Peck Formula Modification of and Engineering Application in Small Radius Curve Shield Tunneling Construction
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 4
Abstract
Objective In the urban rail transit line planning, curved tunnels, and even small radius curved tunnels are often chosen due to influencing factors such as building foundations, underground pipelines, and weak soil layers. Compared to straight tunnels, the shield tunneling construction in small radius curved tunnels increases uncontrolled land subsidence risk. Therefore, it is necessary to study land subsidence control in shield tunneling construction on small radius curved tunnels. Method By calculating the over-excavation gap during curved tunnel shield tunneling construction, the over-excavation quantity for each ring within the curved section is derived. Furthermore, the relationship between tunnel radius and formation loss rate is obtained by introducing formation loss rate. Based on the applicability statistical analysis of existing Peck formula, a modified Peck formula suitable for shield tunneling construction in small radius curved tunnels is derived considering the base formation loss rate, total formation loss rate, additional formation loss rate due to over-excavation, and the calculation of settlement volume slices. Using an engineering of a metro line in Taiyuan as research background, the results of the modified Peck formula calculation are compared with the on-site monitoring data to validate its applicability. Result & Conclusion The verification results from the case study demonstrate that the modified Peck formula is applicable for shield tunneling construction on small radius curved tunnels.
Authors and Affiliations
Linghang YANG
Keywords
Related Articles
- EP ID EP734154
- DOI 10.16037/j.1007-869x.2024.04.008
- Views 36
- Downloads 0
Deformation Effect Analysis of Shield Tunnel Closely Side-passing Viaduct Pile Foundation
Objective Shield tunneling may cause displacement and deformation of the nearby viaduct foundation and reduce its bearing capacity. Therefore, the deformation effect caused by shield tunnel closely side-passing viaduct f...
Integrated Prediction Model for Urban Rail Transit Station Feeder Passenger Flow
[Objective] The rational coordination of feeder facilities is crucial for maximizing the functionality of urban rail transit. To quantitatively describe the distribution of passenger flows originating from urban rail tra...
Optimal Algorithm of Tram Section Energy-saving Speed Curve under Fixed Time Constraint
Objective Calculation of tram operation control scheme taking into account energy consumption requires a great deal of calculation of the energy-saving speed profile. In order to establish an accurate and efficient optim...
Adhesion Control Method for EMU
Objective Given the high operating speeds, minimal residual acceleration margin, and open-air track conditions of EMU (electric multiple units), as well as the deficiencies in conventional combination correction methods...
Electromagnetic Field Analysis of Dual-power Traction Power Supply System in Rail Transit Depot under AC-DC Switching Power Supply Mode
Objective The AC-DC (alternating current-direct current) dual-power traction power supply system depot features densely distributed tracks and relatively close catenary clearance. Different power supply modes can affect...