Analysis of Control Blast-induced Vibration & Practice
Analyzed characteristic of ware with blast-induced vibration of blast hole, the method to optimistically control blast-induced vibration at a predetermined location in same geological area of blast holes has been raised. The delayed blasting scheme is optimum, which detonation time of double blast holes in same group is delayed with half period from each other by short delayed ignition and longer delayed ignition between the groups should be reasonable to prevent effect on reducing reliably seism from circumstantial variety of wave. The averaged blasting wave of blast holes is extracted by calculating method Repeatedly Subtract Front from Behind and by discriminating with wave optimum collecting together. According to the method the actual delay interval, the equal wave of single blast hole, its wave of different frequency and the wave of different amplitude between double blast holes can be calculated by measuring wave of many blast holes, in order to prepare necessary premise to control blast-induced vibration and to divide different area of wave of single blast hole. Shown by industrial test and work a mine, in area to reduce seism easy, by blast hole in which blasting wave has waning characteristic with front vibration phase and approximate frequency, and in area able to reduce seism, where blasting wave has waning characteristic with front vibration phase and second-peak of approximate frequency, the method of controlling blast-induced vibration introduced by this paper will be adopted to reduce seism of many blast holes lower than single. If amplitude ratio kt of single blast hole wave varies between 1～0.6, in the area to reduce seism easy and able to reduce it the effect of seism reduced by disturbance will not be changed. If frequency ratio kf at main seismic phase between two waves disturbed varies within 1～0.9, in the area the effect of reducing seism still remains and its vibration is lower than single.
millisecond blasting control blast-induced vibration eztract wave of single blast hole calculating method Repeatedly Subtract Front from Behind
WEI Xiaolin ZHENG Bingxu
Guangdong Hongda Blasting Engr.Co., Ltd.Guangzhou, China
国际会议
The Second Asian-Pacific Symposium on Blasting Techniques(第二届亚太地区爆破技术研讨会)
大连
英文
506-512
2009-07-01（万方平台首次上网日期，不代表论文的发表时间）