以超大直径盾构隧道为原型,基于3D打印技术设计并制作用于振动台试验的盾构隧道关键节点模型.探讨3D打印技术应用于盾构隧道模型设计的技术难点,如结构相似比设计与3D打印材料性质的匹配性、大型结构模型的最优化分块分段打印技术、结构模型的3D打印实现与拼装等.提出大体积结构模型拆分打印的基本原则,制作出符合试验要求的联络通道和工作井等关键节点模型,检验3D打印技术在隧道结构模型设计和制作中的可行性,并总结3D打印技术的优势和制约其推广应用的原因.%Taking large-diameter shield tunnels as the prototype target, this paper first applied the 3D-print technology in the design and fabrication of shield tunnel models, including the critical parts (i.e. connecting passage and working shaft) used for shaking table tests. The technical difficulties of application of 3D-print technology in shield tunnel model design were systematically discussed, e.g. how to match the properties of 3D-print materials to the similitude ratio design, how to divide a large structure model into smaller pieces to fit the size limitation of the 3D-print machine, how to realize 3D-print model parts and assemble them together. Finally, the basic principle of optimal 3D-print technology for large-scale structural models was proposed, and the tunnel model with critical connection parts were deigned and fabricated. Results show that the fabricated modelsusing the proposed 3D-print technology perfectly satisfy the requirements of the test. Therefore, the feasibility of the application of 3D-print technology in design and fabrication of tunnel structure models is fully validated. Advantages and limitations of the 3D-print technology are also summarized.
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