飞机起降滑行对下穿高速铁路轨道结构的影响

Influence of Aircraft Take Off,Landing and Taxiing on Track Structure of Underneath High Speed Railway

以成都—自贡高速铁路下穿天府机场段轨道结构为研究对象,建立车辆-轨道-隧道-土体-跑道三维空间耦合有限元模型,分析了飞机起降滑行时车体和轨道结构的动力响应,验证了轨道结构的安全性和稳定性。结果表明:飞机在跑道上滑行起降对高速列车运行的安全性和舒适性存在一定影响;在移动飞机附加荷载作用下,钢轨产生的相对轨道板的最大垂向位移为0.04 mm;在轨道叠加不平顺的条件下,车体垂向、横向振动加速度均未超过Ⅰ级安全限值,垂向、横向平稳性均为一级,钢轨轮轨垂向、横向力及脱轨系数、轮重减载率均未超限;轮重减载率幅值较高,高速行车对1 m以下的短波长不平顺的影响须引起重视。

Taking the track structure of Tianfu airport underneath section in Chengdu-Zigong high speed railway as the research object,a three-dimensional space coupling finite element model of vehicle-track-tunnel-soil-runway was established to analyze the dynamic response of vehicle body and track structure during aircraft take-off,landing and taxiing,and verify the safety and stability of track structure.The results show that the safety and comfort of high speed trains are affected by the aircraft taxiing,take-off and landing on the runway.Under the additional load of mobile aircraft,the maximum vertical displacement of rail relative to track slab is 0.04 mm.Under the condition of track superposition irregularity,the vertical and lateral vibration acceleration of vehicle body does not exceed class Ⅰ safety limit,the vertical and lateral stability are class I,and the vertical and lateral forces of rail wheel rail,derailment coefficient and wheel load reduction rate are all less than limits.The amplitude of wheel load reduction rate is high,so it is necessary to pay attention to the influence of short-wave irregularity which is below 1 m when trains are driving at high speed.