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Seismic Response Law of a Tunnel in a Stratified Rock Mass
(1 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031;2 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031; 3 School of Transportation and Logistics, Southwest Jiaotong University, Chengdu 610031)
Abstract The seismic response law of tunnels in stratified rock masses is studied considering the characteristics of the transverse isotropy of a stratified rock mass. An aseismic calculation formula for a tunnel in a stratified rock mass is derived based on the free-field deformation method and results of research on phase velocity in a three-dimensional transversely isotropic medium. A large number of numerical calculations are conducted based on the physical parameters of certain stratified rock masses and the variables of incident angle of the seismic wave, dip angle and ratio of the elastic moduli parallel and perpendicular to the rock stratum. The law of the tunnel′s seismic response and the working conditions corresponding to the maximum strain are obtained by comparing the results of the analysis and calculations.
Abstract：
The seismic response law of tunnels in stratified rock masses is studied considering the characteristics of the transverse isotropy of a stratified rock mass. An aseismic calculation formula for a tunnel in a stratified rock mass is derived based on the free-field deformation method and results of research on phase velocity in a three-dimensional transversely isotropic medium. A large number of numerical calculations are conducted based on the physical parameters of certain stratified rock masses and the variables of incident angle of the seismic wave, dip angle and ratio of the elastic moduli parallel and perpendicular to the rock stratum. The law of the tunnel′s seismic response and the working conditions corresponding to the maximum strain are obtained by comparing the results of the analysis and calculations.
2017, Vol. 54 