TY  - JOUR
ID  - epos2340
UR  - https://doi.org/10.1155/2021/9023550
A1  - Lurka, Adam
A1  - Mutke, Grzegorz
A1  - Ma?kowski, Piotr
A1  - Carbonari, Sandro
Y1  - 2021///
N2  - Peak particle velocity parameter is very useful in assessing underground mine working stability. Its application is widespread and
requires additional analysis of the dominant frequency of the seismic signal. In order to properly analyze the velocity amplitudes of
strong ground motions generated from seismic sources, time-frequency properties of near-source seismic signals in underground
mines should be quantified. Using numerical calculations, the continuous wavelet transform (CWT) of the recorded near-source
seismic signals in three perpendicular directions was obtained to characterize its time-frequency properties. &e properties of
recorded strong ground motion velocity seismograms for two high energy seismic events and two blasts from two underground
coal mines in Poland have been extracted with the use of continuous wavelet transform spectrograms showing the duration time of
each frequency group. Assuming a constant peak particle velocity amplitude on the analyzed seismograms, the duration time of
each frequency group starts to play a key role. &e longer the duration time of the lower frequency group is on the CWT
spectrogram, the more the damaging effect on underground mining excavations can be observed. Varying bandwidths of
dominant frequencies in separate time intervals for the analyzed seismic signals have had significantly different influence on the
potentially damaging effect on underground mining excavations.
JF  - Shock and Vibration
VL  - 2021
SN  - 1070-9622
TI  - Dynamic Influence of Near-Source Seismic Ground Motion on Underground Mine Working Stability Using Time-Frequency Analysis
SP  - 1
AV  - none
EP  - 16
ER  -