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Experimental study on the tunnel collapse caused by leakage of the shield tail sealing system
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-09 , DOI: 10.1016/j.tust.2025.106374
Qihao Sun, Xian Liu, Yihai Bao, Wouter De Corte, Luc Taerwe
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-09 , DOI: 10.1016/j.tust.2025.106374
Qihao Sun, Xian Liu, Yihai Bao, Wouter De Corte, Luc Taerwe
With the rapid advancement of rail transit, shield tunnels have been extensively constructed worldwide. However, leakage at the shield tail can lead to severe consequences, including shield machine subsidence, structural damage to the tunnel, or even catastrophic tunnel collapse. Research on tunnel collapse induced by shield tail leakage remains in its infancy. The mechanisms underlying such accidents are not yet fully understood by researchers and engineers, and effective preventive measures have yet to be developed. In this study, a reduced-scale model test was conducted to investigate the processes and mechanisms of tunnel collapse induced by shield tail leakage. The findings reveal that tunnel collapse is primarily triggered by the impact loads generated from the destabilized soil cave. The soil cave, formed due to erosion caused by leakage, propagates upward in a cycle of destabilization and regeneration until the ground surface collapses, resulting in load redistribution around the tunnel. Additionally, the study compares tunnel collapses induced by shield tail leakage and connecting passage leakage, highlighting that while both share similar collapse mechanisms, their boundary conditions differ. The coupling effect between the tunnel structure and surrounding soil is more pronounced in shield tail leakage, leading to more intense load fluctuations and greater structural damage to the tunnel.
中文翻译:
盾构尾部密封系统渗漏引起的隧道坍塌试验研究
随着轨道交通的快速发展,盾构隧道已在全球范围内广泛建设。然而,盾构机尾部的泄漏会导致严重的后果,包括盾构机沉降、隧道结构损坏,甚至灾难性的隧道坍塌。盾构尾部渗漏诱发隧道坍塌的研究仍处于起步阶段。研究人员和工程师尚未完全了解此类事故的机制,尚未开发有效的预防措施。在本研究中,进行了缩小比例模型测试,以研究盾构尾部渗漏诱发隧道坍塌的过程和机制。研究结果表明,隧道坍塌主要是由不稳定的土洞产生的冲击载荷引发的。由于渗漏引起的侵蚀而形成的土洞在不稳定和再生的循环中向上扩展,直到地表坍塌,导致隧道周围的载荷重新分布。此外,该研究还比较了盾构尾部泄漏和连接通道泄漏引起的隧道坍塌,强调虽然两者具有相似的坍塌机制,但它们的边界条件不同。隧道结构与周围土体之间的耦合效应在盾构尾部渗漏中更为明显,导致荷载波动更剧烈,对隧道的结构破坏更大。
更新日期:2025-01-09
中文翻译:
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盾构尾部密封系统渗漏引起的隧道坍塌试验研究
随着轨道交通的快速发展,盾构隧道已在全球范围内广泛建设。然而,盾构机尾部的泄漏会导致严重的后果,包括盾构机沉降、隧道结构损坏,甚至灾难性的隧道坍塌。盾构尾部渗漏诱发隧道坍塌的研究仍处于起步阶段。研究人员和工程师尚未完全了解此类事故的机制,尚未开发有效的预防措施。在本研究中,进行了缩小比例模型测试,以研究盾构尾部渗漏诱发隧道坍塌的过程和机制。研究结果表明,隧道坍塌主要是由不稳定的土洞产生的冲击载荷引发的。由于渗漏引起的侵蚀而形成的土洞在不稳定和再生的循环中向上扩展,直到地表坍塌,导致隧道周围的载荷重新分布。此外,该研究还比较了盾构尾部泄漏和连接通道泄漏引起的隧道坍塌,强调虽然两者具有相似的坍塌机制,但它们的边界条件不同。隧道结构与周围土体之间的耦合效应在盾构尾部渗漏中更为明显,导致荷载波动更剧烈,对隧道的结构破坏更大。