Long-term Temperature Gradient Test of Ballastless Track on Bridge-subgrade Transition Section

SU Chengguang

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Journal of Railway Engineering Society ›› 2022, Vol. 39 ›› Issue (2) : 56-61.

Main Line: Railway and Rail

Long-term Temperature Gradient Test of Ballastless Track on Bridge-subgrade Transition Section

SU Chengguang

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Abstract

Research purposes: In order to reduce the damage of warping and cracking of the ballastless track and ensure the safe and stable operation of the high-speed railway, the one year temperature gradient test of ballastless track on Shanghai-Hangzhou high-speed railway bridge-subgrade transition section was conducted. The temperature gradient distribution and probability distribution of track slab and concrete roadbed are statistically analyzed.
Research conclusions: (1) The temperature gradient in the upper track slab is significantly larger than that in the whole track slab. Hence, the temperature gradient in the upper track slab should be chosen for track safety design. (2) The probability of negative temperature gradient in the track slab is greater than the positive temperature gradient. The major temperature gradient range is -30 ℃/m~0 ℃/m for two thirds of one year. (3) The temperature gradient range of concrete roadbed is much smaller than that of the track slab, and its major range is -4 ℃/m~4 ℃/m. (4) The probability distribution of the track slab and the concrete roadbed temperature gradient obeys the exponential function distribution. (5) The research results can provide a theoretical basis for the design, construction and maintenance of ballastless track applied on bridge-subgrade transition section.

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ballastless track / temperature gradient / statistical analysis / experimental research

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SU Chengguang. Long-term Temperature Gradient Test of Ballastless Track on Bridge-subgrade Transition Section[J]. Journal of Railway Engineering Society, 2022, 39(2): 56-61

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