High-speed trains have become the need of the hour as they are capable of meeting the ever-increasing demand placed on railways. Despite sounding lucrative, there were a number of issues with it. The most critical one was that of excessive dynamic amplification of the vertical motion when trains approach the Rayleigh wave velocity of the underlying ground. It was the case of Ledsgard (2000) which attracted many researchers around the world to study this phenomenon of critical velocity with reference to railways. A few of them suggested increasing the track stiffness and providing wave impeding barriers as the countermeasure for these excessive dynamic amplifications of the vertical motion. In this study attempts have been made to provide vertical stiffness with the help of piles. To carry out the analysis, Plaxis 3D software has been used for modelling the problem. The problem domain has a simple case of a slab resting on the soil and subjected to moving point load. The validation has been provided against the analytical solution present in the literature for the case of beam on a half-space subjected to moving load. Apart from finding the effect of piles on the vertical motion of slab, observations have been made regarding the critical speed as well. Some interesting response was found when it was attempted to make the slab lose contact with soil and make it rest on piles alone. The mitigation measures explored in this study were found effective in reducing the amplification of vertical motion and had the potential of being employed in the future research.

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Dynamic Response of Railway Track Supported by Piles Due to High-Speed Trains

  • Utkarsh Mishra,
  • V. A. Sawant,
  • J. P. Sahoo,
  • V. A. Patil

摘要

High-speed trains have become the need of the hour as they are capable of meeting the ever-increasing demand placed on railways. Despite sounding lucrative, there were a number of issues with it. The most critical one was that of excessive dynamic amplification of the vertical motion when trains approach the Rayleigh wave velocity of the underlying ground. It was the case of Ledsgard (2000) which attracted many researchers around the world to study this phenomenon of critical velocity with reference to railways. A few of them suggested increasing the track stiffness and providing wave impeding barriers as the countermeasure for these excessive dynamic amplifications of the vertical motion. In this study attempts have been made to provide vertical stiffness with the help of piles. To carry out the analysis, Plaxis 3D software has been used for modelling the problem. The problem domain has a simple case of a slab resting on the soil and subjected to moving point load. The validation has been provided against the analytical solution present in the literature for the case of beam on a half-space subjected to moving load. Apart from finding the effect of piles on the vertical motion of slab, observations have been made regarding the critical speed as well. Some interesting response was found when it was attempted to make the slab lose contact with soil and make it rest on piles alone. The mitigation measures explored in this study were found effective in reducing the amplification of vertical motion and had the potential of being employed in the future research.