地铁区间正线下穿轨道交通运营指挥中心环境振动影响及对策

Structure vibration analysis and solutions of an operation control center caused by metro main line transit

通过实际工程案例,分析地铁区间正线行车引起的环境振动对其所在场区内拟建地面建筑物的影响,针对轨道交通运营指挥中心特定建筑使用功能,确定结构振动评价及控制标准,拟定桩基础和筏板基础两种结构方案,并分别进行数值模拟分析。结论表明,在不采取任何隔振、减振措施的条件下,当列车以设计时速80km/h由拟建指挥中心下方区间隧道内通过时,由于指挥中心基础与地铁区间隧道竖向距离较近,部分楼层振动将超过规范限值。通过比较可知,当指挥中心采用桩基础方案时,上部楼层对环境振动的响应将优于筏板基础方案。综合考虑施工工期、工程造价等因素,在轨道加装减振措施、设备机房敷设隔振地板的前提下,结合场区工程地质条件,本工程指挥中心最终采用筏板基础方案。

Through the actual engineering case,the impact of the environmental vibration caused by the traffic on the main line of the subway section on the proposed ground building in the site was analyzed. According to the specific building function of the rail transit operation command center,the structural vibration evaluation and control standards were determined,two structural schemes of pile foundation and raft foundation were formulated,numerical simulation analysis separately were carried out. The conclusion shows that under the condition of no vibration isolation and vibration reduction measures,when the train passes at a design speed of 80km/h from the tunnel below the proposed command center,some floor vibrations will exceed the specification limits because the vertical distance between the command center foundation and the subway tunnel is relatively close. By comparison,when the command center adopts the pile foundation scheme,the response of the upper floor to the environmental vibration will be better than the raft foundation scheme.Taking into account the construction period,project cost and other factors,under the premise of adding vibration-damping measures on the track and laying the vibration-proof floor in the equipment room,combined with the engineering geological conditions of the site,the project command center finally adopted the raft foundation plan.