Analysis of Seismic Wavefield Characteristics in 3D Tunnel Models Based on the 3D Staggered-Grid Finite-Difference Scheme in the Cylindrical Coordinate System

The accurate prediction of the geological conditions ahead a tunnel plays an important role in construction. Among all forward prospecting methods, seismic detection method is widely applied. However, due to characteristics and complexity conditions, wavefield complicated. Carrying out more realistic modeling vital for fully understanding law wave propagation tunnel. In this paper, 3D staggered-grid finite-difference scheme cylindrical coordinate system based on decoupled nonconversion elastic equation used carry numerical simulation. This can avoid diffraction interferences produced at edges face Cartesian system. Based method, laws waves under three kinds common typical unfavorable models were explored, which provide theoretical guidance data interpretation practice.