Influence of deterioration of CRTSIII slab ballastless track irregularity on the safety and stability of high-speed vehicles

Abstract

As one of the major high-speed railway ballastless track structures in China, CRTSIII slab ballastless track has been laid for more than 6500 km. However, there are no detailed studies on its track irregularity deterioration throughout extended service periods, which may threaten the safety and stability of high-speed vehicles (HSV). In this study, a long-term tracking detection of CRTSIII slab ballastless track irregularities has been conducted, revealing its annual evolution law. An HSV-track coupled dynamics model was established to investigate the HSV dynamic responses under annual evolution of track irregularities. Considering the potential deterioration of track irregularities to extremely bad condition, the recommended classified limits for irregularity are proposed by analyzing the limit-exceeding probability of the safety and stability indexes of HSV. The results show that: taking 10 m wavelength as a demarcation, longer-wavelength irregularities exhibit larger amplitudes, faster evolution rates and a linear increasing trend, primarily affecting the stability of HSV. Conversely, shorter-wavelength irregularities exhibit smaller amplitudes and an insignificant evolution trend, predominantly affecting the safety of HSV. Furthermore, the periodic irregularity induced by the arching of 32 m simply-supported beam bridge should be paid closer attention to, as their evolution rate significantly surpasses that of irregularities at other wavelengths.

Keywords

high-speed railway / CRTSIII slab ballastless track / track irregularity deterioration characteristics / vehicle dynamic responses / track irregularity limit management

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Central South University