CAJ | 학술논문

高速列车行车时产生的动力荷载大小受多种因素影响,以列车运行速度的影响尤为关键.由于车辆-轨道-路基结构的复杂性,要通过理论计算准确地确定行车速度对动力荷载的影响并不容易.目前足尺物理模型试验已成为高速铁路无砟轨道路基结构动力性能研究的重要手段.根据沪宁城际无砟轨道设计和施工标准,建成室内1:1无砟轨道路基模型,通过单个轮轴的动态激振试验获得I型轨道板动应变幅值及路基动土压力幅值随加载频率的变化规律,在该基础上得到列车动荷载随行车速度的变化规律.结合德国铁路动力荷载放大系数的计算公式,提出确定高速铁路I型轨道结构动力荷载放大系数的方法,并分别获得轨道板与路基结构动力荷载放大系数随列车运行速度的变化规律,可为我国 I 型轨道-路基系统设计动力荷载的确定提供依据.
고속열차행차시산생적동력하재대소수다충인소영향,이열차운행속도적영향우위관건.유우차량-궤도-로기결구적복잡성,요통과이론계산준학지학정행차속도대동력하재적영향병불용역.목전족척물리모형시험이성위고속철로무사궤도로기결구동력성능연구적중요수단.근거호저성제무사궤도설계화시공표준,건성실내1:1무사궤도로기모형,통과단개륜축적동태격진시험획득I형궤도판동응변폭치급로기동토압력폭치수가재빈솔적변화규률,재해기출상득도열차동하재수행차속도적변화규률.결합덕국철로동력하재방대계수적계산공식,제출학정고속철로I형궤도결구동력하재방대계수적방법,병분별획득궤도판여로기결구동력하재방대계수수열차운행속도적변화규률,가위아국 I 형궤도-로기계통설계동력하재적학정제공의거.
There are lots of factors that affect the dynamic load induced by high-speed train;the train speed is one of the most critical factors. It is rather difficult to determine the effect of train speed on dynamic load using theoretical method due to the complexity of vehicle-track-subgrade interaction. Large-scale physical model test has gradually become one of the most popular approaches for studying the dynamic characteristics of ballastless track structure of high-speed railway. A full-scale model of ballastless track subgrade was constructed based on the design and construction standard for high-speed railway line from Shanghai to Nanjing. The dynamic strain of type I slab and dynamic soil pressure of subgrade were obtained by conducting single wheel axel exciting test. The relationship between dynamic load and train speed was presented. The dynamic load magnification factors of slab and subgrade structure under different train speeds are obtained respectively. The magnification factors are of great significance for designing the dynamic load in type I track-subgrade system.