摘要
利用HHT分析法对岩墙浅孔爆破开挖时在既有铁路接触网铁塔基础处产生的爆破振动进行处理和分析,得到原始振动信号的时频谱、边际谱和瞬时能量。结果显示:HHT分析法对非平稳、随机复杂的爆破振动波的分解具有高效性和准确性;爆破振动波由不同的波形组成且频率丰富,其中主要组成部分属于低频,对建(构)筑物破坏影响较大;从能量方面分析了爆破振动波对接触网铁塔的影响,瞬时能量曲线展示了爆破时传播到测点处每个时刻的能量大小,为评价爆源对测点爆破振动影响提供了新思路。
This paper deals with and analyzes the blasting vibration of rock wall blasting at the existing railway catenary tower by HHT analysis method.The time spectrum,marginal spectrum and instantaneous energy of the original signal are obtained.The results show that HHT analysis method is efficient for the decomposition of non-stationary,random and complex blasting vibration wave;the main part of blasting vibration wave is composed of different wave forms consisting of the low frequency part,which has great influence on the damage of buildings;in terms of energy,the instantaneous energy curve shows the energy transmitted from the whole blasting process to the measuring point.The influence of blasting vibration wave on the catenary tower is analyzed,which provides a new way to evaluate the impact of blasting source on blasting vibration of measuring point.
作者
李建军
LI Jianjun(China Railway 12^(th) Bureau Group Co.Ltd.,Taiyuan Shanxi 030024,China)
出处
《铁道建筑技术》
2021年第4期18-22,共5页
Railway Construction Technology
基金
中铁十二局集团有限公司科技研发项目(公司技[2018]9号-61号)。
关键词
露天爆破
HHT
既有铁路
时频特征
surface blasting
HHT
existing railway
time-frequency characteristic
