Main Article Content

Abstract

One of the major problems associated with the excavation of the copper deposits in underground mines in Poland is the relatively high level of seismic activity. Numerous high-energy tremors can negatively affect the stability of underground workings and can have a destructive impact on the infrastructure located at the surface as well. As predicted, the seismic activity increases along with the depth of mining operations. Therefore, to face these threats, a number of organizational and technical prevention methods have been applied in the mines. One of them is the assessment of the effect of additional dynamic loads on the structures behaviour with the use of numerical modelling. Recently there have been some possibilities of conducting dynamic analyses, i.e. using the finite element method that allows gathering information on the changes in stress conditions or deformation levels within the analysed object. Unfortunately, these kinds of calculations are usually performed after the occurrence of an unwanted event, so it is rather a post factum method. This is mainly due to the lack of information about the worst scenario of seismic wave distribution. At the same time, during the preliminary risk assessment, in most cases, only the maximum predicted value of seismic wave amplitudes is taken into consideration. Other dynamic parameters such as dominant frequency and duration of seismic wave are usually omitted.


In this paper, the time-frequency characteristics of induced seismic waves observed within the Lower Silesian Copper Basin were analysed. Based on the high-energy seismic events database, dominant frequencies, amplitudes and tremor durations were determined. Then the correlation between each parameter, i.e. the energy of each tremor and their hypocentic distance from the seismic source and monitoring station were determined.

Keywords

induced seismicity dominant frequency dynamic load

Article Details

Author Biographies

Krzysztof Fuławka, M.Sc., Min.Eng., KGHM CUPRUM Ltd. Research and Development Centre

MSc., Min. Eng. Krzysztof Fuławka is a Research Assistant in Rock Engineering Department of KGHM CUPRUM R&D Centre and PhD-Student at Faculty of Geoengineering, Mining and Geology of Wroclaw University of Science and Technology. He focuses on slope stability assessment in dynamic load condition and risk management. He is a co-author of several research papers, reports and prefeasibility studies. His background is rock mechanics and numerical modelling as well as blasting technology and testing of explosives.

Lech Stolecki, PhD., Min.Eng., KGHM CUPRUM Ltd. Research and Development Centre

Dr Lech Stolecki is a researcher in KGHM Cuprum Research & Development Centre. He received his Master of Science at Wrocław University of Science and Technology in 2000. In 2006 he obtained his PhD in mining with specialization of geoengineering. His research interests cover rock mechanics, seismic activity in underground mines and protection of the land surface. He participated in dozens of research papers of the dynamic impact on the land surface caused by mining tremors and the stability of the underground mine excavation.

Izabela Jaśkiewicz-Proć, PhD., Min.Eng., KGHM CUPRUM Ltd. Research and Development Centre

Dr Izabela Jaśkiewicz-Proć has been working in KGHM CUPRUM Research & Development Centre since 2003. In this company, she deals with the impact of the seismic wave on the infrastructure and the issues concerning the protection of the mining areas. She actively takes part in research related to the seismic measurements in regions affected by underground mining. She has also great experience in the analysis of para-seismic wave propagation, determining the vibration damping function and forecasting dynamic impacts on the surface.  She has participated in various research projects supported by the Ministry of Higher Education and the European Space Agency.

Prof. Witold Pytel, KGHM CUPRUM Ltd. Research and Development Centre

Prof. Witold Pytel is one of the leading rock mechanic specialists in Poland with more than 25 years of experience in deep copper mining industry. At the moment He is a head of Rock Engineering Department and leader of the scientific board of KGHM CUPRUM R&D Centre.

Piotr Mertuszka, PhD., Min.Eng., KGHM CUPRUM Ltd. Research and Development Centre

Dr Piotr Mertuszka is an Assistant Manager of Rock Engineering Department of KGHM CUPRUM Research & Development Centre located in Wroclaw, Poland. He also works as a lecturer in the Mining Institute at the Wroclaw University of Science and Technology. He is an co-author of several research report, documentation, prefeasibility studies etc. His background is rock mechanics and numerical modelling as well as blasting technology and testing of explosives.

How to Cite
Fuławka, K., Stolecki, L., Jaśkiewicz-Proć, I., Pytel, W., & Mertuszka, P. (2020). THE ANALYSIS OF SEISMIC LOAD CHARACTRESITIC OBSERVED IN THE LOWER SILESIAN COPPER BASIN. SWS Journal of EARTH & PLANETARY SCIENCES, 2(2), 35-49. https://doi.org/10.35603/eps2020/issue2.03

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