Dynamics Response Simulation Analysis of Underground Space Semi-suspended Lanes under Double-decker Vehicle Loads

Abstract

Objective The new prestressed hanging wall semi-suspended lane structure in underground complex offers advantages of aesthetic appearance and large clearance. However, the research on the mechanical properties of the new structure is still in the initial stage, necessitating an in-depth study on the mechanical characteristics of this semi-suspended lane structure. Method Based on an interval of the semi-suspended lane slab tunnel in Shenzhen Huangmugang Underground Comprehensive Transportation Hub, a 3D finite element model of the underground complex semi-suspended lane slab is established using Midas/GTS software. The dynamics response laws of displacement, acceleration, and stress under the influence of double-decker vehicle loads are analyzed. Result & Conclusion The results indicate that under vehicle dynamic loads, the displacement and acceleration response are the highest at lane slab center and gradually decrease towards the side wall connections. The peak displacement response of the lane slab is approximately 4.6 to 12.3 times greater than that of the hanging wall, roof slab and side wall, while the peak acceleration response of the above three places is about 4.0% to 21.6% of that of the lane slab center. Under dynamic loads, significant stress response occurs at the lane slab center and its connection to side wall, with a stress concentration observed at these connection points, showing slight asymmetrical deformation characteristics. The displacement and acceleration response amplitude of the hanging wall are notably affected by the top-decker vehicle loads, with increasing amplitudes significantly higher than in other areas.

Keywords

• comprehensive transportation hub
• semi-suspended lane slab
• prestressed hanging wall
• double-decker vehicle load
• dynamic response