A calculation model of flexural bearing capacity of segmental joint for shield tunnels
Xiao Mingqing1，2 Feng Kun1 Zhang Li1 He Chuan1
1. Key Laboratory of Transportation Tunnel Engineering of the Ministry of Education，Southwest Jiaotong University，Chengdu 610031，China；
2. China Railway Siyuan Survey and Design Group Co，Ltd，Wuhan 430063，China
Abstract： The calculation of the bearing capacity of segmental joints of shield tunnel is an important and key part of segment design and its service performance evaluation，and it is necessary to propose the calculation methods for segmental joints with the same form and different detailed structuresIn this work，the imperfection of the joint surface is considered and the joint surface is properly partitioned，and then a mechanical model for the calculation of bearing capacity of segmental joints is established and corresponding solution algorithm is designedThe fullscale joint tests are carried out to verify the correctness of the theoretical model，and the joint test results are in good agreement with the analytical results，indicating that the model is valid and has high calculation accuracyFurthermore，the bearing capacity of segmental joints is analyzed and discussed by using the calculation modelThe results show that the joint bearing capacity curve has obvious nonlinear characteristics，and as the axial force increases，the ultimate bending moment of the joint increases firstly and then decreasesThe influence of concrete strength on the bearing capacity of the joint is significant，and the influence degrees of the bolt strength and bolt diameter on the bearing capacity of the joint depend on the magnitude of the axial forceWhen the axial force is small，the increases in the above two parameters significantly improve the bearing capacity，but as the axial force increases，the improvement effect gradually diminishesThe mechanical model and related results can provide important references for the design，test，and performance evaluation of shield tunnels.
肖明清 封坤 张力 何川. 盾构隧道管片接头抗弯承载力计算模型研究[J]. 土木工程学报, 2019, 52(11): 108-119.
Xiao Mingqing Feng Kun Zhang Li He Chuan. A calculation model of flexural bearing capacity of segmental joint for shield tunnels. 土木工程学报, 2019, 52(11): 108-119.
