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Numerical Analysis of Mechanized Tunneling Effects in Different Conditions on Internal Forces and Settlement of Superstructures

Shirazi, Mohammad Hassan | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52215 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadi, Mohammad Mahdi
  7. Abstract:
  8. In this research with Finite Element Methods in ABAQUS, numerical modeling has done in three-dimensions, which can be used to determine the effect of different factors on the surface settlement. Also, various factors such as geotechnical conditions, tunnel diameter,tunnel depth, the impact of the thickness of the segments and the amount of eccentricity of the structure relative to the longitudinal axis of the tunnel considered in this study. Face Pressure Supports, and Grout Injection Pressures are taken into account, too.Tunnel drilling causes a change in the displacement area and creates a changing zone around the tunnel. In this regard, not only adjacent buildings will be affected by drilling, but also various parameters of different structures will change the displacement area around the tunnels. Observations show that the presence of surface structures has a dual effect on the surface. Increasing the weight of the building increases the level of the ground subsidence, and on the other hand, regardless of the loading of the building, due to the existence of the structure and its foundation, it improves the conditions of the earth, the surface settlement decreases. In this study, the construction of the building studied by TBM-EPB tunnel excavation, and also the effects of the tunneling caused on the internal forces of the building have investigated. The results indicate that increasing the amount of settlement of the building, the axial force of the peripheral columns has increased, but the axial force of the central column decreases. The bending moment of the beams parallel to the longitudinal axis of the tunnel is almost constant, bending beams that are perpendicular to the tunnel axis undergo significant changes in their moments. Finally, by examining the potent parameters on settlement in the EPB method, the most critical parameters affecting the surface settlement have been discovered. Also, for the setting "i" in the Gaussian distribution of the transverse profile settlement, proposed a new umerical relation. Also, by studying different models, a new formula is recommended for maximum ground subsidence by drilling. The proposed equations are the other results of this study to find the maximum percentage of bending moment variations and the maximum percentage change in the axial force of the columns due to EPB tunneling
  9. Keywords:
  10. Tunneling ; Interaction ; Bending Moment ; Axial Load ; Tunnel Boring Machine (TBM) ; Earth Pressure Balanced (EPB)Tunneling

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