Study on the Segment Damage Mechanism of Curved Shield Tunnels during Construction Stage
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 10
Abstract
Objective Damage to shield tunnel segments will cause water seepage in the tunnel, affecting the structural bearing capacity and endanger the operational safety. Therefore, it is necessary to study the mechanism of segment structure damage. Method Through investigation and statistics, the occurrence law and influencing factors of segment diseases are obtained. ABAQUS software is used to conduct a numerical analysis on the force characteristics of segment detail structure, circumferential bolts, longitudinal bolts and concave-convex tenons under different jack horizontal thrusts. Result & Conclusion The incidence of segment damage increases gradually from vault to hance and then to arch bottom, and the incidence of damage in arch bottom area is the highest. The segment damage is closely related to the thrust value of the jack partitions. Numerical simulation results show that with the increase of the total thrust value, the maximum principal stress value of the bolt decreases gradually, while the value at the concave-convex tenon increases rapidly. The greater the thrust, the smaller the longitudinal bolt stress value. When the thrust is too large, the longitudinal bolt tensile stress tends to 0, the segment shrinks longitudinally, and the pressure on the segment increases sharply.
Authors and Affiliations
Bin ZHU
Keywords
Related Articles
- EP ID EP749223
- DOI 10.16037/j.1007-869x.2024.10.020
- Views 109
- Downloads 0
Active Control Technology for Lift Wing Structure Motion in High-speed Railway EMU
［Objective］ The lift wing structure of high-speed railway EMU (electric multiple units) can reduce the wheel-rail frictional resistance, thereby decreasing wheel wear. However, due to the complex and variable operating...
Dynamic Health Evaluation Method for Metro Communication System Based on Random Forests Algorithm
Objective The health of metro communication system has a direct bearing on the efficiency and safety of metro operation. In view of the problems such as one-sided evaluation results and subjective evaluation criteria in...
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...
Dynamics Response Simulation Analysis of Underground Space Semi-suspended Lanes under Double-decker Vehicle Loads
Objective The new prestressed hanging wall semi-suspended lane structure in underground complex offers advantages of aesthetic appearance and large clearance. However, the research on the mechanical properties of the new...
Research on Embedded Track System Vibration Transmission
Objective Embedded tracks have relatively high damping, providing good vibration and noise reduction performance. Therefore, it is necessary to study the vibration reduction mechanism of embedded track system. Method Tak...