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Tunneling posture of passive articulated EPB shield in soft soil: A multibody mechanical model-based investigation
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-13 , DOI: 10.1016/j.tust.2025.106387
Hui Jin, Dajun Yuan, Enzhi Wang, Dalong Jin, Huixi Liu, Xiang Shen

Shield tunneling in soft soil is prone to lose control of attitude and seriously deviate from the designed tunnel axis, which causes large tunnel deviation and ground settlement. This paper presents an analytical model that describes the behavior and mechanical mechanism of a passive articulated shield tunneling in soft soil. The model formulates multibody mechanics equation that relate the shield movement to its body characteristics, loads acting on the shield, and shield-soil interaction. By using the proposed equation, the pose states of the front and rear parts of the articulated shield can be described. Then, based on the Suzhou Metro Tunnel-Line S1 project, the posture mode and mechanical mechanism of the passive articulated shield under different unit loads and load combinations is revealed by utilizing the proposed model. Furthermore, the validity of the model is confirmed by comparing the calculated results with the field observations. Finally, the sensitivity analysis of the parameters related to the soil, shield and the load acting on the shield has been conducted. The results show that the presence of articulation significantly affects the posture patterns of the front and rear parts of the shield. At the same time, soil characteristics, cutter head weight, segment force, and jack thrust intricately influence the shield posture and create challenges for attitude control in soft soil conditions. This model contributes to a better understanding of the shield behavior and the associated challenges in controlling its posture under such conditions.

中文翻译:


被动铰接式土压平衡式盾构在软土地中的隧道掘进姿态:基于多体力学模型的研究



在软土地体中进行盾构掘进容易失去姿态控制,严重偏离设计隧道轴线,造成隧道跑偏大,地面沉降。本文提出了一个分析模型,描述了被动铰接式盾构在软土中掘进的行为和力学机制。该模型制定了多体力学方程,将盾体运动与其主体特性、作用在盾体上的载荷以及盾体与土壤的相互作用联系起来。通过使用提出的方程,可以描述铰接式盾牌前后部分的姿态。然后,基于苏州地铁隧道S1号线项目,利用所提模型揭示了被动铰接式盾构在不同单元载荷和载荷组合下的姿态模式和力学机构。此外,通过将计算结果与现场观察结果进行比较来确认模型的有效性。最后,对与土壤、盾构和作用在盾构上的载荷相关的参数进行了敏感性分析。结果表明,关节的存在显着影响盾牌前后的姿势模式。同时,土壤特性、刀盘重量、刀片力和千斤顶推力会错综复杂地影响盾构姿态,并为软土条件下的姿态控制带来挑战。该模型有助于更好地了解盾牌的行为以及在这种情况下控制其姿态的相关挑战。
更新日期:2025-01-13
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