Study on wedge cutting segmented delayed blasting technology

In conventional drilling and blasting construction, simultaneous initiation of cutting holes generates significant vibrations. These vibrations can adversely affect the stability of surrounding rock and nearby structures. To address the issue of excessive blasting vibrations, this paper proposes the wedge cutting segmented delayed blasting technology. Firstly, by optimizing the initiation method for cutting holes and leveraging the precise delay characteristics of electronic detonators, a classified and optimized sequence for initiating cutting holes is proposed. This involves the earlier initiation of first-blast holes followed by the delayed initiation of post-blast holes, with the former providing a new free face for the latter. Then, a cavity model for the first-blast holes is established. Through mechanical analysis of the rock-breaking process in the cutting cavity, criteria for cavity formation through wedge cutting segmented blasting are formulated. Finally, based on Anderson’s superposition principle and different blasting vibration waveforms from various types of blast holes, an expression for precise delayed blasting vibration waveforms is developed. Field validation results demonstrate that the wedge cutting segmented delayed blasting technology can effectively reduce blasting vibrations. The findings provide guidance for vibration reduction in field blasting operations.