Abstract：Abstract：Research purposes： The deformation of high speed railway bridge foundation (pier) would cause additional track irregularity of the ballastless track, and thus perform impact on train operation. This paper, based on the system of element slab ballastless track, established finite element model of the track, bridge superstructure, bearing and bridge pier, and the dynamic interaction model of train and track, respectively. Then, considering different deformation modes and values of bridge piers, the train running safety and comfort was analyzed and evaluated. Research conclusions： (1) The influence of the pier deformation on train operation was dependent on train speed, and the higher the train speed was, the more significant the influence was. (2) The influence of the lateral deformation of the pier on train operation was more significant than that caused by the settlement of the pier, and the safety of train operation was mainly affected by the lateral deformation in the case of the settlement and lateral deformation occurring simultaneously. (3) The train operation evaluation index increased as the bridge span decreased, especially when the pier lateral deformation was greater than 10 mm. (4) For the 32 m standard span bridge, if the pier settlement did not exceed 20 mm, the safety and comfort index of train operation did not exceed the limit; but when the pier lateral deformation exceeded 15 mm, the safety index for high-speed train has exceeded the limit. (5) The conclusions have some guiding significance for the management and control of bridge pier deformation for high speed railway.
2017, Vol. 34 
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