In-Situ Measurements on Shock Wave Attenuation Rules Generated by Discontinuity Structures in Coal and Rock Medium

Hongwei Lian, Peng Li, Zhenwu Li, Jianhua Wang, Caiping Lu

Abstract


The effective weakening and controlling of mining-induced shock wave intensity is a key issue to prevent the coal and rock dynamic disasters such as rockburst and mining tremors, etc. By field measurements, the attenuation rules of shock waves generated by blast were analyzed in the coal mines with strong rockburst danger. We obtained main conclusions are as: (1) The vertical attenuation coefficient of transverse propagation is much larger than bed-parallel horizontal attenuation coefficient.(2)For the same propagation distances, there may be a significant difference of 15 times between horizontal and vertical energy attenuation coefficients; (3) along with the propagation of shock wave, the high-frequency components gradually attenuate, and the frequency spectrums move to low-frequency band.

Keywords


Shock Wave; Discontinuity Structure; Attenuation Effect; Frequency-Spectrum Evolution; In-Situ Measurements

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References


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DOI: https://doi.org/10.18686/pes.v3i4.1438

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