Numerical simulation of segmental lining tunnel subjected to internal explosive loading is carried out in this paper based on the arbitrary-Lagrangian-Eulerian (ALE) and finite element (FE) coupled algorithms. A high-fidelity FE model considering assembled features of segmental lining structure is established, and the mapping technique is adopted to accurately simulate the explosion process. The calculated overpressure histories and failure modes of the lining structure fit well with field test results of full-scale specimens, indicating the applicability and accuracy of the numerical model. A more comprehensive numerical model considered the practical service state of segmental lining tunnel is further built based on the verified model. Influences of mechanical properties and pressure levels of surrounding soils on dynamic responses of tunnel structure under internal explosion are investigated. Numerical results show that dominated deformation modes of the segmental lining tunnel under the action of internal explosion include opening deformation at the segmental joints of the charged ring and shear deformation between the adjacent rings. The modest explosion caused by terrorist bombing attacks may severely harm the shield tunnel structure and impair its service performance, especially if the tunnel is buried in soft soil at a shallow depth

基于任意-拉格朗日-欧拉(ALE)和有限元(FE)耦合算法，对承受爆炸内荷载的管片衬砌隧道进行了数值模拟。建立了考虑管片衬砌结构装配特征的高保真有限元模型，采用映射技术对爆炸过程进行了精确模拟。计算得到的衬砌结构超压历史和破坏模式与全尺寸试件现场试验结果吻合较好，表明数值模型的适用性和准确性。在验证模型的基础上，进一步建立了考虑管片衬砌隧道实际服役状态的更全面的数值模型。研究了内爆作用下隧道结构力学特性和周围土体压力水平对隧道结构动力响应的影响。数值结果表明，内爆作用下管片衬砌隧道的主要变形方式为荷电环管片节缝处的张开变形和相邻环之间的剪切变形。恐怖爆炸袭击造成的轻微爆炸可能会严重破坏盾构隧道结构并影响其使用性能，特别是当隧道埋在浅的软土中时 数值结果表明，内爆作用下管片衬砌隧道的主要变形方式为荷电环管片节缝处的张开变形和相邻环之间的剪切变形。恐怖爆炸袭击造成的轻微爆炸可能会严重破坏盾构隧道结构并影响其使用性能，特别是当隧道埋在浅的软土中时 数值结果表明，内爆作用下管片衬砌隧道的主要变形方式为荷电环管片节缝处的张开变形和相邻环之间的剪切变形。恐怖爆炸袭击造成的轻微爆炸可能会严重破坏盾构隧道结构并影响其使用性能，特别是当隧道埋在浅的软土中时