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Subway-Induced Vibration Measurement and Evaluation of the Structure on a Construction Site at Curved Section of Metro Line

机译：地铁弯段施工现场地铁振动测量与结构评估

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Metro property buildings developed rapidly in metropolitan cities over last several years in China. The subway-induced vibration, which may influence the serviceability of the buildings and the comfortability of their occupants over or near the metro lines, has been paid more and more attention by professional and academic experts. Based on the vibration measurement data of a construction site over Shenzhen Metro line No. 1, this paper utilizes the reasonable and completed data processing method to handle and analyse the measured data. Through the analysis of the data, the subway-induced vibration propagation trend of free field along the perpendicular direction to metro line was investigated. It is demonstrated that the subway-induced vibration propagation along the perpendicular direction to metro line was damped out on free field as a whole. But there may exist “rebound phenomenon” at local zones. The responses on pile top and soil adjacent to pile in the vertical shaft along three directions were investigated, and their characteristics in time and frequency domains are compared. Comparison indicates that the subway-induced vibration on pile top is stronger than soil site near the pile. The measurement results on free field reveal that the most obvious feature of this metro line with curved section is that the vibration along the perpendicular direction is stronger than the other directions. But the measurement results in the vertical shaft show that the vertical vibration mainly transferring through the pile and pile’s vibration in the vertical direction is dominant. Finally, the dynamic time-history analysis of the building model under the measured acceleration was conducted. The analytical results show that the vibration response of two evaluation indicators increases with the decrease of damping ratio along all three directions. The vertical vibration is more dominant than other two directions at each floor of building. The vibration levels decrease with the increase of story number along vertical direction and firstly decrease and then increase with the increase of story number increasing along two lateral directions.
机译：在过去的几年中，中国大都市城市的地铁物业建筑发展迅速。地铁引起的振动可能会影响建筑物的可使用性及其在地铁线路上方或附近的居住者的舒适度，这已引起专业和学术专家的越来越多的关注。本文基于深圳地铁一号线某建筑工地的振动测量数据，利用合理，完善的数据处理方法对测量数据进行处理和分析。通过数据分析，研究了地铁引起的自由场沿垂直于地铁线垂直方向的振动传播趋势。结果表明，地铁沿垂直于地铁线的方向上的振动传播在整个自由场上被衰减。但是在本地区域可能存在“反弹现象”。研究了竖井沿三个方向对桩顶和邻近桩土的响应，并比较了它们在时域和频域的特性。比较表明，地铁在桩顶的振动要比桩附近的土壤强。在自由场上的测量结果表明，这条具有弯曲截面的地铁线最明显的特征是沿垂直方向的振动比其他方向的振动强。但是在竖井中的测量结果表明，竖向振动主要通过桩传递，而竖向的振动是主要的。最后，在测得的加速度下进行了建筑模型的动态时程分析。分析结果表明，两个评价指标的振动响应都随着阻尼比的减小而沿三个方向增加。在建筑物的每个楼层，垂直振动比其他两个方向更占优势。振动水平随着层数在垂直方向上的增加而减小，然后随着层数在两个横向方向上的增加而减小然后增加。

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