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利用FLAC3D对地震荷载作用下某隧道衬砌在不同埋深情况下的位移、振动速度变化特征及规律进行了详细的动力分析,结果表明:(1)在地震荷载作用下,公路隧道衬砌拱顶与拱底竖向位移及竖向振动速度响应随埋深增大而增加,因此,在底部受地震荷载作用下隧道浅部的竖向位移响应小于深部;(2)在地震荷载作用下,公路隧道衬砌拱顶与拱底水平位移及水平方向振动速度响应随埋深增大而减小。
FLAC3D is used to analyze the dynamic characteristics of displacement and vibration velocity of a tunnel lining with different depth under seismic load. The results show that: (1) Under the action of seismic load, The response of vertical displacement and vertical vibration of the bottom of the arch increases with the increase of the buried depth. Therefore, the vertical displacement response of the shallow part of the tunnel under the seismic load at the bottom is less than that of the deep part. (2) Under the action of seismic load, The response of horizontal displacement and horizontal vibration velocity of lining dome and arch decreases with the increase of buried depth.