In this study, the impact behaviour of tunnel lining structures constructed using a novel topological interlocking system with steel fibre reinforced concrete (SFRC) bricks is comprehensively investigated. A sophisticated finite element model is firstly developed to simulate the impact tests on the interlocking SFRC tunnel specimens. The model considers the geometric details of the main components of the test setup, including drop hammer, guide columns, interlocking tunnel specimen, rubber cover, and frames. Furthermore, a newly developed SFRC constitutive model is employed in the present model to accurately capture the dynamic behaviour of SFRC. By comparing the predicted results with experimental data, the developed numerical model has been demonstrated to be highly accurate. Six new non-planar topological interlocking bricks are then developed based on different patterns, and a parametric study is carried out to investigate the effect of geometric parameters on the dynamic response of the topological interlocking SFRC tunnel structures. Finally, recommendations for designing topological interlocking SFRC tunnel segments are provided based on the findings from this study.

中文翻译：

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冲击荷载作用下隧道衬砌结构非平面联锁纤维增强混凝土砖的数值模拟与对比设计


在本研究中，全面研究了使用新型拓扑联锁系统和钢纤维增强混凝土 （SFRC） 砖建造的隧道衬砌结构的冲击性能。首先开发了一个复杂的有限元模型来模拟对联锁 SFRC 隧道试件的冲击试验。该模型考虑了测试装置主要部件的几何细节，包括落锤、导柱、互锁隧道试样、橡胶盖和框架。此外，该模型采用新开发的 SFRC 本构模型来准确捕获 SFRC 的动态行为。通过将预测结果与实验数据进行比较，所开发的数值模型已被证明是高度准确的。然后，基于不同的模式开发了 6 种新的非平面拓扑互锁砖，并进行了参数化研究，以研究几何参数对拓扑互锁 SFRC 隧道结构动力响应的影响。最后，根据本研究结果，为设计拓扑联锁 SFRC 隧道管片提供了建议。