Abstract To address the limitations of engineering analogy, physical tests, and numerical simulations in the bending stiffness acquisition and performance study of deep-buried, large-section, and irregular-shaped shield tunnel joints, this paper establishes a virtual joint test method and platform based on independent cover isogeometric shell models. The study discusses the key theories, algorithms and techniques to realize the virtual tests, analyzes the feasibility and advantages of virtual tests against physical tests, and uses virtual tests to analyze the joint bending resistance of a large-section deep-buried tunnel and its influencing factors. The results show that joint bending resistance curves that match physical tests can be obtained by inputting non-sensitive parameters in the virtual test platform, and the computation cost is only about 0.75% of the solid finite element model. Within the range of the study,the joint stiffness of large-section deep-buried tunnels is valued in the range of 2.98×105~2.57×106 kN·m/rad, and the joint stiffness decreases significantly with the increase of the deformation joint length of the segment.
Abstract：
To address the limitations of engineering analogy, physical tests, and numerical simulations in the bending stiffness acquisition and performance study of deep-buried, large-section, and irregular-shaped shield tunnel joints, this paper establishes a virtual joint test method and platform based on independent cover isogeometric shell models. The study discusses the key theories, algorithms and techniques to realize the virtual tests, analyzes the feasibility and advantages of virtual tests against physical tests, and uses virtual tests to analyze the joint bending resistance of a large-section deep-buried tunnel and its influencing factors. The results show that joint bending resistance curves that match physical tests can be obtained by inputting non-sensitive parameters in the virtual test platform, and the computation cost is only about 0.75% of the solid finite element model. Within the range of the study,the joint stiffness of large-section deep-buried tunnels is valued in the range of 2.98×105~2.57×106 kN·m/rad, and the joint stiffness decreases significantly with the increase of the deformation joint length of the segment.
CHEN Jingxu CAI Yongchang
.Research on Virtual Joint Test Method of Shield Tunnels Based on Independent Cover Isogeometric Shell Model[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(2): 22-27
2023, Vol. 60 