Back Analysis for Cross Section of Caves and Optimization Design for Lining in Zipingpu Project

Through the study on the transmutation of cross section of the 2~# lead-flow cave and flood discharge tunnel in Zipingpu project,and through the back analysis of displacement of the construction process for the typical section 0+232.0,the real mechanics parameters agreeable to the actual circumstances are gotten,and then the optimization design about lining and the judge of safety and stability about surrounding rock are made.All these offer an effective and applicable method for the optimization design and safety construction.