Assessing the Effect of Underground Tunnel Diameter on Structure-Foundation-Soil Performance under the Kobe Earthquake
Authors: Masoud Mahdavi
Today, developed and industrial cities have all kinds of sewage and water transfer canals, subway tunnels, infrastructure facilities, etc., which have caused underground cavities to be created under the buildings. The presence of these cavities causes behavioral changes in the structural behavior that must be fully evaluated. In the present study, using Abaqus finite element software, the effect of cavities with 0.5 and 1.5 meters in diameter at a depth of 2.5 meters from the earth's surface (with a circular cross-section) on the performance of the foundation and the ground (soil) has been evaluated. For this purpose, the Kobe earthquake was applied to the models for 10 seconds. Also, pore water pressure and weight were considered on the models to get complete results. The results showed that by creating and increasing the diameter of circular cavities in the soil, three indicators; 1) von Mises stress, 2) displacement and 3) plastic strain have had oscillating, ascending and ascending processes, respectively, which shows the relationship between increasing the diameter index of underground cavities and structural indicators of structure-foundation-soil.Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 187
 N. Yoshida, S. Nakamura, M. Iwafuji, H. Yoshimora, “Survey and Restoration of the Daikal Subway Station Damaged During the 1995 Hyogoken – Nanbu Earthquake”, Tunnels et Ouvrages Souterrains, No. 138, Decembre, 1996.
 S. Fabozzi, E. Bilotta, G. Lanzano, “A numerical study on seismic vulnerability of tunnel linings”, Proceedings of 3rd Performance Based Design in Earthquake Geotechnical Engineering, Vancouver, Canada, pp: 16–19, 2017.
 G. Tsinidis, F. de Silva, I. Anastasopoulos, E. Bilotta, A. Bobet, Y. Hashash, Ch. He, G. Kampas, J. Knappett, G. Madabhushi, N. Nikitas, K. Pitilakis, F. Silvestri, G. Viggiani, R. Fuentes, “Seismic behaviour of tunnels: From experiments to analysis”, Tunnelling and Underground Space Technology 99, 103334, 2020.
 D. Liu, F. Wang, Q. Hu, H. Huang, J. Zuo, C. Tian, D. Zhang, “Structural responses and treatments of shield tunnel due to leakage: A case study”, Tunnelling and Underground Space Technology 103, 103471, 2020.
 X. Chen, N. Zhang, Y. Gao, D. Dai, “Effects of a V-shaped canyon with a circular underground structure on surface ground motions under SH wave propagation", Soil Dynamics and Earthquake Engineering 127, 105830, 2019.
 X. Chen, “Research on Combined Construction Technology for Cross-Subway Tunnels in Underground Spaces”, Engineering 4, 103–111, 2018.
 Y. Liu, Zh. Wu, Q. Yang, K. Leng, “Dynamic stability evaluation of underground tunnels based on deformation reinforcement theory”, Advances in Engineering Software 124, 97–108, 2018.