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Analysis Of Tunneling - upper Structure Interaction in The State of Underground Water Drainage During Excavation Using Three-Dimensional Numerical Modeling
Azizabadi Farahani, Mohsen | 2015
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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 48268 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Sedghiani, Mohammad Hossein
- Abstract:
- Excavation of tunnel beneath groundwater level, and drainage of water from the sides of the tunnel, causes disturbance of hydrogeological balance and change in the stress and pore water pressure distribution, which causes ground subsidence. Various parameters effect on stress distribution and surface settlement caused by tunneling. In this thesis, Effects of soil geotechnical properties such as the angle of internal friction, cohesion, modulus of elasticity, permeability and tunnel parameters such as depth, depth of groundwater level, the tunnel advance rate, structure weight, foundation eccentricity relative to the axis of the tunnel and foundation dimensions are evaluated. To do this with coorperation of the contractor, geotechnical data and geometric information of the east-west section of line 7 of Tehran’s subway which is excavating by TBM-EPB method is used. For numerical analysis of three dimensional consolidation and simultaneous solving of stress-seepage equations, Abaqus 6.12-3 was used. Constitutive model for soil is Mohr-Coulomb plasticity and for concrete is linear elastic. The results of the modeling show that the pore water pressure changes caused by tunnel excavation is influenced by modulus of elasticity and parameters of seepage such as permeability, groundwater level, the tunnel advance rate (time). Comparison of this results shows some factors such as permeability coefficient, position of groundwater table and modulus elasticity of soil are more effective on surface settlements than other factors. So that by increasing the modulus of elasticity and reducing the groundwater level and soil permeability, ground subsidence decreases. It also increasing the structure weight, angle of internal friction, cohesion and tunnel advance rate reduce the amount of soil subsidence
- Keywords:
- Numerical Analysis ; Line 7 Tehran Metro ; Three-Dimensional Seepage ; Tunneling-Structure Interaction ; Drained Groundwater
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