Analytical algorithms of compressive bending capacity of bolted circumferential joint in metro shield tunnels  

作　　者：Xiaojing GAO Pengfei LI Mingju ZHANG Haifeng WANG Zenghui LIU Ziqi JIA 

机构地区：[1]Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing,100124,China [2]Nantong Railway Construction Component Co.,Ltd.,Nantong,226000,China

出　　处：《Frontiers of Structural and Civil Engineering》2023年第6期901-914,共14页结构与土木工程前沿（英文版）

基　　金：This study was supported by the National Natural Science Foundation of China (Grant Nos. 51978019 and 52278382);the Natural Science Foundation of Beijing Municipality (No. 8222004).

摘　　要：The integrity and bearing capacity of segment joints in shield tunnels are associated closely with the mechanical properties of the joints.This study focuses on the mechanical characteristics and mechanism of a bolted circumferential joint during the entire bearing process.Simplified analytical algorithms for four stress stages are established to describe the bearing behaviors of the joint under a compressive bending load.A height adjustment coefficient,α,for the outer concrete compression zone is introduced into a simplified analytical model.Factors affectingαare determined,and the degree of influence of these factors is investigated via orthogonal numerical simulations.The numerical results show thatαcan be specified as approximately 0.2 for most metro shield tunnels in China.Subsequently,a case study is performed to verify the rationality of the simplified theoretical analysis for the segment joint via numerical simulations and experiments.Using the proposed simplified analytical algorithms,a parametric investigation is conducted to discuss the factors affecting the ultimate compressive bending capacity of the joint.The method for optimizing the joint flexural stiffness is clarified.The results of this study can provide a theoretical basis for optimizing the design and prediciting the damage of bolted segment joints in shield tunnels.

关 键 词：shield tunnel segment joint joint structural model failure mechanism 

分 类 号：U45[建筑科学—桥梁与隧道工程]