SV波斜入射下海底沉管隧道地震响应研究  

Seismic Response of a Submarine Immersed Tunnel Under Oblique Incidence of SV Waves

作　　者：黄伟真 何聪 徐国元[1] 李百建[1] HUANG Weizhen;HE Cong;XU Guoyuan;LI Baijian(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,Guangdong,China;Guangzhou Municipal Engineering Group Co.,Ltd.,Guangzhou 510060,Guangdong,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]广州市市政集团有限公司,广东广州510060 [3]同济大学土木工程学院,上海200092

出　　处：《隧道建设（中英文）》2024年第4期724-738,共15页Tunnel Construction

基　　金：国家自然科学基金(52108142)。

摘　　要：为避免近场斜入射地震波对海底沉管隧道造成灾难性后果,对沉管隧道及其剪力键在斜入射地震作用下的动力响应规律进行深入研究。首先,基于时域有限元方法并结合黏弹性人工边界,将地震波转换为模型边界节点的等效节点力,建立基于波动理论的三维平面SV波斜入射方法,并采用半空间算例验证该方法的准确性;然后,在该地震波输入方法的基础上,利用ABAQUS软件建立土体-沉管隧道节段三维精细化有限元模型,研究地震SV波斜入射作用下不同入射角度对沉管隧道及其剪力键动力响应的影响。研究结果表明:1)当SV波入射角接近临界角时,斜入射对隧道竖向和纵向响应达到最大值,水平响应与入射角呈反比关系;2)斜入射会使结构中对称部位产生非对称剪力,剪力键的剪力承担比也发生改变;3)剪力键根部易产生拉伸裂缝,端角也可能因应力集中而产生局部破坏。The near-field oblique incident seismic waves might cause a catastrophe in submarine immersed tunnels.Thus,examining the dynamic response patterns of immersed tunnels and their shear keys under oblique incident earthquakes is imperative.First,the seismic wave is converted into the equivalent node force of the model boundary node based on the finite element method and the viscoelastic artificial boundary.This process establishes the three-dimensional plane SV wave oblique incidence method based on wave theory and validates its accuracy through a half-space example.Then,based on the seismic wave input method,a three-dimensional refined finite element model of a soil-immersed tunnel is established using ABAQUS software.The influence of different SV wave incident angles on the dynamic response of an immersed tunnel and its shear key is studied.The results indicate the following:(1)When the incident angle of the SV wave is close to the critical value,the vertical and longitudinal responses of the tunnel reach the maximum.The horizontal response is inversely proportional to the incident angle.(2)The oblique incidence will cause asymmetric shear force in the symmetrical parts of the structure,changing the shear-bearing ratio of the shear keys.(3)The root of the shear key is prone to tensile cracks,and the end angle might cause local damage due to compressive stress concentrations.

关 键 词：SV波斜入射 入射角度 海底沉管隧道 土体-沉管隧道系统 剪力键 地震响应 

分 类 号：U459[建筑科学—桥梁与隧道工程]