Mechanical Response Analysis of Mainline Tunnel Structures in the Full Process of Metro Shield Interval Connecting Passage Mechanical Construction
Journal Title: Urban Mass Transit - Year 2025, Vol 28, Issue 3
Abstract
［Objective］ The mechanical method construction of connecting passages significantly impacts the internal forces within the segment structures of metro mainline tunnels. It is essential to understand the force variation patterns and weak points in the tunnel structure during the construction process to ensure its safety. ［Method］ Using the mechanical method pipe jacking construction project of the connecting passage in a Zhengzhou Metro shield interval for case study, a numerical calculation model is established using ABAQUS finite element software. A simulation analysis is conducted on the entire process of connecting passage construction to investigate the deformation of the mainline tunnel structure and the change patterns of internal forces. The reliability of the numerical model is validated by comparing the trends and locations of simulated values with those of the actual measured values. ［Result & Conclusion］ The trends and locations of changes in measured and simulated values are generally consistent, confirming the accuracy of the finite element model. During construction, the maximum deformation of the cutting ring exhibits a gradually increasing trend. The maximum bending moment of the cutting ring at the originating end first increases and then decreases, while the maximum bending moment at the receiving end initially decreases slowly before increasing. The maximum axial force of the cutting ring shows a gradual increasing trend. The maximum deformation and internal force values upon completion of the passage construction are within the allowable design limits.
Authors and Affiliations
Mingfang DU, Jie ZHAO, Lingbing YI, Peng ZHANG, Zongyong WANG, Fangyi REN, Xingtong ZHU
Keywords
Related Articles
- EP ID EP760122
- DOI 10.16037/j.1007-869x.2025.03.002
- Views 24
- Downloads 0
Simplified Analytical Calculation for the Influence of Tunnel Excavation on Overlying Existing Pipelines
[Objective] When a shield tunnel passes under existing pipeline, it can cause settlement and deformation of the existing pipelines. Therefore, it is necessary to study the force and deformation of the overlying existing...
Lightning Test and Simulation Research for Medium-speed Maglev Train
Objective When medium-speed maglev trains operate on elevated tracks, the carbody is susceptible to lightning strikes. If composite materials are adopted for medium-speed maglev train carbody, damage or even penetration...
Empirical Analysis on Concentration Degree of Inbound and Outbound Passenger Volume of Guangzhou Urban Rail Transit
Objective Problems in some urban rail transit lines, such as unreasonable directions, station distribution, and transfer station layouts lead to the phenomenon of some high passenger flow stations and extremely low passe...
Detection Technology for Catenary Stagger Value Based on Acceleration Signals
［Objective］ To address the inefficiency and high operational requirements of existing detection methods for catenary stagger value in electrified railways, special research on catenary stagger value detection method is...
Mechanism Analysis and Simulation Study of Closing Overvoltage Fault in EMU Circuit Breaker
Objective The overvoltage caused by circuit breaker closing will aggravate the insulation aging of high voltage equipment when EMU (electric multiple units)passes neutral section. The research on the mechanism and influe...