Rector for International Relations, Dnepropetrovsk, Ukraine

V.N. Zhuravlev, Cand. Sci. (Tech.), Senior Research Fellow, State Higher Educational Institution “National Mining University”, Senior Research Fellow of the Department of Construction and Geomechanics, Dnepropetrovsk, Ukraine

Ye.V. Maslennikov, Cand. Sci. (Tech.), Senior Research Fellow, State Higher Educational Institution “National Mining University”, Senior Research Fellow of the Department of Construction and Geomechanics, Dnepropetrovsk, Ukraine

M.S. Dubitskaya, State Higher Educational Institution “National Mining University”, postgraduate student, Dnepropetrovsk, Ukraine

Abstract:

Purpose. To develop the measures for the effective mining of coal beds and improvement of work productivity in dangerous outburst-prone mines where hidden disjunctive geological faults appear.

Methodology. The use of acoustic waves as a carrier of information about tension and structural organization of the rock mass is the most promising way of study of objects by means of non-destructive testing. It is caused by the fact that the kinetic energy of the probe signal transmitted in the acoustic waveguide interacts with internal potential energy of the medium. Depending on the internal energy of the waveguide the modulation parameters index of the acoustic signal changes, the process allows to analyze the stress condition parameters and faults in the rock massif.

Findings. We have obtained positive results of application of the method and equipment for predicting the areas of abnormal stress concentrations during the mining in the areas of geological faults, to set  the automatic control of the operation of tunneling machines and cutter-loaders. Reliability of the acoustic control method and equipment, its efficiency, versatility and compatibility with other technical means makes it possible to consider it as the basis for the development of automated systems of geomechanical monitoring in underground mining, provided the theoretical justification of basic parameters of acoustic oscillations in complex structural rock massif.

Originality. We have proved the presence of the information phase modulation of low-frequency envelope of the power spectral density of the probe acoustic signal. For the first time we have proposed to use the method of phase demodulation of power spectral density function for acoustic control and forecasting of abnormal zones of stress concentrations during mining the areas of geological faults.

Practical value. The developed method of research has confirmed its operability in order to provide tomography of untouched massif in the mine “Dneprovskaya”. The measurements allowed detecting the configuration of geological faults and characteristics of the strength properties of the massif within the faults and beyond them. We have designed and produced the special sensor for measurement in the mine “Dneprovskaya”.

References:

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Shashenko, A.N., Zhuravlev, V.N. and Dubitskaya, M.S. (2013), “Mathematical Model of the Envelope of Vibroacoustic Sounding of Heterogeneous Rock Massif”, Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no.1, pp. 57–61.

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Shashenko, A.N., Zhuravlev, V.N. and Dubitskaya, M.S. (2013), “Analysis of Mathematical Model of Modulation of Full Phase Envelope of Vibroacoustic Sounding Signal in the Problem of Geolocation of Dispersion Properties of Heterogeneous Rock Mass”, Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no.2, pp. 68–73.

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Zhuravlev, V.N., Maslennykov, Ye.V. and Kondratyuk, Ye.V. (2010), “Properties of stationary of probing coal seam vibroacoustic data signal”, Collection of Scientific Papers of NMU, no.34, T. 1, pp. 192–199.

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