| Title: | Re-evaluating restrained shrinkage tests for sustainable sprayed concrete tunnel linings |
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| Authors: | ID Xu, Zhongyu (Author)
ID Hanžič, Lucija (Author)
ID Asche, Harry (Author)
ID Karlovšek, Jurij (Author) |
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| Files: |  URL - Source URL, visit https://doi.org/10.1201/9781003559047-66
 PDF - Presentation file, download (476,48 KB)
MD5: C9F839F2D91635224DE3C05A1F3D9880
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| Language: | English |
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| Typology: | 1.08 - Published Scientific Conference Contribution |
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| Organization: |  ZAG - Slovenian National Building and Civil Engineering Institute
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| Abstract: | The demand for tunnelling and underground construction is steadily increasing, alongside growing considerations for carbon emission reduction in tunnelling projects. Using sprayed concrete as a prominent ground support mechanism for the sequential excavation method is also undergoing low-carbon transition with improved resource efficiency. Enhancing the durability of sprayed concrete linings for structural support and water tightness is essential, particularly when used as a permanent lining, replacing conventional cast in-situ concrete for a design life exceeding 100 years. As sprayed concrete is a time-dependent material used in a time-dependent tunnelling environment, restrained shrinkage cracking in tunnel linings is a recognised issue, especially in mined tunnels in shallow or hard-rock ground with minimal ground movement. The susceptibility of sprayed concrete to restrained shrinkage cracking poses challenges to low-carbon transition, impacting the efficacy and longevity of tunnel linings. Excessive crack widths in tunnel projects often lead to non-conformances, requiring time-consuming repairs and affecting project delivery. However, current design methods for permanent sprayed concrete linings inadequately consider the effects of restrained shrinkage, particularly with sprayed concrete containing reinforcement fibres and accelerators. This paper examines the features that should be included in the restrained shrinkage test for tunnel lining applications, and proposes an improvement in detecting crack initiation and determining the optimal number of measurement points form when multiple cracks form with a finite element analysis. The analysis results showed the possibility of detecting the onset of cracking and crack location with multiple measurement points by interpreting the response of each measurement point. |
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| Keywords: | tunnel linings, sprayed concrete, restrained shinkage, large ring test |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 08.05.2025 |
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| Publisher: | CRC Press |
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| Year of publishing: | 2025 |
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| Number of pages: | Str. 509-516 |
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| PID: | 20.500.12556/DiRROS-23646  |
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| UDC: | 620.1/.2 |
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| DOI: | 10.1201/9781003559047-66 |
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| COBISS.SI-ID: | 248857603 |
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| Copyright: | © 2025 The Author(s) |
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| Publication date in DiRROS: | 19.09.2025 |
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| Views: | 338 |
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| Downloads: | 140 |
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| Metadata: |    |
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