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Experimental investigation on shield-soil interaction during shield posture adjustment in soft ground
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-14 , DOI: 10.1016/j.tust.2025.106386
Hui Jin, Dajun Yuan, Enzhi Wang, Dalong Jin, Xiang Shen

Shield tunneling in soft soil is prone to losing control of posture and seriously deviating from the designed tunnel axis, which can cause significant ground settlement and tunnel misalignment. This paper develops a large-scale indoor shield tunneling model test platform and conducts shield posture adjustment model tests to examine the interaction between the shield and soft soil. Based on these tests, the distribution and evolution of earth pressure and pore water pressure around the shield, as well as the surface displacement under in-situ posture adjustment and tunneling posture adjustment modes are investigated. The results indicate that the earth pressure around the shield and ground displacement are significantly related to the shield tunneling posture mode. When the shield is in the constant posture angle tunneling mode, the sudden changes in earth pressure and ground displacement are mainly due to the in-situ posture adjustment at a large angle before excavation. However, under the subsequent dynamic tunneling effects of the shield shell approaching and leaving the soil in the excavation, the mutation amount gradually dissipates. When the small-range dynamic posture adjustment mode is adopted, the earth pressure around the shield and surface displacement will change synchronously with the shield posture mode and reach their peak value when the posture angle of the shield is maximum. Moreover, there is a plastic limit in the earth pressure around the shield during the posture adjustment, and under the plastic deformation and flow of the soil, the formation will cause soil loss and ground settlement. These findings offer important information on how the shield interacts with the surrounding soil as well as recommendations for constructing shield tunnels in soft soil.

中文翻译:


软土地基盾构姿态调整过程中盾构-土相互作用的试验研究



在软土地体中掘进容易失去姿态控制,严重偏离设计的隧道轴线,从而导致严重的地面沉降和隧道错位。本文开发了大型室内盾构掘进模型测试平台,并进行了盾构姿态调整模型试验,以检验盾构与软土的相互作用。基于这些试验,研究了原位姿态调整和隧道姿态调整模式下盾构周围土压力和孔隙水压力的分布和演变,以及地表位移。结果表明:盾构周围的土压力和地表位移与盾构掘进姿态模式显著相关。当盾构处于恒定姿态角掘进模式时,土压和地表位移的突然变化主要是由于开挖前大角度的原位姿态调整。然而,在随后盾构壳接近和离开开挖土体的动力掘进作用下,突变量逐渐消散。当采用小范围动态姿态调整模式时,盾构周围的土压力和表面位移会随着盾构姿态模式同步变化,并在盾构姿态角最大时达到峰值。而且,在姿态调整过程中,盾构周围的土压存在塑性极限,在土体的塑性变形和流动下,形成会造成土体流失和地面沉降。 这些发现提供了有关盾构如何与周围土壤相互作用的重要信息,以及在软土中建造盾构隧道的建议。
更新日期:2025-01-14
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