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Numerical Modelling of Buried Pipelines Reinforcement in Slopes under Dynamic Loads Based on Physical Model Tests

Saheb, Sohail | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51389 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jafarzadeh, Fardin
  7. Abstract:
  8. Behavior and retrofit methods of buried pipes in slope under dynamics loading are investigated in FLAC 2D. Hysteretic damping is used to represent of soil damping and compared with Rayleigh damping model. Mohr-coloumb and elasto-plastic model are adopted for soil and pipe constitutive model respectively. Young modulus is defined as function of stress level and shear strain. Displacements and accelerations of numerical model was compared with the physical model on the shaking table tests. Influence of different parameters like young modulus, reference shear strain and dilation angel is investigated. Interaction model between soil and pipe is considered as elasto-plastic with separation and slippage potential. Influence of increasing the depth of buried pipes and using geofoam at different locations near pipes on retrofit are investigated with numerical modelling. Modelling results shows generally displacement of the pipes decreases, furthermore, moment and shear forces in the pipes increases with increasing of the depth of buried pipes. Placing geofoam behind of pipes at slope toe and infront of pipes at slope crown causes decreasing of displacement and internal forces of the pipes respectively. Best location for geofoam to retrofit of the buried pipes at crown and toe are infront and behind of pipes respectively. Results also show that using geofoam behind or infront of the pipes decreases amplitude of acceleration
  9. Keywords:
  10. Numerical Modeling ; Physical Modeling ; Buried Pipline ; Slope Instability ; Hysteresis Damping

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