Application of Hilbert-Huang transform based delay time identification in optimization of short millisecond blasting
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- 作者：Xiu-zhi SHI ; Xian-yang QIU ; qiuxianyang_csu@163.com" class="auth_mail" title="E-mail the corresponding author ; Jian ZHOU ; Xin CHEN ; Yu-qian FAN ; Er-wei LU
- 关键词：delay time identification ; short millisecond blasting ; precise initiation ; vibration reduction ; Hilbert-Huang transform (HHT)
- 刊名：Transactions of Nonferrous Metals Society of China
- 出版年：2016
- 出版时间：July 2016
- 年：2016
- 卷：26
- 期：7
- 页码：1965-1974
- 全文大小：2836 K
文摘
The accurate identification of delay time in millisecond blasting plays an important role in the optimization of blasting design and reduction of vibration effect. Through a case study of a surge shaft blasting project, the capability of the EMD (empirical mode decomposition) method in identifying the delay time of short millisecond blasting with precise initiation was compared with the instantaneous energy method based on Hilbert-Huang transform (HHT). The recognition rate of the EMD method was more than 80%, while the instantaneous energy method was less than 25%. By analyzing the instantaneous energy of single-hole blasting signal, it was found that the instantaneous energy method was adaptable to millisecond blasting with delay time longer than half of the energy peak period. The EMD method was used to identify delay time of millisecond blasting in Zijinshan open-pit mine. According to the identification results, the blasting parameters were optimized for controlling the blast-induced vibration and reducing the large block ratio. The field data showed that the velocity peak of ground vibration was reduced by more than 30% under almost the same maximum charge per delay by the optimization of delay time and detonating detonators. Combining with slag-remaining blasting and burden optimization of the first row, the large block ratio was reduced to less than 3%. The research results proved that the identification method based on HHT was feasible to optimize the blasting design. The identification method is also of certain reference value for design optimization of other similar blasting projects.