Abstract
Long-hole blasting in mines is likely to cause strong vibration of surficial infrastructure, greatly damage the rock mass surrounding goaf near explosion center, and possibly induce blast vibration disasters. In this article, an improved method for multihole blasting seismic wave prediction is proposed to estimate far-field blast vibration. In this method, the fundamental vibration waveforms are firstly measured through the field blast with a single deck at an underground pilot area. The fundamental vibration waveforms are then used to simulate the vibration waveforms for a single-deck case in the production blast by considering the difference of the equivalent distances from the production blast site and the pilot area to the surface measuring point. The vibration waveforms for the single-deck case are linearly superposed to predict the possible vibration waveforms in production blast with multiple long holes and decks according to the designed delay time between decks. Based on these predicted waveforms, the blast vibration can be estimated and the blast design can be optimized to determine a rational delay time in accordance with the vibration limit. The proposed method was applied in pillar recovery of Hongling Polymetallic Mine to optimize the long-hole blast design to manage blast vibration. The rational delay time for the 716 production blast design was recommended as 26 ms. The practice showed that the blast vibration induced by the 716 production blast has been managed, and the predicted and the measured waveforms agree well. It provides an effective method for multihole blast design to control blast vibration.
Highlights
Long-hole blasting has many advantages for mining engineering, such as a large blasting scale, a large volume of caved ore, and lower specific charge
The blast vibration waveforms of monitoring point #3 with the 3,084 ms duration were selected as the fundamental vibration waveforms because the monitoring point P3 is close to the main building in the mine area
The predicted value is basically consistent with the measured value, and the predicted blast vibration waveforms are similar to the measured blast vibration waveforms (Figure 7)
Summary
Long-hole blasting has many advantages for mining engineering, such as a large blasting scale, a large volume of caved ore, and lower specific charge. A method for multihole blasting seismic wave prediction was proposed to determine a rational delay time for multihole blasting, which is based on the fundamental vibration waveforms from a single-deck blast test.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
