【摘要】 地铁兰州西站位于地下商场下方,是一典型地下多层岛侧式交叠式换乘站。利用ANSYS软件建立车站三维有限元模型,对比不同工况下地下商场楼板振动规律,发现商场楼板振动加速度受交汇列车时差的影响在20%以内,且主要受浅层线路影响。当土层密度和剪切波速减小时,该规律更显著。楼板加速度随振中距离增加而逐渐衰减,但在一定距离处出现振动放大区。因此,建筑布局时应避免将休息区布置在线路上方及振动放大区。对浅层线路采取隔振降噪措施效果优于深层线路。更多还原

【Abstract】 Built in the underground commercial square,West Lanzhou Metro Station is a typical overlapping transition station featuring multilayer island- lateral sided style.A complex 3D dynamic finite element( FE) model is presented by ANSYS FE software to simulate the dynamic responses of the square floor.By comparing and analyzing 6 different typical train load cases,it is concluded that the vibration acceleration differences caused by train intersection times is within 20% and the acceleration of the square floor vibration is largely affected by the shallow buried lines.Specifically,this law is more obvious in soil with less density and lower shear wave velocity,and the dynamic responses attenuate with the increase of the horizontal distance from the vibration source.However,a vibration amplifying area will emerge within a certain horizontal distance,thus the lounge should not be laid out over the metro lines or over the vibration amplifying area,it is more effective to reduce the vibration of the floor by taking measures on the shallow buried lines.更多还原