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Numerical Investigation of the Effects of Different Geotechnical Parameters and Train Speed on the Train-Induced Vibrations

Rahmani, Ali | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56965 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadi, Mohammad Mehdi
  7. Abstract:
  8. Train-induced vibrations may become a source of annoyance to the residential environments and disturb the vibration-sensitive instruments. This paper aims to numerically study train-induced vibrations and affecting parameters such as foundation of the building adjacent to the railway, soil stiffness value and its variation pattern in depth and the train speed. To this end, a plane strain model was developed using finite difference program, FLAC2D. In order to simulate possible material damping of soil subjected to dynamic loading, hysteretic damping is incorporated into the model. The results of analyses performed in this study showed that increasing the train speed may not lead to an increase in the induced vibrations, and there is a critical speed in which the maximum vibration level occurred on the surface. The results also showed that presence of foundation causes a decrease in the level of vibrations by different degree depending on the foundation type. Also it was observed that increasing the soil stiffness causes a decrease in the vibration levels. Moreover it was concluded that linear and square root soil stiffness variation pattern in depth leads to similar level of vibrations but higher than induced vibrations in constant soil stiffness case
  9. Keywords:
  10. Numerical Modeling ; Finite Difference Method ; Parametric Study ; Hysteresis Damping ; Waves Constructive Interference ; Ground Vibrations ; Train Velocity

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