Seasonal Blasting-Induced Seismic Impact on Guarded Objects
V. A. Kutuev, P. V. Men’shikov, A. S. Flyagin, S. N. Zharikov
Institute of Mining, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Keywords: Blasting, seismic impact, ground condition coefficient, seismic attenuation factor, Peak Particle Velocity, reduced distance, seismic safety, seasonal factor
Abstract
Blasting-induced seismic impact on guarded objects is discussed as a case-study of the Novosmolinsky deposit of granodiorites. Efficiency of seismic safety designs is validated, the actual ground conditions coefficients and ground-motion attenuations are determined with regard to seasonal variations. Based on the ground motion monitoring at guarded objects, the regressional relationships are found between the PPV values and the reduced distances, which enables prediction of levels of blast-induced impacts. The influence of seasonal fluctuations is determined: the ground condition coefficient and seismic attenuation factor increase under negative temperatures, which requires adjustment of mass of explosive charges and distances to guarded objects in the winter period. The formulas are proposed for the calculation of seismically safe parameters of blasting designs with regard to soil temperatures. The results prove the relationship proposed by Academician M. A. Sadovsky, and expand its application range with regard to seasonal factors. The obtained equations improve accuracy of the blasting-induced seismic impact prediction, which allows well-founded adjustment of blasting design parameters and risk minimization at guarded objects nearby.
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