节理刚度对地震勘探激发效果的影响研究

摘要

In this paper,the discrete element program UDEC was used to simulate the propagation rule of seismic waves in a joi.nted rock mass.The feature of energy distribution in seismic signals is analyzed by means of the wavelet packet method,the results show that the joint stiffness has great influence on the vibrational energy,frequencies of the transmission and reflection waves.The lower the joint stiffness is,the higher the percentage of the vibrational energy of the reflection waves and the effective signal is,and the higher Signal to Noise Ratio(SNR) is,the better effect of excitation is.%采用离散元程序UDEC模拟了地震波在含节理岩体中的传播规律,并采用小波包分析技术对地震信号的频带能量分布特征进行分析,结果表明节理刚度对反射波和透射波的振动能量和频率均有较大影响,节理刚度越低,反射波振动能量和有效信号能量所占频带总能百分比越高,信噪比越高,则激发效果越好.