Safety design of tunnel lining structure considering bond-slip failure mechanism

A tunnel primary lining structure is consist of sprayed shotcrete and encased steel arch exhibiting inherent steel–concrete bond-slip failure. This paper aims to quantify the impact of interface slippage on tunnel safety. Firstly, a four-point flexural laboratory test and numerical simulation are co...

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Bibliographic Details
Published in:Arabian journal of geosciences 2022-03, Vol.15 (6), Article 489
Main Authors: Sun, Huibin, Song, Shuguang, Lu, Wei, Ren, Quangang, Li, Xu, Miao, Xin
Format: Article
Language:English
Subjects:
Deduction
Ductility
Earth and Environmental Science
Earth science
Earth Sciences
Failure mechanisms
Laboratory tests
Linings
Mathematical models
Mechanical properties
Original Paper
Reliability analysis
Safety
Safety engineering
Slip
Slippage
Sprayed concrete
Steel
Steel structures
Stiffness
Support vector machines
Tunnel linings
Tunnels
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Summary:A tunnel primary lining structure is consist of sprayed shotcrete and encased steel arch exhibiting inherent steel–concrete bond-slip failure. This paper aims to quantify the impact of interface slippage on tunnel safety. Firstly, a four-point flexural laboratory test and numerical simulation are conducted on different types of lining structures to study the mechanical properties of lining. Secondly, mechanical deduction of composite linings is carried out and verified by experimental results; validation results show promising consistency. The support characteristic curve (SCC) of primary lining is modified accordingly to interact with ground reaction curve (GRC) based on convergence-confinement method, representing the relationship between bond-slip properties and tunnel safety index, which is also trained by a support vector machine (SVM) learning model. Thereafter, a reliability-based tunnel safety evaluation approach considering lining failure mechanism using SVM is proposed. Research results revealed that bond-slip failure has a significant effect on the strength, stiffness, and ductility of tunnel lining, which is also proved to be important to tunnel safety control. The research results can provide reference for related engineering.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-022-09832-7