Mechanical behavior of ultra-high toughness concrete (UHTC) tunnel segmental joints

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Minjin Cai
  • Hehua Zhu
  • Qing Chen
  • Timon Rabczuk
  • Xiaoying Zhuang

Organisationseinheiten

Externe Organisationen

  • Tongji University
  • Bauhaus-Universität Weimar
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Aufsatznummer105838
Seitenumfang20
FachzeitschriftTunnelling and Underground Space Technology
Jahrgang151
Frühes Online-Datum7 Juni 2024
PublikationsstatusVeröffentlicht - Sept. 2024

Abstract

Segmental joints in tunnel linings are considered weak points due to their limited tensile strength and poor crack resistance. Ultra-high toughness concrete (UHTC) offers a solution to these issues, thanks to its exceptional tensile strength, outstanding crack resistance, and impressive durability. However, the application of UHTC in tunnel segmental joints remains underexplored. To assess its suitability, this paper conducted comprehensive full-scale tests on UHTC and traditional reinforced concrete (RC) segmental joints. The study analyzed the mechanical properties of UHTC and RC joints, including material characteristics, segmental deflection, joint behavior, bolt strain, damage propagation, and failure modes. The results showed that: (1) UHTC joints exhibited superior stable bearing capacity, exceeding that of RC joints by 25 %, with a 42 % higher initial cracking strength. (2) UHTC joints also demonstrated excellent crack control, maintaining crack widths below 0.2 mm and preserving structural integrity. In contrast, RC joints experienced extensive cracking, leading to concrete fracture and spalling. (3) UHTC joints displayed remarkable toughness, surpassing RC joints by 2.48 times during the elastic growth stage and 1.55 times in the plastic stable growth stage. Meanwhile, UHTC joints exhibited 1.47 times greater ductility than RC joints. (4) Considering multi-scale mechanical effects, UHTC joints enhanced the toughness and strength advantages of UHTC over RC by over 30 % during the elastic stage. These findings highlight the potential of UHTC in shield tunnel construction, especially in challenging environments like high ground stress areas and earthquake fault zones.

ASJC Scopus Sachgebiete

Zitieren

Mechanical behavior of ultra-high toughness concrete (UHTC) tunnel segmental joints. / Cai, Minjin; Zhu, Hehua; Chen, Qing et al.
in: Tunnelling and Underground Space Technology, Jahrgang 151, 105838, 09.2024.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Cai M, Zhu H, Chen Q, Rabczuk T, Zhuang X. Mechanical behavior of ultra-high toughness concrete (UHTC) tunnel segmental joints. Tunnelling and Underground Space Technology. 2024 Sep;151:105838. Epub 2024 Jun 7. doi: 10.1016/j.tust.2024.105838
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AU - Cai, Minjin

AU - Zhu, Hehua

AU - Chen, Qing

AU - Rabczuk, Timon

AU - Zhuang, Xiaoying

N1 - Publisher Copyright: © 2024 Elsevier Ltd

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