重型车辆撞击作用下大直径盾构隧道衬砌力学响应分析

Mechanical Response Analysis of Large Diameter Shield Tunnel Lining under the Impact of Heavy Vehicle

摘要: 随着城市化进程的加快和交通运输需求的增加，盾构隧道成为现代化交通建设的重要领域。重型车辆撞击隧道可能会导致衬砌结构的应力集中和破坏，因此对其力学响应的分析尤为重要。首先利用ABAQUS软件建立大直径盾构隧道模型，模型考虑了隧道衬砌材料的非线性力学特性以及土体和隧道衬砌之间的相互作用。然后，对模型施加重型车辆撞击速度，分析其对隧道衬砌的应力及位移等力学响应。研究结果表明，重型车辆撞击会在隧道衬砌中产生显著的应力集中现象，尤其在撞击点附近应力最大。此外，随着撞击速度和撞击角度的增加，隧道衬砌的最大位移也随之增大，可能引发局部结构破坏甚至整体失稳。本文的研究为盾构隧道的设计和施工提供了理论依据，有助于提高隧道结构的抗撞击能力和安全性。

Abstract: With the acceleration of urbanization and the increase of transportation demand, shield tunnels have become an important field for modern transportation construction. The impact of heavy vehicle on the tunnel may lead to stress concentration and damage of the lining structure, so the analysis of its mechanical response is particularly important. ABAQUS software is first used to establish a large-diameter shield tunnel model, which takes into accounts the nonlinear mechanical properties of the tunnel lining material and the interaction between the soil and the tunnel lining. Then, heavy vehicle impact velocity was applied to the model to analyze its mechanical response to the tunnel lining in terms of stress and displacement. The results show that the heavy vehicle impact produces a significant stress concentration in the tunnel lining, especially near the impact point. In addition, the maximum displacement of the tunnel lining increases with the increase of impact velocity and impact angle, which may cause local structural damage or even overall instability. This paper provides a theoretical basis for the design and construction of shield tunnels, and helps to improve the impact resistance and safety of tunnel structures.