立井冻结基岩段爆破振动信号时频分析  

Time-Frequency Analysis of Blasting Vibration in Freezing Bedrock Section of Shaft

作　　者：马芹永[1] 袁璞[1] 张经双[1] 韩博 

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]煤矿深井建设技术国家工程实验室,北京100013

出　　处：《建井技术》2015年第4期34-39,共6页Mine Construction Technology

摘　　要：为保证立井冻结基岩段井壁稳定和冻结管安全,布置爆破振动测点,监测冻结井筒掘进爆破过程中的振动效应;采用萨道夫斯基公式,对爆破振动速度进行回归分析。针对爆破振动信号短时非平稳的特点,采用HHT法对3个方向爆破振动信号进行时频特性分析。结果表明,爆破振动信号优势能量主要分布在主振频率所在的IMF分量内;井筒爆破3个方向振动信号在频域内分布不均匀,集中在0~147Hz范围内;能量谱的多个峰值分别对应于爆破振动信号的多个主频,表征了爆破振动信号的多频作用特性。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 vibration measuring points.Then Sadaovsk formula is adopted to conduct regression analysis for blasting vibration velocity.According to the characteristics of blasting vibration signal,short-duration and nonstationary,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 IMFs where main frequencies locate.Blasting vibration signals in three directions are distributed unevenly in frequency domain,mainly concentrated in frequency range of 0to 147 Hz.The multiple peaks in Hilbert energy spectrum correspond to multiple dominant frequencies of blasting vibration signals,which represents its multi-frequency interaction.

关 键 词：立井 冻结基岩段 爆破振动 时频特性 HHT 

分 类 号：TD265.34[矿业工程—矿井建设]