Mechanical Response Characteristics of Shallow-buried Concealed Rectangular Large-section Tunnel in Soft Soil Stratum
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 10
Abstract
Objective The study aims to explore the technical methods for safe and effective construction of shallow-buried concealed rectangular large-section tunnels in urban soft soil stratum, so as to achieve safety control of the construction process. Method Taking a subway section tunnel project as example, the 4-guiding hole excavation and the 6-guiding hole with middle-guiding hole leading excavation two schemes are proposed. A three-dimensional numerical simulation model is established using finite difference software, to simulate the tunnel construction process and analyze the vertical displacement of the stratum and the changes in the initial support internal force during the tunnel construction process in detail. By analyzing and comparing with the on-site monitoring data, the rationality and effectiveness of the proposed scheme are verified. Result & Conclusion During the guiding hole excavation phase, the vertical stratum displacement at the top and bottom of the tunnel is most significant, and the excavation of the adjacent guiding hole has limited influence on the displacement. Using the 6-guiding hole excavation scheme, the maximum displacement value at the bottom is significantly reduced by 21.5% compared with the 4-guiding hole excavation scheme. At the same time, the vertical displacement rate at the bottom is also reduced by 6.1% during the construction process. In particular, during the construction of the middle guiding hole, the change rate of the vertical stratum displacement is about 1.2 times of that of the side guiding hole, indicating that the middle guiding hole has a more significant impact on the stratum. The 6-guiding hole excavation scheme is more effective in controlling stratum deformation and structural stress during construction, especially during the construction stage of the middle guiding hole, thus requiring special attention and strengthened monitoring and support measures.
Authors and Affiliations
Kang WU, Yusheng SHEN, Penghao YI, Zhishuan ZONG, Zegang QIU, Chen CHEN
Keywords
Related Articles
- EP ID EP749210
- DOI 10.16037/j.1007-869x.2024.10.007
- Views 28
- Downloads 0
Evaluation and Analysis of Energy-saving Type Energy Management System for Qingdao Metro Line 13
Objective The constructor of Qingdao Metro Line 13 has a higher requirement for energy saving during operation. In the process of construction, in order to implement the concept of energy saving, environmental protection...
Short-term Prediction Method for Passenger Density in Urban Rail Transit Based on Non-linear Kalman Filter
Objective In order to cope with massive passenger flow incidents, it is necessary to identify accurately the spatial and temporal distribution state and the evolution law of massive passenger flow in urban rail transit,...
Planar Minimum Curve Radius for Embedded Medium-low Speed Maglev Lines
[Objective] As a new type of rail transit, the embedded medium-low speed maglev system relies on non-contact support for vehicle and track systems, and the vehicle running mechanism is embedded within the track beam. The...
Research on Intelligent Control Platform in Urban Rail Transit FAO Scenario
[Objective] The existing operational mechanisms primarily rely on operational management systems that drive personnel to perform operational tasks. Operational staff communicate information through phones or intercom dev...
Impact of Small Clearance Bored Pile Construction under Rail Transit Bridges in Soft Soil Area
Objective The impact of small clearance construction between bored piles and piers of operational rail transit bridges in China′s coastal soft soil areas is becoming a bottleneck factor restricting urban rail transit pla...