Structural Force Monitoring and Calculation of the Metro Shield Tunnel in Subsea Weathered Slot
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 10
Abstract
Objective In order to explore the load distribution characteristics of shield tunnel structures in subsea weathered slot, a study on the internal force response law of the segment structures is carried out. Method Relying on a cross-sea metro shield tunnel project, systematic monitoring of water-soil loads and structural internal forces of the segments is carried out for the subsea weathered slot section. Through data analysis, the distribution characteristics of the tunnel structural loads and internal forces in this area are revealed. The fatigue characteristics of the segments under tidal load are further verified. Result & Conclusion ① The monitoring results show that the soil and water pressures and the internal forces of the reinforcement tend to stabilize after significant fluctuations in the initial stage. In the stable stage, water-soil pressure is maintained within the range of 0.1~0.4 MPa, the stress range of the inside reinforcement is -2.19~-38.60 MPa, and that of the outside reinforcement is -6.95~-34.59 MPa. The ratio between the calculated and measured values of the reinforcement stress is 0.6~1.8, which shows a good consistency. ② The water-soil loads on the segments show corresponding fluctuations with the periodic changes of the tidal water level (period of 12 h). The maximum main stress level at the segment joint is -2.45~-2.60 MPa, the stress amplitude is between 0.31~0.34 MPa, and the stress ratio is between 0.87~0.96. ③ Under different tidal load amplitude conditions, the segment stress level remains relatively stable, while the stress amplitude increases linearly with the increase of tidal load amplitude, and the stress ratio shows a linear downward trend. When the tidal load amplitude reaches 5 times of the actual measured value, the main stress amplitude of the segment increases to 1.70 MPa, and the stress ratio decreases to 0.84, at this time the maximum value of the concrete main stress ranges from -1.6 to -3.6 MPa.
Authors and Affiliations
Qiang ZHANG, Jiuli WANG
Keywords
Related Articles
- EP ID EP749224
- DOI 10.16037/j.1007-869x.2024.10.021
- Views 43
- Downloads 0
Research on High Power Fire Smoke Exhausting Scheme for Straddle Monorail Tunnel with Large Slope
［Objective］ The increase of fire power and slope steepness in straddle monorail tunnel will lead to the rise of critical wind speed for fire and the addition of smoke exhausting equipment configuration. Therefore, it i...
Demand-driven Design Method for Rail Transit Vehicles
［Objective］ To address the diverse design needs of different products and meet customer requirements for quick design and manufacture of high-speed trains, it is necessary to study demand-driven design methods for rail...
Design and Realization of Urban Rail Transit AFC Intelligent Operation and Maintenance System Architecture Driven by Dual-core of Data and Model
Objective The traditional urban rail transit AFC (automatic fare collection) system suffers from maintenance problems such as slow speed, outdated method, unreasonable plan and high cost. It is necessary to adopt digital...
Health Status Evaluation of Urban Rail Transit Traction Transformers Based on Analytic Hierarchy Process and Entropy Weight Method
［Objective］ The purpose of health status evaluation of the traction power supply equipment is to provide references for the operation, repair and maintenance of this equipment in urban rail transit. ［Method］ A health...
Research Focus at Different Stages of Urban Rail Transit Prophase Works in the New Era
[Objective] In the future, China′s urban development will shift from construction-orientation to governance-orientation. As an important part of the Chinese-style modern social governance system, urban planning is an imp...