Seismic Response Characteristics of Utility Tunnels Crossing River Considering Hydrodynamic Pressure Effects

• DOI: 10.20944/preprints202410.0480.v1
• Publication Date: 2024-10-09T03:13:42Z
• Authors: Yuanhong Wang; Yang Zhang; Ziyuan Huang; Konghao Wang; Aiping Tang
• Keywords: Lateral earth pressure; Seismic loading

As a long lifeline system of buried structures, Utility tunnel (UT) is vulnerable to earthquake invading. For utility tunnels with inverted siphon arrangement crossing the river, seismic response more complex due basin effect acceleration in topography and influence fluctuating hydrodynamic pressure. Based on UT project Haikou, this paper studied cast-in-place considering coupled model water-soil-tunnel structure ABAQUS software. Herein, dynamic fluctuation pressure simulated using acoustic-solid interaction model. A viscoelastic artificial boundary was used simulate soil effect, loads were equivalent nodal forces. Considering invading direction varying water elevation, investigates characteristics damage mechanisms river-crossing tunnels. The study shows that effects cause different amplifying around sections, greater bidirectional excitation, which concentrated at junction transition between horizontal section vertical section; Bending moments axial forces are dominant mechanical behaviors along direction; river level change influences internal distribution tunnels, showing certain amount energy dissipation damping effects. aseismic design cross-river calculations should be performed, not neglected.