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Article

Fatigue Performance of Tunnel Invert in Newly Designed Heavy Haul Railway Tunnel

by 1,2, 1, 1,3,*, 1 and 1,2
1
School of Civil Engineering, Central South University, Changsha 410075, China
2
School of Civil Engineering, Guizhou University, Guiyang 550025, China
3
Key Laboratory of Engineering Structure of Heavy Haul Railway (Central South University), Changsha 410075, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(24), 5514; https://doi.org/10.3390/app9245514
Received: 22 November 2019 / Revised: 10 December 2019 / Accepted: 12 December 2019 / Published: 14 December 2019
The Haoji railway in China is the longest heavy haul railway in the world, including 235 tunnels located along the 1837 km railway. With the increasing axle load of the new line and the basal deterioration of the existing heavy haul railway in China, studying the fatigue performance of the newly designed tunnel structure is essential. To study the coupling effect of the surrounding rock pressure and 30 t axle load train, in this study, we combined three-dimensional numerical simulation and three-point bending fatigue tests to investigate the fatigue performance of the basal structures. The results of numerical simulation indicate that the center of the inverted arch secondary lining is the position vulnerable to fatigue in the lower tunnel structures; the surrounding rock pressure performance exerts a stronger influence on the stress state of the vulnerable position than the dynamic train loads. The S–N formula obtained from the experiment showed that the fatigue life of tunnel bottom structures decreases with increasing surrounding rock pressure and dynamic load. In typical grade V surrounding rock and 30 t axle loads, fatigue failure will not occur in the newly designed tunnel bottom structures within 100 years if bedrock defects are lacking and pressure of surrounding rock is not excessive. View Full-Text
Keywords: heavy haul; railway tunnel; bottom structure; fatigue heavy haul; railway tunnel; bottom structure; fatigue
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MDPI and ACS Style

Liu, C.; Peng, L.; Lei, M.; Shi, C.; Liu, N. Fatigue Performance of Tunnel Invert in Newly Designed Heavy Haul Railway Tunnel. Appl. Sci. 2019, 9, 5514. https://doi.org/10.3390/app9245514

AMA Style

Liu C, Peng L, Lei M, Shi C, Liu N. Fatigue Performance of Tunnel Invert in Newly Designed Heavy Haul Railway Tunnel. Applied Sciences. 2019; 9(24):5514. https://doi.org/10.3390/app9245514

Chicago/Turabian Style

Liu, Cong, Limin Peng, Mingfeng Lei, Chenghua Shi, and Ning Liu. 2019. "Fatigue Performance of Tunnel Invert in Newly Designed Heavy Haul Railway Tunnel" Applied Sciences 9, no. 24: 5514. https://doi.org/10.3390/app9245514

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