Науковий вісник НГУ

Forecast of disjunctives based on mathematical interpretation of acoustic signal phase characteristics

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Category: Geotechnical and mining mechanical engineering, machine building

Last Updated on 27 October 2015

Published on 27 October 2015

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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, Dnipropetrovsk, Ukraine.

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

Ye.A. Sdvizhkova, Dr. Sci. (Tech.), Professor, State Higher Educational Institution “National Mining University”, Head of the Higher Mathematics Department, Dnipropetrovsk, Ukraine.

M.S. Dubitska, Cand. Sci. (Tech.), State Higher Educational Institution “National Mining University”, Assistant Lecturer of the Higher Mathematics Department, Dnipropetrovsk, Ukraine.

Abstract:

Purpose. To increase the efficiency and reliability of a nondestructive technique to forecast hidden disjunctives in a flat-lying coal seam mined with plow longwall technology.

Methodology. To meet the goal an integrated approach was involved. It was based on the visual and instrumental observations in situ; analytical and numerical methods of tectonic map creation; analysis and interpretation of the results obtained by acoustic sounding.

Findings. The new technique was developed to process the acoustic signal exploring the heterogeneous rock mass. It distinguishes from the known techniques by being based on a phase demodulation of spectral power density using the method of low-frequency equivalent. This allows predicting the small amplitude tectonics of coal seams and rocks. The location of irregularities can be determined while driving an excavation over a zone of geological faults.

Originality. For the first time the relationship between the information component of acoustic signal modulation and hidden geological fault location were determined. The acoustic signals generated artificially have been used to explore the untouched part of the coal seam mined with plow technology under West Donbass geological conditions.

Practical value. The reliability of the hidden disjunctives forecast and rock mass tomography study in the “Stepova” mine owned by PAT “DTEK Pavlohradvuhillia” has been improved. 

References:

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