考虑主动铰接的小半径曲线盾构掘进分区推力差计算模型及工程应用

Calculation Model of Zonal Thrust Difference for Shield Tunneling in Small-Radius Curves Considering Active Articulation and Its Engineering Application

摘要: 为解决小曲率半径盾构隧道施工中姿态控制及千斤顶推力设定等难题，本文将偏心主动铰接工况引入考虑地层抗力的盾壳–地层三维相互作用分析中，提出了一种改进的分区推力差解析计算方法。结合典型急曲线工程的现场实测数据，证实了所建模型的可靠性。在此基础上，深入探讨了多种因素作用下分区推力差的演变规律。结果表明，主动增大水平铰接角能够非线性地大幅减小千斤顶的非对称推力；土层内摩擦角通过改变地层抗力系数对推力差起全局作用，而水平地层抗力系数则仅在小铰接角阶段产生影响；在软硬不均的复合地层中，掌子面范围内较硬土体的面积占比直接决定了所需分区推力差的大小；同时，辅助开启内侧超挖刀可有效卸载局部地层抗力，显著改善盾壳的空间受力分布以降低转向阻力。研究成果可为极端工况下的主动铰接参数优选与推力精细化配置提供量化支撑，对降低卡盾风险、提升设备智能化导向控制具有实际工程价值。

Abstract: To address the challenges of attitude control and jack thrust setting in small-radius curved shield tunneling, this paper proposes an improved analytical method for calculating the zonal thrust difference by incorporating the eccentric active articulation condition into a 3D shield-ground interaction analysis based on a hyperbolic ground resistance assumption. The reliability of the established model is verified using field measured data from a typical sharp-curve project. Subsequently, the variation laws of the zonal thrust difference under multiple factors are thoroughly investigated. The results indicate that actively increasing the horizontal articulation angle can significantly and nonlinearly reduce the asymmetric jack thrust. The soil internal friction angle globally affects the thrust difference by altering the ground resistance coefficient, whereas the horizontal ground resistance coefficient only exerts influence during the small articulation angle stage. In uneven mixed ground, the area proportion of harder soil at the tunnel face directly determines the required magnitude of the zonal thrust difference. Furthermore, the auxiliary use of the inner overcutting tool effectively unloads local ground resistance, significantly optimizing the spatial load distribution on the shield shell to reduce turning resistance. These findings provide quantitative support for optimizing active articulation parameters and refining thrust configurations under extreme conditions, offering practical engineering value for mitigating shield jamming risks and enhancing intelligent guidance control.