摘要
沉管隧道是连接海域和陆域的交通枢纽,对我国经济和社会发展的推动作用巨大,其地震安全性至关重要。根据三维黏弹性边界基本理论,基于黏弹性边界的等效荷载理论和输入方法,探讨了地震波斜入射时等效荷载的实现方法,并通过算例验证了地震波斜入射时等效荷载输入方法的合理性。在此基础上以大连湾海底沉管隧道为工程背景,建立三维土层及沉管隧道衬砌结构相互作用模型,对海底沉管隧道结构展开地震P波斜入射时隧道结构的三维地震响应分析。在研究中分析了地震波入射角度变化时海底沉管隧道衬砌监测点的位移时程以及沉管隧道衬砌内力等地震响应规律,得出沉管隧道衬砌顶板相对于底板要承受更多的地震影响;交接部位在不同角度地震波入射时为相对薄弱部位等结论。本文研究成果可为类似的沉管隧道抗震设计提供借鉴和参考。
Immersed tunnel is more and more used as an important means of transportation across the river and sea in China,which must meet the seismic safety.According to the basic theory of three-dimensional viscoelastic boundary,equivalent load theory and input method based on viscoelastic boundary,this paper discusses the realization method of equivalent load when seismic wave is incident obliquely,and verifies the rationality of equivalent load input method when seismic wave is incident obliquely.On this basis,taking Dalian Bay Subsea immersed tube tunnel as the engineering background,the interaction model of three-dimensional soil layer and the lining structure of the immersed tube tunnel is established,and the three-dimensional seismic response analysis of the tunnel structure under the oblique incidence of seismic P wave is carried out.In the research,the displacement time history of the monitoring point of the submarine immersed tunnel lining and the internal force of the immersed tunnel lining are analyzed when the incident angle of the seismic wave changes,and the conclusion is that the roof of the immersed tunnel lining bears more seismic influence than the floor;the joint part is relatively weak when the incident angle of the seismic wave is different.The research results of this paper can be used for reference in similar aseismic design of immersed tunnel.
作者
赵杰
兰雯竣
滕文强
甘长江
ZHAO Jie;LAN Wenjun;TENG Wenqiang;GAN Changjiang(R&D Center of the Civil Engineering Technology,Dalian University,Dalian 116622,China;China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,China)
出处
《结构工程师》
2021年第3期73-81,共9页
Structural Engineers
基金
国家自然科学基金重点项目(51738010)
国家自然科学基金面上项目(51678100)
辽宁省自然科学基金指导计划(20170540043)。
关键词
沉管隧道
斜入射
地震响应
黏弹性边界
等效荷载
Immersed tunnel
oblique incidence
seismic response
viscoelastic boundary
equivalent load
