Analysis of Surrounding Rock Deformation in the Expansion Excavation Construction Process of Metro Interval Tunnel with Connecting Passage into Forming New Station
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 4
Abstract
Objective The Cruise Home Port Station on Chongqing Rail Transit Line 9 is constructed from in-situ expansion of the existing interval tunnel (including a connecting passage). Due to the complex geological conditions, the initial stress field of surrounding rock, and the structure of the existing interval tunnel, analysis and research of the complex mechanical behavior of the interval tunnel during construction is essential to ensure engineering safety. Method After outlining the overview of the excavation project, a three-dimensional finite element numerical model, utilizing an anisotropic jointed rock mass elastoplastic model, is established. The model geometric features, geological characteristics, structural features, and procedural characteristics are further determined. Three measurement lines (connecting passage centerline, left-line large-mileage interval tunnel centerline, right-line small-mileage interval tunnel centerline) are selected for analyzing land subsidence above these three lines and deformation around the left-line and right-line tunnels. Simulation values are compared with measured values to study the deformation characteristics of surrounding rock and structure during the construction process of interval tunnel expansion and excavation. Result & Conclusion The comparison of model-simulated and construction-measured results indicate that the established finite element model is reasonable. The connecting passage expansion and excavation construction leads to a significant increase in convergence deformation around the tunnel, with the maximum deformation occurring at the intersection of the existing connecting passage and the construction main tunnel. Therefore, backfilling with spoil inside the connecting passage is recommended to ensure the safety and smooth implementation of tunnel excavation construction.
Authors and Affiliations
Xiangfeng JIA, Jie GAO, Peisheng GU, Xiaolei ZOU, Guichun LIU, Xing LI
Keywords
Related Articles
- EP ID EP734172
- DOI 10.16037/j.1007-869x.2024.04.026
- Views 56
- Downloads 0
Evacuation Solution for Fully Automatic Operation System of Urban Rail Transit
Objective In order to ensure that FAO (fully automatic operation system) can effectively guarantee the safe evacuation of passengers in case of emergency and quickly resume operations after evacuation completion, it is p...
Simulation and Evaluation Model of Operation Delay Adjustment Plan for Urban Rail Transit Express and Local Trains
Objective Making a reasonable train delay adjustment plan is one of the key tasks to ensure the safe and reliable operation of urban rail transit lines. For those lines with express and local trains running on, it is nec...
Research and Application of Urban Rail Transit Train Collision Performance
［Objective］ In order to effectively reduce the hazards from the collision of urban rail transit trains and thereby improve the safety of train operation, it is necessary to conduct research on the collision performance...
Impact Analysis of Ground Traffic and Proposed Jinan Metro Line 6 on Nearby Ancient Brick-wood Structure Vibration
［Objective］ The vibration impact of ground traffic on nearby ancient buildings is becoming increasingly prominent. It is necessary to analyze the influence of ground traffic and the proposed Jinan Metro Line 6 on the v...
Stress Analysis of Large-diameter Undersea Shield Tunnel Lining Segments during Construction Process
Objective To assess the engineering safety and reliability of undersea large-diameter shield tunnel structures, it is essential to analyze the stress on lining segments. Method Taking the lining segments of Dalian Railwa...