为解决土-无柱大跨地铁车站抗震性能的问题,以南宁地铁5 号线金桥站工程为研究对象进行振动台试验研究,验证土-地 铁车站振动台试验的边界效应,并对比分析地震作用下结构模型与土体的加速度响应规律。结果表明: 1)模型箱箱壁所设置的聚 苯乙烯泡沫板边界能消除边界上波的反射与散射,其效果比较理想; 2)对于模型地基,其加速度响应随着埋深而减小; 3)水平向地 震作用下,地铁车站结构模型各处的峰值加速度响应表现为底板最小、中板居中、顶板最大,而竖向地震作用下底板的峰值加速度 响应大于中板。震害观测表明: 模型地基发生局部破坏,车站结构模型在顶板与侧墙处、中板加腋处产生较多细微裂纹。

The seismic performance of soil-column-free large-span metro station is of great significance. Hence, vibration platform test is carried out on Jinqiao Station of Nanning Metro Line No. 5. The boundary effect of soil-metro station vibration platform test is verified and the acceleration response laws of structure model and the soil under the action of earthquake are analyzed. The results show that: (1) The boundary of the polystyrene foam board on the model box wall can eliminate the reflection and scattering of the waves on the boundary, whose effect is good. (2) As for the model foundation, the acceleration response decreases with the increase of burial depth. (3) Under the action of horizontal seismic, the peak acceleration response of the roof is the largest, followed by that of intermediate plate, and that of the floor is the smallest. The seismic damage observation shows that the foundation of the model is partially damaged, and there are many micro-cracks in the roof and side wall and connection of intermediate plate of the station structural model.