School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, 330013, Jiangxi, China.
Environ Sci Pollut Res Int. 2021 Aug;28(30):41407-41422. doi: 10.1007/s11356-021-13599-x. Epub 2021 Mar 30.
In order to improve the utilization rate of expensive and very limited urban land, a new structure system, underground metro depot, has been developed and applied in several cities in China. The underground metro depot, which is built underground, can be multiple stories, and allows other developments on top, has become increasingly popular in recent years. Since there are other developments on top, the vibration induced by the trains frequently entering and exiting the depot cannot be ignored. To better understand the characteristics of the train-induced vibration in the underground metro depot, a series of field tests were conducted on a two-story underground depot which is the largest underground metro depot in Asia. The results show that the main frequency components of vibration source are between 50 and 200 Hz and the level of that in the first floor underground is larger than that in the second floor underground due to the train floor structure interaction when the train running on the first floor underground. The vibration in the top platform decreases linearly with the distance from the measuring point to the center line of the track. When the train is running on the track at the edge area, the linear attenuation rate was about 0.2dB/m. It is easy to excite the vibration mode of the floor structure when the train is running on the first floor underground, so the vibration in the top platform induced by the train running on the first floor underground was much larger than the train running on the second floor underground. In the future design, if the underground depot has more than one floor, the structural dynamic behavior of over-track buildings induced by the train running on the floor slab underground should be the focus. The throat area has many rail joints and turnouts which can lead to a larger vibration level, the level easy to exceed the limit given for human vibration comfort. If developments are proposed on top of the throat area, the vibration level should be carefully checked in the area within 30 m from the track to avoid potential later vibration problem.
为了提高昂贵且非常有限的城市土地的利用率，一种新的结构系统——地下地铁车库，已经在中国的几个城市得到开发和应用。近年来，建在地下的多层地下地铁车库，其上方允许进行其他开发，变得越来越受欢迎。由于上方有其他开发，因此频繁进出车库的列车引起的振动不容忽视。为了更好地了解地下地铁车库中列车引起的振动特性，对亚洲最大的地下两层地铁车库进行了一系列现场测试。结果表明，振动源的主要频率分量在 50 到 200Hz 之间，由于列车在地下一层运行时的列车地板结构相互作用，地下一层的振动水平大于地下二层的振动水平。顶层平台的振动随距轨道中心线测量点的距离线性减小。当列车在边缘区域的轨道上运行时，线性衰减率约为 0.2dB/m。当列车在地下一层运行时，很容易激发出地板结构的振动模式，因此，列车在地下一层运行时引起的顶层平台振动比列车在地下二层运行时大得多。在未来的设计中，如果地下车库有超过一层，应重点关注列车在地下板层运行时对过轨建筑物的结构动力行为。咽喉区有许多轨节和道岔，会导致更大的振动水平，容易超过人体振动舒适度限值。如果在咽喉区上方进行开发，应在距轨道 30m 范围内仔细检查该区域的振动水平，以避免潜在的后期振动问题。
