Abstract
In tunneling projects, determining the tunnel alignment is one of the early decisions in the planning process. The alignment is chosen according to feasibility studies of the project. Usually, a curvature of the alignment is inevitable, especially in urban tunneling when certain locations such as exit points, locations with sensitive surface structures and difficult ground conditions must be a priori considered. Mechanized tunneling presents an effective and widely used construction method, in particular, in soft ground conditions and in presence of ground water. A realistic simulation of mechanized tunneling process requires a reliable numerical model that accounts for the different construction stages and all relevant interactions; between the surrounding soil medium and the shield machine during the machine advancement and between the soil and tunnel linings via the grouting mortar.
The stresses in tunnel linings are influenced by construction conditions, ground conditions, and shield thrust. Tunnel lining design requires a proper estimate of structural forces in linings. The segmental linings in curved zones during advancement require special attention to account for expected extra stresses and to avoid possible cracking.
To predict the stress evolution in lining during tunneling process, a 3D finite element model (ekate) has been developed which is able to simulate the staged mechanized tunneling process along arbitrary curved alignments. In this paper, the structural loading on a curved aligned tunnel lining segments in different construction stages is discussed. The loading on the lining is directly determined from the modelling of all interactions between the installed tunnel linings and the advancing tunnel boring machine with the surrounding soil. The eccentric thrust forces acting on the lining are mechanically considered in the process-oriented simulation model. The aim of this numerical study is to investigate the influence of these complex interactions on the loading and the induced stresses in the tunnel linings.
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Acknowledgments
Financial support for this work was provided by the German Science Foundation (DFG) in the framework of sub-projects C1 of the Collaborative Research Center SFB 837 “Interaction modeling in mechanized tunneling”. This support is gratefully acknowledged.
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Marwan, A., Alsahly, A., Abd Elrehim, M.Z., Meschke, G. (2018). Lining Induced Stresses for Mechanized Tunneling Along Curved Alignment. In: Agaiby, S., Grasso, P. (eds) Engineering Challenges for Sustainable Underground Use. GeoMEast 2017. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-319-61636-0_4
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