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<p>This study presents an integrated experimental and empirical approach to understanding blast-wave propagation in opencast mine bench blasting, using seismic wave velocity measurements and formulae modelling. Empirical correlations were developed to predict particle displacement and velocity from known agitation pressures and validated using established equations. The study also calculated detonation-induced pressures (4.2&#xa0;GPa for ANFO explosive) through existing empirical relationships and used them as a source pressure at the actual blast event. The experimental phase utilised a Sonic-Viewer velocity meter on a laboratory scale to measure P-wave velocities in rock specimens collected from a limestone quarry. Specimens were prepared in varying lengths, tested under controlled conditions, and analysed for dynamic elastic properties. Results revealed a power-law decay in P-wave propagation pressure with specimen length aligning with wave attenuation principles, where pressure decreased from 12&#xa0;MPa at short lengths to below 2&#xa0;MPa at lengths exceeding 150&#xa0;mm. Additionally, there is a parabolic trend between angular frequency and particle velocity, with an initial increase, reaching a peak, and then a decline. A correlation coefficient (<i>R</i><sup><i>2</i></sup> = 0.47) was observed between angular frequency and particle velocity, indicating significant variability influenced by rock density, wave scattering, and explosive characteristics. This framework offers a dual benefit: experimental reproducibility in lab settings and applicability to field scenarios through seismograph-based measurements, supporting predictive modelling for safe and efficient blasting operations.</p>

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An Empirical Approach for Investigating the Blast-Wave Propagation in Opencast Mine Bench Blasts Using Seismic Experiment

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Rajeev Verma,
  • B. S. Choudhary

摘要

This study presents an integrated experimental and empirical approach to understanding blast-wave propagation in opencast mine bench blasting, using seismic wave velocity measurements and formulae modelling. Empirical correlations were developed to predict particle displacement and velocity from known agitation pressures and validated using established equations. The study also calculated detonation-induced pressures (4.2 GPa for ANFO explosive) through existing empirical relationships and used them as a source pressure at the actual blast event. The experimental phase utilised a Sonic-Viewer velocity meter on a laboratory scale to measure P-wave velocities in rock specimens collected from a limestone quarry. Specimens were prepared in varying lengths, tested under controlled conditions, and analysed for dynamic elastic properties. Results revealed a power-law decay in P-wave propagation pressure with specimen length aligning with wave attenuation principles, where pressure decreased from 12 MPa at short lengths to below 2 MPa at lengths exceeding 150 mm. Additionally, there is a parabolic trend between angular frequency and particle velocity, with an initial increase, reaching a peak, and then a decline. A correlation coefficient (R2 = 0.47) was observed between angular frequency and particle velocity, indicating significant variability influenced by rock density, wave scattering, and explosive characteristics. This framework offers a dual benefit: experimental reproducibility in lab settings and applicability to field scenarios through seismograph-based measurements, supporting predictive modelling for safe and efficient blasting operations.