Study of the Tunnel Crown behavior Under the Influence of Near Field Earthquakes with Finite Element Method

Document Type : Research Paper


1 M.Sc. of Geotechnical Engineering, Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.

2 Ph.D. Candidate, Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran


Today, the use of underground structures and their numerous uses in urban and interurban transportation has been found to be of great importance and has become one of the topics discussed by engineers in the field of construction and civil engineering. One of the issues that have attracted the attention of the researchers in these structures is the resistance of these structures to the rejection of dynamic loads. Therefore, in the present article, the seismic behavior of the tunnel under the earthquake record in the near field has been studied with regard to overhead and overhead. To analyze this research, the seismic behavior of tunnel line 2 of Tabriz city trains was selected and using the abacus software and available geotechnical reports, the 2nd line of Tabriz city trains was studied. The results of this study indicate that, in case of overturning, the amount of deformation and strain in the tunnel crown increases, this increase is proportional to the earthquake record. The results also show that the behavior of the tunnel in case of overhead operation in relation to the non-overhead state is not under the earthquake record of the near-frontier zone, which is sensitive to soil layering, and the variation of the tunnel crown under both acceleration maps of Bam and Varzaghan in all sections of the Earth's crust is close to It has been. The results also indicate that on the route of line 2 of the city of Tabriz, despite the change in the characteristics of the soil mass in the path, the tunneling behavior has little sensitivity to soil layering in the path and if the tunnel is located at a depth of 22 meters from the ground level under the earthquake record There is not much deformation in the crown of the tunnel.


Main Subjects

[1]-Moller, S. and Vermeer , P., (2010). Tunneling and Underground Space Tmechnology, Vol.23, pp. 461-475.
[2]-Suwansawat , S., (2002). Earth Pressure Balance (EPB) shield Tunneling in Bangkok: Ground response and prediction of surfaceSettlements Using Artificial Neural Networks. Doc. Of Science in Civil and Env. Eng., Massachusetts institute of Technology.
[3]- Cilingir, U. and Gopal Madabhushi, S. (2011). A model study on the effects of input motion on the seismic behaviour of tunnels. Soil Dynamics and Earthquake Engineering, Vol.31, No.3, pp.12-35.
[4]-Fabozzi, S., Licata, V., Autuori, S., & Bilotta, E. (2017). Prediction of the seismic behavior of an underground railway station and a tunnel in Napoli (Italy). Underground Space, Vol.2, No.2, pp. 45-61  
[5]- Bao, X., Xia, Z., and Ye, G. (2017). Numerical analysis on the seismic behavior of a large metro subway tunnel in liquefiable ground. Tunnelling and Underground Space Technology, Vol.6, No.6., pp.35-52.
[6]-Zhou H, Meng F, Zhang C, Hu D, Yang F, Lu J. (2015). Analysis of rockburst mechanisms induced by structural planes in deep tunnels. Bulletin of Engineering Geology and the Environment, Vol.74, No.4, pp.1435-1451.
[7]-Manouchehrian A. and Cai M. (2016). Simulation of unstable rock failure under unloading conditions. Canadian Geotechnical Journal, Vol.53, No.1, pp.22-34.
[8]- Zhang, Z. and Huang, M. (2014). Geotechnical inuence on existing subway tunnels induced by multiline tunneling in Shanghai soft soil, Computers and Geotechnics, Vol.56, pp.121-132.