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Ground Squeezing Effects on the Analysis and Design of Tunnels

Amini Motlagh, Peyman | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48474 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sadaghiani, Mohammad Hossein
  7. Abstract:
  8. Ground squeezing is defined as time-dependent shear displacement of rock mass that causes the decrease of the calculated excavation area of tunnels.Ground squeezing is one of the phenomenons that causes serious problems including the collapse of tunnels’ walls and TBM jamming during the construction of tunnels. Hence, the assessment of ground squeezing is an essential issue in tunneling. In this thesis, different ground squeezing potential prediction methods will be assessed. These methods consist of empirical, semi-emperical, analytical, and numerical methods. After assessing the ground squeezing potential, if it is evaluated high for a project, it will be required to consider the time-dependent behavior of ground. For doing so, a time-dependent constitutive model should be utilized. In this research, after describing various time-dependent constitutive models, the hyperbolic creep model has been chosen and added to FLAC software.It is carried out by adding its FISH code to FLAC software. The code has been verified by comparing the results of numerical modeling and Phienwej’s analytical solution. A good agrrement between results shows that the hyperbolic creep model can be used as a reliable constitutive model for considering the time-dependent behavior of ground squeezing phenomenon
  9. Keywords:
  10. Tunneling ; Tunnel Boring Machine (TBM) ; FLAC Software ; Ground Squeezing ; Hyperbolic Creep Model

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