The control measures of stress relaxation of segment after #br#
underwater shield junction and dismantling
Geng Zhe1,2 Yuan Dajun1,2 Wang Teng1,2
1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
2. Tunnel and Underground Engineering Reseach Center of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
Abstract：The technology of shield junction is more and more frequently used in the construction of underwater shield tunnel. As the technology is not perfect, the instability of the tunnel face and the stress relaxation of segment lining caused by shield machine dismantling need to be solved. Based on a subsea tunnel project, the technology of reinforcing segment with channel steel in the process of shield junction is studied. The shell-connector model of segment lining is established. By reserving the gap between the rings, the simulation of the ring gap between the segments is realized. The connection strength between the segments and the rings is calculated, which can simulate the width of the circular gap under different loads in detail. The influence of reinforcement range, channel steel quantity and channel steel type on reinforcement effect is analyzed. The results show that: With the increase of the number of strengthening rings, the maximum axial displacement and the width of the ring joint decrease first and then increase; With the increase of the number and type of channel steel, the maximum axial displacement and the width of ring joint gradually decrease, and the decreasing trend gradually slows down.
耿哲 袁大军 王滕. 水下盾构对接拆机后管片应力松弛控制措施研究[J]. 土木工程学报, 2020, 53(S1): 155-161.
Geng Zhe Yuan Dajun Wang Teng. The control measures of stress relaxation of segment after #br#
underwater shield junction and dismantling. 土木工程学报, 2020, 53(S1): 155-161.
