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以某相对地铁线路水平距离较近的市级文物保护敏感建筑为研究对象,设线路时速70 km/h,分析地铁列车运行时产生的振动对该建筑结构的动力影响。针对整体道床和橡胶减振垫浮置板道床,建立车辆-轨道耦合模型,采用Newmark方法计算列车载荷;建立轨道-土层耦合模型,利用有限元方法分析地铁列车引起的振动在地表面的传播特性,并计算地铁列车振动对敏感建筑结构及周围环境的影响。研究结果表明:采用整体道床时,敏感点的垂向Z振级和敏感建筑结构的水平速度都大于标准值;采用橡胶减振垫浮置板道床时,敏感点的垂向Z振级和敏感建筑结构的水平速度都低于标准值;同时说明橡胶减振垫浮置板道床具有很好的减振效果。
Taking a sensitive cultural relic protection building at a city level close to the subway line as the research object, the speed of the line is 70 km / h, and the dynamic influence of the vibration caused by the subway train on the structure is analyzed. For the whole track bed and rubber vibration damper floating slab bed, the vehicle-track coupling model is established and the Newmark method is used to calculate the train load. The orbital-soil coupling model is established and the propagation of vibration caused by the subway train on the ground surface is analyzed by finite element method Characteristics, and calculate the impact of subway train vibration on the sensitive building structure and the surrounding environment. The results show that the vertical Z vibration level of sensitive points and the horizontal velocity of sensitive building structures are both larger than the standard value when the whole track bed is adopted. The vertical Z vibration level and sensitivity of sensitive points The horizontal speed of the building structure is lower than the standard value; at the same time shows that the rubber damping pad floating plate track bed has a good damping effect.