Non-Linear Numerical Modeling of the Interaction of Twin Tunnels-Structure

Authors: A. Bayoumi, M. Abdallah, F. Hage Chehade

Abstract:

Structures on the ground surface bear impact from the tunneling-induced settlement, especially when twin tunnels are constructed. The tunneling influence on the structure is considered as a critical issue based on the construction procedure and relative position of tunnels. Lebanon is suffering from a traffic phenomenon caused by the lack of transportation systems. After several traffic counts and geotechnical investigations in Beirut city, efforts aim for the construction of tunneling systems. In this paper, we present a non-linear numerical modeling of the effect of the twin tunnels constructions on the structures located at soil surface for a particular site in Beirut. A parametric study, which concerns the geometric configuration of tunnels, the distance between their centers, the construction order, and the position of the structure, is performed. The tunnel-soil-structure interaction is analyzed by using the non-linear finite element modeling software PLAXIS 2D. The results of the surface settlement and the bending moment of the structure reveal significant influence when the structure is moved away, especially in vertical aligned tunnels.

Keywords: Bending moment, construction procedure, elastic modulus, relative position, soil, structure location, surface settlement, twin tunnels.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1126081

References:

[1] Yaghi, Z. (2011). Control room: a partial solution. Waiting for the power to decide the public transport system. SafeerJournal. Retrieved January 21, 2016 from: http://www.baladiyat.org/?p=4574
[2] Traffic Management Center Data
[3] Asmar, F. 2009. The Mediterranean Garden – Unpublished. Retrieved from: http://www.fao.org/ag/agp/agpc/doc/counprof/lebanon/lebanon.html
[4] Hage Chehade, F., Shahrour, I. (2012). Interaction Tunnels-Soil-Structure: Effect of the Tunnels Construction Procedure. JNGG2012-Bordeaux 4-6 juillet 2012.
[5] Dragojevic, S. (2012). Analysis of Ground Settlement Caused by Tunnel Construction. Gradevinar 7/2012. Retrieved November 2015, from: file:///C:/Users/20110100/Downloads/JCE_64_2012_7_4_1028_EN.pd
[6] Hage Chehade, F., Shahrour, I. (2008). “Interaction Tunnels-Soil-Structure: Numerical analysis of the interaction between twin tunnels: Influence of relative position and construction procedure”. Tunnelling and Underground Space Technology,23, 210-214.
[7] Wang, S., Yang, J., Yang, Y., Zhong, F. (2014). “Construction of Large-Span Twin Tunnels Below a High Rise Transmission Tower: A Case Study’’. Geotech Geol Eng (2014) 32:453-467
[8] Chakeri, H., Ozcelik, Y., Unver, B. (2015). “Investigation of ground surface settlement in twin tunnels driven with EPBM in urban area”. Arab J Geosci, 8:7655-7666.