海底隧道强震动力响应及其极限状态研究  

Study on Dynamic Response and Limited States for Undersea Tunnel under Strong Seismic Loading

作　　者：李秀地[1] 耿振刚[1] 郑颖人[1,2] 辛建平[1] Li Xiu-di;Geng Zhen-gang;Zheng Ying-ren;Xin Jian-ping(Dept. of Civil Engineering;Chongqing Engineering and Technology Research Center of Geological Hazard Prevention and Treatment,Chongqing 401311,China)

机构地区：[1]后勤工程学院军事土木工程系,重庆401311 [2]后勤工程学院重庆市地质灾害防治工程技术研究中心,重庆401311

出　　处：《后勤工程学院学报》2016年第4期1-6,共6页Journal of Logistical Engineering University

基　　金：国家自然科学基金项目(51378496)

摘　　要：以某海底沉管隧道为例,利用强度折减法对沉管隧道在强震作用下的动力响应进行分析,采用钢筋混凝土等效模型,以极限应变值分析沉管隧道的整体破坏极限状态。研究结果表明:水平地震荷载作用下,由于受到周围土层的约束作用,沉管水平向位移变化不大;但在地震、海水及淤泥等荷载的共同作用下,沉管顶板两端的素混凝土单元将产生拉伸、剪切破坏,钢筋混凝土等效单元产生剪切破坏。此外,还得到了强震作用下海底沉管隧道的整体破坏极限状态及其相应的安全系数。研究成果可为海底隧道抗震设计提供参考。Taking an undersea immersed tunnel as an example, the strength reduction method was used to study the dynamicresponse and limited failure states of the immersed tunnel with an equal model of steel enforced concrete under strong seismic loading.The simulation results showed that the change of the horizontal displace of the immersed tunnel with the reduction factor was little becauseof the confining effect of the surrounding soil. But the shear failure and the tensile failure for plain concrete and the shear failure for steelenforced concrete near the intersection between the roof slab and the two lateral walls would occur under the strong seismic, seawaterand silt loading together. The limited failure state and the safety factor of the immersed tunnel under strong seismic loading were obtainedby the strength reduction method. It can provide a certain reference for aseismic design of undersea tunnels.

关 键 词：海底隧道 强震 强度折减 极限状态 

分 类 号：U459.5[建筑科学—桥梁与隧道工程]