Impact of Large-span Civil Defense Tunnel Project Under-passing Construction on Structural Stability of Existing Metro Tunnel Intervals
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 4
Abstract
Objective To analyze the construction impact of new large-span civil defense tunnel on metro tunnel interval structural stability when under-passing existing metro line with a small clear distance, it is necessary to conduct a simulation study of the civil defense tunnel under-passing construction process. Method Leveraging a flat large profile civil defense tunnel under-passing existing metro tunnel interval project in Qingdao, a three-dimensional finite element model is established to simulate the whole process of civil defense tunnel excavation. The mechanical response and deformation patterns of the diaphragm wall set in the civil defense tunnel during excavation is emphatically analyzed, as well as the impact of overall construction process on existing metro station and tunnel interval. Result & Conclusion The civil defense tunnel diaphragm wall exhibits a noticeable biasing trend during the construction of both the leading and trailing holes. In the initial support phase of the civil defense tunnel, a rare ′four-quadrant′ distribution pattern is observed due to the combined effects of the existing metro tunnel upper arching effect and the diaphragm wall, with higher settlement values on the right side compared to the left side. The existing metro stations and interval structures experience a significant impact from the civil defense tunnel excavation space effect, with deformation trends moving towards the excavation side, while the deformation values are all below the regulation-specified warning limits.
Authors and Affiliations
Fenghai MA, Bo DONG, Shuai SONG, Xiumeng YANG
Keywords
Related Articles
- EP ID EP734153
- DOI 10.16037/j.1007-869x.2024.04.007
- Views 32
- Downloads 0
Design Schemes for FAO Line Intelligent Operation and Control Systems
Objective With the rapid development of technologies in urban rail transit equipment industry and the continuous maturation of their application, the automation level of urban rail transit operations is steadily increasi...
On-line Monitoring and Analysis of Urban Rail Transit Stray Current
Objective To ensure the safe operation of underground gas pipeline network near URT (urban rail transit) and to mitigate the electrochemical corrosion on the gas pipeline network caused by URT stray current, it is necess...
Dynamic Inspection Technology of Tunnel Deformation Based on Onboard LIDAR
Objective In view of the poor real-time performance, high cost and low efficiency of tunnel deformation monitoring methods in China, it is necessary to effectively improve the efficiency of tunnel deformation monitoring....
Study on Integration Mode of Station-level Weak Current System in Urban Rail Transit
Objective Restricted by operation and maintenance management modes, the traditional station-level weak current systems generally adopt a separate computer room mode, causing a certain waste of civil construction scale. T...
Application of New Electricity Saving Technology in Urban Rail Transit Depot
[Objective] The electricity consumption in vehicle depot accounts for a large proportion of the total in urban rail transit. In order to reduce the depot electricity consumption, it is necessary to do research on the app...