Calculation and Analysis of Pipe Joint Settlement Control in Large Back Silting Immersed Tube Tunnel

Li, Zhijun; Yue, Xiabing; Wu, Guanqing

doi:10.3390/su15097446

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…Moreover, the mechanical behavior of longitudinal joints is highly nonlinear, mainly divided into the following three stages: the elastic stage; in which concrete is partially plastic while steel bolts remain elastic; the plastic stage; and the outer concrete contact stage [1]. In the past few decades, scholars have studied the structural performance of joints through numerical simulations [2][3][4], experimental methods [5][6][7][8], and analytical approaches [9]. Among them, numerical simulation methods are widely used due to their strong applicability and low cost, but determining parameters remains a key and challenging aspect of numerical simulation methods.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study Considering Discontinuous Longitudinal Joints in Soft Soil under Symmetric Loading

He,

Xu,

Yang

2024

Symmetry

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In shield tunneling, the joint is one of the most vulnerable parts of the segmental lining. Opening of the joint reduces the overall stiffness of the ring, leading to structural damage and issues such as water leakage. Currently, the Winkler method is commonly used to calculate structural deformation, simplifying the interaction between segments and soil as radial and tangential Winkler springs. However, when introducing connection springs or reduction factors to simulate the joint stiffness of segments, the challenge lies in determining the reduction coefficient and the stiffness of the springs. Currently, the hyperstatic reflection method cannot simulate the discontinuity effect at the connection of the tunnel segments, while the state space method overlooks the nonlinear interaction between the tunnel and the soil. Therefore, this paper proposes a numerical simulation method considering the interaction between the tunnel and the soil, which is subjected to compression rather than tension, and the discontinuity of the joints between the segments. The model structure and external load are symmetrical, resulting in symmetrical calculation results. This method is based on the soft soil layers and shield tunnel structures of the Shanghai Metro, and the applicability of the model is verified through deformation calculations using three-dimensional laser scanning point clouds of sections from the Shanghai Metro Line 5. When the subgrade reaction coefficient is 5000 kN/m3, the model can effectively simulate the deformation of operational tunnels. By adjusting the bending stiffness of individual connection springs, we investigate the influence of bending stiffness reduction on the bending moment, radial displacement, and rotational displacement of the ring. The results indicate that a decrease in joint bending stiffness significantly affects the mechanical response of the ring, and the extent and degree of this influence are correlated with the joint position and the magnitude of joint bending stiffness.

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