摘要
采用离散元程序UDEC建立了含一条节理岩体的数值计算模型,并借助小波包分析技术研究了地震信号的频带能量分布特征和信噪比.分析表明,经小波包分析技术处理后的振动信号的不同频带能量可以得到很好地表达,并将振动信号分为低频干扰信号（0 ～ 20 Hz）、有效信号（20～ 80 Hz）和高频噪声信号（大于80 Hz）.同时,探讨了直达波和反射波各频带能量所占总能量的百分比与爆源距离的关系.
The numerical model of rock mass with one joint was established by using discrete element method,and the energy distribution of frequency band and signal-to-noise ratio of seismic signal were studied by using wavelet packet analysis.The comparative analysis showed that the different frequency band energy of seismic signal after treatment with wavelet packet analysis was well expressed,and the vibration signals were divided into low-frequency interference signal（0 ～ 20 Hz）,effective signal（20 ～ 80 Hz） and high frequency noise signal（greater than 80 Hz）.Meanwhile,the percent of each frequency band energy of direct wave and reflect wave occupied by total energy and relationship to the distance of explosion source were investigated.
出处
《爆破》
CSCD
北大核心
2013年第4期25-31,共7页
Blasting
基金
国家973计划项目(2010CB732001)
国家杰出青年基金(51025935)
关键词
小波包分析技术
UDEC
节理岩体
振动信号
频带能量
wavelet packet analysis
UDEC
jointed rock mass
vibration signal
frequency band energy
