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Analysis of Stability and Ground Settlement in Construction Stages of Underground Exchange Station between Line 3 and 4 At Mashhad Subway

Lamei, Amin | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50789 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sadaghiani, Mohammad Hossein
  7. Abstract:
  8. Deformation and Settlement of the ground surface and stability of large underground space is the main concern in the excavation under urban area. In order to control settlement and increase stability, it is necessary to use pre-Supporting system prior to excavation. Concrete Arc Pre-supporting System (CAPS) is one of the most useful pre-supporting methods which is used in exchange station of line 3 and 4 of Mashhad subway. Line 3 and 4 are parallel in Shohada square and the groundwater level is above the whole station structure. To analyze deformation of the ground due to excavation stages, the station was modeled in 2D and 3D by Abaqus. In this study, to estimate ground Deformation, we need to investigate following items: Presence and absence of CAPS, the distance between pile and rib, number of piles and ribs used prior to excavation. Finally following parameters analyzed: friction angle , cohesion ,module of elasticity, the coefficient of permeability, the rate of excavation and groundwater table. 3D modeling shows less ground settlement than 2D modeling and 2D modeling anticipates the settlement 37% more than 3D modeling. The excavation of first floor of N3 causes more ground settlement than other stages (46% of final settlement).This study shows CAPS has a large effect on controlling settlement and reduces it dramatically and absence of this system increases the settlement up to 800%. The distance between piles and ribs and number of these elements used prior to excavation have a great effect on ground settlement
  9. Keywords:
  10. Numerical Modeling ; Two Dimentional Modeling ; Three Dimensional Modeling ; ABAQUS Software ; Groundwater ; Concrete Pre-Supporting System (CAPS) ; Underground Metro Stations

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