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 84
- Downloads 0
Key Technologies and Application of Safety Protection in Urban Rail Transit FAO Line Vehicle Depots
[Objective] Nowadays, the safety protection capability of urban rail transit FAO (fully automatic operation) line vehicle depots is not well matched with the level of fully automatic driving technology, which is limiting...
Evaluation Method of Bogie Outer Positioning Anti-rolling Torsion Bar Structural Strength
Objective In order to solve the TBS (torsion bar shaft) torsional stiffness and strength for the outer support anti-rolling device in railway vehicles, an analytical method of introducing the TBS deformation coordination...
Study on Anti-overturning Characteristics of 60R2 Groove Rail and CHN60 Rail for Fastener Type Ballastless Track of Tram
Objective In order to provide theoretical support for the selection and design of the tram rail and fasteners in different sections, it is necessary to study the anti-overturning characteristics of the 60R2 groove rail a...
Research on Construction Management Standardization of Shanghai Rail Transit Line 15
Objective Urban rail transit project construction involves numerous management objects, complex processes and technical requirements. The imperfect standardized management system leads to frequent construction quality an...
Passing Performance of Inverted T-shaped Frog Turnouts for Suspended Monorail Vehicles
[Objective] The suspended monorail transportation system holds promising prospects, yet researches on the dynamics performance of vehicle passing through turnouts remain relatively scarce, requiring comparison for furthe...