橡胶支座预制浮置板轨道静动力学研究

Static and Dynamic Research on Precast Floating Slab Track with Rubber Bearing

深圳地铁6号线设计采用双向预应力橡胶支座预制浮置板轨道,为解决轨道结构设计中所存在的预制板强度与系统减振效果两个核心技术问题,建立空间实体模型和车辆-轨道-桥梁耦合动力学模型。对预制板内部配筋进行检算,以保证结构安全;对系统动力学特性进行仿真模拟,以分析系统减振效果。研究结果表明:(1)预制板结构在复杂荷载作用下,能够满足承载力极限状态和正常使用极限状态设计要求;(2)在行车速度100 km/h条件下,橡胶支座预制浮置板板系统减振效果可达10~12 dB;(3)所采用的“静动结合”的检算方法,为深圳地铁6号线轨道设计提供理论支撑。

Shenzhen Metro Line 6 is the first metro line adopting two-way precast floating slab track with rubber bearing.In order to solve the two core technical problems of the precast slab strength and the system vibration reduction effect in the design of track structure,a 3D solid model and a vehicletrack-bridge coupling dynamic model are established.Firstly,reinforcement design in the slab is checked to ensure structure safety.Then,the dynamic properties of the track system are simulated to analyze vibration reduction effect.The results show that:(1)The precast slab structure can meet the design requirements of ultimate limit state and serviceability limit state under complex loads;(2)At the traveling speed of 100 km/h,the vibration reduction of the rubber bearing precast floating slab system can reach 10~12 dB.(3)The adopted static and dynamic checking method provides theoretical support for the track design of Shenzhen Metro Line 6.