巷道超前探测中的地震波场特征与断层识别

运用Tesseral正演模拟软件分别对巷道探测前方的60°断层与楔状体(区别为有无填充物)进行正演模拟,对比分析巷道前方断层和楔状体的地震反射波波场特征。结果表明,地震记录道中含有断层异常体信息时,信号的高频成分衰减较快,主频明显向低频移动。断层造成的绕射、反射及多次反射构成了对信号的低通滤波,以此作为前方是否有异常体的识别依据。在包含断层异常体的地震记录中,地震波的频谱与功率谱具有一致性,符合高频衰减快的特性,但是功率谱对异常体的识别精度更高。

Wave Characteristics and Identification of Fault in Tunnel Seismic Advanced Detection

In this paper,Tesseral is used to simulate the forward of 60 degree fault and sphenoid of the roadway de-tection. Through forward simulation,we can analyze the seismic reflection characteristics, its propagation law and the effect of fault or sphenoid on the reflection wave field of the fault in the front of the tunnel. Through the analy-sis,it draws a conclusion that the high frequency components of the signal attenuate faster than the abnormal one, when the seismic record contains the information of the fault body. Due to the diffraction,and multiple reflection of the fault,main frequency is moved to low frequency. In seismic records containing fault anomalies,the spectrum of seismic waves is consistent with the power spectrum, conforming to the characteristics of high frequency attenua-tion. While,the power spectrum is more accurate for the recognition of abnormal bodies.