scholarly journals EVALUATION METHOD FOR FATIGUE DAMAGE OF HIGH SPEED RAILWAY TUNNEL LINING USING A ONE-DIMENSIONAL UNSTEADY COMPRESSIBLE FLOW SIMULATION

2020 ◽  
Vol 76 (1) ◽  
pp. 94-109
Author(s):  
Masaaki MIYAMOTO ◽  
Takashi ARITA ◽  
Hiroshi OOMORI ◽  
Kojiro NOZAWA ◽  
Takanobu OGAWA ◽  
...  
Keyword(s):  
Compressible Flow ◽  
Fatigue Damage ◽  
High Speed ◽  
Evaluation Method ◽  
Flow Simulation ◽  
Tunnel Lining ◽  
Railway Tunnel ◽  
High Speed Railway ◽  
One Dimensional

Numerical Simulation on Mesoscopic Damage Evolution Mechanism of High-Speed Railway Tunnel Lining Concrete

2011 ◽  
Vol 90-93 ◽  
pp. 2248-2253
Author(s):  
Yun Dong Ma ◽  
Bo Li ◽  
Bin Fan
Keyword(s):  
High Speed ◽  
Damage Mechanism ◽  
Tunnel Lining ◽  
Concrete Lining ◽  
Railway Tunnel ◽  
High Speed Railway ◽  
Main Research ◽  
Elastic Module ◽  
Fatigue Loads ◽  
Research Stage

For the high-speed railway tunnel concrete lining, there have been some such initial damages as initial pores or cracks, therefore the initial damages will be expanded gradually under aerodynamic fatigue loads resulting from the high-speed train passing by tunnel, elastic module attenuation laws of concrete was adopted to reflect the effects of fatigue loads on the tunnel lining mesoscopic concrete, taking the second stage of the elastic module attenuation as the main research stage, the mesoscopic damage mechanism and fatigue damage cracks developing-and-changing laws of high-speed railway lining concrete were simulated under the repetitive aerodynamic loads. Study indicates: for the concrete lining with initial damages, under the repeated aerodynamic fatigue loads, the mechanical properties of the tunnel lining concrete will gradually deteriorate to the whole damage of the concrete structure, which will cause serious inference on the durability of the tunnel especially during the middle and later periods of the high-speed railway tunnel serving.

scholarly journals Response Characteristics of Cross Tunnel Lining under Dynamic Train Load

2020 ◽  
Vol 10 (12) ◽  
pp. 4406 ◽  
Author(s):  
Ang Wang ◽  
Chenghua Shi ◽  
Chenyang Zhao ◽  
E Deng ◽  
Weichao Yang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Stress Level ◽  
High Speed ◽  
Tunnel Lining ◽  
Static Stress ◽  
Railway Tunnel ◽  
High Speed Railway ◽  
Response Characteristics ◽  
Stress Levels ◽  
Long Time

The crossing area is a vulnerable component of the interchange high-speed railway tunnel because of the high-static stress level and the long-term dynamic train load in the operation period. Although attention has been paid to this problem, the response characteristics of high-speed railway tunnel lining at the cross position under the dynamic train load may still need further research as very little investigation is available on this issue at present. In this paper, the initial stress state and dynamic response characteristics of tunnel lining were studied using the three-dimensional finite element method. Furthermore, the damage evolutionary characteristics of the tunnel inverted arch under dynamic and initial static loads were researched using a set of self-developed indoor fatigue test devices. The size of the test box is 400 × 300 × 250 mm (length × width × height). Numerical simulation results indicate that the displacement and stress levels of tunnel lining are very high at the cross position. The stress increment of tunnel lining due to the dynamic train load is more likely to induce a break in the tunnel lining at this position. The indoor fatigue tests reveal that the change of structural strain increment amplitude and strain ratio is obvious when the dynamic load stress level is higher. It is better for dynamic stress levels not to exceed 0.6 times of structural tensile strength to avoid the tunnel lining being damaged in the long-time service period. The initial static load has an influence on the tunnel inverted arch, and the static stress level should be lower than 0.65 times of structural tensile strength to ensure the tunnel has long-time serviceability. This paper provides a reference for the future design of new cross tunnels and the operation safety evaluation and disease regulation of existing high-speed railway tunnels.

Investigation of a loess-mudstone landslide and the induced structural damage in a high-speed railway tunnel

2020 ◽  
Vol 79 (5) ◽  
pp. 2201-2212
Author(s):  
Shunhua Zhou ◽  
Zhiyao Tian ◽  
Honggui Di ◽  
Peijun Guo ◽  
Longlong Fu
Keyword(s):  
Structural Damage ◽  
High Speed ◽  
Railway Tunnel ◽  
High Speed Railway

Typical Portal Structure for Single Track High Speed Railway Tunnel in Rugged Mountainous Area with High and Abrupt Slope

2014 ◽  
Vol 716-717 ◽  
pp. 342-346
Author(s):  
Xiao Jun Zhou ◽  
Bo Jiang ◽  
Yue Feng Zhou ◽  
Yu Yu
Keyword(s):  
High Speed ◽  
Southwest China ◽  
Earth Pressure ◽  
Mountainous Area ◽  
Single Track ◽  
Railway Tunnel ◽  
High Speed Railway ◽  
Railway Line ◽  
Bridge Abutment

On the basis of different landform and multifarious topography in rugged mountainous area in southwest China, typical tunnel portals for single track tunnels in a new high speed railway line have been presented in the paper. The portal comprises headwall, shed tunnel, bridge abutment and its support. Portal with headwall is suitable for tunnel to resist front earth pressure on high and abrupt slope. Shed tunnel is placed in front of headwall so as to prevent rockfall; its outward part is built into a flared one. Meanwhile, the installation of bridge and its abutment are also included in the portal according to landform in the paper.

Sign in / Sign up

Export Citation Format

Share Document