基于3D打印技术的盾构隧道模型设计与制作

Design and fabrication of shield tunnel models based on 3D-print technology

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 the3D-printtechnology in the design and fabrication of shield tunnel models,including the critical parts(i.e.connectingpassage and working shaft)used for shaking table tests.The technical difficulties of application of3D-printtechnology in shield tunnel model design were systematically discussed,e.g.how to match the properties of3D-print materials to the similitude ratio design,how to divide a large structure model into smaller pieces to fit thesize limitation of the3D-print machine,how to realize3D-print model parts and assemble them together.Finally,the basic principle of optimal3D-print technology for large-scale structural models was proposed,and the tunnelmodel with critical connection parts were deigned and fabricated.Results show that the fabricated model using the proposed3D-print technology perfectly satisfy the requirements of the test.Therefore,the feasibility ofthe application of3D-print technology in design and fabrication of tunnel structure models is fully validated.Advantages and limitations of the3D-print technology are also summarized.