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运用FLAC3D软件采用动力有限元法对高地震烈度下超大直径海底隧道地震响应影响因素进行分析。通过分析得出如下结论:1)隧道变形形态受地震波入射方向影响较大,地下结构抗震不能忽略竖向地震荷载而仅考虑水平地震荷载;2)随着管片厚度的增大,其轴力、剪力和弯矩都增大,在满足结构受力的前提下,降低管片厚度有利于提高结构的抗震性;3)随着管片刚度的增加,相同部位的受力逐渐增加,通过增大管片刚度来提高结构的抗震性,效果不明显;4)随着隧道埋深的增加,管片结构的地震反应也在增加,埋深对结构的位移影响较大,深埋时能减小地震作用下结构位移。
Using FLAC3D software, the dynamic finite element method is used to analyze the influencing factors of seismic response of large diameter tunnel under high seismic intensity. The conclusions drawn from the analysis are as follows: 1) The deformation of the tunnel is greatly affected by the incident direction of the seismic wave. The vertical seismic load can not be neglected in the underground structure but only the horizontal seismic load. 2) As the thickness of the pipe increases, , The shear force and bending moment are both increased. Under the premise of meeting the stress of the structure, reducing the thickness of the segment is beneficial to improve the seismic performance of the structure. 3) With the increase of the segment stiffness, the force of the same segment gradually increases, Increasing the stiffness of the segment to improve the seismic performance of the structure, the effect is not obvious; 4) With the increase of the tunnel depth, the seismic response of the segment structure is also increasing, and the depth of the influence has a greater impact on the displacement of the structure. Reduce the structural displacement under the earthquake.