Dynamic Response Analysis of Underground Utility Tunnel during the Propagation of Rayleigh Wave

摘要

As a kind of shallow buried underground structures, underground utility tunnel’s damage under earthquake is mainly due to surface wave like Rayleigh wave. The dynamic response analysis of underground utility tunnel during the passage of Rayleigh wave is thus explored in this paper. Rayleigh wave is first generated using the Approximate Rayleigh Earthquake Wave Method, and is employed to determine equivalent boundary forces applied to the model boundary. Two-dimension free field finite element model is then established to verify the validity of Rayleigh wave input method taking ABAQUS as a platform. Then two-dimension soil-structure interaction finite element model is set up, in which utility tunnel element and soil element are modeled by 4-nodes plane strain element (CPE4). The state nonlinear property of local slippage, open and closure between soil and structure is considered by the master-slave surfaces. Finally, numerical results show that the propagation of Rayleigh wave can be the key factor to trigger the vertical vibration of shallow underground structures. So it’s important to consider the Rayleigh wave effect for seismic design of underground utility tunnel.