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随着地铁和城际高铁等城市公共交通的迅速发展,有关车辆-隧道体系的动力相互作用和有关围岩条件与结构系统的关系研究日显重要。本文首先将轨道/隧道作为参振子结构纳入车辆计算模型,考虑车-隧体系耦合动力作用,建立了车-隧耦合动力分析模型。在此基础上,主要从能反映车辆运行品质和隧道/轨道结构设计参数或动力特性的一些主要指标入手(比如车体竖向振动加速度、车辆动轮重、轮重减载率、钢轨的竖向位移、隧道围岩顶部的竖向位移和竖向应力等),探讨了模型分析、单元类型、指标确定等问题,研究分析了不同围岩级别对系统动力特性的影响。分析表明:只要隧道结构/轨道结构设计合理,车辆选型合理并在一定的车速范围内,各类围岩条件均能满足车-隧系统的动力特性要求。但综合各项指标的设计标准,Ⅲ级围岩各项指标相对较优。
With the rapid development of public transport such as metro and inter-city high-speed rail, it is very important to study the dynamic interaction of vehicle-tunnel system and the relationship between surrounding rock conditions and structural system. In this paper, the track / tunnel is taken as the parametric substructure into the vehicle computing model. Considering the coupling of the vehicle-tunnel system, a dynamic analysis model of the vehicle-tunnel coupling is established. On this basis, the paper mainly starts with some main indexes that can reflect the running quality of the vehicle and the design parameters or dynamic characteristics of the tunnel / track structure (such as the vertical vibration acceleration of the vehicle body, the weight of the moving wheels of the vehicle, the wheel load reduction rate, the vertical Displacement, vertical displacement and vertical stress at the top of tunnel surrounding rock, etc.), The model analysis, unit type and index determination are discussed. The influence of different surrounding rock grades on the system dynamic characteristics is studied. The analysis shows that all kinds of surrounding rock conditions can meet the dynamic characteristics of the car-tunnel system as long as the design of the tunnel structure / track structure is reasonable, the vehicle selection is reasonable and within a certain speed range. However, based on the design criteria of each indicator, the indicators of grade Ⅲ surrounding rock are relatively better.