Seismic Forward Modeling in Cylindrical Coordinates Based on Tunnel Model
In the process of tunnel construction, the tunnel seismic prediction is one of the effective methods to understand the bad geological conditions and geological hazards in front of the tunnel face.However, due to the lack of a profound understanding of basic theoretical knowledge in the tunnel seismic prediction, it often results that failing to report the bad geology in front of the tunnel face.Forward modeling is an effective way to solve the above problems, which can provide an effective theoretical basis for the tunnel seismic prediction method.At present, most of the methods for forward modeling of tunneling seismic prediction are based on the numerical simulation method in Cartesian coordinates, but Cartesian grid can not accurately describe the cylindrical boundary of the tunnel.According to the characteristics of the actual tunnel cylindrical space, a new method of seismic wave numerical simulation of the tunnel in the cylindrical coordinates is proposed.Then, the simulation results of cylindrical coordinate system and rectangular coordinate system are compared and analyzed.Through comparative analysis, it can be found that the scattering and dispersion of meshes in the grid numerical simulation are obviously reduced compared to the traditional rectangular grid numerical simulation.Finally, it can be found that the seismic wave field simulating of the tunnel in the cylindrical coordinate system can improve the numerical simulation accuracy if the calculation is not much different.
Cylindrical coordinates finite difference tunnel and numerical simulation
Chong Yi Yutao Liu Fei Cheng Jiangping Liu
Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan College of Marine Science and Technology, China University of Geosciences, Wuhan
国际会议
杭州
英文
46-51
2018-06-10（万方平台首次上网日期，不代表论文的发表时间）