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Parametric Analysis of Interaction Between Crossing Tunnel with Existing Metro Station at Different Levels

Asgarpanah Soveiri, Mohammad Reza | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42385 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sedghiani, Mohammad Hossein
  7. Abstract:
  8. The interaction of perpendicularly tunneling beneath existing metro station is investigated. In this paper E4R7 station, in line 7 of Tehran Metro (Tehran Urban and Suburban Railway co., TUSRC); Iran has been studied. This existing station has some special specifications such as a new pre-supporting system that is called Concrete Arch Pre-supporting System (CAPS). Construction of CAPS is mainly based on an Old Iranian small water tunnels excavation method, Quanat, which is faster and more economical than other common methods. CAPS is a rib like structure consisting of concrete piles and arch beams constructed around underground space before its construction. This method has been utilized in several underground stations in Tehran Metro since 2002 and can be used for large underground spaces in similar ground conditions. In design of new tunnel (with an EPB shield machine) of the extension of line 7, it is important to ensure that any existing underground transportation systems in close proximity to the tunneling activities can continue operating safely both during and after construction. If the existing station is influenced by the construction of new tunnel, it may be serious because repair of any damage is both time consuming and expensive. Therefore, it is necessary to understand the mechanisms between station and tunnel due to the construction of new tunnel. Full three-dimensional (3D) finite element analysis with elasto-plastic models is used to simulate all the construction stages and analyze the ground behavior. It is concluded that the distance between underground structures and supporting system characteristics have notable effect on ground deformation. On the other hand, in order to ensure the stability of existing station final support, special attention should be paid to side facing towards the tunneling direction
  9. Keywords:
  10. Metro Stations ; Soil-Structure Interaction ; Numerical Modeling ; Finite Element Modeling ; Intersections ; Concrete Pre-Supporting System (CAPS)

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