Response Characteristics of Cross Tunnel Lining under Dynamic Train Load
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 l...
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doaj-441a2ee7a35344e290bf442a44f222b72020-11-25T03:05:54ZengMDPI AGApplied Sciences2076-34172020-06-01104406440610.3390/app10124406Response Characteristics of Cross Tunnel Lining under Dynamic Train LoadAng Wang0Chenghua Shi1Chenyang Zhao2E Deng3Weichao Yang4Hong He5School of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaThe 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.https://www.mdpi.com/2076-3417/10/12/4406cross tunnelhigh-speed railway tunnelrock thicknessfatigue test |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ang Wang Chenghua Shi Chenyang Zhao E Deng Weichao Yang Hong He |
spellingShingle |
Ang Wang Chenghua Shi Chenyang Zhao E Deng Weichao Yang Hong He Response Characteristics of Cross Tunnel Lining under Dynamic Train Load Applied Sciences cross tunnel high-speed railway tunnel rock thickness fatigue test |
author_facet |
Ang Wang Chenghua Shi Chenyang Zhao E Deng Weichao Yang Hong He |
author_sort |
Ang Wang |
title |
Response Characteristics of Cross Tunnel Lining under Dynamic Train Load |
title_short |
Response Characteristics of Cross Tunnel Lining under Dynamic Train Load |
title_full |
Response Characteristics of Cross Tunnel Lining under Dynamic Train Load |
title_fullStr |
Response Characteristics of Cross Tunnel Lining under Dynamic Train Load |
title_full_unstemmed |
Response Characteristics of Cross Tunnel Lining under Dynamic Train Load |
title_sort |
response characteristics of cross tunnel lining under dynamic train load |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2020-06-01 |
description |
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. |
topic |
cross tunnel high-speed railway tunnel rock thickness fatigue test |
url |
https://www.mdpi.com/2076-3417/10/12/4406 |
work_keys_str_mv |
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