大型水下盾构隧道双层衬砌相互作用机理研究

项目名称： 大型水下盾构隧道双层衬砌相互作用机理研究

项目编号： No.51278424

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 王士民

作者单位： 西南交通大学

项目金额： 83万元

中文摘要： 大型水下盾构隧道日趋深埋化、超长化、大断面化以及高水压化，单层管片衬砌已难满足其对衬砌结构安全性和耐久性越来越高的要求，致使对双层衬砌的需求日益增加。然而，截至目前对于盾构隧道二次衬砌的作用在认识上仍存在偏差和争议，至今尚未形成统一的盾构隧道双层衬砌结构计算理论。本项目通过对大型水下盾构隧道双层衬砌相互作用机理问题开展系统研究，揭示大型水下盾构隧道双层衬砌结构横、纵向力学性能及累积损伤特性，探明管片衬砌与二次衬砌的相互作用机理；确定大型水下盾构隧道双层衬砌结构的使用条件和二次衬砌的最佳施做时机；揭示管片衬砌与二次衬砌之间的荷载分配规律，建立大型水下盾构隧道双层衬砌结构的实用计算方法，实现双层衬砌结构型式和设计参数的优化，进而形成完整的大型水下盾构隧道双层衬砌结构设计方法。项目研究成果将为大型水下盾构隧道双层衬砌结构设计提供理论依据和实用方法，同时可为既有盾构隧道的维护加固提供参考。

中文关键词： 盾构隧道；双层衬砌；模型试验；相互作用；荷载传递

英文摘要： As the large underwater shield tunnels with deep-buried, super-long, large cross-section and high hydraulic pressure being more and more widely used, single-layer segment lining cannot satisfy the safety and durability any more, which results in the increasing demand of double-layer lining. At present, there is a controversy over the role of the shield tunnel secondary lining and a unified structure calculation theory on the double-layer lining used in shield tunnels has not yet formed. This project is proposed to conduct the systemic researches on the interaction mechanism between double layer linings of large underwater shield tunnels. The transverse and longitudinal mechanical properties and the accumulated damage characteristics about the large underwater shield tunnel double-layer lining are revealed. Then the interaction mechanism between double layer linings of large underwater shield tunnels is explored. The application conditions of the large underwater shield tunnel double-layer lining and the best time to carry out of the secondary lining are determined. The load distribution between the segment lining and the secondary lining is revealed. Finally the practical calculation method of the large underwater shield tunnel double-layer lining structure is established and the most optimal structure types and

英文关键词： shield tunnel；double-layer lining；model test；interaction；load transfer