摘要
利用二维声波有限差分方程正演得出了垂直介面地质体隧道超前预报模型的波场快照和单炮记录,通过对波场快照和单炮记录的分析,从理论上得出了负反射的基本特征以及负反射和界面位置的相对关系,然后通过对一组隧道超前预报实际数据的计算分析,证实了负反射确定界面位置的准确性,为超前预报利用原始资料分析提供了重要的参考。
In this paper,the wave field snapshots and single shot records of the advanced prediction model of tunnel with vertical interface are obtained by forward modeling of two-dimensional acoustic finite difference equation.Through the analysis of wave field snapshots and single shot records,the basic characteristics of negative reflection and the relative relationship between negative reflection and interface position are obtained theoretically.Then,by calculating and analyzing a group of actual data of tunnel advanced prediction,the accuracy of determining interface position by negative reflection is confirmed,which provides an important reference for the analysis of advanced prediction by using original data.
作者
张兴昶
Zhang Xingchang(Gansu Railtvay Comprehensive Engineering Investigation Institute,China Railuivay First Survey and Design Institute Group Co.,Ltd.,Lanzhou Gansu 730000,China)
出处
《工程地球物理学报》
2019年第5期596-600,共5页
Chinese Journal of Engineering Geophysics
关键词
声波有限差分模拟
负反射
物理模拟
finite difference simulation of acoustic wave
negative reflection
physical simulation
