Geomechanics and Engineering

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Blasting wave pattern recognition based on Hilbert-Huang transform

  • Li, Xuelong (Key Laboratory of Gas and Fire Control for Coal Mines, School of Safety Engineering, China University of Mining and Technology) ;
  • Wang, Enyuan (Key Laboratory of Gas and Fire Control for Coal Mines, School of Safety Engineering, China University of Mining and Technology) ;
  • Li, Zhonghui (Key Laboratory of Gas and Fire Control for Coal Mines, School of Safety Engineering, China University of Mining and Technology) ;
  • Bie, Xiaofei (Qianqiu Coal Mine, Yima Coal Mining Group Co. Ltd.) ;
  • Chen, Liang (Key Laboratory of Gas and Fire Control for Coal Mines, School of Safety Engineering, China University of Mining and Technology) ;
  • Feng, Junjun (Key Laboratory of Gas and Fire Control for Coal Mines, School of Safety Engineering, China University of Mining and Technology) ;
  • Li, Nan (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology)
  • Received : 2015.12.14
  • Accepted : 2016.06.06
  • Published : 2016.11.25
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Abstract

Rockburst is becoming more serious in Chinese coal mine. One of the effective methods to control rockburst is blasting. In the paper, we monitored and analyzed the blasting waves at different blast center distances by the Hilbert-Huang transform (HHT) in a coal mine. Results show that with the increase of blast center distance, the main frequency and amplitude of blasting waves show the decreasing trend. The attenuation of blasting waves is slower in the near blast field (10-75 m), compared with the far blast field (75-230 m). Besides, the frequency superposition phenomenon aggravates in the far field. A majority of the blasting waves energy at different blast center distances is concentrated around the IMF components 1-3. The instantaneous energy peak shows attenuation trend with the blast center distance increase, there are two obvious energy peaks in the near blast field (10-75 m), the energy spectrum appears "fat", and the total energy is greater. By contrast, there is only an energy peak in the far blast field, the energy spectrum is "thin", and the total energy is lesser. The HHT three dimensional spectrum shows that the wave energy accumulates in the time and frequency with the increasing of blast center distance.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, China University of Mining and Technology, Central Universities, Natural Science Foundation of Jiangsu Province

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