Resumo

HU, X.  e  QU, S.. A new approach for predicting bench blasting-induced ground vibrations: A case study. J. S. Afr. Inst. Min. Metall. [online]. 2018, vol.118, n.5, pp.531-538. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2018/v118n5a9.

The paper describes efforts to find an effective and reasonable method for predicting ground vibrations induced by bench blasting. In order to reflect the effect of actual topography and geological conditions, two concepts - the equivalent path and equivalent distance - are introduced to take into account the effects of topographic features and properties of the rock and rock mass. An equivalent-path-based equation, the EPB equation, is thus proposed, which takes into account the impacts of maximum charge quantity and explosion heat of the explosive, acoustic impedance of the rock, integrity coefficient of the rock mass, as well as the equivalent distance. A total of 48 field seismic monitoring tests were carried out and the constants of the EPB equation were determined. Comparison of the predicted peak particle velocity values with those measured shows that the average error of the prediction is much lower, demonstrating the applicability of the EPB equation in the prediction of bench blasting-induced ground vibrations.

Palavras-chave : bench blasting; ground vibration; peak particle velocity; prediction; equivalent path; equivalent distance.

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