大断面海底隧道初期支护变异对二次衬砌安全性的影响  

Influence of Primary Support Deterioration on the Security of Secondary Lining for a Large Cross-section Subsea Tunnel

作　　者：李海军[1] 王明年[2] 赵海东[3] 余大龙[3] 

机构地区：[1]中铁二院工程集团有限责任公司重庆设计研究院,重庆400015 [2]西南交通大学土木工程学院,成都610031 [3]中铁二院工程集团有限责任公司,成都610031

出　　处：《现代隧道技术》2009年第4期7-11,18,共6页Modern Tunnelling Technology

基　　金：国家863资助项目(编号2006AA11Z116)

摘　　要：运用大型有限元通用软件ANSYS和钢拱架与混凝土间的粘结滑移退化模型,分析了海底隧道典型初期支护裂缝及钢拱架锈蚀对二次衬砌安全性的影响规律。相对于未开裂前,拱顶开裂造成二次衬砌边墙安全系数最大降幅达5.0%,拱腰开裂造成未开裂侧二次衬砌边墙安全系数最大降幅达15.6%;初期支护承受全部围岩荷载时,钢拱架锈蚀对二次衬砌拱顶安全系数的影响最大,80%锈蚀率时拱顶安全系数降幅为10.0%左右。The influence of typical cracks of primary support and steel arch corrosion on the security of secondary lining of subsea tunnel was analyzed by using engineering software ANSYS and a bond-slip and bond degradation model between steel arch and concrete. Compared with the case of no cracks, safety factor of side- wall of the secondary lining dropped by 5.5% for crown cracks, while safety factor of opposite sidewall of secondary lining dropped by 15.6% for wall cracks. If primary support undertakes all surrounding rock load, the influence of steel arch corrosion on safety factor of secondary lining crown will be most serious, and the safety factor will have a 10.0% drop when the steel arch corrosion rate is up to 80%.

关 键 词：海底隧道 初期支护裂缝 钢拱架锈蚀 二次衬砌安全性 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]