盾构管片接头简化数值模拟方法_葛世平.pdf

TU 94.2 A 2013 (1964 )E-mail: geshiping@ Simplified numerical simulation method for segment joints of shield tunnels 1, 2, 3 4 1, 2 5 GE Shi-ping , XIE Dong-wu , DING Wen-qi , OUYANG Wen-biao (1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China; 3. Shanghai Shentong Metro Construction Group Co., Ltd., Shanghai 201103, China; 4. Shanghai Tunnel Engineering Rail Transit Design and Research Institute, Shanghai 200235, China; 5. Shanghai Urban Construction Design Research Institute, Shanghai 200125, China) Abstract: The distribution of the lining stiffness of shield tunnels is uneven for the lining structure composed of several segments and joints, and the weak links are at the segment joints. The correct determination of the segment joint stiffness is crucial for the simulation of construction process of the shield tunnels, the determination of the surface settlement trough and the accurate estimation of ground loss. A simplified method, district modified stiffness method (DMSM), is proposed for simulating segment joints based on the stress and structure of segment joints, which corrects the stiffness at the place of joints and the nearby areas and maintains the stiffness of the rest segment regions. A formula for determing the segment joint stiffness is deduced, and a method for determing the relevant parameters is proposed based on the Saint-Venant principle and the variable stiffness beam theory. The numerical simulation and comparable analysis of deformations of segment joints caused by positive and n