中文摘要：

采用弹塑性渗流-应力耦合有限单元法,对某大型输水隧洞TBM开挖过程进行了数值仿真计算与分析。计算中采用围岩应力释放技术,考虑开挖预留变形的影响,重点考虑了水头压力变化对围岩与管片受力与变形的影响。结果表明开挖过程中渗流场的变化将引起围岩较大的变形和管片受力的增加;预留变形的设计增加开挖量和围岩变形量,但可降低管片受力,有利于管片的受力和稳定。

英文摘要：

The elastic-plastic seepage and stress coupling FEM were adopted for numerical simulation calculation and analysis on a large diversion tunnel＇s excavating by TBM.The calculation on rock stress release technology and consideration on the influence of excavating reservation deformation,especially the influence of water pressure change on surrounding rock and segment＇s stress and deformation are included in the study.The results showed that the change of seepage field would lead to a larger deformation of surrounding rock and stress increase of segment.The design of reservation deformation increased the excavation volume and surrounding rock＇s deformation,however,reduced the segment＇s stress,which was good for segment＇s stress distribution and stability.