Parametric Analyses of Urban Metro Tunnels Subject to Bedrock Dislocation of a Strike-Slip Fault

As an essential part of lifeline engineering, the subway tunnel is the hub of traffic and transportation. With the development of the economy, the social demand for it is increasing. Although faults should be avoided as much as possible in the process of route selection for tunnels, the tunnel, as a long linear structure, in some cities will be inevitably crossed by faults in the construction. In this paper, the seismic response of a shallow buried subway tunnel crossing an active strike-slip fault is analyzed subject to bedrock fault dislocations. Based on the 3D modeling of the tunnel using the finite element software ABAQUS, the displacement and stress of the tunnel lining structure are calculated with the change of five factors, including fault-tunnel crossing angle, bedrock overburden thickness, tunnel buried depth, lining thickness, and soil properties. The influence of the various factors on the structural seismic response of the tunnel under the bedrock dislocations is discussed. The analysis results can be used as a reference for performance-based design for tunnels crossing active faults.