The study of seismic behavior of circular crossing tunnels in different conditions

Articles in Press

Document Type : Original Article

Authors

Department of Civil Engineering, Faculty of Civil Engineering and earth Resources, Central Tehran Branch, Islamic Azad University, Tehran, Iran

10.22034/tri.2024.421905.3198

Abstract

With the increase in population and the development of urban transportation infrastructure, there is a trend of building more urban subways and, as a result, the intersection of tunnels. The present article investigates the seismic behavior of circular cross tunnels (metro) in FLAC 3D finite difference software. The variables of this research included the distances between two tunnels, the depth of the tunnels, the angles between the tunnels and the type of soil. Different models have been investigated and analyzed by comparing the amount of total displacement, settlement and stress. Finally, by evaluating the results, it was observed that by decreasing the depth of the tunnels, the displacements increased and also by increasing the angle between the tunnels, the amount of displacements decreased. The type of soil is of particular importance in seismic analysis, and with the decrease of the modulus of elasticity (E) and the finer grains of the soil, the impact of waves on the soil and the structure has increased significantly. The results show that the depth of the tunnels up to 19%, the distance between two tunnels up to 19.5%, the type of soil up to 37% and the angle between the tunnels up to 67% were effective in the amount of total displacement.

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Main Subjects

Journal of Transportation Research

Articles in Press, Accepted Manuscript
Available Online from 20 April 2024

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