Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (10): 2830-2844.doi: 10.16285/j.rsm.2021.5108

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Analysis of wave-type and seismic component induced by rock blasting considering source characteristics

GAO Qi-dong1, LU Wen-bo2, LENG Zhen-dong3, WANG Ya-qiong1, ZHOU Hai-xiao1, ZHANG Shi-chao1   

  1. 1. School of Highway, Chang’an University, Xi’an, Shaanxi 710064, China 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of the Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China 3. China Gezhouba Group Explosive Co., Ltd., Chongqing 401121, China
  • Online:2021-10-11 Published:2022-01-12
  • Contact: LENG Zhen-dong, male, born in 1989, PhD, Senior Engineer, mainly engaged in research on rock dynamics and engineering blasting, E-mail:
  • About author:GAO Qi-dong, male, born in 1991, PhD, Lecturer, mainly engaged in teaching and research in the field of engineering blasting and rock dynamics.
  • Supported by:
    the National Natural Science Foundation of China (52009003, 51809016), the Fundamental Research Funds for the Central Universities (300102210123) and the Open Research Funds of Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering Ministry of Education (EMHSE1903).

Abstract: The blasting induced seismic waves are generally composed of compressional wave (P-wave), shear wave (S-wave), and Rayleigh wave (R-wave), however, wave-type and seismic components are not differentiated in the attenuation law and safety criteria for the current blast vibration studies. In this study, a method of wave-type discrimination is used for the seismic wave prediction based on polarization direction. Using theoretical analysis and numerical modelling, the blasting source characteristics and the radiated wave-types are investigated for different shapes of explosive charge. Combined the results of the site blasting experiments, the wave-type and seismic components induced by three typical blast-holes are analyzed and three blast holes include the single vertical blast-hole, the smooth blast-hole, and the slope pre-splitting blast-hole. The source characteristics and acting mechanism are then discussed for different blast-holes. The dominant wave-type at special location is predicted for three blast types. The research results indicate that the blasting source of the vertical blast-hole can be viewed as a delay superposition of the short explosive column. All the P-, S-, and R-waves contribute to the ground surface vibration from the vertical blast-hole. With the increase of the blasting-target distance, it is found that the S-wave gradually deviates from its dominant radiation direction, while the P-wave mainly contributes to the horizontal radial vibration, and the R-wave dominates the vertical vibration. Because the horizontal smooth blast-hole and the slope pre-splitting blast-hole are both contour blast-holes, the two blast holes have a similar acting mechanism, in which the main acting force is the loading from the normal surface. The S- and R-waves are the dominant seismic wave types within the blasting contour surface, whereas the role of the P-wave is negligible. Besides, the R-wave becomes the dominant wave-type as the blasting center distance increases; however, the contribution of P-wave outside the contour surface cannot be ignored.

Key words: rock blasting, blasting-induced seismic wave, source characteristics, wave-type and seismic components, dominant wave-type