Apart from the settlement trough, the joint behavior in terms of dislocation and opening plays a pivotal role in determining the longitudinal performance of shield tunnel, while they have been less tackled neither on the site nor in the scaled test system. This paper proposes a novel physical modeling system with the emphasis on capturing both the longitudinal settlement trough and circumferential joint behavior of shield tunnel in one test. The test results have been compared with field data, exhibiting similar trends and magnitudes of change. Utilizing this newly proposed test system, relationship between joint dislocation and opening under differential settlement trough is closely revisited and the proportion of these two joint behaviors could be revealed as the responses to the maximum settlement of the troughs. Results show that the development of dislocation between rings is more prominent than joint opening at a small level of settlement and a higher proportion of joint opening would occur as the settlement increases. Besides, a modest linear correlation between the differential settlement and joint dislocation is observed, whereas no clear correlation is evident between the differential settlement and joint opening. Additionally, the paper discusses the adjustments for sensor position when utilizing this system to measure the tunnel heave or radial joint deformation. Overall, the good working performance and high measuring accuracy of the physical modeling system can enable more precise evaluations of tunnel deformation and refined structural behavior under various conditions.

中文翻译：

---

通过新颖的物理建模系统了解盾构隧道从沉降到节理行为的纵向性能


除了沉降槽外，错位和开孔方面的联合行为在决定盾构隧道的纵向性能方面起着关键作用，而它们在现场和按比例测试系统中都没有得到较少的处理。本文提出了一种新的物理建模系统，重点是在一次测试中同时捕获盾构隧道的纵向沉降槽和周向节理行为。测试结果已与现场数据进行了比较，显示出相似的趋势和变化幅度。利用这一新提出的测试系统，仔细重新审视了差异沉降槽下关节位错与张开之间的关系，并揭示了这两种关节行为的比例，作为对槽最大沉降的响应。结果表明，在小沉降水平上，环间错的发展比节理张开更突出，并且随着沉降的增加，节理张开的比例会更高。此外，观察到差异沉降与关节位错之间存在适度的线性相关性，而差异沉降与关节张开之间没有明显的相关性。此外，本文还讨论了在利用该系统测量隧道隆起或径向节理变形时对传感器位置的调整。总体而言，物理建模系统良好的工作性能和较高的测量精度可以更精确地评估隧道变形，并精细化各种条件下的结构行为。