Time-Frequency Analysis of Blasting Vibration in Freezing Bedrock Section of Shaft
MA Qin-yong
YUAN Pu
ZHANG Jing-shuang
HAN Bo
Abstract：To ensure the stability of shaft lining and safety of freezing pipe in freezing bedrock section , blasting vibration effect during freezing shaft excavation have been monitored by installing blasting vi‐bration measuring points. T hen Sadaovsk formula is adopted to conduct regression analysis for blasting vibration velocity. According to the characteristics of blasting vibration signal ,short-duration and non-stationary ,HHT methods is selected to carry out time-frequency analysis of blasting vibration signals in three directions. Results show that most of blasting energy is distributed in IM Fs w here main fre‐quencies locate.Blasting vibration signals in three directions are distributed unevenly in frequency do‐main ,mainly concentrated in frequency range of 0 to 147 Hz. The multiple peaks in Hilbert energy spectrum correspond to multiple dominant frequencies of blasting vibration signals ,which represents its multi-frequency interaction.
Keywords：shaftfreezing basement rock sectionblasting vibrationtime-frequency characteristicsHHT
Publication Date：2015-05-17
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 34-39 )