TBM Selection Optimization and Tunneling Parameter Control in Complex Offshore Strata for Urban Rail Transit
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 3
Abstract
[Objective] In order to improve the formation adaptability of the tunnel boring machine (shorten as TBM) and solve the problem of TBM selection for the west extension section of Qingdao Metro Line 2 (hereinafter referred to as Line 2) in the complex formation offshore, it is necessary to optimize TBM selection and control tunneling parameters. [Method] From the aspects of geological condition adaptability, construction flexibility and excavation efficiency, the TBM types are comprehensively compared and the one suitable for hard rock excavation is selected. In view of the engineering difficulties in the TBM tunneling section of Line 2, such as crossing fracture zone, insufficient starting space, small curvature radius construction and lack of lifting conditions, the TBM is optimized. The range of parameter values including thrust, torque, cutter speed and net tunneling rate of double-shield TBM under different grades of wall rock are determined. [Result & Conclusion] After comprehensive comparison, DSUC type double shield TBM is selected for the construction of Line 2 west extension section in complex offshore strata. This type of TBM has good formation adaptability and flexible support methods. By optimizing cutter head, shield body and back-up train design, improving the starting, disassembling and small curvature radius construction scheme, and improving the advance reinforcement and guidance system, TBM application becomes more economical and reasonable. When the TBM advances in the medium hard rock formation, the thrust and torque can be properly improved to increase the net tunneling rate. The tunneling parameters should be strictly controlled to reduce the disturbance to the palm surface when the TBM passes through fault fracture zone.
Authors and Affiliations
Jian SHI, Weijing LIU, Shilin ZHANG, Suozai LI, Desen KONG
Keywords
Related Articles
- EP ID EP732782
- DOI 10.16037/j.1007-869x.2024.03.008
- Views 59
- Downloads 0
Fault Analysis and Optimization Scheme of Insufficient Air Braking in Metro Train
［Objective］ Currently, when metro trains operate on mainline tracks under the ATO (automatic train operation) mode and stop at stations, the rail transit signaling system must confirm that all braking signals are appli...
Scheme of High Speed Contact Rail System for 120 km/h and above
Objective In order to meet the demand for traction current collection in rail transit at the speed of 120 km/h and above, the research on high speed contact rail system is conducted and a complete optimization scheme is...
Analysis on City (Suburban) Railway Operating Subsidies and Recommendation
［Objective］ Operating subsidies are a crucial guarantee for the healthy development of CSR (city (suburban) railways), reflecting their public service nature. The involvement of national railways in the construction an...
Air Defense Scheme of Airside MRT Vehicle Base in Shanghai Pudong International Airport
Objective The air defense control mode for airside MRT（mass rapid transit system） vehicle base of the airport directly affects the airport air defense safety and vehicle maintenance efficiency. Incorporating Pudong Int...
Fault Diagnosis Method for High-speed Train Gearbox Bearing Based on Improved VMD and Temperature-vibration Feature Fusion
Objective Existing methods for high-speed train gearbox bearing monitoring and diagnosis in China often rely solely on temperature or vibration data. Rely solely on a single temperature data point may result in missing e...