Directional Attenuation Relationship for Ground Vibrations Induced by Mine Tremors
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ROCK FAILURE
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Directional Attenuation Relationship for Ground Vibrations Induced by Mine Tremors P. Bańkaa*, E. Lierb**, M. M. Fernándezc***, A. Chmielad*****, Z. F. Muñize******, and A. B. Sanchezc**** a
Silesian University of Technology, Gliwice, 44-100 Poland *e-mail: [email protected] b FAMUR S.A., Katowice, 40-698 Poland **e-mail: [email protected] c University of Leon, Campus de Vegazana, 24071 Spain ***e-mail: [email protected] ****e-mail: [email protected] d Spółka Restrukturyzacji Kopalń, Bytom, Poland *****e-mail: [email protected] e University of Oviedo, Campus de Llamaquique, 33005 Spain ******e-mail: [email protected] Received September 12, 2019 Revised September 14, 2019 Accepted April 10, 2020 Abstract—The paper presents the discussion on problems involving the reproduction of the acceleration field of ground vibrations based on the pointwise registration carried out in coal mines subjected to seismic hazard. Simple model that takes into account directional effects of seismic wave attenuation has been presented. It has been accepted the assumption that the contours of the peak ground accelerations take the shape of an ellipse. The carried out calculations for three cases of very strong ground vibrations caused by mine tremors which occurred in three regions of coal mines, show that the application of the proposed model allows us to reduce the value of standard error of the estimate as compared to the results obtained with the commonly applied regression model, which does not allow for the directional effects of attenuation. For the investigated regions, it was showed, that the directional effects of the attenuation depends on the directions of the nearest big tectonic faults. Keywords: Induced seismicity, ground vibrations propagation, directional attenuation relationship. DOI: 10.1134/S1062739120026698
INTRODUCTION
Hard coal and copper-ore exploitation conducted in many mines is assisted by high-energy rock mass tremors. Those phenomena sporadically generate rock bursts in mine excavations, but more often they cause highly perceptible ground vibrations. Those vibrations repeatedly cause anxiety of inhabitants, but they might also be a reason for an early appearance of damages in non-structural elements of buildings or even structural elements in extreme cases. The intensity of ground vibrations caused by mining tremors depends on many diverse factors, e.g.: seismic energy of a tremor, the depth of the focus and the epicentral distance of an observation point, the source mechanism and the center geological structure, especially local ground conditions at the point of observation—the type and thickness of loose overburden, its
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