On subsurface box-shaped lined tunnel under incident SH-wave propagation  

作　　者：Mehdi PANJI Saeed MOJTABAZADEH-HASANLOUEI 

机构地区：[1]Department of Civil Engineering,Zanjan Branch,Islamic Azad University,Zanjan,45156-58145,Iran

出　　处：《Frontiers of Structural and Civil Engineering》2021年第4期948-960,共13页结构与土木工程前沿（英文版）

摘　　要：In this paper,a half-plane time-domain boundary element method is applied to obtain the seismic ground response,including a subsurface box-shaped lined tunnel deployed in a linear homogenous elastic medium exposed to obliquely incident SH-waves.Only the boundary around the tunnel is required to be discretized.To prepare an appropriate model by quadratic elements,a double-node procedure is used to receive dual boundary fields at corners as well as change the direction of the normal vector.After encoding the method in a previously confirmed computer program,a numerical study is carried out to sensitize some effective parameters,including frequency content and incident wave angle for obtaining a surface response.The depth and impedance ratio of the lining are assumed to be unvaried.The responses are illustrated in the time and frequency domains as two/three-dimensional graphs.The results showed that subsurface openings with sharp corners distorted the propagation path of the anti-plane waves to achieve the critical states on the ground surface.The present approach can be proposed to civil engineers for preparing simple underground box-shaped models with angular boundaries.

关 键 词：box-lined tunnel half-plane BEM surface response SH-wave TIME-DOMAIN 

分 类 号：O34[理学—固体力学]