|Table of Contents|

[1] Qin Gan, Cao Shengrong, Lai Xu, Yang Fan, et al. Effect of insufficient tunnel crown thicknesson the post-tensioned concrete lining of the Yellow RiverCrossing Tunnel and its strengthening schemes [J]. Journal of Southeast University (English Edition), 2018, (3): 356-363. [doi:10.3969/j.issn.1003-7985.2018.03.011]
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Effect of insufficient tunnel crown thicknesson the post-tensioned concrete lining of the Yellow RiverCrossing Tunnel and its strengthening schemes()
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
Issue:
2018 3
Page:
356-363
Research Field:
Other Disciplines
Publishing date:
2018-09-20

Info

Title:
Effect of insufficient tunnel crown thicknesson the post-tensioned concrete lining of the Yellow RiverCrossing Tunnel and its strengthening schemes
Author(s):
Qin Gan Cao Shengrong Lai Xu Yang Fan
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
Keywords:
post-tensioned concrete linings tunnel crown thickness stress redistribution finite element analysis tunnel reinforcement Yellow River Crossing Tunnel
PACS:
TV332
DOI:
10.3969/j.issn.1003-7985.2018.03.011
Abstract:
The effect of deficiency in tunnel crown thickness on the Yellow River Crossing Tunnel with post-tensioned concrete inner lining was investigated by the elasto-plastic finite element method. Changes in the deformations and circumferential stresses of the post-tensioned concrete inner lining with the gradual decrease of the tunnel crown thickness were compared, and the potential bearing risk of insufficient tunnel crown thickness for the Yellow River Crossing Tunnel was revealed. Based on the finite element calculation results of circumferential stresses under different defective cases, the corresponding reinforcement schemes were proposed. The calculation results show that the inner lining can still maintain a satisfactory stress state when the tunnel crown thickness is equal to or greater than 0.28 m. When the tunnel crown thickness decreases below 0.28 m, the external surface of the crown and internal surface of the crown’s adjacent areas may be under tension. The tension stresses will incrementally increase and ultimately exceed the tensile strength of the inner lining concrete as the tunnel crown thickness further decreases gradually. Then, the Yellow River Crossing Tunnel cannot operate normally, and severe cracking, leaking or even failure may occur. When the tunnel crown thickness is equal to or greater than 0.28 m, the reinforcement suggestions are that the void spaces between the inner lining and the outer lining should be back-filled with concrete. When the tunnel crown thickness is less than 0.28 m, the inner lining should be reinforced by steel plates after concrete back-filling.

References:

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Memo

Memo:
Biographies: Qin Gan(1989—), male, Ph.D. candidate; Cao Sheng-rong(corresponding author), male, doctor, associate professor, shrcao@whu.edu.cn.
Foundation items: The Natural Science Foundation of Hubei Province(No.2017CFB667), the National Natural Science Foundation of China(No. 51079107).
Citation: Qin Gan, Cao Shengrong, Lai Xu, et al. Effect of insufficient tunnel crown thickness on the post-tensioned concrete lining of the Yellow River Crossing Tunnel and its strengthening schemes[J].Journal of Southeast University(English Edition), 2018, 34(3):356-363.DOI:10.3969/j.issn.1003-7985.2018.03.011.
Last Update: 2018-09-20