Track stiffness assessment UIC（轨道刚度评估UIC）.pdf

Track stiffness assessment Alain Robinet, Engineering Department, SNCF, France Email: alain.robinet@sncf.fr Mohsen Hosseingholian, Civil Engineering Department, University of Caen, France Email: mhosseingholian@ Alain Quibel, Centre d’Experimentation Routière, CETE – NC, France Email: alain.quibel@equipement.gouv.fr Michel Froumentin, Centre d’Experimentation Routière, CETE – NC, France Email: michel.froumentin@equipement.gouv.fr Abstract A good track support and its homogeneity are very important parameters for long-term stability of track geometry and a good life cycle cost of the track. The overall vertical support is provided by various substructure layers including the ballast, subballast, and subgrade layers. Weak modulus and non-uniform support from these layers can cause poor track geometry under traffic loading, which in turn will accelerate track component degradation and lead to the degradation of vehicle performance. Track reliability has nowadays become particularly important due to increased traffic densities, heavier axle loads, and shorter maintenance periods. To improve track maintenance efficiency as well as railroad operational performance, a continuous vertical track support measurement method was to be tested. We will present a feasibility research dealing with the suitable parameters to develop a new, non destructive, continuous method to measure track stiffness have been tested. The aim of the research was to adapt the “Portancemeter” to the track support measurement. This technique is implemented to measure the platform modulus currently in France. The improvements would be achieved through identification of high-priority track repair locations in order to aid in optimizing maintenance, and to observe track strength degradation. These improvements fa