Zheng Xiaomeng, Wu Kui, Shao Zhushan, Yuan Bo, Zhao Nannan
School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Shaanxi Key Lab. of Geotechnical and Underground Space Engineering (XAUAT), Xi'an University of Architecture and Technology, Xi'an 710055, China.
Materials (Basel). 2022 Jan 5;15(1):391. doi: 10.3390/ma15010391.
Shotcrete lining shows high resistance but extremely low deformability. The utilization of yielding elements in shotcrete lining, which leads to the so-called ductile lining, provides a good solution to cope with tunnel squeezing deformations. Although ductile lining exhibits great advantages regarding tunnel squeezing deformation control, little information has been comprehensively and systematically available for its mechanism and design. This is a review paper for the purpose of summarizing the development history and discussing the state of the art of ductile lining. It begins by providing a brief introduction of ductile lining and an explanation of the importance of studying this issue. A following summary of supporting mechanism and benefits of ductile lining used in tunnels excavated in squeezing ground conditions is provided. Then, it summarizes the four main types of yielding elements applied in shotcrete lining and introduces their basic structures and mechanical performances. The influences of parameters of yielding elements on the supporting effect are discussed and the design methods for ductile lining are reviewed as well. Furthermore, recommendations for further research in ductile lining are proposed. Finally, a brief summary is presented.
喷射混凝土衬砌具有高抗力但极低的变形能力。在喷射混凝土衬砌中使用屈服元件，即所谓的延性衬砌，为应对隧道挤压变形提供了一个很好的解决方案。尽管延性衬砌在控制隧道挤压变形方面具有很大优势，但其作用机理和设计方面的全面系统信息却很少。本文是一篇综述文章，旨在总结延性衬砌的发展历程并探讨其研究现状。文章首先简要介绍了延性衬砌，并解释了研究该问题的重要性。接着总结了在挤压地层条件下开挖的隧道中使用延性衬砌的支护机理和优点。然后，总结了应用于喷射混凝土衬砌中的四种主要屈服元件类型，并介绍了它们的基本结构和力学性能。讨论了屈服元件参数对支护效果的影响，并回顾了延性衬砌的设计方法。此外，还提出了延性衬砌进一步研究的建议。最后，给出了简要总结。
