高速铁路跨越活动断裂带轨道结构选型

Type Selection of Track Structure of High Speed Railway Crossing the Active Fault Zone

针对高速铁路跨越活动断裂带特点,提出轨道结构选型原则;针对有砟轨道、无砟轨道和聚氨酯固化道床结构特点,以及活动断裂带的适应性进行分析,提出活动断裂带轨道结构选型建议。研究表明,设计时速250 km及以下线路,优先采用有砟轨道;设计时速300 km及以上线路,为保证全线无砟轨道结构形式统一,活动断裂带范围可采用单元式的无砟轨道结构。结合活动断裂带活动强度和特点,开展线路、桥梁、路基、地质和轨道多专业专题研究,采取相应措施对无砟轨道和下部基础结构进行特殊设计,保证线路运营期具备足够调整量。

Based on the characteristics of high speed railway crossing the active fault zone, this paper puts forward the principle for type selection of track structure, makes an analysis based on the structural characteristics of ballasted track, ballastless track and polyurethane cured ballast bed, and the adaptability of the active fault zone,and provides recommendations for type selection of track structure in the active fault zone. The study shows that ballasted tracks are preferred for lines with a design speed of 250 km/h and below;for lines with a design speed of 300 km/h and above, in order to ensure uniform structural form of ballastless track along the whole line, unitary ballastless track structure can be adopted in the range of active fault zone. In combination with the active strength and characteristics of the active fault zone, a multi-discipline special study on the line, bridge, subgrade, geology and track is carried out, and corresponding measures are taken for special design of the ballastless track and the substructure to ensure the sufficient adjustment during the operation period of the line.