IMPACT ASSESSMENT OF EPICENTRE DISTANCES AND ENERGIES OF MINING SHOCKS ON THE TRANSMISSION OF FREE-FIELD VIBRATIONS TO THE BUILDING FOUNDATIONS

Abstract eng:
The study analyses the results of measurements of mining related surface vibrations in the Legnica-Glogow Copper Region (LGCR) to assess the impact of mining tremor epicentral distances as well as mining tremors energies on a curve relationship (ratio) of response spectra (RRS) from simultaneously measured free-field vibrations and building foundations vibrations. The sources of considered vibrations were mine-induced rockbursts resulting from underground exploitation of copper ore. Only records induced by rockbursts with energy higher than 106 J and horizontal components of peak ground accelerations larger than 10cm/s2 are analysed. Epicentral distances of considered mining shocks are in the range re = 270 – 5839 m and energies are in the range En = 1∙106 – 2∙109 J. Dimensionless acceleration response spectra (β) as well as dimensional acceleration response spectra (Sa) from the horizontal vibrations were taken into account. The focus is on residential buildings – mediumrise building and high-rise building. The results of analyses show that the epicentral distance of mining shock can have a significant impact on the transmission of response spectra from the free-field to the residential building foundations (medium-rise building and high-rise building). This effect is more visible in the case of curves RRS(β) determined using dimensionless acceleration response spectra β than curves RRS(Sa) calculated for corresponding pairs for dimensional spectra Sa. The appropriate conclusions regarding the influence of mining tremors energies also have been achieved.

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