基于机-土相互作用的盾构隧道轴线偏差求解与控制

Solution and Control of Shield Tunnel Axis Deviation Based on Shield-strata Interaction

  • 摘要: 为厘清机-土相互作用机理并指导姿态高效控制,基于考虑主动铰接的机-土相互作用模型,提出一种基于增量过程及空间坐标转换的轴线偏差理论计算方法,进而通过纠偏曲线设计与相互作用模型求解油缸推进力合力矩,实现偏差控制。依托福州滨海快线滨中区间进行算例验证,探讨复合地层及主动铰接对实际纠偏轨迹的影响规律,总结相应的偏差控制策略。研究结果表明:基于机-土相互作用及增量过程的方法可准确求解轴线偏差,且主动铰接影响不可忽视;复合地层中,姿态调整可能导致盾构实际纠偏轨迹偏离最优纠偏曲线,且油缸推进力合力矩的非线性分布会显著增加姿态控制难度;主动铰接会导致附加刚体位移分布呈一定非对称性,增大主动铰接角度可有效减小刚体位移;针对复合地层,采用主动铰接协同控制可满足最优纠偏曲线,同时有效减小油缸推进力合力矩,实现偏差高效控制。

     

    Abstract: To elucidate the mechanism of shield-strata interaction and enable accurate attitude control, a theoretical calculation method for axis deviation based on incremental process and spatial coordinate transformation was proposed on the basis of shield-strata interaction model considering active articulation. Furthermore, by designing the deviation correction curve and using the shield-strata interaction model, the propulsion moment was solved to achieve deviation control. The proposed deviation solution and control method were validated through a case study of the BinZhong interval in Fuzhou Binhai Express. The influence of composite strata and active articulation on deviation correction trajectory was carefully studied, and the corresponding control strategy was subsequently summarized. Some conclusions could be drawn as follows. 1) Based on the shield-strata interaction and incremental process, the shield axis deviation can be solved accurately, and the influence of active articulation can not be ignored. 2) In the composite strata, attitude adjustment may cause the actual correction trajectory deviate from the optimal correction curve, and the nonlinear distribution of the propulsion moment will increase the difficulty of attitude control significantly. 3) The existence of active articulated angle leads to a certain asymmetry in the distribution of additional displacement, and increasing active articulation can reduce the additional displacement effectively. 4) For the composite strata, the active articulation cooperative control can not only satisfy the optimal correction curve but also reduce the propulsion moment effectively, thus achieving efficient deviation control. These researches can provide some theoretical support for the prediction and control of axis deviation during shield tunneling, and also provide basis for the subsequent thrust allocation of cylinders.

     

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