Near-field vibration induced by single-hole blasting under different initiation modes

Abstract

In drilling and blasting, initiation modes determine the propagation direction of detonation wave, which affects the distribution of blast vibration field. In this study, the near-field distribution characteristics of peak particle velocity (PPV) induced by different initiation modes were obtained based on the solution model of the Heelan equivalent elements. The influence law of the initiation mode on the transmission of explosion energy was determined. Through onsite single-hole blasting experiments, the PPV resulting from different initiation modes, such as top initiation, bottom initiation, midpoint initiation, and two-point initiation, were compared and analyzed. The influence of the initiation mode on the transmission of explosion energy was also discussed. The results revealed that the PPV are positively proportional to the blasting load amplitude and the charge length, but inversely proportional to the duration and rising time of the blasting load. The PPV induced by the different initiation modes has the following relationship: bottom initiation > midpoint initiation > two-point initiation > top initiation. The effect of initiation mode on PPV gradually decreased with increasing distance from the blasting centre.

Keywords:

• Action mechanism
• blast vibration
• initiation modes
• midpoint initiation
• top initiation

Data availability statement

The data used to support the findings of this study are available from the corresponding author upon request.

Additional information

Funding

This work is supported by the National Natural Science Foundation of China (51979152, 52209162), Educational Commission of Hubei Province of China (T2020005), Open Foundation of Hubei Key Laboratory of Construction and Management in Hydropower Engineering (2020KSD03), and Educational Commission of Jiangsu Province of China (21KJB580001). The authors would like to thank all the supporters.