3D printed concrete tunnel lining: Comparative study on mechanical properties of curved and straight printed specimens

被引：0
作者：
Lin, Xing-Tao [1 ,2 ,3 ,4 ]
Xu, Shuhao [1 ,2 ]
Chen, Xiangsheng [1 ,2 ,3 ,4 ]
Huang, Zhongkai [1 ,5 ]
机构：
[1] Shenzhen Univ, Key Lab Resilient Infrastruct Coastal Cities, MOE, Shenzhen 518060, Peoples R China
[2] Shenzhen Univ, Coll Civil & Transportat Engn, Shenzhen 518061, Peoples R China
[3] State Key Lab Intelligent Geotech & Tunnelling, Shenzhen 518060, Guangdong, Peoples R China
[4] Shenzhen Univ, Underground Polis Acad, Shenzhen 518060, Peoples R China
[5] Tongji Univ, Dept Geotech Engn, Shanghai 200092, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2025年 / 487卷
基金：
中国国家自然科学基金;
关键词：
3D printed concrete tunnel lining; Mechanical anisotropy; Compressive strength; Bending strength; Pore compaction; HARDENED PROPERTIES; PERFORMANCE;
D O I：
10.1016/j.conbuildmat.2025.142046
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
As a representative technology of Industry 4.0, additive manufacturing demonstrates significant potential in innovative tunnel lining structures. However, current research on the mechanical properties of 3D-printed concrete tunnel linings remains limited. This study systematically investigates the compressive and flexural performance of 3D-printed concrete tunnel linings fabricated through curved-path and linear-path printing strategies. A novel stress-difference based method is proposed to divide the compression process into five distinct phases: pore compaction, linear elasticity, yielding, failure, and residual stages. The anisotropic compressive strength characteristics under X, Y, and Z loading directions are analyzed, with particular emphasis on the influence of weak interfacial regions on mechanical behavior. The experimental results show that compared with linear printed samples, curved printed samples exhibit significantly superior compressive strength, while when loaded in the Z direction, they show significantly enhanced bending resistance compared to samples in the X and Y directions. This research elucidates the anisotropic mechanical properties of 3D-printed concrete and provides valuable insights for optimizing printing path strategies to enhance structural performance and mitigate compressive strength anisotropy.
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页数：15
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