地铁运行对沿线不同砌体结构的振动影响研究

随着地铁建设规模的不断扩大,地铁列车运行对沿线砌体结构振动影响日趋严重。针对这一问题,以某地铁线路邻近砌体结构为研究对象,建立了车辆-轨道-隧道-地层-砌体结构耦合模型,分析了砌体结构层数、墙体材料、基础材料对振动响应分布规律的影响。结果表明,墙体材料除石砌体外,均在不同层数出现振动响应放大现象,且配筋砌体最大;各种基础材料均出现振动响应放大现象,且峰值频域范围均为40~50 Hz;对于不同层数的砌体结构,水平向、垂向倍频程峰值个数略有区别,但每种层数下的最大加速度振级基本相同,均为60 dB左右。研究成果对地铁沿线砌体结构的振动控制具有指导意义。

Study on the Vibration of Different Types of Masonry Structures along the Metro Caused by Train Running

With the continuous expansion of the scale of subway construction, the impact of subway train operation on the vibration of masonry structures along the line has become increasingly serious. Aiming at this problem, the adjacent masonry structure of a certain line was taken as the research object, and the vehicle-track-tunnel-stratigraphic-masonry structure coupling model was established, and the influences of masonry structure layer, wall material and foundation material on the distribution law of vibration response were analyzed. The results show that the wall material has vibration response amplification phenomenon in different layers except stone cladding, and the reinforcement rein-forced masonry is the largest; all kinds of basic materials have vibration response amplification phenomenon, and the peak frequency range is 40~50 Hz; for different layers of masonry structure, the horizontal and vertical octave peaks are slightly different, but the maximum acceleration vibration level under each layer is basically the same, both about 60 dB. The research results have guiding significance for the vibration control of masonry structures along the subway.