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<p>The track transition zone is referred as critical zone as it causes differential settlement, acceleration amplification, and stiffness reduction due to varying end support conditions which leads to passenger discomfort, operational delays, and huge maintenance cost. The existing mitigation measures for smooth transition are largely site specific. Hence, field investigation is crucial to analyse and propose a mitigation measure to ensure effective transition zone. The present study investigates the dynamic response of India’s first elevated ballasted track by placing various sensors at critical locations focusing the culvert-embankment-abutment-bridge approach for length of 50&#xa0;m. A total 22 sensors such as piezoelectric accelerometers, strain gauge-based accelerometers, strain gauges, linear variable differential transformers are placed in track superstructure (rail and sleeper) and substructure layers (Ballast and subballast) to capture and evaluate the dynamic response such as settlement, acceleration, load distribution, and trackbed stiffness under moving train conditions of passenger train and freight train. This study identifies and reveals a critical short span of 2.5&#xa0;m that exhibit significant transition characteristics in the complete transition zone of 50&#xa0;m which could potentially optimize the maintenance cost. A hybrid transition slab is proposed based on the performance parameters measured using field instrumentation.</p>

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Field Investigation of Dynamic Response of Elevated Ballasted Track Focusing on Transition Zone

  • 期刊论文

  • 发表日期：

    2026年1月15日

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  • Sujitha Soundararajan,
  • Prishati Raychowdhury,
  • Sanjay Nimbalkar,
  • Samit Ray-Chaudhuri

摘要

The track transition zone is referred as critical zone as it causes differential settlement, acceleration amplification, and stiffness reduction due to varying end support conditions which leads to passenger discomfort, operational delays, and huge maintenance cost. The existing mitigation measures for smooth transition are largely site specific. Hence, field investigation is crucial to analyse and propose a mitigation measure to ensure effective transition zone. The present study investigates the dynamic response of India’s first elevated ballasted track by placing various sensors at critical locations focusing the culvert-embankment-abutment-bridge approach for length of 50 m. A total 22 sensors such as piezoelectric accelerometers, strain gauge-based accelerometers, strain gauges, linear variable differential transformers are placed in track superstructure (rail and sleeper) and substructure layers (Ballast and subballast) to capture and evaluate the dynamic response such as settlement, acceleration, load distribution, and trackbed stiffness under moving train conditions of passenger train and freight train. This study identifies and reveals a critical short span of 2.5 m that exhibit significant transition characteristics in the complete transition zone of 50 m which could potentially optimize the maintenance cost. A hybrid transition slab is proposed based on the performance parameters measured using field instrumentation.