Impact Analysis of Arch Vault Rise-span Ratio on Steel Pipe Pile Stress and Land Subsidence in Urban Rail Transit Covered PBA Method Stations
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 8
Abstract
Objective The arch vault rise-span ratio not only affects the building height, design rationality, and construction safety of covered PBA (pile-beam-arch) method urban rail transit stations. Therefore, it is necessary to study the impact of arch vault rise-span ratio on the stress of steel pipe pile stresss and land subsidence. Method A mechanical model of urban rail transit station arch vault structure is constructed to analyze the structural internal forces under different arch rise-span ratios. A 3D station-stratum numerical model of the station and surrounding soil is established using numerical simulation analysis software, and the rationality of the model is verified by comparing numerical simulation results of land subsidence and field monitoring data of land subsidence. The study also examines the mechanical properties of steel pipe piles and their impact on land subsidence during covered PBA method construction. Result & Conclusion When the arch rise-span ratio varies from 0.20 to 0.40, the maximum bending moment, maximum axial force, and maximum shear force of the arch vault structure show a decreasing trend. The maximum axial force of the steel pipe piles decreases initially and then increases; the middle pile axial forceit is the minimum with the arch vault rise-span ratio of 0.30. As the arch vault rise-span ratio increases, land subsidence first decreases and then increases. The optimal ratio for controlling land subsidence is 0.30, resulting in a 34% reduction compared to the arch vault rise-spana ratio of 0.20. The stages of pilot tunnel and arch closure construction cause the most significant land subsidence. An appropriate arch rise-span ratio increases the proportion of land subsidence induced during these two stages, thereby reducing the disturbance to the soil layers from the subsequent station main structure excavation.
Authors and Affiliations
Along WANG, Xianpeng LI, Jianjun LU
Keywords
Related Articles
- EP ID EP742695
- DOI 10.16037/j.1007-869x.2024.08.024
- Views 46
- Downloads 0
A Train Positioning Error Estimation Method Suitable for Multiple Trains Virtual Marshalling Control System
Objective Virtual marshalling technology requires high precision and accuracy of train positioning, and traditional train positioning technologies are unable to meet the safety requirements of the virtual marshalling SIL...
Overview of Rail Potential Suppression Technology in Urban Rail Transit Running Rail Circuit Return System
Objective In the DC (direct current) traction power supply system of urban rail transit, excessive rail potential and stray current issues are persistent problems and common ailments for operational routes. Therefore, it...
A Review of Turnout Switch Machine Fault Diagnosis Technology Based on Deep Learning
［Objective］ The turnout switch machine fault diagnosis techniques based on deep learning is summarized, the application status of various deep learning methods in turnout switch machine fault diagnosis is analyzed, the...
Calculation Model of Safety Distance between Shield Tunnels and Underground Cavities in Water-Rich Sandy Cobble Stratum
［Objective］ In order to ensure the shield tunnel construction safety in water-rich sandy cobble stratum when passing through underground cavities, it is necessary to study the safe distance between the shield tunnels a...
Development and Application of Mechanical Shield Tail Clearance Measurement Device Based on Angle Sensor
Objective In view of the constant changes of shield tail clearance during shield or tunnel boring machine excavation process, to ensure construction safety, it is necessary to measure shield tail clearance in real-time....